检索结果-南通市图书馆

unbalanced load Simulation of Electronic Power Transformer in Distribution System

在线全文

学校读者我要写书评

暂无评论

引用

Electricity 2006年第1期17卷 38-43页

作者： Wang Dan Mao Chengxiong Lu Jiming Fan Shu Cao Jiewei Wang Ben（Translated） Huazhong University of Science and Technology 不详

A control scheme of electronic power transformer (EPT) in a three-phase four-wire distribution system, which included an input section, an isolating section and an output section, was researched under unbalanced loads. The simple and appropriate control scheme was developed through analyzing the system requirements of the primary side and the load requirements of the secondary side. In the input section, a dual-loop control in synchronous rotating d-q coordinates was introduced, and in the output section, a dual-loop control based on instantaneous output voltage was used. load characteristics of EPT were investigated by using Matlab/Simulink software. Simulation results showed that, with the proposed control scheme, the EPT has good performances and the sinusoidal input current and constant output voltage can be realized under both balanced and unbalanced loads.

关键词： electronic power transformer distribution system unbalanced load

A novel control strategy for load converter of DC isolated distribution system under unbalanced loading conditions

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 890-899页

作者： R.NOROOZIAN M.ABEDI G.B.GHAREHPETIAN S.H.HOSSEINI Department of Electrical Engineering Amirkabir University of Technology Department of Electrical and Computer Engineering Tabriz University

A novel control strategy for the load converter supplying the unbalanced AC load in a DC isolated distribution system is presented. The control algorithm results in balanced and sinusoidal load voltages under unbalanced AC loading. The unbalanced load is characterized in the d-q-0 rotating coordinate based on symmetrical sequence components. Also, the mathematical model of the load converter in both a-b-c and d-q-0 coordinates is derived by using the average large signal model. Then, two control strategies for the load converter are presented. The first one uses the conventional d-q-0 controller to ensure the voltage and current regulation. The second one is a newly proposed control strategy based on the decomposition of the voltage and current into in-stantaneous positive, negative, and zero sequences. These three sequences are controlled independently in their own reference frames as DC signals. The performance of the load converter using these two control strategies is compared. Simulation results show the validity and capability of the newly proposed control strategy.

关键词： unbalanced load Power quality Symmetrical components Control strategy

Optimal electromagnetic hybrid negative current compensation method for high-speed railway power supply system

在线全文

学校读者我要写书评

暂无评论

引用

Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 123-134页

作者： Jiaxin YUAN Yongheng ZHONG Chenmeng ZHANG Wenjun ZENG Baichao CHEN Cuihua TIAN Changhong DENG Min ZHOU Kazuhiro MURAMATSU Jin WANG School of Electrical Engineering Wuhan UniversityWuhanHubeiChina School of Resource and Environment Science Wuhan UniversityWuhanHubeiChina Department of Advanced Technology Fusion Saga UniversitySagaJapan Electrical and Computer Engineering Ohio State UniversityColumbusOHUSA

To achieve economical compensation for the huge-capacity negative sequence currents generated by high-speed railway load, an electromagnetic hybrid compensation system(EHCS) and control strategy is *** EHCS is made up of a small-capacity railway static power conditioner(RPC) and a large-capacity magnetic static var compensator(MSVC). Compared with traditional compensation methods, the EHCS makes full use of the SVC’s advantages of economy and reliability and of RPC’s advantages of technical capability and flexibility. Based on the idea of injecting a negative sequence, the compensation principle of the EHCS is analyzed in detail. Then the minimum installation capacity of an EHCS is theoretically deduced. Furthermore, a constraint optimization compensation strategy that meets national standards, which reduces compensation capacity further, is proposed. An experimental platform based on a digital signal processor(DSP) and a programmable logic controller(PLC) is built to verify the analysis. Simulated and experimental results are given to demonstrate the effectiveness and feasibility of the proposed method.

关键词： unbalanced load Electromagnetic hybrid compensation Railway static power conditioner(RPC) Magnetic static var compensator(MSVC) Capacity optimize