High-capacity voltage source converter twin trawling test platform and test method

Abstract

The invention provides a high-capacity voltage source converter twin trawling test platform and test method. The high-capacity voltage source converter twin trawling test platform comprises a test power supply US, a circuit breaker QF1, a voltage regulator TY, a transformer TF, a circuit breaker QF2 and a test converter TO, the test power supply US, the circuit breaker QF1, the voltage regulator TY, the transformer TF and the circuit breaker QF2 are sequentially connected in series; the output end of the circuit breaker QF2 is connected with the test current transformer TO; the test object converter TO comprises N ports with different voltage and power levels. The method is realized by changing a control strategy and performing primary wiring modification, and an extra converter device does not need to be tested; the output voltage of the transformer can be adjusted through the voltage regulator, so that connection with grid-connected ports of converters with different voltage levels is realized, and the adaptability is high; the method is not limited by the number and capacity of converter ports, and is high in flexibility.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a large-capacity voltage source converter pair-to-drag test platform and a test method. Background technique [0002] With the continuous advancement of power semiconductor technology, the voltage source converter-based flexible direct current transmission (VSC-HVDC) technology has become a new type of power transmission system recently developed, which uses pulse width modulation technology to directly invert the direct current voltage into The AC voltage with controllable amplitude and phase does not need to be commutated by the voltage of the receiving end grid, and there is no limit to the system capacity of the receiving end grid. It can be used to connect small isolated systems to the main grid. VSC-HVDC can independently and quickly control the transmitted active power and reactive power, thus greatly enhancing the flexibility of power transmission, and ...

AI Technical Summary

Problems solved by technology

The direct test method has high requirements on the power supply and equipment capacity of the laboratory, and with the continuous increase of the converter capacity, it is difficult to realize in the laboratory environment; the back-to-back to tow test method has lower requirements on the power supply capacity, but additional To build a set of voltage source converters of the same capacity level as a test device, the cost and floor area are relatively high

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