Description of PD IEC TS 62600-30:2018 2018

This part of IEC 62600 includes:

• definition and specification of the quantities to be determined for characterizing the power quality of a marine energy (wave, tidal and other water current) converter unit;

• measurement procedures for quantifying the characteristics of a marine energy (wave, tidal and other water current) converter.

The measurement procedures are valid for a single marine energy converter (MEC) unit (or farm) with three-phase grid or an off-grid connection. The measurement procedures are valid for any size of MEC unit, though this document only requires MEC unit types intended for PCC (Point of Common Coupling) at Medium Voltage (MV) or High Voltage (HV) to be tested and characterized. In addition, a simplified measurement and reporting procedure is outlined for MEC units connected at Low Voltage (LV) networks. MV–connected and LV-connected devices are defined as:

• MV connected units – typically multiple three-phase MEC units operating as a marine power farm and delivering power through a HV or MV network;

• LV connected units – typically single-phase or three-phase units deployed in isolated, hybrid or micro-grid type systems supplying small-scale loads.

Considering the nascent status of the marine energy sector, the following limitations of this document are to be recognized:

• voltage fluctuations under switching operation – the current revision only considers voltage fluctuations under continuous operation;

• resource classifications – to categorize the measured flicker quantities, various resource classes are suggested only as guidelines. The user is advised to use these resource classes judiciously.

The measurement procedures are designed to be as non-site-specific as possible so that power quality characteristics measured at a test site, for example, can be considered valid at other sites also providing the same MEC unit configuration and operation modes (for example control parameters). If the configuration or operation mode is changed in any way that might cause the MEC unit to behave differently with respect to power quality, the power quality measurement procedures must be repeated.

This document is for testing of wave, tidal and other water current energy converter units, though it contains information that may also be useful for testing of MEC farms. The cases described are not intended for Ocean Thermal Energy Conversion (OTEC) systems.

NOTE This document uses the following terms for system voltage:

• low voltage (LV) refers to U_n <= 1 kV;

• medium voltage (MV) refers to 1 kV < U_n <= 35 kV;

• high voltage (HV) refers to U_n > 35 kV.

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