IEC TS 62600-200:2013

IEC/TS 62600-200 ®
Edition 1.0 2013-05
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal and other water current converters –
Part 200: Electricity producing tidal energy converters – Power performance
assessment
IEC/TS 62600-200:2013(E)
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IEC/TS 62600-200 ®
Edition 1.0 2013-05
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal and other water current converters –

Part 200: Electricity producing tidal energy converters – Power performance

assessment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 27.140 ISBN 978-2-83220-805-2

– 2 – TS 62600-200 © IEC:2013
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Symbols, units and abbreviations . 12
4.1 Symbols and units . 12
4.2 Abbreviations . 13
5 Site and test conditions . 14
5.1 General . 14
5.2 Bathymetry . 14
5.3 Flow conditions . 14
5.4 TEC test site constraints . 15
5.5 External constraints . 16
6 Tidal energy converter (TEC) description . 16
6.1 General . 16
6.2 Operational parameters . 16
7 Test equipment . 16
7.1 Electric power measurement . 16
7.2 Tidal current measurement . 17
7.3 Data acquisition. 18
8 Measurement procedures . 18
8.1 General . 18
8.2 Operational status . 18
8.3 Data collection . 19
8.4 Instrument calibration . 19
8.5 Data processing . 19
8.6 Averaging . 20
8.7 Test data properties . 20
8.8 Electric power measurement . 20
8.8.1 Output terminals of the TEC . 20
8.8.2 The power measurement location . 21
8.8.3 Remote TEC sub-systems . 21
8.8.4 Power measurements . 21
8.9 Incident resource measurement . 21
8.9.1 Current profiler placement relative to TEC . 21
8.9.2 Contribution from turbulence. 25
8.9.3 Contribution from waves . 25
9 Derived results . 26
9.1 General . 26
9.1.1 Introductory remarks . 26
9.1.2 Water density . 26
9.2 Data processing . 26
9.2.1 Filtering . 26
9.2.2 Exclusion . 26
9.2.3 Correction . 26
9.3 Calculation of the power curve . 26

TS 62600-200 © IEC:2013 – 3 –
9.3.1 Method of bins . 26
9.3.2 Detailed description of method of bins . 27
9.3.3 Interpolation . 30
9.3.4 Extrapolation . 30
9.3.5 Uncertainty calculation . 30
9.4 Mean tidal current velocity vertical shear profile . 30
9.5 RMS fluctuating tidal current velocity . 31
9.6 Tidal ellipse at hub height . 32
9.7 Calculation of the TEC overall efficiency . 33
9.8 TEC annual energy production (TEC AEP) . 33
10 Reporting format . 34
10.1 General . 34
10.2 TEC report . 34
10.3 TEC test site report . 34
10.4 Electrical grid and load report . 37
10.5 Test equipment report . 37
10.6 Measurement procedure report . 38
10.7 Presentation of measured data . 38
10.8 Presentation of the power curve . 40
10.9 Presentation of the TEC overall efficiency . 43
10.10 Uncertainty assumptions . 44
10.11 Deviations from the procedure . 44
Annex A (normative) Categories of error . 45
Annex B (informative) Uncertainty case study . 47
Annex C (informative) Calculation of TEC annual energy production . 48
Annex D (informative) Wave measurement . 51

Figure 1 – Equivalent diameter calculations for various TEC projected capture areas . 9
Figure 2 – Orientation A for current profiler deployment (plan view) . 23
Figure 3 – Orientation A for current profiler deployment (section view) . 23
Figure 4 – Orientation B for current profiler deployment (plan view) . 24
Figure 5 – Orientation B for current profiler deployment (section view) . 24
Figure 6 – Orientation for floating TEC current profiler deployment (plan view) . 25
Figure 7 – The vertical variation of tidal current across the projected capture area . 28
Figure 8 – Example tidal ellipse plot identifying principal ebb and flood directions . 36
Figure 9 – Example plot of the channel cross-sectional area consumed by the TEC on
plane perpendicular to principal flow direction (plan and section view) . 37
Figure 10 – Example scatter plot of performance data . 38
Figure 11 – Example plot of the mean tidal current velocity vertical shear (mean
velocity shear) profile . 39
Figure 12 – Example presentation of the power curve . 41
Figure 13 – Example presentation of the power curve with uncertainty bars . 42
Figure 14 – Example presentation of the power curve showing excluded data points . 42
Figure 15 – Example presentation of the TEC overall efficiency curve . 44

