Control method and device for alternating-current solid-state power controller with current limiting function

Abstract

The invention discloses a control method and device for an alternating-current solid-state power controller with a current limiting function. Through control over a first power tube and a second power tube of a main branch circuit and a third power tube and a fourth power tube of a current limiting branch circuit, when loads are normally started, natural zero-voltage turn-on and natural zero-current turnoff of the alternating-current solid-state power controller are achieved within a half of power source period, when large-capacity capacitive loads or rectifier bridge loads with large-capacity filtering capacitance are started, current-limiting charging is firstly performed through the current-limiting branch circuit, and then the alternating-current solid-state power controlled is completely turned on; when a short circuit fault happens on the alternating-current solid-state power controller, the main branch circuit is firstly turned off to perform fault current limiting, and then the alternating-current solid-state power controller is turned off. Natural zero-voltage on-off of the alternating-current SSPC is achieved within the half of the power source period, besides, the control method and device have a high-power current-limiting function, capacity for carrying the capacitive loads and the rectifier bridge loads of the alternating-current SSPC is improved, and anti-interference capacity of short circuit protection of the alternating-current SSPC is improved.

Description

technical field [0001] The invention relates to a control method and device of an AC solid-state power controller, belonging to the technical field of power electronics and electric engineering. Background technique [0002] Solid State Power Controller (SSPC for short) is a solid-state power distribution device with a semiconductor power tube as the core, which integrates the switching function of the relay and the protection function of the circuit breaker. SSPC has the advantages of no contact, no arc, no noise, fast response, small electromagnetic interference, long life, high reliability, and convenient computer remote control. [0003] AC SSPC is used in aircraft, ship AC power system or civil distribution network to realize the connection or disconnection of AC power circuit, and complete circuit fault protection and isolation. [0004] The main power circuit of an AC SSPC generally uses two power MOSFETs in anti-series connection. In terms of AC SSPC control method...

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Problems solved by technology

[0005] (1) It does not have the fault current limiting function, and the power quality of the power supply system is greatly affected by the short-circuit fault current;

[0006] (2) In the process of turning on large-capacity capacitive loads or rectifier bridge loads, the control strategy of "zero voltage turn-on" is far from enough to suppress the inrush current, so the load capacity of the capacitive and rectifier bridges is low;

[0007] (3) In the process of load short-circuit fault, the control strategy of directly shutting off the fault current is adopted, the voltage stress of the power tube is high; and the anti-interference ability is poor, and it is easy to cause false protection during the process of starting a large-capacity capacitive load or a rectifier bridge load

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