【摘要】：儲能技術的迅速發(fā)展，使新能源分布式發(fā)電系統大規(guī)模并網運行成為可能。釩液流電池作為一種新型環(huán)保儲能電池，在儲能系統中具有廣闊的市場應用前景。儲能變流器作為電網與儲能載體之間的電氣接口，關系到整個儲能系統的安全穩(wěn)定運行。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計方案，選定雙向半橋DC/DC拓撲和帶LCL濾波器的雙向三相橋式DC/AC拓撲構成的多級型儲能變流器結構，并簡要分析了電路的工作原理。重點研究帶LCL濾波器的DC/AC級運行于并網模式時的控制策略，，建立其在dq同步旋轉坐標系下的數學模型，由LCL濾波器無源阻尼方案經過系統結構框圖等效變換，引出濾波電容電流與并網變流的雙閉環(huán)控制策略，并對dq兩軸進行解耦控制。研究基于期望頻率特性的電流雙閉環(huán)控制器的設計方法，重點分析當系統參數發(fā)生變化時，對系統穩(wěn)定性的影響。提出的設計方法在已知系統參數的情況下，可以準確的計算出內外環(huán)的控制器參數，在保證系統性能的同時使系統具有一定的魯棒性。在理論研究的基礎上，對儲能變流器的硬件系統和軟件系統進行了設計，包括對主電路參數的計算、對DC/DC控制系統和DC/AC控制系統的設計、對外圍功能電路的設計、對控制軟件的設計以及對上位機界面的設計等。其中詳細給出了采樣、信號調理、IPM接口、時序控制、保護、狀態(tài)指示、通訊接口、輔助電源系統等硬件電路的設計方案，詳細給出了系統主程序、主中斷、通信中斷、啟停時序、分相啟動、單同步坐標系軟件鎖相環(huán)、采樣處理、數字PID控制器、參數歸一化SVPWM調制算法等軟件程序的工作流程。最后，按照設計方案搭建組裝了一臺10kW釩液流儲能雙向變流器樣機，在調試過程中不斷對系統進行優(yōu)化升級，并進行了一系列實驗。 仿真實驗與樣機實驗證明所采用的控制策略與設計方法正確有效，儲能變流器系統能夠在并網逆變、孤網逆變和并網整流三個模式下穩(wěn)定運行，基本實現了系統的各項功能。
[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.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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