Table 1 – Example presentation of the mean tidal current velocity vertical shear (mean
velocity shear) data . 39

– 4 – TS 62600-200 © IEC:2013
Table 2 – Example presentation of the RMS fluctuating tidal current velocity at hub
height . 40
Table 3 – Example presentation of the power curve data . 41
Table 4 – Example presentation of the TEC overall efficiency . 43
Table A.1 – List of uncertainty parameters to be included in the uncertainty analysis . 45
Table C.1 – Example presentation of annual energy production (flood tide shown) . 50

TS 62600-200 © IEC:2013 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARINE ENERGY –
WAVE, TIDAL AND OTHER WATER CURRENT CONVERTERS –

Part 200: Electricity producing tidal energy converters –
Power performance assessment
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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The main task of IEC technical committees is to prepare International Standards. In
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specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62600-200, which is a technical specification, has been prepared by IEC technical
committee TC 114: Marine energy – Wave, tidal and other water current converters.
The text of this technical specification is based on the following documents:

– 6 – TS 62600-200 © IEC:2013
Enquiry draft Report on voting
114/93/DTS 114/101A/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 62600 series, under the general title Marine energy – Wave, tidal and
other water current converters , can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International Standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
TS 62600-200 © IEC:2013 – 7 –
MARINE ENERGY –
WAVE, TIDAL AND OTHER WATER CURRENT CONVERTERS –

Part 200: Electricity producing tidal energy converters –
Power performance assessment
1 Scope
This Technical Specification provides:
• a systematic methodology for evaluating the power performance of tidal current energy
converters (TECs) that produce electricity for utility scale and localized grids;
• a definition of TEC rated power and rated water velocity;
• a methodology for the production of the power curves for the TECs in consideration;
• a framework for the reporting of results.
Exclusions from the scope of this Technical Specification are as follows:
• tidal energy converters (TECs) that provide forms of energy other than electrical energy
unless the other form is an intermediary step that is converted into electricity by the TEC;
• resource assessment. This will be carried out in the tidal energy resource characterization
and assessment Technical Specification (future IEC/TS 62600-201);
• scaling of any measured or derived results;
• power quality issues;
• any type of performance other than power and energy performance;
• the combined effect of multiple TEC arrays.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60688:2012, Electrical measuring transducers for converting AC and DC electrical
quantities to analogue or digital signals
IEC 61400-12-1:2005, Wind turbines – Part 12-1: Power performance measurements of
electricity producing wind turbines
IEC 61869-2:2012, Instrument transformers – Part 2: Additional requirements for current
transformers
IEC 61869-3:2011, Instrument transformers – Part 3: Additional requirements for inductive
voltage transformers
IEC/TS 62600-1, Marine energy – Wave, tidal and other water current converters – Part 1:
Terminology
ISO/IEC 17025:2005, General requirements for the competence of testing and calibration
laboratories
– 8 – TS 62600-200 © IEC:2013
ISO/IEC Guide 98-3:2008, Uncertainty of measurement – Part 3: Guide to the expression of
uncertainty in measurement (GUM:1995)
International Hydrographic Organisation: 2008, IHO standards for hydrographic surveys,
Special publication No. 44. 5th edition (http://www.iho-ohi.net/iho_pubs/standard/S-
44_5E.pdf)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. General terms
and definitions regarding marine energy found in IEC 62600-1 also apply.
3.1
acoustic current profiler
an instrument that produces a record of water current velocities for specified depth and time
intervals over a pre-determined distance through the water column
Note 1 to entry: Current profilers can be configured in many ways: downward facing, mounted on boats or
moorings, installed on the seabed facing upwards, or mounted on a TEC oriented in any direction desired for tidal
current and wave studies. Detailed specifications for the use of acoustic current profilers are provided in this
technical specification.
3.2
averaging period
the period of time, in minutes, over which data samples are averaged to calculate a data point
3.3
current profiler bin
a distance interval, typically vertically on the order of 1 m or less, that is used to group data
samples and data points for calculation of certain parameters according to their corresponding
distance above the seabed or below the surface
���������
Note 1 to entry: Mean current velocity, Ushear , is an example of a parameter that is grouped by current profiler
i,k,n
bins.
3.4
cut-in water velocity
water speed during the accelerating part of the tidal cycle, above which there is power
production
3.5
cut-out water velocity
the maximum flow speed above which the TEC cannot continue operation
3.6
data point
a single measurement used to populate bins and obtained from averaging instantaneous data
samples over the specified averaging period
Note 1 to entry: U , P and Q are all examples of data points.
i,n i,n i,n
3.7
data sample
a single measurement obtained at a minimum sampling frequency of 1 Hz used in the
subsequent calculation of a data point
Note 1 to entry: U , P and Q are all examples of data samples. A data sample may consist of one or
i,j,k,n i,j,n i,j,n
multiple current profiler 'pings' depending on the setting of the device.

