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广义瞬时无功功率理论在广义有源电力滤波器参考电流检测中应用研究 总被引:1,自引:0,他引:1
对广义有源电力滤波器和广义无功功率理论在广义有源电力滤波器参考电流检测中的应用问题进行了研究,介绍了广义有源电力滤波器的主电路、工作原理以及参考电流检测方法,给出了仿真结果.理论分析和仿真结果显示,使用六桥臂PWM变流器实现广义有源电力滤波器的主电路,基于αβ0正交变换的广义瞬时无功功率理论检测广义有源电力滤波器的参考电流,使广义有源电力滤波器具有功能强、性能好以及参考电流检测实时性好、精度高、实现容易等特点. 相似文献
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基于DSP和滑模变结构控制的三相三线有源电力滤波器 总被引:1,自引:0,他引:1
针对滑模变结构控制方法在有源电力滤波器中的应用问题,提出了基于DSP的有源电力滤波器的谐波和无功电流实时检测方法,建立了三相三线有源电力滤波器电流控制回路数学模型,提出了滑模变结构控制方法,对该控制策略下三相三线有源电力滤波器的控制性能进行了分析,该方法跟踪的快速性好,系统的稳定性好,具有良好的纠偏能力。给出了基于该检测和控制方法的有源电力滤波器的仿真和实验结果,结果证明了该方案应用于有源电力滤波器的正确性和可行性。 相似文献
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分析有源电力滤波器的基本原理,为了验证有源电力滤波器基于电压空间矢量滞环电流控制方法的正确性,并加深对其控制规律的认识和理解,本文用MATLAB/SIMULINK对有源电力滤波器进行了动态仿真研究.仿真结果表明,改进的电流控制方法能有效地滤除负载中的绝大部分谐波,提高了有源电力滤波器的综合性能. 相似文献
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有源电力滤波器在电能质量控制中的应用 总被引:15,自引:12,他引:15
有源电力滤波器是治理谐波,改善电能质量的有效措施。本文对有源电力滤波器的工作原理,及其不同接线方式的特点和适用范围进行了综述。比较了几种有源电力滤波器以及无源滤波器的组合方案,分析了各自的优缺点。最后,对有源电力滤波器的应用前门进行了展望。 相似文献
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为解决并联型有源电力滤波器三相电流之间和有功无功电流之间的强耦合问题,以达到改善负载补偿效果的目的,总结了近年来相关学者对有源电力滤波器解耦控制的研究工作。首先,分析了并联有源电力滤波器的结构和特点。然后,从搭建模型的不同类型出发,对比分析了三相三线制、三相四线制及混合型并联有源电力滤波器的结构特点和控制方法,研究了近年来有源电力滤波器各种解耦控制方法的研究进展及相互的联系。最后,结合近年来新兴的控制方法,对有源电力滤波器解耦控制的研究做了展望。 相似文献
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《Electric Power Systems Research》1996,36(3):157-161
This paper presents an active filter using the synchronous detection method. The equal-current synchronous detection method (CSD) is applied to calculate the reactive and harmonic current compensation components for triggering an active filter in an unbalanced three-phase power system. The experimental results of active filter operation using the synchronous detection method show that it is effective in eliminating line current harmonics and compensating the reactive current component. The merits of the proposed method are its capability to operate under an unbalanced three-phase system by per-phase calculation, to avoid conversion error by forced waveform calculation, to balance the unbalanced load and to accomplish a good performance with a very simple implementation. 相似文献
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主要介绍了应用于低压配电网三相四线系统的配电网有源电力电子补偿装置,分析了直接检测基波有功电流分量的基本原理。利用此种控制方式的配电网有源补偿装置在谐波、无功方面的补偿特性,尤其在配电台区负荷不平衡情况下,通过在Matlab/Simulink环境下仿真,证明此种配电网有源补偿装置检测控制方法的可行性和对三相负载不平衡情况下的良好补偿特性。最后通过开发样机证明了此种理论在补偿配电台区无功及三相电流不平衡情况下的有效性。 相似文献
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Cheng-Che Chen Yuan-Yih Hsu 《Power Delivery, IEEE Transactions on》2000,15(4):1258-1264
