Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor
A technology of DC side voltage and equalizing capacitors, which is applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, etc., can solve problems such as limited range, low harmonic frequency, and small phase angle adjustment range, and achieve improved Effects of reliability, cost reduction, and simplification of control procedures and regulator design
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[0049] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0050] The structure of chained STATCOM is as follows figure 1 As shown, it is composed of grid, reactive load, connected inductor, and cascaded multilevel inverter (Cascaded Multilevel Inverter, CMI). The CMI consists of N power modules connected in series. The present invention is described with a star connection structure, and the control method of the delta connection can be analogized. The CMI of each phase is connected in parallel to the common connection point (Point of Common Coupling, PCC) of the system after connecting the inductor in series. The power module that constitutes CMI is a complete single-phase inverter, including independent power switch tube, DC side power supply, drive circuit, detection circuit, protection and control circuit, etc. It can be a diode clamping circuit, or a capacitor Type clamping circuit, also can be 3H bridge inverter circ...
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