TS 62600-200 © IEC:2013 – 9 –
3.8
data set
the collection of data points calculated during a specific portion of the test period, and is a
subset of the test data
Note 1 to entry: For example, all data points collected during a flood tide would be considered a data set.
3.9
energy extraction plane
the plane that is perpendicular to the principal axis of energy capture where device rotation or
energy conversion nominally occurs
Note 1 to entry: Refer to Figures 2 and 3 for a simplified illustration of the energy extraction plane. For devices
with multiple extraction planes, an appropriate upstream energy extraction plane on both ebb and flood tides
should be identified.
3.10
equivalent diameter
a common method used to transform a TEC that is non-circular in cross-section, where the
cross-section is parallel to the energy extraction plane, into an equivalent device with a
circular cross-section
4A
D = �
E
p
where:
A is the projected capture area
Note 1 to entry: Examples of the calculation of equivalent diameter for various TEC projected capture areas are
provided in Figure 1.
IEC  975/13
Figure 1 – Equivalent diameter calculations for various TEC projected capture areas
3.11
free-stream condition
boundary condition description for a TEC operating in a sufficiently large channel and without
external influence such that its performance is equivalent to a TEC operating in a channel
having a cross-section of infinite width and depth
3.12
hub height
distance from the centroid of the TEC projected capture area to the sea floor
3.13
low cut-out water velocity
water velocity during the decelerating part of the tidal cycle below which a TEC does not
produce power
– 10 – TS 62600-200 © IEC:2013
3.14
method of bins
a method of data reduction that groups test data for a certain parameter into sub-sets typified
by an independent underlying variable that can be applied both spatially (current profiler bins)
and by tidal current speed (velocity bins)
3.15
net electrical power output
the net active power at the output terminals, excluding any power generated by on-board
ancillary generators or imported via separate cables
Note 1 to entry: Additional information on this term is provided in 8.8.4.
3.16
power weighted velocity
mean velocity derived with a power weighted (velocity cubed weighted) function to ensure that
it is representative of the value of the incident power across the projected capture area as a
standard mean of the velocity would underestimate the incident power
Note 1 to entry: A more specific definition can be found in formula (1).
3.17
principal axis of energy capture
an axis parallel to the design orientation or heading of a TEC passing through the centroid of
the projected capture area
Note 1 to entry: Refer to Figure 2 for a simplified example of the principal axis of energy capture.
3.18
principal flow direction
the primary orientation or heading of the tidal current
Note 1 to entry: The primary flow directions for flood and ebb tides are nominally 180° apart; however, the exact
difference between these two directions is determined by site specific factors, such as bathymetry.
Note 2 to entry: Refer to Figure 2 for a simplified example of the principal flow directions.
3.19
projected capture area
the frontal area of the TEC, or swept area in the case of an oscillating TEC, including the duct
or other structures which contribute to the power extracted by the device perpendicular to the
principal axis of energy capture
Note 1 to entry: If the upstream and downstream areas of the device are different, the larger area should be used
in the calculation of η .
System,i
Note 2 to entry: The definition of projected capture area is further clarified in Figure 7.
3.20
rated water velocity
the lowest mean flow speed at which the TEC rated power is delivered to its output terminals
Note 1 to entry: Different rated water velocities may result for ebb and flood conditions depending on device
design.
3.21
r.m.s. fluctuating velocity
the root-mean square of the current speed variations in each current profiler bin
Note 1 to entry: Additional details can be found in 9.5.

