A solid-state fault current limiter (SSFCL) is the key protective equipment in a direct current distribution network.In order to meet the high voltage requirements and reduce costs,implementing a SSFCL based on series-connected insulated gate bipolar transistors (IGBTs) is a promising approach.However,voltage unbalancing of IGBTs would be introduced if the gate-loops of the IGBTs are non-identical.In this paper,a plug-in gate-loop compensator with discrete gate voltage feedback and pulsewidth current compensation is proposed.The main merits are:1) with the plug-in structure,the extra current sources only provide small power to fine-tune the gate-loop without affecting the functions provided by the commercial IGBT gate driver;2)the gate-emitter voltages of IGBTs are compared with the preset thresholds to obtain control criterion,and the pulsewidths of the current sources are controlled for gate-loop compensation,thus both analog-digital and digital-analog converters are avoided;3)the control law is easy to implement in FPGA,and is robust to voltage variation of power-loops.With the proposed compensator,the voltage unbalancing is alleviated immediately at the present switching cycle,and further eliminated cycle-by-cycle during the current limitation process.Experimental results verify the feasibility of the proposed compensator.

Rui Wang;Yu Chen;Jing Chen;Lin Liang;Li Peng

School of Electrical and Electronic En-gineering,Huazhong University of Science and Technology,Wuhan 430074,China

中国电机工程学会电力与能源系统学报（英文版）

[1]Rui Wang;Yu Chen;Jing Chen;Lin Liang;Li Peng-.Plug-in Gate-loop Compensators for Series-connected IGBT Drivers in a Solid-state Fault Current Limiter)[J].中国电机工程学会电力与能源系统学报（英文版）,2022(01):165-174

Compensators,Limiter,SSFCL,IGBTs,unbalancing,pulsewidth,pulsewidths

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