IEC EN 62751-1 Power Losses in Voltage Source Converter (VSC) Valves for High Voltage Direct Current (HVDC) Systems - Part 1: General Requirements

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 62751-1 test. This standard standardizes the method for calculating HVDC converter station losses by summing the calculated losses for each element of equipment. The standardized calculation method will help the buyer compare competitive offers in a meaningful way. It will also allow easy creation of performance curves for a wide range of operating conditions where performance needs to be known.

In the absence of an inexpensive and accurate experimental method that can be used to objectively verify losses during type tests, the calculation method is the next best alternative, as it uses experimental data, wherever possible, from measurements on individual equipment and components listed below.

Worst possible combination of ac when calculating power losses to determine worst-case ratings of individual components or equipment (e.g. cooling plant). network conditions, ambient conditions and real/reactive power (including overload) will be taken into account.

When calculating power losses for contractual loss guarantees, ac grid conditions, ambient conditions and real/reactive power are made so that offers from different manufacturers can be compared equally. Buyers of HVDC systems are required to determine the atmospheric pressure, ambient temperature, humidity, coolant temperature, power transmission level, etc., at which power losses will be determined. may specify its own standard reference conditions for

In some special cases it may be possible to arrange a temporary test connection, for example, where two converters are powered from the same ac. In this context, the ac source is equal to the losses in the circuit. However, this method requires additional instrument transformers and switchgear and is only possible when there are two identical converters connected to the same AC system at the same location. Once again, there are practical measurement challenges. It is also possible to set up on-site direct thermal measurement of valve losses by measuring the temperature rise of the valve coolant; however, this method does not capture all sources of power loss in the valve, and the accuracy typically achievable with field-mounted flow and temperature sensors is relatively poor. Another alternative is to make a thermal or electrical measurement of the losses in the valve during type testing, but this method is also difficult to perform with sufficient accuracy because the voltage and current waveforms experienced by the test object are not the same as those experienced during actual testing.

EUROLAB assists manufacturers with IEC EN 62751-1 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.