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High-voltage direct current (HVDC) circuit breaker with rapid fault clearing is an important equipment for protecting DC transmission system. The mechanical vacuum circuit breaker based on artificial current zero (ACZ) is excellent to interrupt the large current. A prototype of mechanical HVDC circuit breaker based on ACZ is simulated by Matlab in this paper. The main circuit breaker and the commutation...
This paper introduces vector control of six-phase PMSMs with selective harmonic elimination PWM (SHEPWM) technology. Mathematic model of six-phase PMSM is given. Then relation between harmonic currents and voltages is derived. Harmonic current responses of salient pole six-phase PMSMs and non-salient pole six-phase PMSMs are different by applying the same harmonic voltage excitation. Besides, the...
A novel hybrid circuit breaker using IGBT and high-speed repulsion mechanism was given in this paper, which can isolate the failed power supply within 2ms. The high-speed electromagnetic repulsion mechanism is connected in parallel with IGBT, and the device is especially suitable for isolating or switching fault power in low voltage area. It has both advantages of traditional mechanical switches and...
Since selective harmonic elimination PWM (SHEPWM) was proposed, the calculation of switching-angle curves has been a hot research point. Up to now, many approaches have been applied and multiple solutions of SHE equations have been obtained. Multiple sets of switching-angle curves provide SHEPWM strategies, which are often adopted in the control system of induction machines for railway driving, more...
The electromagnetic repulsion actuator is a novel high-speed one based on the principle of eddy current. Its driving equipment is mainly composed of coils and repulsion dish. Its main characteristics are the short energizing time, high speed movement and the ability that can drive the switch to cut off the faults in power grid within a very short time. In this paper, an improved repulsive force driver...
Selected harmonics elimination PWM (SHEPWM) strategy adopted in railway driving system promises to have better performance than other PWM strategies, such as SVPWM and SPWM. However, since SHEPWM was proposed, the calculation of switching-angle curves has been a hot research point. Up to now, many approaches have been applied and multiple solutions of SHE equations have been obtained. This paper presents...
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