A new approach is presented for the design of a shunt active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. A major feature of the proposed approach is that it does not require symmetrical component transformation to transform the three-phase voltages and currents to α-β-o quantities. This makes practical implementation of the proposed method easier than the symmetrical component transformation approach. In addition, the power factor of the positive-sequence fundamental component is close to unity and only positive-sequence power is supplied by the source. The effectiveness of the proposed control algorithm is demonstrated by computer simulation and experimental results of a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads 相似文献
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新型高压直流输电系统接入三相不平衡电网分析 总被引:1,自引:1,他引:0
新型高压直流输电系统接入三相电压不平衡电网时会遇到直流电容电压出现2倍工频纹波的问题,从而导致换流器性能下降,影响整个系统的正常运行。若只考虑基波电动势,使用对称分量法可以将不平衡电压分解成对称的正序和负序2部分,而这2部分平衡且相互独立。换流器d、q轴分量是直流正序分量与2次交流谐波的负序分量之和,参考在电压平衡情况下的数学模型,可以得到三相电压不平衡情况下电压源型换流器在两相同步旋转坐标系下的数学模型,这个数学模型包含正序和负序2个部分。由三相输入的复功率可知,有功功率包含2次余弦和正弦部分,通过正序电流和负序电流分别独立控制的双电流闭环控制方法使其为零,从理论上就可以消除直流电容电压的2次纹波。利用电力系统仿真软件Matlab/Simulink对系统进行仿真,结果表明,双电流闭环的控制方法可消除直流电压的纹波,保证了新型高压直流输电系统在电压不平衡的情况下仍然具有良好的性能。 相似文献
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电网调度自动化信息分析考核系统 总被引:2,自引:0,他引:2
对省网发电厂、变电站的远动数据进行关联性分析,设计了测点评分系统,对每一个厂站的数据进行评分。提出的17项考核指标分别为:厂站RTU运行、母线有功不平衡、母线无功不平衡、线路本对端有功不平衡、线路本对端无功不平衡、线路本对端电流不平衡、变压器有功不平衡、变压器无功不平衡、P,Q,J不匹配、母线电压不合理、遥信不对位、刀闸并母线、挡位位置不合理、可疑数据、可疑地刀、有效数据未采用、多源数据误差大。对不满足电网运行基本规律的数据给予提示,为远动人员进行有针对性的故障处理提供依据,以提高能量管理系统(EMS)实测数据的准确性。 相似文献
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This paper presents the analysis and design of a 3-phase 4-leg (3P4L) unified series–parallel active filter (USPAF) with ultracapacitor energy storage (UCES) for improving the power quality in three-phase four-wire (3P4W) distribution system. The series and parallel active filter (AF) of 3P4L USPAF system are realized by four-leg voltage source inverters (VSIs) to a common dc-link capacitor. Due to its high power density, the UCES is well-suited to supply high power for short period of time. The objective of this paper is to enhance the unbalanced voltage sag mitigating capability of the 3P4L USPAF system by adding UCES, directly connected in the dc-link. This is achieved by injecting energy from the UCES to maintain the dc-link voltage constant. Thus, the proposed system is capable of mitigating unbalanced voltage sag with zero-sequence component in the source voltage and compensating harmonic, reactive power and unbalanced current of the load in 3P4W distribution systems. The proposed scheme is validated by an experimental prototype with a 1.93 F UCES bank and using dSPACE DS1103 real-time control platform in the laboratory. The experimental results show that the combined system offer improved performance to maintain the load voltage constant at its rated value during unbalanced voltage sag in the supply voltage. 相似文献
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