【摘要】：光伏發(fā)電是新能源領(lǐng)域中最有前景的能源方式,家庭戶用型的中小功率分布式光伏發(fā)電是未來的發(fā)展趨勢。逆變器是光伏發(fā)電系統(tǒng)的核心,單相H6橋光伏逆變器具有結(jié)構(gòu)簡單,共模漏電流小,電流畸變率小,安全性高等優(yōu)點(diǎn),在光伏發(fā)電行業(yè)中有很好的應(yīng)用前景。電網(wǎng)電壓背景諧波對逆變器輸出電流質(zhì)量影響較大,逆變器輸出電流諧波對電網(wǎng)和其他用電設(shè)備也有較大的危害,基于H6橋光伏逆變器的電流諧波更加復(fù)雜,研究提高H6橋光伏逆變器的電流諧波抑制特性對提高逆變器性能及其電網(wǎng)適應(yīng)性有重要意義。本課題針對單相H6橋光伏逆變器并網(wǎng)電流諧波抑制問題,提出了電流內(nèi)環(huán)準(zhǔn)比例諧振+重復(fù)控制,及電壓外環(huán)附加陷波器控制的諧波抑制方法,最后搭建了一套10k W的H6橋光伏逆變器實(shí)驗(yàn)平臺,對所提出的控制方法進(jìn)行了實(shí)驗(yàn),主要研究內(nèi)容如下:調(diào)研并總結(jié)了單相非隔離型逆變器的研究現(xiàn)狀以及H6橋光伏逆變器諧波抑制技術(shù)的研究現(xiàn)狀。分析了單相H6拓?fù)潆娐方Y(jié)構(gòu)和工作原理,在此基礎(chǔ)上分析了H6橋光伏逆變器的共模漏電流抑制機(jī)制,研究了逆變器輸出電流諧波的產(chǎn)生原因。建立了H6橋光伏逆變器電壓、電流雙閉環(huán)控制系統(tǒng)的數(shù)學(xué)模型。針對電網(wǎng)電壓多次背景諧波問題,分析了H6橋光伏逆變器傳統(tǒng)準(zhǔn)比例諧振控制的諧波抑制局限性。在此基礎(chǔ)上提出了H6橋光伏逆變器電流內(nèi)環(huán)準(zhǔn)比例諧振+重復(fù)控制,及電壓外環(huán)附加陷波器控制的諧波抑制方法。給出了基于頻域分析的電流內(nèi)環(huán)準(zhǔn)比例諧振+重復(fù)控制器和電壓外環(huán)附加陷波器的電壓控制器的參數(shù)設(shè)計(jì)方法,并驗(yàn)證了所設(shè)計(jì)控制系統(tǒng)的穩(wěn)定性。搭建了一套10k W的H6橋光伏逆變器實(shí)驗(yàn)平臺,對所設(shè)計(jì)的電流內(nèi)環(huán)準(zhǔn)比例諧振+重復(fù)控制器和電壓外環(huán)附加陷波器的電壓控制器進(jìn)行實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明在所提出的諧波抑制策略下H6橋光伏逆變器輸出電流的THD為2.273%,采用常規(guī)準(zhǔn)比例諧振控制策略下的逆變器輸出電流的THD為2.977%,所提出的電流內(nèi)環(huán)準(zhǔn)比例諧振+重復(fù)控制,及電壓外環(huán)附加陷波器控制下的H6橋光伏逆變器的輸出電流具有良好的電能質(zhì)量。
[Abstract]:PV power generation is the most promising energy mode in the new energy field, and the small and medium-sized power distributed photovoltaic power generation in the household is the future development trend. The inverter is the core of the photovoltaic power generation system, and the single-phase H6-bridge photovoltaic inverter has the advantages of simple structure, small common-mode leakage current, small current distortion rate, high safety and the like, and has good application prospect in the photovoltaic power generation industry. The influence of the power grid voltage background harmonic on the output current quality of the inverter is large, the output current harmonic of the inverter also has great harm to the power grid and other electric equipment, and the current harmonic of the H6-bridge photovoltaic inverter is more complex, It is of great significance for improving the performance of the inverter and the adaptability of the power grid by improving the current harmonic rejection characteristic of the H6-bridge photovoltaic inverter. Aiming at the problem of harmonic suppression of grid-connected current of a single-phase H6-bridge photovoltaic inverter, a harmonic suppression method controlled by a current inner-loop quasi-proportional resonance + repetitive control and a voltage outer-loop additional trap is proposed, and a set of 10k-W H6-bridge photovoltaic inverter experimental platform is finally set up, The main contents of the control method are as follows: the research status of the single-phase non-isolated inverter and the research status of the harmonic suppression technology of the H6-bridge photovoltaic inverter are summarized and summarized. The structure and working principle of the single-phase H6 topology are analyzed. On this basis, the common mode leakage current suppression mechanism of the H6-bridge photovoltaic inverter is analyzed, and the cause of the harmonic generation of the output current of the inverter is studied. The mathematical model of the voltage and current double closed-loop control system for H6-bridge photovoltaic inverter is established. The harmonic suppression limitation of the conventional quasi-proportional resonance control of the H6-bridge photovoltaic inverter is analyzed for many times of background harmonic of the grid voltage. On the basis of this, the quasi-proportional resonance + repetitive control of the current inner loop of the H6-bridge photovoltaic inverter and the harmonic suppression method controlled by the additional trap of the voltage outer loop are proposed. The parameter design method of the voltage controller of the current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap based on the frequency domain analysis is given, and the stability of the designed control system is verified. A set of 10k W 6-bridge photovoltaic inverter experiment platform is set up, and the voltage controller of the designed current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap is tested. The results show that the THD of the output current of the H6-bridge PV inverter is 2.273% under the proposed harmonic rejection strategy, and the THD of the inverter output current under the conventional quasi-proportional resonance control strategy is 2.977%, and the proposed current inner-loop quasi-proportional resonance + repeat control, And the output current of the H6-bridge photovoltaic inverter under the control of the voltage outer-loop additional trap has good electric energy quality.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464;TM615

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