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Individual Phase Full-Power Testing Method for High-Power STATCOM

State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment, State Grid Hunan Electric Company Limited Disaster Prevention and Reduction Center, Changsha 410129, China
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Electronics 2019, 8(7), 754; https://doi.org/10.3390/electronics8070754
Received: 28 May 2019 / Revised: 27 June 2019 / Accepted: 29 June 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Power Converters in Power Electronics)
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Abstract

For a high-power static synchronous compensator (STATCOM), a full-power pre-operation test in the factory is necessary to ensure the product quality of a newly manufactured one. But owing to the hardware limitation and cost of test platform, such test is currently too difficult to conduct in the factory, thus it poses great risk to the on-site operation and commissioning. To address this issue, this paper proposes an individual phase full-power testing method for STATCOM. By changing the port connection, three-phase STATCOM was reconstructed into a structure that two phases are in parallel and then in series with the third-phase, and then connected to two phases of the rated voltage grid. Then by rationally matching the voltage and current of three phases, the parallel phases can get a reactive current hedging under both the rated voltage and rated current, meanwhile three phases maintain their active power balance. As a result, STATCOM gets a phase full-power tested phase by phase. The simulation results in Matlab/Simulink show that, under the proposed test system, both the voltage and current of the parallel two phases get their rated values while the grid current is only about 3% of the rated current, meanwhile the DC-link voltage of each phase converter is stabilized. Compared with other testing methods for STATCOM, this method requires neither extra hardware nor high-capacity power supply to construct the test platform, but it can simultaneously examine both the entire main circuit and a large part of the control system in STATCOM. Therefore, it provides a cost-effective engineering method for the factory test of high-power STATCOM. View Full-Text
Keywords: full-power testing; high-power; individual phase; operation test; static synchronous compensator (STATCOM) full-power testing; high-power; individual phase; operation test; static synchronous compensator (STATCOM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Huang, Q.; Li, B.; Tan, Y.; Mao, X.; Zhu, S.; Zhu, Y. Individual Phase Full-Power Testing Method for High-Power STATCOM. Electronics 2019, 8, 754.

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