發(fā)布時(shí)間：2018-08-18 17:41

【摘要】：儲能技術(shù)的迅速發(fā)展，使新能源分布式發(fā)電系統(tǒng)大規(guī)模并網(wǎng)運(yùn)行成為可能。釩液流電池作為一種新型環(huán)保儲能電池，在儲能系統(tǒng)中具有廣闊的市場應(yīng)用前景。儲能變流器作為電網(wǎng)與儲能載體之間的電氣接口，關(guān)系到整個(gè)儲能系統(tǒng)的安全穩(wěn)定運(yùn)行。因此，對釩液流儲能雙向變流器的研究具有重要意義。 本文首先提出了10kW釩液流儲能雙向變流器的總體設(shè)計(jì)方案，選定雙向半橋DC/DC拓?fù)浜蛶CL濾波器的雙向三相橋式DC/AC拓?fù)錁?gòu)成的多級型儲能變流器結(jié)構(gòu)，并簡要分析了電路的工作原理。重點(diǎn)研究帶LCL濾波器的DC/AC級運(yùn)行于并網(wǎng)模式時(shí)的控制策略，，建立其在dq同步旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型，由LCL濾波器無源阻尼方案經(jīng)過系統(tǒng)結(jié)構(gòu)框圖等效變換，引出濾波電容電流與并網(wǎng)變流的雙閉環(huán)控制策略，并對dq兩軸進(jìn)行解耦控制。研究基于期望頻率特性的電流雙閉環(huán)控制器的設(shè)計(jì)方法，重點(diǎn)分析當(dāng)系統(tǒng)參數(shù)發(fā)生變化時(shí)，對系統(tǒng)穩(wěn)定性的影響。提出的設(shè)計(jì)方法在已知系統(tǒng)參數(shù)的情況下，可以準(zhǔn)確的計(jì)算出內(nèi)外環(huán)的控制器參數(shù)，在保證系統(tǒng)性能的同時(shí)使系統(tǒng)具有一定的魯棒性。在理論研究的基礎(chǔ)上，對儲能變流器的硬件系統(tǒng)和軟件系統(tǒng)進(jìn)行了設(shè)計(jì)，包括對主電路參數(shù)的計(jì)算、對DC/DC控制系統(tǒng)和DC/AC控制系統(tǒng)的設(shè)計(jì)、對外圍功能電路的設(shè)計(jì)、對控制軟件的設(shè)計(jì)以及對上位機(jī)界面的設(shè)計(jì)等。其中詳細(xì)給出了采樣、信號調(diào)理、IPM接口、時(shí)序控制、保護(hù)、狀態(tài)指示、通訊接口、輔助電源系統(tǒng)等硬件電路的設(shè)計(jì)方案，詳細(xì)給出了系統(tǒng)主程序、主中斷、通信中斷、啟停時(shí)序、分相啟動(dòng)、單同步坐標(biāo)系軟件鎖相環(huán)、采樣處理、數(shù)字PID控制器、參數(shù)歸一化SVPWM調(diào)制算法等軟件程序的工作流程。最后，按照設(shè)計(jì)方案搭建組裝了一臺10kW釩液流儲能雙向變流器樣機(jī)，在調(diào)試過程中不斷對系統(tǒng)進(jìn)行優(yōu)化升級，并進(jìn)行了一系列實(shí)驗(yàn)。 仿真實(shí)驗(yàn)與樣機(jī)實(shí)驗(yàn)證明所采用的控制策略與設(shè)計(jì)方法正確有效，儲能變流器系統(tǒng)能夠在并網(wǎng)逆變、孤網(wǎng)逆變和并網(wǎng)整流三個(gè)模式下穩(wěn)定運(yùn)行，基本實(shí)現(xiàn)了系統(tǒng)的各項(xiàng)功能。
[Abstract]:The rapid development of energy storage technology makes it possible for the large-scale grid-connected operation of the new energy distributed generation system. As a new type of environmental-friendly energy storage battery, vanadium flow battery has a broad market prospect in the energy storage system. Stable operation. Therefore, the research of vanadium liquid storage bidirectional bi-directional converter is of great significance.
Firstly, the overall design scheme of 10 kW vanadium liquid flow energy storage bidirectional converter is presented. The structure of the bidirectional half-bridge DC/DC converter and the bidirectional three-phase bridge DC/AC converter with LCL filter are selected, and the working principle of the circuit is briefly analyzed. The control strategy is established and its mathematical model is established in the DQ synchronous rotating coordinate system. The passive damping scheme of LCL filter is transformed into the equivalent structure block diagram of the system. The double closed-loop control strategy of filter capacitor current and grid-connected converter is derived, and the two axes of DQ are decoupled. The proposed design method can accurately calculate the controller parameters of the inner and outer loops when the system parameters are known. It can ensure the system performance and make the system robust to a certain extent. On the basis of theoretical research, the energy storage converter is studied. The hardware system and software system are designed, including the calculation of main circuit parameters, the design of DC/DC control system and DC/AC control system, the design of peripheral function circuit, the design of control software and the design of upper computer interface. The design schemes of state indication, communication interface, auxiliary power supply system and other hardware circuits are given in detail. The work flow of the system main program, main interrupt, communication interrupt, start-stop sequence, phase-split start, single-synchronous coordinate system software phase-locked loop, sampling processing, digital PID controller, parameter normalized SVPWM modulation algorithm and other software programs are given. A 10 kW vanadium liquid flow energy storage bidirectional converter prototype was built and assembled. During the debugging process, the system was optimized and upgraded, and a series of experiments were carried out.
The simulation and prototype experiment prove that the control strategy and design method are correct and effective. The energy storage converter system can operate stably under three modes: grid-connected inverter, isolated grid inverter and grid-connected rectifier. All the functions of the system are basically realized.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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