MMC control method under unbalanced grid voltage based on Lyapunov function
A technology of grid voltage and control method, applied in the direction of power transmission AC network, electrical components, circuit devices, etc., can solve the problems of current three-phase asymmetry, power fluctuation, voltage fluctuation, etc., and achieve high power quality and easy back-to-back connection. Effect
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[0091] like figure 1 The topology diagram of MMC is shown. The modular multilevel converter (MMC) includes three bridge arms a, b, and c. Each bridge arm is composed of upper and lower bridge arms. Each bridge arm is composed of multiple sub-modules. The topology of the module is as follows figure 2 shown.
[0092] A kind of MMC control method under unbalanced grid voltage based on Lyapunov function, this method comprises the following steps:
[0093] (1) Establish MMC mathematical model;
[0094] (2) obtain the steady-state value of the MMC switch function according to the MMC mathematical model;
[0095] (3) Determine the fluctuation amount of the MMC switch function based on the Lyapunov function;
[0096] (4) Determine the control value of the MMC switch function according to the steady-state value of the MMC switch function and the magnitude of the fluctuation of the MMC switch function, and control the work of the MMC according to the control value of the switch fun...
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