无变压器型统一电能质量调节器多工况电能质量综合治理技术

doi:10.16183/j.cnki.jsjtu.2023.281

摘要/Abstract

摘要：

针对由电力电子负荷所导致的配电网电能质量问题,提出一种基于两桥臂拓扑的无变压器型统一电能质量调节器(TLTT-UPQC),在克服现有统一电能质量调节器(UPQC)中工频变压器体积、质量与磁饱和缺陷的基础上,能以轻量化、高灵活性形式实现对配电网电能质量的改善,满足负荷高质量用电需求.首先,从电路拓扑角度分析TLTT-UPQC的工作原理;其次,结合理论分析研究电网电压跌落、升高、畸变及阻感性、非线性负荷等工况场景下多种电能质量治理功能的运行机理,并以此为依据设计系统的控制策略;最后,搭建基于MATLAB的系统仿真模型,并通过仿真结果验证TLTT-UPQC的多功能运行性能.

关键词: 电能质量, 无变压器型统一电能质量调节器, 两桥臂变换器, 功率流, 多工况

Abstract:

To address the power quality problems caused by power electronic loads, a two-leg topology-based transformerless unified power quality conditioner (TLTT-UPQC) is proposed, which can overcome the volume, weight, and magnetic saturation of power frequency transformer in the existing UPQCs, and can improve the power quality of the distribution network in a lightweight and highly flexible form to meet the high-quality electricity demand of loads. First, the working principle of TLTT-UPQC is analyzed from the perspective of circuit topology. Then, combined with theoretical analysis, the operating mechanisms of various power quality management functions are studied in scenarios such as grid voltage drop, rise and distortion, as well as resistor-inductance and nonlinear loads, based on which, the system control strategy is designed. Finally, a MATLAB-based simulation model is developed to verify the multifunctional operation performances of the TLTT-UPQC through simulation results.

Key words: power quality, transformerless unified power quality conditioner (UPQC), two-leg converter, power flow, multiple operating conditions

中图分类号:

TM727

傅哲, 张琦, 刘杨, 万伯豪, 王婷, 孙艳飞. 无变压器型统一电能质量调节器多工况电能质量综合治理技术[J]. 上海交通大学学报, 2025, 59(2): 252-265.

FU Zhe, ZHANG Qi, LIU Yang, WAN Bohao, WANG Ting, SUN Yanfei. Comprehensive Power Quality Management for Transformerless Unified Power Quality Conditioner Under Multiple Operating Conditions[J]. Journal of Shanghai Jiao Tong University, 2025, 59(2): 252-265.

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工作模态	状态表达式
模态1	L_sc $d i s c d t$ =u_g-u_L+u_dcn, L_pc $d i p c d t$ =u_L+u_dcp
模态2	L_sc $d i s c d t$ =u_g-u_L-u_dcp, L_pc $d i p c d t$ =u_L+u_dcp
模态3	L_sc $d i s c d t$ =u_g-u_L-u_dcp, L_pc $d i p c d t$ =u_L-u_dcn
模态4	L_sc $d i s c d t$ =u_g-u_L+u_dcn, L_pc $d i p c d t$ =u_L-u_dcn

参数	数值	参数	数值
系统额定容量/(kV·A)	3×10	负荷电压u_L幅值/V	311
电网电压u_g幅值/V	311	负荷电压频率,f_L/Hz	50
电网电压频率,f_g/Hz	50	串联变换器电容,C_sc/μF	90
直流母线电压,u_{dcp, n}/V	±375	串联变换器电感,L_sc/mH	1.2
直流母线电容,C_{dcp, n}/μF	3 300	并联变换器电感,L_pc/mH	0.8
额定负载,Z_L/Ω	4.84	系统开关频率,f_s/kHz	10