TS 62600-200 © IEC:2013 – 11 –
3.22
shear profile
the vertical variation of the mean current velocity across all measured current profiler bins
3.23
TEC annual energy production
an estimate of the total energy production of a TEC during a one-year period obtained by
applying the measured flood and ebb power curves to a set of tidal current predictions, at a
stated test availability
3.24
TEC footprint
the area described by the intersection of the energy extraction plane and the principal axis of
energy capture for a floating TEC that is free to move on a compliant mooring
Note 1 to entry: Refer to Figure 6 for further details and an illustration on TEC footprint.
3.25
TEC output terminals
the node of a TEC power generation circuit where the output is available as an AC signal at
the grid network frequency
Note 1 to entry: In the case of a DC output TEC, the output terminals are defined as the node where output power
is available for battery charging or connection directly to the load.
Note 2 to entry: A full description of output terminal for both AC and DC cases is provided in 8.8.1.
3.26
TEC overall efficiency
ratio of the net power produced by the TEC at its output terminals to the power of an
undisturbed flow of water with the same projected capture area as the TEC
3.27
TEC rated power
the maximum continuous electrical power measured at the TEC output terminals which the
TEC is designed to achieve under normal operating conditions
3.28
TEC test site
the location of the TEC under test and the surrounding area
Note 1 to entry: A full description of TEC test site requirements is provided in Clause 5.
3.29
test availability
the ratio of the total number of hours during a test period where all test conditions are met, to
the total number of hours of the test period
3.30
test data
all data points collected during the test period
3.31
test period
the period between first data collection and last data collection, for the purpose of TEC power
performance assessment
Note 1 to entry: Refer to 8.3 for additional information.

