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.
Highlights
Static synchronous compensator (STATCOM) is an effective solution for fast voltage/reactive power support during normal and faulty conditions [1,2]
Three-phase STATCOM was reconstructed into a structure that two phases are in parallel and series with the third-phase
To address the factory test of high power STATCOM, a phase full-power testing method is present in this paper
Summary
Static synchronous compensator (STATCOM) is an effective solution for fast voltage/reactive power support during normal and faulty conditions [1,2]. For the testing of STATCOM value, the common method is to employ two submodules to form a back-to-back test platform [24,25] It can check the converter adequacy with regard to current, voltage, and temperature stresses in various operation conditions. One is operated as test object to output the rated reactive current, while the other is used as an accompanying device to output the opposite reactive current to neutralize the former, thereby maintaining the tiny total grid current It can test the actual performance of the whole STATCOM, but requires an extra STATCOM besides the tested one, resulting in very high cost and poor utilization. A math simulation was carried out in Matlab, and the results show system that can stably operate under the proposed and current, realize a phase full-power test.STATCOM. Simulation results show that STATCOM can stably operate under the proposed system
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