大容量交流电弧炉柔性供配电方案控制策略  

Control Strategies of Flexible Power Supply and Distribution Scheme for Large Capacity AC Electric Arc Furnace

作　　者：赵崇滨 姜齐荣[1] 郭旭[1] 刘东[2] Zhao Chongbin;Jiang Qirong;Guo XuLiu;Dong(State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing,100084,China;Capital Engineering&Research Incorporation Co.Ltd Beijing,100176,China)

机构地区：[1]电力系统及大型发电设备安全控制和仿真国家重点实验室(清华大学电机系),北京100084 [2]中冶京诚工程技术有限公司,北京100176

出　　处：《电工技术学报》2021年第16期3386-3399,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金智能电网联合基金集成项目(U1866601);国家电网有限公司科技项目(520940200070)资助。

摘　　要：合理化供配电技术是调控大容量交流电弧炉负载能量平衡的关键。含模块化电力电子功率单元的柔性供配电方案可显著减轻交流电弧炉运行对系统电能质量的影响,通过改进其多环节控制策略可以进一步提高交流电弧炉冶炼的性能并降低对系统的频率冲击。首先,该文提出功率单元逆变级采用电流控制模式取代电压控制模式与固有电极调节配合,提升控制系统带宽;其次,设计该方案针对多种运行工况的控制策略,增加其实际应用的灵活性与面向系统的友好性;再次,改进逆变级调制策略以抑制潜在的高频共模电流风险;最后,根据实际参数仿真验证了多种控制策略的有效性,可充分发挥所提方案电力电子主导的软硬件优势。Reasonable power supply and distribution technology is the key to control the load energy balance of large capacity AC electric arc furnaces(EAF).The novel flexible power supply and distribution scheme with modular power electronic power units can mitigate the influence of AC EAF operation on power quality of the system significantly.By improving its multi-link control strategies,the smelting performance of AC EAF can be further improved and the frequency impact on the system can be reduced as well.Firstly,the voltage control mode(VCM)is replaced by the current control mode(CCM)of the inverter stage in the power unit to coordinate with the inherent electrode regulation,which improves the bandwidth of the control system.Then the control strategies for multiple operating conditions of the novel scheme are designed to increase the flexibility in practical application and the friendliness to the system.Furthermore,the modulation strategy of the inverter stage is improved to suppress the potential high-frequency common mode circuit.Finally,the effectiveness of various control strategies is verified by simulation based on the actual parameters,which can give full play to the advantages of software and hardware dominated by power electronics in the novel scheme.

关 键 词：交流电弧炉 柔性供电 电能质量 电流控制模式 零共模PWM 

分 类 号：TM924.4[电气工程—电力电子与电力传动] TM727.3