大功率电弧加热器电源的设计研究

研究了63MW等级的大功率电弧加热器交直流电源的主电路设计和控制策略。提出了一种相移叠桥组合晶闸管整流主电路结构，使得该电源输出直流电压从1kV到21kV的不同工况时，其输入端的功率因数不小于0.9，且高功率时THD小于5%。根据主电路相移叠桥结构的特点，提出了一种非线性反馈控制器和前馈控制器相结合的复合稳流控制策略，稳流精度能够达到0.1%。实验结果表明，相移叠桥组合晶闸管主电路结构达到了电源电能质量设计指标；采用复合稳流控制策略后，稳流精度不仅能够达到设计指标，而且可以去掉主电路中的稳流电阻，从而减小了电源系统1.8MW的电阻热耗。

Study on High Power Converter for Arc Heater Applications

An AC-DC converter and its control strategy for 63MW high power arc heater is investigated. A new main circuit configuration named phase-shift bridge cascaded multiplex is proposed in this paper. This new configuration enables higher power factor more than 0.9 and lower THD distortion less than 5% at high power condition for AC side of the converter at conditions various from DC 1kV to DC 21kV output voltages. A kind of current stabilizing control scheme combined nonlinear feedback and feedforward Based on characteristic of the proposed AC-DC converter configuration. Upon this control scheme, the stabilized current precision reaches 0.1%. The results of the experiment indicates that the phase-shift bridge cascaded multiplex AC-DC converter satisfies the requirement of the power quality and current stabilized precision. As the benefit of the current stabilizing control scheme for the AC-DC converter is the stabilizing resistor could be saved which will dissipate 1.8MW power loss in thermal conversion .