有源電力濾波器設計及其多機并聯(lián)策略研究
[Abstract]:With the rapid development of industrialization in China, more and more nonlinear loads are applied to the power network, which produces a large number of reactive power and harmonic currents, which cause serious pollution to the power network. Active power filter (APF), as a kind of power electronic device which can effectively suppress harmonics and compensate reactive power, has attracted more and more attention. Because the compensation rate of single active power filter is high, but the capacity is small, the current research trend is to increase the compensation capacity of the whole system by connecting several small capacity APF in parallel. However, the traditional control strategy of APF shunt system does not optimize the power loss and service life of the shunt system. It will cause many APF in parallel system to run in no-load or light-load state for a long time, which will cause a lot of unnecessary power loss and service life loss. Therefore, it is very meaningful to study an effective parallel strategy for APF, which can minimize the power loss of the whole system while taking into account the service life. Based on the study of a single active power filter, this paper presents a APF multi-machine parallel strategy, which solves the unnecessary power loss and service life loss in the APF multi-machine parallel system. Firstly, the basic working principle and control system of active power filter are introduced, and the main hardware design and software structure design scheme of three-level I APF are introduced in detail. A three-level active power filter prototype with capacity of 100A is designed and developed. Secondly, the common parallel APF schemes are compared, and the advantages and disadvantages of different schemes are analyzed. A new parallel APF parallel scheme is proposed in the traditional parallel operation scheme, which ensures the compensation performance. The power loss of the whole parallel system can be minimized by optimization and the running time of each APF is the same. In this paper, the parallel system is modeled in MATLAB environment, and the dynamic response speed and reliability of the parallel system under load sudden change and hot pull-in state are simulated. The experimental results prove the reliability of the parallel system. Finally, on the basis of testing the power loss curve of a single APF, the power loss and service life simulation model of parallel system is established by using YALMIP toolbox in MATLAB environment. The harmonic produced by an arc furnace in a steelmaking plant is used as the harmonic source. The simulation results show that the parallel strategy can effectively reduce the power loss and operation time of the parallel system. The effectiveness of the parallel strategy is proved.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN713.8;TM761
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