本文選題：電池儲能 + 功率調節(jié)系統��； 參考：《合肥工業(yè)大學》2014年博士論文

【摘要】：儲能既可作為發(fā)電單元又可作為負荷單元,獨特的雙向調節(jié)性能將使其在可再生能源發(fā)電消納中發(fā)揮重要作用。本文以電池儲能為研究對象,基于現階段電池系統的構建技術水平,采用VSC模塊并聯型功率調節(jié)系統作為電池儲能系統并網接口,重點研究功率調節(jié)系統的拓撲控制及儲能運行策略,主要內容如下： (1)廣泛收集整理了國內外有代表性的儲能技術文獻,歸納了典型儲能技術的基本原理、發(fā)展現狀和需要突破的關鍵技術等�？偨Y了儲能技術在傳統電力系統和新能源發(fā)電集成中的應用模式。結合電池儲能系統的配置方式、電池系統、功率調節(jié)系統和系統集成等關鍵技術,探討了面向可再生能源發(fā)電的大容量電池儲能系統構建方案。 (2)考慮并網隔離變壓器影響,建立了功率調節(jié)系統在兩相坐標系下的線性動態(tài)模型,揭示了變壓器對并網功率調節(jié)系統性能的影響。重點對比分析了3種典型坐標系下的線性電流控制策略,揭示了dq坐標系PI控制的本質及其與αβ坐標系PR控制的關聯；基于傳遞函數模型對3種坐標系下控制的穩(wěn)態(tài)誤差、動態(tài)響應、抗擾動性能進行了詳細分析。給出了PR調節(jié)器具有頻率適應性的數字化實現方案,提高了調節(jié)器對電網頻率變化的適應性。 (3)通過建立不同坐標系下模塊間環(huán)流的線性動態(tài)模型,揭示了環(huán)流產生的機理�；陔p傅里葉分析建立了變流器模塊PWM調制輸出電壓、電流的頻譜模型,通過建立的頻譜模型研究了模塊間載波交錯運行對功率調節(jié)系統共模電壓、并聯電流和模塊間環(huán)流的影響,揭示了載波交錯運行能夠消除并網電流諧波,提高等效開關頻率的本質原因。推導論證了環(huán)流分布式控制規(guī)律和結構的可行性,提出了一種基于分布式結構的高低頻復合環(huán)流抑制策略。 (4)采用阻抗建模技術和電路網絡分析方法建立了功率調節(jié)系統的集中等效電路模型,引入互聯阻抗比概念,從等效開環(huán)傳遞函數角度借助奈奎斯特判據研究了功率調節(jié)系統和電網互聯系統的交互穩(wěn)定性問題。在功率調節(jié)系統和電網互聯系統交互穩(wěn)定性分析的基礎上,進一步借助電路串并聯諧振概念分析了多VSC模塊間、VSC模塊和電網間的諧波交互作用,揭示了模塊間形成諧波交互的潛在原因。從輸入導納的角度對并網VSC控制策略進行設計,提出采用多陷波器組的電網電壓前饋方案,提高了功率調節(jié)系統和電網互聯系統的交互穩(wěn)定性和穩(wěn)態(tài)性能。 (5)以配合可再生能源發(fā)電的儲能應用為背景,給出了電池儲能PCS平滑出力波動的控制策略。分析了電網電壓不對稱對功率調節(jié)系統并網控制策略相關環(huán)節(jié)的影響,提出采用線電壓檢測的對稱分量提取與鎖相環(huán)技術,以對稱電流控制作為并網控制目標,增強了功率調節(jié)系統在電網電壓弱不對稱條件下的運行能力。提出了電網電壓對稱/不對稱跌落條件下儲能功率調節(jié)系統的統一電壓支撐策略,兼顧正序、負序無功補償；通過限流環(huán)節(jié)的設計,實現正負序電流的合理分配,避免了功率調節(jié)系統過流而觸發(fā)保護停機,優(yōu)化了功率調節(jié)系統無功容量利用率。 (6)搭建了配合可再生能源發(fā)電的電池儲能系統實驗平臺。設計了基于以太網為主干的系統網絡結構,采用套接字Socket開發(fā)了相關通訊軟件,實現了設備間的信息交互。研制了基于兩VSC模塊并聯的功率調節(jié)系統實驗樣機,編寫了硬件底層驅動程序和控制策略軟件,對PCS相關控制策略的有效性進行了實驗測試。
[Abstract]:Energy storage can be used not only as power generation unit but also as load unit. The unique bidirectional regulation performance will make it play an important role in renewable energy generation and dissipation. This paper takes battery energy storage as the research object. Based on the technical level of current battery system construction, VSC module and combined power regulation system are used as battery energy storage system. Network interface, focusing on the topology control and energy storage operation strategy of power conditioning system. The main contents are as follows:
(1) the representative energy storage technology literature at home and abroad is collated, the basic principle of the typical energy storage technology, the development status and the key technologies which need to be broken are summarized. The application mode of the energy storage technology in the traditional power system and the new energy generation integration is summarized. The key technologies of rate regulation system and system integration are discussed, and the construction scheme of large capacity battery energy storage system for renewable energy power generation is discussed.
