本文選題：分布式發(fā)電 + 儲能變流器��； 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：分布式發(fā)電在當今社會中受到越來越多的重視,儲能系統(tǒng)對改善可再生能源發(fā)電的不確定性、功率波動等可起到重要作用。儲能變流器作為可再生能源與電網之間的重要接口設備,其并網電流質量,如諧波畸變率,是重要指標。本文以典型的LCL三相電壓型PWM變流器為研究對象,重點對畸變電網電壓下儲能變流器的電流控制策略進行研究。本文介紹了PWM變流器的拓撲結構和工作原理,建立了abc及αβ坐標系下的數學模型,設計了LCL濾波器參數并對其有源阻尼、無源阻尼諧振抑制作了分析。為簡化電流控制器的復雜解耦,設計了αβ坐標系下的比例諧振電流內環(huán)控制器。在電網電壓畸變的情況下,設計了網側電流準比例諧振控制(QPR,Quasi Proportional Resonant Control)內環(huán)與重復控制外環(huán)疊加的復合控制策略。論文對控制策略進行了細致的推導,并從理論上分析了復合控制器對電網電壓畸變的抑制作用。在電網電壓畸變以及不平衡下采用基于雙二階廣義積分器的鎖相環(huán),對正、負序分量進行分離,抑制諧波分量引起的相位波動,實現(xiàn)了對基波正序相位的準確跟蹤。研究了控制網側電流平衡以及母線電壓平衡的電流控制策略,在Matlab/Simulink中搭建變流器在畸變及不平衡電網電壓下的仿真模型,對復合控制策略的有效性進行了仿真驗證。論文具體設計了主功率電路參數、外圍保護電路、采樣調理電路及驅動電路,完成了系統(tǒng)控制策略中鎖相環(huán)模塊、QPR控制器模塊、重復控制器模塊、SVPWM模塊的數字化設計。最終,搭建了500W硬件實驗平臺,以TI公司的TMS320F28335芯片為主控制器,驗證了各個模塊設計效果,并通過聯(lián)調驗證了本文控制策略的有效性。
[Abstract]:Distributed power generation has been paid more and more attention in today's society. Energy storage system can play an important role in improving the uncertainty and power fluctuation of renewable energy generation. As an important interface equipment between renewable energy and power grid, energy storage converter is an important indicator of grid-connected current quality, such as harmonic distortion rate. In this paper, the typical LCL three-phase voltage source PWM converter is taken as the research object, and the current control strategy of the energy storage converter under the distorted grid voltage is studied. This paper introduces the topology and working principle of PWM converter, establishes the mathematical model of abc and 偽 尾 coordinate system, designs the parameters of abc filter and analyzes its active damping and passive damping resonance suppression. In order to simplify the complex decoupling of the current controller, a proportional resonant current inner loop controller in 偽 尾 coordinate system is designed. Under the condition of voltage distortion in power system, a compound control strategy is designed, in which the internal loop of QPR-Quasi proportional Resonant Control (QPR-Quasi proportional Control) and the external loop of repetitive control are superimposed. In this paper, the control strategy is deduced in detail, and the effect of the compound controller on the voltage distortion of the power system is analyzed theoretically. Under the condition of voltage distortion and unbalance, the phase locked loop based on double second order generalized integrator is used to separate the positive and negative sequence components, to suppress the phase fluctuation caused by harmonic components, and to realize the accurate tracking of the fundamental positive sequence phase. The current control strategy of current balance and bus voltage balance is studied. The simulation model of converter under distorted and unbalanced network voltage is built in Matlab / Simulink, and the effectiveness of the compound control strategy is verified by simulation. The main power circuit parameters, peripheral protection circuit, sampling conditioning circuit and driving circuit are designed in detail. The digital design of the QPR controller module and the SVPWM module of the repetitive controller module are completed in the system control strategy. Finally, the 500W hardware experiment platform is built, and the TMS320F28335 chip of TI company is used as the main controller, which verifies the design effect of each module, and verifies the effectiveness of the control strategy.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM46

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相關期刊論文 前10條

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本文編號：1992092