引用本文: | 杜少通,何金泽,原亚雷,朱 军,李 威.补偿不平衡负载的HC-SVG相间电压平衡控制与直流电压取值分析[J].电力系统保护与控制,2024,52(12):33-44.[点击复制] |
DU Shaotong,HE Jinze,YUAN Yalei,ZHU Jun,LI Wei .HC-SVG phase-to-phase voltage balance control and DC voltage value analysis tocompensate for unbalanced loads[J].Power System Protection and Control,2024,52(12):33-44[点击复制] |
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摘要: |
针对由中点钳位型(neutral-point clamped, NPC)功率单元和H桥级联型(cascade H-bridge, CHB)功率单元构成的混合级联型静止无功发生器(hybrid cascade static var generator, HC-SVG)在补偿不平衡负载时产生的CHB功率单元相间电压失衡问题,提出一种基于零序电压前馈的CHB功率单元相间电压平衡控制方法,并对零序电压注入后HC-SVG直流侧电压取值进行分析。首先,分析CHB功率单元承担基波电压分量与HC-SVG输出基波电压的关系。推导HC-SVG补偿不平衡负载时CHB功率单元相间电压平衡所需的零序电压,建立零序电压前馈控制。其次,基于零序电压与补偿电流的解析关系,讨论补偿电流不平衡度与HC-SVG直流侧电压取值之间的约束关系。以6 kV/3 Mvar装置为算例,进行直流侧电压的取值分析。并与星接CHB-SVG进行对比,揭示补偿不平衡负载时HC-SVG所需直流电压低的特点。仿真验证了相间电压平衡控制与直流电压取值分析的有效性。 |
关键词: 混合级联 静止无功发生器 不平衡负载 零序电压 直流侧电压取值 |
DOI:10.19783/j.cnki.pspc.231572 |
投稿时间:2023-12-12修订日期:2024-04-28 |
基金项目:国家自然科学基金项目资助(52267018) |
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HC-SVG phase-to-phase voltage balance control and DC voltage value analysis tocompensate for unbalanced loads |
DU Shaotong1,2,HE Jinze1,YUAN Yalei3,ZHU Jun1,LI Wei 1 |
(1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China; 2. Henan
Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Jiaozuo 454003, China; 3. Power
Electronics Research Institute, State Grid Smart Grid Research Institute Co., Ltd., Beijing 102209, China) |
Abstract: |
A hybrid cascade static var generator (HC-SVG) composed of neutral-point clamped (NPC) and cascade H-bridge (CHB) power units produces phase-to-phase voltage imbalance when compensating for unbalanced loads. To address this, a phase-to-phase voltage balance control method for the CHB power unit is established based on zero sequence voltage feedforward. The DC side voltage value of HC-SVG after zero sequence voltage injection is analyzed. First, the relationship between the fundamental voltage component of the CHB power unit and the output fundamental voltage of the HC-SVG is analyzed. The zero-sequence voltage required by the phase-to-phase voltage balance of the CHB power unit when the HC-SVG compensates for unbalanced loads is deduced and zero sequence voltage feedforward control is established. Secondly, the constraint relationship between the degree of compensation current imbalance and the HC-SVG DC side voltage is discussed based on the analytical relationship between zero sequence voltage and compensation current. Taking a 6 kV/3 Mvar device as an example, the value of the DC side voltage is analyzed and compared with the star CHB-SVG. It reveals the characteristics of low DC voltage required by the HC-SVG when compensating unbalanced loads. Simulation results show the effectiveness of clustered voltage balance control and DC side voltage value analysis. |
Key words: hybrid cascade static var generator unbalanced loads zero sequence voltage DC side voltage value |