The invention discloses a circuit and a method for measuring stray inductance of a current conversion circuit of a three-level converter. The circuit comprises a first IGBT (insulated gate bipolar transistor), a second IGBT, a third IGBT, a fourth IBGT, a first clamp diode, a second clamp diode, a first resonant capacitor, a second resonant capacitor, a first direct-current support capacitor, a second direct-current support capacitor, a laminated busbar, a direct-current power supply and a freewheel reactor. The method includes forming different freewheel circuits by the freewheel reactor; exerting double pulses to each corresponding IGBT; taking an average value of resonance current frequencies at a turn-on moment and a turn-off moment; and precisely computing the stray inductance of the current conversion circuit by an LC parallel resonance characteristic realized by the resonant capacitors and the stray inductance of the circuit. The circuit and the method have the advantages that actual operation is facilitated, the stray inductance of the current conversion circuit of the three-level converter can be accurately measured, overvoltage levels of a power device under different current grades of the three-level converter can be accurately controlled conveniently, and accordingly establishment of a system control strategy can be guided.

Circuit and method for measuring stray inductance of current conversion circuit of three-level converter

The invention relates to a high-voltage STATCOM commutation chain equivalent full-voltage and full-power operation control method. The commutation chain comprises two bridge arms. Each bridge arm is formed by serially connecting a plurality of commutation chains. The two bridge arms are connected through an electric reactor. Based on the main circuit topology, the method of the invention can be used to control a plurality of commutation chains to be operated in the full-voltage and full-power working condition at the same time, so on one hand, the disadvantage that a high-voltage STATCOM device is hard to undergo full-voltage and full-power tests in the experimental environment can be overcome, and on the other hand, compared with other equivalent operation test methods, the sub-module equivalent full-voltage and full-power test efficiency can be greatly improved.

High-voltage STATCOM commutation chain equivalent full-voltage and full-power operation control method

The invention relates to an operation testing device for a voltage source type converter sub-module and an operation testing method thereof. A sub-module operation testing device comprises a charging power supply E, an auxiliary switch K, an auxiliary module, a sample module and a load electric reactor L, wherein the two ends of the auxiliary switch K are respectively connected with the charging power supply E and the auxiliary module; the two ends of the load electric reactor L are respectively connected with the auxiliary module and the sample module; and a capacitor Cs1 of the charging power supply E and a lower bridge arm V3 of the auxiliary module as well as a capacitor Cs2 of the charging power supply E and a lower bridge arm V4 of the sample module are grounded. According to the scheme, voltage, current and thermal stress of the sub-module under an actual working condition can be equivalent to one another so as to provide a brand new technical means for a test of a third-generation voltage source converter (VSC) sub-module and a brand new path for practical application.

Operation testing device for voltage source type converter sub-module and testing method thereof

The invention provides a cascade converter sub-module single-phase test circuit based on a symmetrical bridge arm structure. The cascade converter sub-module single-phase test circuit comprises a current generator and two groups of test bridge arms with the same structure, and the current generator provides a test current for the test bridge arms; the two groups of test bridge arms comprise a plurality of tested sub-modules which are connected in series, and the two groups of test bridge arms are in a reverse series connection structure. According to the invention, working condition simulationof a plurality of sub-modules of the cascaded converter in rectification and inversion operation modes can be achieved, simultaneous test of the plurality of sub-modules can be achieved, and the testefficiency is greatly improved. In addition, the structure of reverse series connection between the test bridge arms can counteract the direct current component in the capacitor voltage, and the power supply requirement of the current generator is reduced.

Cascade converter sub-module single-phase test circuit based on symmetrical bridge arm structure

The invention relates to a test circuit (20) for a high-power semiconductor element (11) in power converters for high-voltage direct-current power transmission, said circuit comprising: a high-voltage circuit (22) with a terminal (31) for the high-power semiconductor element (11); and a high-voltage source (28) that can be connected to the high-power semiconductor element (11). The test circuit is intended to allow a particularly flexible setting of test conditions and to function in particular independently of the mains frequency. To achieve this, the high-voltage source (28) comprises a plurality of voltage-controlled power converter modules (16) connected in a first series (29).

Test circuit for a high-power semiconductor element

Testing device for operation of current changing chain and control method

The utility model discloses a cascaded converter service test device and control method thereof The cascaded converter service test device comprises two cascaded converters, and electric reactors are arranged between midpoint of each cascaded converter and upwards-connected chain linked modules, and between midpoint of each cascaded converter and downwards-connected chain linked modules The midpoint of a cascaded converter is connected with one end of a single-phase system through a soft starting circuit, while the midpoint of the other cascaded converter is connected with the other end of the single-phase system The two cascaded converters charged by the single-phase system, invert outputs of the two cascaded converters are started at the same time and the output currents are gradually increased until the two cascaded converters all reach test condition so as to enable one cascaded converter to work in a capacitive output state while the other cascaded converter works in an inductive output state It can be judged by a test of such structure whether cascaded converters are capable of normal operation under various working condition and satisfy designed capacity and overload capability The simple circuit of the cascaded converter service test device can be detected by the cascaded converters themselves so that extra dedicated testing components are prevented

A cascaded converter service test device

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Testing device for operation of current changing chain and control method

A cascaded converter service test device