【摘要】：隨著新能源技術的不斷發(fā)展和應用,發(fā)展高性能和低成本的并網(wǎng)逆變設備已成為研究熱點。由于L濾波器必須增大電感值來取得較好的濾波效果,這樣就會增加系統(tǒng)的體積和損耗,而LCL濾波器憑借著低成本、低損耗和杰出的高頻諧波抑制能力逐漸取代了L濾波器在并網(wǎng)逆變器中的應用地位。但是LCL濾波器為三階系統(tǒng),會產(chǎn)生一個諧振峰,使得系統(tǒng)極其不穩(wěn)定,那么LCL濾波器存在的諧振問題就不容忽略。本文針對抑制LCL濾波器諧振峰問題的有源阻尼法進行了探索研究,文章主要包括:首先對LCL并網(wǎng)逆變器的數(shù)學模型進行搭建,然后針對本文所選用的并網(wǎng)逆變器的控制策略進行分析,也就是對空間矢量調(diào)制方法(SVPWM)和電網(wǎng)電壓定向的原理進行了介紹,并且對有源阻尼法和無源阻尼法的區(qū)別進行了說明,對LCL濾波器的濾波特性進行了分析。其次是闡述了LCL濾波器的參數(shù)設計的約束條件,在參數(shù)設計條件約束內(nèi)優(yōu)化其參數(shù)設計,使得設計的參數(shù)不僅能夠消除在諧振頻率處系統(tǒng)延遲所帶來的影響而且能夠使系統(tǒng)在開關頻率處的衰減最小。并且根據(jù)所選的控制方法對阻尼電阻和電流控制器的參數(shù)進行選定。另外,在并網(wǎng)逆變器的控制策略基礎上對抑制LCL濾波器的諧振峰的有源阻尼算法進行探索研究。在對單側的電流反饋分析,采用逆變器側電流反饋影響并網(wǎng)功率因數(shù),而采用網(wǎng)側電流反饋不能達到很好的穩(wěn)定效果。故本文分別在傳統(tǒng)的電容電流反饋和網(wǎng)側電流反饋的雙環(huán)電流控制、電容電壓反饋和網(wǎng)側電流反的雙環(huán)控制饋基礎上加入了諧振積分器進行比較分析。當諧振積分器與基于電容電流反饋的有源阻尼法相結合時,經(jīng)過改善的諧振積分器,能夠有效的提取出諧振頻率處及其附近的電流,經(jīng)過負反饋,以達到有效抑制諧振峰的效果。當諧振積分器與基于電容電壓反饋的有源阻尼法結合時,將諧振積分器作另一種改變,使得輸出為電容電流的高頻分量,經(jīng)過負反饋后能達到比電容電流反饋更好的效果。并且經(jīng)過分析,將諧振積分器與電容電壓反饋相結合時能夠在有效的抑制諧振峰的同時有著更好的穩(wěn)定性。最后,在理論分析的基礎上,在Matlab/simulink平臺上搭建仿真模型,對所提出的控制策略進行仿真驗證,并且搭建了以TMS320F2812為主控芯片的實驗平臺。實驗與仿真結果均驗證改進控制策略的可行性,達到了預期效果。
[Abstract]:With the development and application of new energy technology, the development of high performance and low cost grid-connected inverter equipment has become a research hotspot. Because the L filter must increase the inductance value to obtain the better filtering effect, thus will increase the system volume and the loss, but the LCL filter depends on the low cost, Low loss and excellent high frequency harmonic suppression have gradually replaced the application of L filter in grid-connected inverter. However, the LCL filter is a third-order system, which will produce a resonant peak, which makes the system extremely unstable, so the resonance problem of the LCL filter can not be ignored. In this paper, the active damping method for suppressing the resonance peak of LCL filter is studied. The main contents are as follows: firstly, the mathematical model of LCL grid-connected inverter is built. Then the control strategy of grid-connected inverter selected in this paper is analyzed, that is, the principle of space vector modulation (SVPWM) and grid voltage orientation are introduced, and the difference between active damping method and passive damping method is explained. The filter characteristics of LCL filter are analyzed. Secondly, the constraints of the parameter design of LCL filter are expounded, and the parameter design is optimized within the constraints of the parameter design conditions. The designed parameters can not only eliminate the influence of system delay at the resonant frequency but also minimize the attenuation of the system at the switching frequency. The parameters of damping resistance and current controller are selected according to the selected control method. In addition, based on the control strategy of grid-connected inverter, the active damping algorithm for suppressing the resonant peak of LCL filter is studied. In the analysis of single-side current feedback, the inverter side current feedback is used to influence the grid-connected power factor, but the grid-side current feedback can not achieve a good stability. Therefore, a resonant integrator is added to the conventional double-loop current control, capacitive voltage feedback and double-loop feedback. When the resonant integrator is combined with the active damping method based on capacitive current feedback, the improved resonant integrator can effectively extract the current at and around the resonant frequency and pass through the negative feedback. In order to achieve an effective suppression of the resonance peak effect. When the resonant integrator is combined with the active damping method based on capacitive voltage feedback, the resonant integrator is changed to a high frequency component of the capacitance current, and the negative feedback can achieve a better effect than the capacitive current feedback. After analysis, the resonance integrator and capacitor voltage feedback can effectively suppress the resonance peak and have better stability. Finally, on the basis of theoretical analysis, the simulation model is built on Matlab / Simulink platform, the proposed control strategy is simulated and verified, and the experimental platform with TMS320F2812 as the main control chip is built. Both experimental and simulation results verify the feasibility of the improved control strategy and achieve the desired results.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

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本文編號：2130269