A test system and method for cascaded SVG power modules
A power module and test system technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of not considering the impact and reducing the accuracy of the test effect of SVG power modules, and achieve the goal of reducing difficulty and reducing demand Effect
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Embodiment 1
[0028] figure 1 It is a schematic diagram of a specific example of the SVG power module cascading topology in the embodiment of the present application. In practical application, power module cascading is a relatively common system topology form in medium and high voltage converter devices at present. High voltage output is achieved using low voltage power devices. In the SVG power module cascading topology, the structure of each power module is basically the same, and the voltage shared by each module is basically the same, but when the cascading topology is applied in the converter system, the power modules in the system There is a difference in potential. by figure 1The three-phase cascaded SVG topology shown in is an example. According to different voltage levels, usually each phase (A phase, B phase, and C phase) of the converter system is cascaded with n power modules and directly connected to the power grid. , the potential of each power module in the converter syst...
Embodiment 2
[0046] refer again figure 2 , the test system in the embodiment of the present invention includes: a grounding resistor 60 , a PC 70 , a current sensor 80 , a first voltage sensor 91 and a second voltage sensor 92 . These devices are described below.
[0047] After the test system enters the test implementation stage, the controller 50 is further configured to send test control commands and receive real-time working status information of the power module 101 to be tested, so as to carry out test control operations for the power module 101 to be tested. Wherein, the test control instruction includes: outputting resistance setting parameters to the grounding resistance described below, and the like. The working status information includes: leakage current information and / or common mode voltage information, and the like.
[0048]In order to effectively simulate the operating state of the power module 101 to be tested in the above-mentioned SVG unit, a corresponding leakage cur...
Embodiment 3
[0058] Based on the test system described in the above-mentioned embodiment one and embodiment two, if the above-mentioned contactor 33, transformer 31 and adjustable transformer 40 are all electrically controlled by the controller 50, the above-mentioned controller 50 is in the test equipment stage In the process, it is also necessary to set the corresponding working power supply and reference voltage for the power module 101 to be tested according to the following process.
[0059] Firstly, the controller 50 is used to send an invalid contactor state control signal to the contactor 33 during the test preparation stage, and send an operating voltage adjustment signal containing start adjustment instruction information to the transformer 31, so that the transformer 31 can perform the adjustment for the power module 101 to be tested. Charge.
[0060] Then, the controller 50 is used to obtain and detect the DC side voltage of the power module 101 to be tested, and when the volta...
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