A kind of upfc control system and its control method based on observer and mmc
A control system and observer technology, applied in the direction of output power conversion device, climate sustainability, high-efficiency power electronic conversion, etc., can solve the problems of complex data acquisition system, affecting the voltage balance of sub-modules, reducing the real-time control frequency of the system, etc. , to achieve the effect of eliminating data exchange, enhancing adaptability, and improving the frequency of real-time control
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[0044] Such as figure 1 Shown, is the topological structure diagram of the MMC involved in the present invention, among the figure, i diffk is the circulating current value i of each phase bridge arm diff , i kp is the upper bridge arm current, i kn is the current of the lower bridge arm, k is a, b or c, indicating the phase number. All current, voltage and power parameters are in per unit value: the controller’s active power reference P * with reactive power reference Q * , set by the operating conditions of the operator; the bridge arm voltage V of the controller S The reference V S ref The value is set by the operating conditions of the operator; the bridge arm equivalent inductive reactance L of the controller 0 with R 0 Equivalent impedance, set by operator operating conditions.
[0045] Such as figure 2 As shown, the UPFC control system based on observer and MMC of the present invention includes: AC side power control module, three DC side control modules, th...
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