– 12 – TS 62600-200 © IEC:2013
3.32
tidal ellipse
a graphical representation of a tidal current in which the velocity of the current at different
hours of the tidal cycle is represented by radial vectors and angles
Note 1 to entry: A line joining the extremities of the vectors will form a curve roughly approximating an ellipse.
3.33
tidal energy converter
any device which transforms the kinetic energy of tidal currents into electrical energy
3.34
velocity bin
a velocity magnitude interval, typically in the order of 0,1 m/s or less, that is used to group
data samples and data points for calculation of certain parameters according to their
corresponding velocity value
Note 1 to entry: Total instantaneous active electrical power, P is an example of a parameter that is grouped
i,j,n,
by velocity bins.
4 Symbols, units and abbreviations
NOTE SI units are assumed for all terms in this technical specification unless otherwise noted.
4.1 Symbols and units
A Projected capture area of the TEC [m ]
A Area of current profiler bin k across the projected capture area [m ]
k
Equivalent diameter [m]
D
E
η TEC overall efficiency
System
η TEC overall efficiency in velocity bin i
System,i
h Vertical dimension of the projected capture area [m]
Index number defining the velocity bin
i
j Index number of the time instant at which the measurement is
performed
k Index number of the current profiler bin across the projected capture
area
L Number of samples in the defined averaging period which produces
data point n
n Index number defining an individual data point in a velocity bin
N Number of measurement data bins
B
N Number of data points in velocity bin i
i
N Number of data points in current profiler bin k
k
�
Mean recorded TEC active power in velocity bin i [W]
P
i
�
P Mean recorded TEC active power in velocity bin i for data point n [W]
i,n
P Magnitude of the total instantaneous active electrical power from the [W]
i,j,n
TEC
�
Q Mean recorded TEC reactive power in velocity bin i [VAr]
i
�
Q Mean recorded TEC reactive power in velocity bin i for data point n [VAr]
i,n
Q Magnitude of the total instantaneous reactive electrical power from the [VAr]
i,j,n
TEC
TS 62600-200 © IEC:2013 – 13 –
R Radius [m]
Total number of current profiler bins across the projected capture area,
S
normal to the principal axis of energy capture
Time zone shift relative to UTC [h]
T
�
U Mean power weighted tidal current velocity in velocity bin i [m/s]
i
�
U Mean power weighted tidal current velocity in velocity bin i for data [m/s]
i,n
point n
�
Instantaneous power weighted tidal current velocity across the [m/s]
U
i,j,n
projected capture area
U Magnitude of instantaneous tidal current velocity, time j, at current [m/s]
i,j,k,n
profiler bin k, in velocity bin i, for data point n
�����������
Mean tidal current velocity in velocity bin i, for current profiler bin k at [m/s]
Uellıpse
i,k,n
hub-height, for data point n
[m/s]
Urms RMS fluctuating tidal current velocity in velocity bin i at current profiler
i,k
bin k
Urms RMS fluctuating tidal current velocity in velocity bin i, at current profiler [m/s]
i,k,n
bin k, for data point n
���������
[m/s]
Ushear Mean tidal current velocity in velocity bin i at current profiler bin k
i,k
���������
[m/s]
Ushear Mean tidal current velocity in velocity bin i, at current profiler bin k, for
i,k,n
data point n
w Horizontal dimension of the projected capture area [m]
Density of water [kg/m ]
ρ
�
Mean tidal current direction in velocity bin i, at current profiler bin k, for [deg]
θ
i,k,n
data point n
θ Magnitude of the instantaneous tidal current direction, time j, at current [deg]
i,j,k,n
profiler bin k, in velocity bin i, for data point n
4.2 Abbreviations
AC Alternating Current
AEP Annual Energy Production
CD Committee Draft
CT Current Transformer
DAQ Data Acquisition System
DC Direct Current
EXT Extrapolated
GPS Global Positioning System
HAT Highest Astronomical Tide
HV High Voltage
IEC International Electrotechnical Commission
IHO International Hydrographic Organisation (Monaco)
INT Interpolated
ISO International Standards Organization
LAT Lowest Astronomical Tide
LV Low Voltage
MHW Mean High Water
MLW Mean Low Water
– 14 – TS 62600-200 © IEC:2013
PPT Parts per Thousand
RMS Root Mean Square
SI International System of Units
TC Technical Committee
TEC(s) Tidal Energy Converter(s)
TEOS-10 The Thermodynamic Equation of Seawater – 2010
TS Technical Specification
UTC Coordinated Universal Time
UTM Universal Transverse Mercator
VT Voltage Transformer
WGS84 World Geodetic System 1984
5 Site and test conditions
5.1 General
The TEC test site should be characterized in detail and reported prior to any assessment of
power performance. Specifically, the bathymetry and flow conditions should be clearly
identified. Guidance for satisfying the reporting requirements specified in 10.3 are described
in this clause.
5.2 Bathymetry
The bathymetry of the TEC test site should be surveyed to ensure that it is free from
obstacles and topography that could affect the performance of the TEC or the local quality of
the tidal currents. A portion of the TEC test site, 10 equivalent diameters upstream and
downstream of, and 5 equivalent diameters on either side of, the TEC location (an area with
dimensions 20 × 10 equivalent diameters), should be surveyed in accordance with IHO Order
1a hydrographic survey standard. This survey is described in Chapter 1, and summarized in
Table 1, of the IHO Standards for Hydrographic Surveys: 2008.
An analysis of the bathymetric survey of the aforementioned portion of the TEC test site
should be conducted to clearly identify features of the local topography. Any significant
variation in the local bathymetry should be clearly identified and characterized. There should
be no local bathymetric disturbances present that could lead to a serious local variation in the
quality and reliability of the incident resource, and thus, a misrepresentation of the TEC power
performance.
5.3 Flow conditions
It is necessary to categorize the flow conditions at the TEC test site before any power
performance assessment can be made. Guidance is provided here for the assessment of
specific ambient flow conditions, i.e. principal flow directions, and this assessment should be
completed in accordance with the description outlined below. The following parameters should
be reported:
• tidal ellipse at the energy extraction plane centreline;
• predominant direction of flood tide streamlines (i.e. principal flood flow direction);
• predominant direction of ebb tide streamlines (i.e. principal ebb flow direction).
Procedures for calculating the predominant ebb and flood streamline directions are provided
in 9.6 and a sample reporting diagram is provided in Figure 8 in 10.3. To position current
profilers appropriately, the average principal ebb and flood flow directions should be
calculated by the method of least squares.

