摘要
为了解决大规模风电并网面临的电压越限、谐波谐振、主动支撑能力变差等问题,充分利用电力电子变换装置灵活可控的优势,研发了一种集静止无功发生器(SVG)和有源滤波器(APF)功能于一体的构网型变流器。类比直流母线电容的充放电特性和同步发电机转子的加减速特性,设计有功控制环,在不引入锁相环的情况下实现电网相位跟随、谐振风险降低;基于无功-电压下垂控制原理,设计无功控制环,实现无功补偿和电压支撑;通过谐波电流检测和内环电流控制,实现负载谐波电流补偿。最后,搭建基于RT-Box的硬件在环实验平台,对所提构网型变流器的多重功能进行验证。结果表明,并联设计的集静止无功发生器和有源滤波器功能于一体的构网型变流器可大大改善电网谐波、功率因数,提高电力系统的电能质量。
To solve the abnormal voltage,harmonic resonance,poor active support capability issues of the grid-connected large-scale wind farms,by taking full advantages of the flexibility and controllability of power electronic converters,a grid-forming converter integrating the static var generator(SVG)and active power filter(APF)functions is researched and developed.By comparing the charging and discharging characteristics of the DC bus capacitor with the acceleration and deceleration characteristics of the synchronous generator,the active power control loop is designed to realize the grid phase tracking without the introduction of the phase locked loop,thus to decrease the resonance risk.Based on the reactive power-voltage droop control principle,the reactive power control loop is designed to realize reactive power compensation and voltage support.Through the harmonic current detection and inner-loop current control,the load harmonic currents are compensated.Finally,the multiple functions of the proposed control method are verified by building the hardware-in-loop experimental platform based on the RT-Box.The results show that the paralleled SVG and APF integrated grid-forming converter can greatly improve the grid harmonics and power factor and enhance the power quality of the power system.
作者
朱克平
于彦雪
胡鹏飞
李帆
沈舒仪
ZHU Keping;YU Yanxue;HU Pengfei;LI Fan;SHEN Shuyi(Economic and Technological Research Institute,State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310008,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《实验室研究与探索》
CAS
北大核心
2024年第5期42-46,92,共6页
Research and Exploration In Laboratory
基金
国网浙江省电力有限公司科技项目(SGZJJY00PSJS2250023)
国家自然科学基金项目(52007167)。
