Grid voltage feed-forward control system and control method for chain type STATCOM
A grid voltage and feedforward control technology, applied in flexible AC transmission system, AC network voltage adjustment, AC network to reduce harmonics/ripples, etc., can solve problems such as off-grid, to ensure harmonic characteristics and prevent off-grid Net, improve the effect of stability
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[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0043] Such as figure 1 As shown, the present invention provides a grid voltage feed-forward control system for a chained STATCOM, wherein the topology of the chained STATCOM includes a star connection and a delta connection, respectively as figure 2 and image 3 As shown, the control system adopts hierarchical control, the main controller adopts a DSP processor, and the valve controller adopts a DSP processor+FPGA processor structure; the control system includes the following functional modules:
[0044] The DC voltage sampling calculation module P1 is used to sample the DC voltage steady-state value of each module and calculate the average value U dc ;
[0045] The main controller grid voltage sampling module P2 is used for the main controller to sample the steady-state instantaneous value u of the grid voltage at a fixed time in each...
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