本文選題：虛擬磁鏈預(yù)測模型 + 并網(wǎng)逆變器　； 參考：《安徽工程大學(xué)》2017年碩士論文

【摘要】：光伏是新能源供給線的主干力量。逆變器是新能源發(fā)電的重要環(huán)節(jié)。光伏逆變器則是光伏作為新能源供給電能的關(guān)鍵設(shè)備,它是落實到實際事物的變流裝置。光伏逆變器以其安裝方式簡易、能源獲取便捷等特點(diǎn),在新能源市場中大放光彩,促進(jìn)了光伏逆變器市場蓬勃發(fā)展。單一的逆變器并不能克服風(fēng)、光、潮汐、地?zé)岬乳g歇性能源的局限性。為迎合市場需求的不斷變化,克服新能源的缺點(diǎn)。研究混合式逆變成為光伏逆變較為主要的研究方向之一。混合式光伏逆變器即是新能源應(yīng)用于實踐的變流裝置,也不僅限于變流裝置,它是新一代的能源管理器。新能源雖然無污染,資源儲備量大,但其獨(dú)特的間歇性和不穩(wěn)定性,在工程實踐中高效利用并非易事。本文以中小功率的混合式逆變器為研究內(nèi)容,重點(diǎn)工作放在系統(tǒng)結(jié)構(gòu)的分析與設(shè)計、系統(tǒng)運(yùn)行模式剖析與優(yōu)化、控制策略的介紹與改進(jìn)和涉及電路參數(shù)設(shè)計的系統(tǒng)控制穩(wěn)定性分析。首先,通過文獻(xiàn)檢索與市場調(diào)查分析市場上有的、文獻(xiàn)提及的逆變器系統(tǒng)結(jié)構(gòu)原理,分析其結(jié)構(gòu)特點(diǎn),在特定的工況下分析該結(jié)構(gòu)的優(yōu)缺點(diǎn)。針對非計劃離網(wǎng)提出基于直流母線結(jié)構(gòu)模式的改進(jìn)型結(jié)構(gòu)模式。分析該結(jié)構(gòu)模式對于非計劃離網(wǎng)的應(yīng)對機(jī)制與其結(jié)構(gòu)所確立的優(yōu)點(diǎn),提出基于分時雙向定母線電壓的運(yùn)行模式,改善系統(tǒng)受外電網(wǎng)變化而帶來的波動,并利用Simulink搭建仿真模型,驗證該運(yùn)行模式的可行性;第二,針對DC/DC功能模塊電路的拓?fù)浣Y(jié)構(gòu)進(jìn)行系統(tǒng)建模,利用Matlab工具平臺,分析涉及具體參數(shù)設(shè)計時系統(tǒng)的穩(wěn)定性,根據(jù)分析結(jié)果選擇性的在控制環(huán)節(jié)中加入PID穩(wěn)定性控制環(huán)節(jié),通過Simulink仿真,驗證基于電池充放電的恒流恒壓控制;第三,根據(jù)文獻(xiàn)檢索分析現(xiàn)有逆變功能模塊并網(wǎng)控制策略,階梯式介紹電壓矢量控制、功率直接控制和虛擬磁鏈技術(shù)的引入,詳細(xì)剖析各并網(wǎng)控制策略原理,提出各控制策略在采樣與控制環(huán)延時存在延時的共同缺點(diǎn),在此基礎(chǔ)上提出基于卡爾曼濾波的改進(jìn)方案優(yōu)化控制性能。最后在上述理論的基礎(chǔ)上,設(shè)計搭建10kW混合式逆變器實驗平臺。通過實驗與仿真平臺對混合式逆變器的各項性能指標(biāo)進(jìn)行測試:雙向DC/DC模塊的充放電控制;多直流母線的電壓穩(wěn)定性控制;特定非計劃離網(wǎng)工況下的穩(wěn)定性控制等做了不同工況的實驗研究。在非計劃離網(wǎng)工況下,二級直流母線穩(wěn)定性相對提高。分析實驗所得數(shù)據(jù),驗證了本方案的可行性。
[Abstract]:Photovoltaic is the backbone of the new energy supply line. Inverter is an important link in new energy generation. Photovoltaic inverter is the key equipment of photovoltaic power supply as new energy, and it is the conversion device to realize the actual things. Photovoltaic inverter (PV) has the advantages of simple installation and convenient access to energy, which has greatly glowed in the new energy market and promoted the vigorous development of photovoltaic inverter market. A single inverter cannot overcome the limitations of intermittent energy such as wind, light, tide, and geothermal. In order to meet the changing needs of the market, overcome the shortcomings of new energy. The research of hybrid inverter has become one of the main research directions of photovoltaic inverter. Hybrid photovoltaic inverter is a new generation of energy management device, which is not only limited to converters, but also used in practice. Although new energy is pollution-free and has a large resource reserve, its unique intermittency and instability are not easy to utilize efficiently in engineering practice. This paper focuses on the analysis and design of the system structure, the analysis and optimization of the system operation mode, taking the medium and small power hybrid inverter as the research content. The introduction and improvement of control strategy and the analysis of system control stability involving circuit parameter design. Firstly, the structure principle of the inverter system mentioned in the literature is analyzed by literature retrieval and market survey, and the advantages and disadvantages of the inverter system are analyzed under the specific working conditions. An improved DC bus structure model is proposed for unplanned off-grid. Based on the analysis of the response mechanism of the structure to unplanned off-grid and the advantages established by its structure, the operation mode based on time-sharing bi-directional fixed bus voltage is put forward to improve the fluctuation of the system caused by the change of external power network, and the simulation model is built by using Simulink. The feasibility of the operation mode is verified. Secondly, the system modeling of the DC / DC functional module circuit topology is carried out, and the stability of the system is analyzed by using Matlab tool platform, which involves the design of specific parameters. According to the results of the analysis, the pid stability control link is added selectively to the control link. Through Simulink simulation, the constant current and constant voltage control based on battery charge and discharge is verified. Thirdly, according to the literature retrieval, the existing inverter function module grid-connected control strategy is analyzed. This paper introduces the introduction of voltage vector control, direct power control and virtual flux linkage technology, analyzes the principle of each grid-connected control strategy in detail, and points out the common shortcomings of each control strategy in the delay of sampling and control loop. On this basis, an improved scheme based on Kalman filter is proposed to optimize control performance. Finally, on the basis of the above theory, a 10 kW hybrid inverter experimental platform is designed and built. The performance indexes of hybrid inverter are tested by experiment and simulation platform: charge and discharge control of bi-directional DC / DC module voltage stability control of multi-DC bus; The stability control under the specific off-grid condition is studied in different working conditions. Under unplanned off-grid condition, the stability of two stage DC bus is relatively improved. The feasibility of the scheme is verified by analyzing the experimental data.
【學(xué)位授予單位】：安徽工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464

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