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In this paper, a new current control approach applied in linear synchronous motor (LSM) drive system is proposed for traction-system. The proposed method is featured by adjusting the current proportions of paralleled converters in double-end supply. First, the theoretical model of LSM of double-end supply is established and the control strategy consists of an outer PI speed closed-loop, an inner current...
The common mode current of upper arm and lower arm in a modular multilevel converter (MMC) can be divided into two parts: a DC component and an AC component which is called the circulating current. The circulating current will increase power losses and may threaten the safe operation of the power devices and capacitors. To solve this question, this paper analyses the harmonics of the circulating current...
This paper describes the operation of modular multilevel converter (MMC). A control method of adding the feed-forward current is introduced. Another strategy of removing the second harmonic current is also described in order to improve the arm currents. Simulation results based on a detailed PSIM model prove the effectiveness of the two methods. The paper presents principle of parameters selection...
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