TS 62600-200 © IEC:2013 – 15 –
The principal flow direction should be determined using one of the following methods; all
measurements should take place over at least one full flood tide and one full ebb tide:
• a prediction of the flow direction at the TEC location from resource assessment modelling.
This should be corroborated by the current profiler measurements taken during the test
period or another of the methods detailed herein;
• a deployment of a bottom mounted current profiler at the TEC location, preferably prior to
the deployment of the TEC for power performance assessment. The flow direction should
be corroborated by the current profiler measurements taken during the test period or
another of the methods detailed herein;
• a boat or bottom mounted current profiler deployment at the TEC location, preferably prior
to the deployment of the TEC for power performance assessment, using a calibrated
gyroscope as a heading input;
• should the TEC device be in position before these tests then measurements should take
place on the upstream side of the TEC on both ebb and flood tides. Measurements should
take place over at least one full ebb tide and one full flood tide.
Great care should be taken when measuring flow direction from bottom mounted current
profilers using internal flux gate compasses as the heading input. The following precautions
should be taken during calibration and deployment:
• it is advisable to use non-ferrous mounting frames and fittings;
• the compass calibration should take place in the deployment frame away from all magnetic
influence;
• the calibration of the compass should include a cross-check of the heading of the current
profiler against a known magnetic north;
• if divers are used to deploy the current profiler then they should measure the orientation of
the current profiler once on the seabed with a precision compass.
NOTE None of these precautions guard against additional magnetic influences at the deployed location, the use
of a calibrated gyroscope input avoids these magnetic effects.
Corroboration of resource assessment model predictions with measured quantities should not
be done using data that was collected to develop, validate or tune the resource model.
5.4 TEC test site constraints
TEC performance assessment may be affected by a variety of external influences which need
to be mitigated. The TEC test site, therefore, should be representative of the final deployment
environment and bathymetry, with the following constraints:
• the TEC test site should be free from any performance enhancing features (i.e. objects or
terrain that deflect flow to create local increases in the incident resource) which are not
representative of typical operating conditions and/or deployment site(s);
• unrepresentative TEC performance may be observed when the size of the TEC relative to
the cross-sectional area of the TEC test site prevents flow from diverting around the
device as would naturally occur in free-stream conditions. The TEC test site cross-
sectional area should therefore be representative of a typical deployment site. A diagram
illustrating the proportion of channel cross-sectional area consumed by the projected area
of the TEC and supporting structure (including foundations) onto the plane perpendicular
to the principal flow direction should be provided (example provided in Figure 9 in 10.3).
Data should be provided for both MLW and MHW, or LAT and HAT, conditions.
Dimensions should be provided for the hub height distance above the seabed and below
the free surface, and the proximity to any fixed boundaries should be reported. In
instances where the principal flow direction varies on the ebb and flood tide, and as a
result the projected area, a diagram for each direction should be provided.
NOTE In the event the TEC is located in a very large channel or open waterway, a suitable upper limit of channel
cross-sectional area presented in the diagram is 200 times the combined projected area of the TEC capture area
and supporting structure at low tide conditions.

– 16 – TS 62600-200 © IEC:2013
5.5 External constraints
Additional external constraints may further affect the appropriate performance assessment of
a TEC. Continuous operation of a TEC during the test period is strongly preferred and any
external constraints that may prevent TEC operation should be identified during test planning
and reported clearly. It is also necessary to enumerate the external constraints that may limit
the ability to satisfy the data collection requirements, as given in 8.3. Additional constraints
should be addressed and summarized as appropriate given the individual TEC test site.
Potential constraints may include, but are not limited to:
• regulatory limitations;
• electric grid conditions;
• permitting limitations;
• adverse sea state;
• inclement weather.
6 Tidal energy converter (TEC) description
6.1 General
A general description and diagram of the TEC is required. Specifically, a description of the
system, including components, subsystems and a method of operation for the TEC, as well as
a description of the expected operating envelope are required. Procedures for satisfying the
reporting requirements specified in 10.2 are described in 6.2.
6.2 Operational parameters
As well as a detailed description of the device system and operation method, given in 10.2,
the following parameters should be reported:
• rated TEC output power;
• rated water velocity;
• equivalent diameter;
• cut-in water velocity to begin power production;
• low cut-out water velocity to end power production (if different than the cut-in water
velocity);
• cut-o
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