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注入式混合型有源电力滤波器(IHAPF)研究
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摘要
在我国电力工业蓬勃发展、电力负荷急剧增长的同时,非线性负载在配电系统中不断增加,对供电系统电能质量造成了严重的污染;而现代高度自动化和智能化的工业用电设备对供电系统提出了更高的要求。如何抑制电网谐波,改善电能质量已成为近年来研究的热点。因此,谐波治理已经成为电气工程领域迫切需要解决的问题。有源电力滤波器(APF)是一种用于动态抑制谐波和补偿无功功率的新型电力电子装置,具有响应速度快、补偿效果好和能够实现动态补偿的优点,因此,有着非常广阔的发展前景。
     本文首先对IHAPF的电路拓扑结构、工作原理及工作特性进行了分析,重点研究了三个关键技术:谐波电流检测、电流跟踪控制和直流侧电压控制。在谐波电流检测方面,本文详细分析了基于瞬时无功功率理论的p q谐波电流检测法与i_p i_q谐波电流检测法,通过对比研究,选用了基于瞬时无功功率理论的i p iq谐波电流检测法;在电流跟踪控制方面,本文采用了一种递推积分Pl控制算法,取得了较好的控制效果,针对该算法响应速度较慢的问题,本文采用模糊算法对递推积分PI的系数进行在线调整来提高其响应速度,仿真研究验证了该控制策略能改善APF系统稳态和动态跟踪性能;在直流侧电压控制方面,本文采用了三相电压型PWM整流器来维持IHAPF直流侧电压的稳定,详细分析了基于前馈解耦控制的双闭环控制策略,在此基础上采用了一种简化的SVPWM调制方式,仿真研究验证了该控制策略的正确性。
     最后,利用MATLAB/SIMULINK仿真工具建立了IHAPF系统仿真平台,对系统的各环节进行了建模和仿真研究,仿真结果验证了理论分析和设计的有效性和可行性。
With the vigorous development of the electric power industry and the sharpgrowth of the electric power load in our country, the nonlinear load is increasing indistribution system, power quality is caused serious pollution in the power supplysystem; On the other hand, the modern high automation and intelligent industrialelectrical equipment also put forward higher request to the power supply system. Howto suppress the harmonic, improve the quality of power has become a hot spot ofresearch in recent years. Therefore, the harmonic management has become urgentproblem to the electrical engineering field. Active power filter (APF) is a new powerelectronic devices which is used to suppress harmonic and dynamic compensationreactive power, with fast response, good compensation effect and has the advantage ofbeing able to achieve the dynamic compensation, therefore it has a very broaddevelopment prospects.
     This paper analysis the circuit topology structure, working principle andcharacteristics of IHAPF at first, focus the research on three key technology:Harmonic current detection, the current tracking control and DC voltage control. Inthe aspect of harmonic current detection,this paper makes a detailed analysis on thep-q harmonic current method andi_p i_qharmonic current method based oninstantaneous reactive power theory, through the comparative research, choose thei_p i_qharmonic current method at last; In the aspect of current tracking control, thispaper adopts a recursive integral Pl control algorithm, it has a good control effect.According to the problem of PI parameter is difficult to adjust, this paper designs afuzzy PI controller, according to the characteristics of the system, designs the fuzzyinference rules, realize the PI parameter online adjust, the simulation research provethe control strategy can improve APF system steady and dynamic trackingperformance; In the aspect of the DC voltage control, this paper adopts thethree-phase voltage source PWM rectifier to maintain the stability of the DC sidevoltage of IHAPF, detailed analysis the double closed loop control strategy based onthe feed-forward decoupling control, on this basis, adopt a simplified SVPWMmodulation mode, and the simulation research prove the control strategy is correct.
     Finally, through the MATLAB/SIMULINK simulation tool set up the IHAPFsystem simulation platform, and make simulation for all the parts of the system, thesimulation results verify the theoretical analysis and the design is effective andfeasible.
引文
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