传统的高压直流输电(high voltage direct current,HVDC)系统一般在换流站交流网侧布置滤波兼无功补偿装置,谐波与无功功率通过换流变压器回馈网侧时会对变压器产生不良的影响。作者基于自耦补偿与谐波屏蔽的换流变压器,针对某实际的HVD...传统的高压直流输电(high voltage direct current,HVDC)系统一般在换流站交流网侧布置滤波兼无功补偿装置,谐波与无功功率通过换流变压器回馈网侧时会对变压器产生不良的影响。作者基于自耦补偿与谐波屏蔽的换流变压器,针对某实际的HVDC模拟系统,提出了与该变压器配套的滤波装置的接线方案,并将外罚函数法和遗传算法相结合,对上述滤波装置进行优化设计,建立了以初期投资最小为优化目标、满足系统无功需求的滤波器优化配置的数学模型。算例计算和仿真结果表明了上述优化模型及其滤波方式的正确性和有效性。展开更多
There are a lot of large capacity nonlinear loads in power systems in coal mine, such as, hoist supply system fed by power converter and cycloconverter. The harmonics generated by those nonlinear loads are very seriou...There are a lot of large capacity nonlinear loads in power systems in coal mine, such as, hoist supply system fed by power converter and cycloconverter. The harmonics generated by those nonlinear loads are very serious. The model for harmonic analysis of power electronic converter and cycloconverter is established, and a novel method for harmonic analysis is proposed in this paper. The suggested method has advantages of less memory capacity need, fast estimation and high accuracy. The comput-ing results are good agreed with the measuring results. The suggested method is much useful for the harmonic prediction of power system in coal mine.展开更多
The paper deals with analysis and synthesis of non-harmonic and non-linear sources and appliances, and their interaction with harmonic power supply network. Basic idea is based on knowledge of harmonic spectrum of the...The paper deals with analysis and synthesis of non-harmonic and non-linear sources and appliances, and their interaction with harmonic power supply network. Basic idea is based on knowledge of harmonic spectrum of the sources and/or appliances, respectively. Obviously, one need to know voltage harmonic components of voltage sources （renewable with inverters,...）, and current harmonic components generated by non-linear appliances （rectifiers,...）. Method of investigation lies on decomposition of real electric circuit into n-harmonic separated equivalent schemes for each harmonic component. Then transient analysis will be done for each scheme separately using ＂impedance harmonic matrices＂. The important fact is that each equivalent scheme is now linearized and therefore easily calculated. Finally, the effects of each investigated schemes arc summed into resulting quantities of real non-linear electric circuit.展开更多
文摘传统的高压直流输电(high voltage direct current,HVDC)系统一般在换流站交流网侧布置滤波兼无功补偿装置,谐波与无功功率通过换流变压器回馈网侧时会对变压器产生不良的影响。作者基于自耦补偿与谐波屏蔽的换流变压器,针对某实际的HVDC模拟系统,提出了与该变压器配套的滤波装置的接线方案,并将外罚函数法和遗传算法相结合,对上述滤波装置进行优化设计,建立了以初期投资最小为优化目标、满足系统无功需求的滤波器优化配置的数学模型。算例计算和仿真结果表明了上述优化模型及其滤波方式的正确性和有效性。
文摘There are a lot of large capacity nonlinear loads in power systems in coal mine, such as, hoist supply system fed by power converter and cycloconverter. The harmonics generated by those nonlinear loads are very serious. The model for harmonic analysis of power electronic converter and cycloconverter is established, and a novel method for harmonic analysis is proposed in this paper. The suggested method has advantages of less memory capacity need, fast estimation and high accuracy. The comput-ing results are good agreed with the measuring results. The suggested method is much useful for the harmonic prediction of power system in coal mine.
文摘The paper deals with analysis and synthesis of non-harmonic and non-linear sources and appliances, and their interaction with harmonic power supply network. Basic idea is based on knowledge of harmonic spectrum of the sources and/or appliances, respectively. Obviously, one need to know voltage harmonic components of voltage sources （renewable with inverters,...）, and current harmonic components generated by non-linear appliances （rectifiers,...）. Method of investigation lies on decomposition of real electric circuit into n-harmonic separated equivalent schemes for each harmonic component. Then transient analysis will be done for each scheme separately using ＂impedance harmonic matrices＂. The important fact is that each equivalent scheme is now linearized and therefore easily calculated. Finally, the effects of each investigated schemes arc summed into resulting quantities of real non-linear electric circuit.
