1.河海大学能源与电气学院,江苏省南京市 211100;2.国网江苏省电力有限公司电力科学研究院,江苏省南京市 211103
统一潮流控制器可以快速高精度地调节电网潮流,但成本较高,而移相器造价低廉却无法实现连续调节,补偿精度不高,且切换电压级数时会产生较高冲击。文中通过改进移相器中的晶闸管阀组,推衍出一种基于两电平矩阵式直接交-交变换拓扑的绝缘栅双极晶体管(IGBT)-晶闸管混合阀组,在不使用电解电容和电抗器的前提下,利用全控器件实现无级高精度调压,利用晶闸管实现阀组极性反转。然后,提出基于该阀组的混联式快速无级调压移相器,在保留传统晶闸管移相器主体结构的同时,在每相增加IGBT-晶闸管混合阀组,通过混合阀组与普通阀组的协同运行实现移相器工况的毫秒级快速调节。此外,提出阀组驱动附加尖峰抑制策略避免阀组切换时的电压、电流冲击。最后,通过仿真验证了所提移相器的实用性。
国家自然科学基金资助项目(52377180);已申请国家发明专利(申请号:202310896377.9)。
王楚扬(1990—),男,博士,教授,硕士生导师,主要研究方向:电力系统中电力电子装备以及电力电子化电力系统。E-mail:wangchuyang@hhu.edu.cn
董萱(2000—),女,硕士研究生,主要研究方向:电力电子化电力系统的建模与控制。E-mail:dx15706175299@163.com
林金娇(1988—),女,硕士,高级工程师,主要研究方向:电力系统继电保护、柔性直流输电技术。E-mail:linjinjiaoyx@126.com
张犁(1985—),男,通信作者,博士,教授,博士生导师,主要研究方向:新能源变换器拓扑、控制及可靠性。E-mail:zhanglinuaa@hhu.edu.cn
1.School of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China;2.Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
The unified power flow controller can quickly and accurately adjust the power flow in the power grid. However, it comes with a high cost. The phase-shifting transformer has a low cost but cannot realize the continuous adjustment, exhibits lower compensation accuracy, and generates higher impacts when switching voltage levels. This paper improves the thyristor valve group in the phase-shifting transformer and derives a hybrid valve group of insulated gate bipolar transistors (IGBTs) and thyristors based on the two-level matrix-type direct AC-AC conversion topology. Without the adoption of electrolytic capacitors and reactors, this hybrid valve group utilizes fully controllable devices for continuous high-precision voltage regulation and employs thyristors for polarity reversal of valve groups. Then, a hybrid phase-shifting transformer with rapid and continuous voltage regulation based on this valve group is proposed. While retaining the main structure of the traditional thyristor-based phase-shifting transformer, a hybrid valve group of IGBTs and thyristors is incorporated into each phase. The cooperative operation of hybrid and common valve groups realizes millisecond-level rapid adjustment of the operating condition of the phase-shifting transformer. In addition, a strategy for valve group driving with additional spike suppression is proposed to mitigate voltage and current surges during valve group switching. Finally, the practicality of the proposed phase-shifting transformer is validated through simulation.
[1] | 王楚扬,董萱,林金娇,等.基于矩阵式直接交-交变换阀组的混联式快速无级调压移相器[J].电力系统自动化,2025,49(3):189-199. DOI:10.7500/AEPS20240125006. WANG Chuyang, DONG Xuan, LIN Jinjiao, et al. Hybrid Phase-shifting Transformer with Rapid and Continuous Voltage Regulation Based on Matrix-type Direct AC-AC Conversion Valve Group[J]. Automation of Electric Power Systems, 2025, 49(3):189-199. DOI:10.7500/AEPS20240125006. |