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基于无功功率流的UPQC协调控制策略 被引量:6
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作者 冯兴田 马文忠 霍群海 《电机与控制学报》 EI CSCD 北大核心 2013年第4期1-5,共5页
针对统一电能质量调节器UPQC常规控制中,其串并联变流器功能相对独立、利用率低的问题,提出基于无功功率流的UPQC协调控制策略。应用所设计的UPQC系统结构,协调分配UP-QC串并联变流器的无功功率输出,控制串联变流器输出电压向量垂直相... 针对统一电能质量调节器UPQC常规控制中,其串并联变流器功能相对独立、利用率低的问题,提出基于无功功率流的UPQC协调控制策略。应用所设计的UPQC系统结构,协调分配UP-QC串并联变流器的无功功率输出,控制串联变流器输出电压向量垂直相应的电流向量,控制并联变流器输出电流向量垂直相应的电压向量,有效消除了有功环流的影响。特别针对电网侧没有电能质量问题时,控制串联变流器继续输出无功功率,充分发挥两变流器的无功补偿功能。理论推导UPQC系统功率流的关系,并仿真实验分析提出的控制策略,结果表明该控制策略解决电能质量问题的同时,实现了UPQC串并联变流器功率的合理分配。 展开更多
关键词 统一电能质量调节器 无功功率流 协调控制 电压暂降 功率因数
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Two new methods for power flow tracing using bus power balance equations
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作者 Noradin Ghadimi 《Journal of Central South University》 SCIE EI CAS 2014年第7期2712-2718,共7页
Two new methods were presented for power flow tracing(PFT).These two methods were compared and the results were discussed in detail.Both methods use the active and reactive power balance equations at each bus in order... Two new methods were presented for power flow tracing(PFT).These two methods were compared and the results were discussed in detail.Both methods use the active and reactive power balance equations at each bus in order to solve the tracing problem.The first method considers the proportional sharing assumption while the second one uses the circuit laws to find the relationship between power inflows and outflows through each line,generator and load connected to each bus of the network.Both methods are able to handle loop flow and loss issues in tracing problem.A formulation is also proposed to find the share of each unit in provision of each load.These methods are applied to find the producer and consumer's shares on the cost of transmission for each line in different case studies.As the results of these studies show,both methods can effectively solve the PFT problem. 展开更多
关键词 load contribution power flow tracing proportional/non-proportional sharing network Zbus transmission cost allocation
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