(2) considering the influence of grid connected isolation transformer, the linear dynamic model of power regulation system in two phase coordinate system is established, and the influence of transformer on the performance of grid connected power regulation system is revealed. The linear current control strategy under 3 typical coordinate systems is compared and analyzed. The essence of the dq coordinate system PI control and its alpha beta coordinate system P are revealed. Based on the transfer function model, the steady-state error, dynamic response and anti disturbance performance of the 3 coordinate systems are analyzed in detail based on the transfer function model. The digital realization scheme of the frequency adaption of the PR regulator is given, which improves the adaptability of the regulator to the change of the frequency of the power grid.
(3) through the establishment of a linear dynamic model of the circulation between modules in different coordinate systems, the mechanism of the circulation is revealed. Based on the dual Fourier analysis, the output voltage of the converter module PWM modulation output voltage, the current spectrum model are established, and the common mode voltage of the power regulation system is studied by the established spectrum model, and the parallel electric power is connected to the power regulation system. The influence of the flow and the circulation between the modules reveals the essential reason that the carrier interlacing can eliminate the harmonics of the grid current and improve the equivalent switching frequency. The feasibility of the distributed control law and structure of the circulation is deduced, and a high frequency complex circulation suppression strategy based on the distributed structure is proposed.
(4) a centralized equivalent circuit model of power regulation system is established by means of impedance modeling and circuit network analysis, and the concept of interconnected impedance ratio is introduced. The interaction stability of power regulation system and power grid interconnected system is studied with the help of Nyquist criterion from the angle of equivalent open loop transfer function. On the basis of the interaction stability analysis of the interconnected system, the harmonic interaction between the multiple VSC modules, the VSC module and the power grid is analyzed by means of the concept of serial parallel resonance. The potential reasons for the formation of harmonic interaction among the modules are revealed. The control strategy of the grid connected VSC is designed from the angle of input admittance, and the multi trap group is proposed. The grid voltage feedforward scheme improves the interactive stability and steady-state performance of the power conditioning system and the power grid interconnection system.
(5) in order to match the energy storage application of renewable energy generation, the control strategy of the smooth output fluctuation of the battery energy storage PCS is given. The influence of the voltage asymmetry on the grid connected control strategy of the power regulation system is analyzed. The symmetrical partial extraction and phase-locked loop technology which adopts the line voltage detection is proposed, and the symmetrical current control is made by the symmetrical current control. In order to control the target and enhance the operation ability of the power regulation system under the condition of weak and asymmetrical voltage of the power grid, a unified voltage support strategy for the energy storage power regulation system under the condition of voltage symmetry / dissymmetry of the power grid is proposed, which takes both positive sequence and negative sequence reactive compensation into consideration, and the reasonable and negative sequence current is realized through the design of the current limiting link. The allocation avoids the power regulating system from overcurrent and triggers the protection and shutdown, and optimizes the utilization rate of reactive power capacity of the power regulation system.
(6) the experimental platform of battery energy storage system with renewable energy is set up. A system network structure based on Ethernet is designed. The related communication software is developed with socket Socket and the information interaction between equipment is realized. An experimental prototype of power regulation system based on the parallel two VSC module is developed, and the hardware bottom is written. The driver and control strategy software is used to test the effectiveness of the PCS related control strategy.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TM910

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