A Modular Capacitor Voltage Equalization Control Method for Modular Multilevel Converter
A modular multi-level, voltage equalization control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve long aggregation time, large communication volume, control frequency increase, etc. problem, achieve the effect of reducing the time spent, increasing the control frequency, and overcoming the large amount of communication
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[0031] refer to figure 2 , image 3 and Figure 4 , the modular multilevel converter consists of 3 phases, and each phase contains 2 bridge arms. Suppose each bridge arm has M modules, and each phase has 2M modules. At any time, each phase contains two There are only M modules in each bridge arm to keep the DC side voltage constant. The input and removal of bridge arm modules are as follows: image 3 and Figure 4 As shown, the module capacitor is connected to the circuit and provides its own voltage when it is switched on, and it is equivalent to the module being short-circuited when it is cut off. When it is switched on, the module capacitor may be charged or discharged, and the direction of the charging current of the module is specified as the positive direction, such as image 3 (a) shown.
[0032] 1) It is assumed that each bridge arm has 200 modules, which are marked as SM1 to SM200 according to the actual physical connection sequence, and are divided into 10 gro...
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