【摘要】：可再生能源發(fā)電功率的波動性和間歇性給電力系統(tǒng)的穩(wěn)定運(yùn)行帶來了巨大的挑戰(zhàn),需要儲能功率轉(zhuǎn)換系統(tǒng)(Power Conversion System,PCS)提供備用容量來實(shí)現(xiàn)電網(wǎng)的動態(tài)供需平衡。級聯(lián)型H橋儲能功率轉(zhuǎn)換系統(tǒng)是用于高壓大容量系統(tǒng)中的主要拓?fù)浣Y(jié)構(gòu),可與不同儲能介質(zhì)相結(jié)合,在大容量儲能場合有廣闊的應(yīng)用空間。本文以級聯(lián)型H橋儲能功率轉(zhuǎn)換系統(tǒng)為研究對象,對其控制策略進(jìn)行了深入的研究,并對實(shí)驗(yàn)裝置的軟硬件進(jìn)行設(shè)計(jì)。本文以級聯(lián)型H橋變換器的單相等效電路為例分析了級聯(lián)型H橋PCS的工作原理。級聯(lián)型H橋PCS的數(shù)學(xué)模型是控制策略設(shè)計(jì)的基礎(chǔ),建立了 abc、αβ和dq坐標(biāo)系下的數(shù)學(xué)模型,并給出了復(fù)頻域下的表達(dá)式。本文采用水平載波移相調(diào)制策略,詳細(xì)闡述了調(diào)制規(guī)律,具體分析了級聯(lián)型H橋單相交流側(cè)輸出電壓。本文重點(diǎn)對儲能介質(zhì)為蓄電池的級聯(lián)型H橋PCS控制策略進(jìn)行了研究,對儲能介質(zhì)為超級電容的級聯(lián)型H橋PCS控制策略進(jìn)行簡要概述。在級聯(lián)型H橋PCS數(shù)學(xué)模型的基礎(chǔ)上,采用基于PI調(diào)節(jié)器的電流前饋解耦控制策略對系統(tǒng)的有功功率進(jìn)行控制,實(shí)現(xiàn)了蓄電池組的充放電。采用零序電壓注入法實(shí)現(xiàn)了相間SOC均衡,采用基波電壓注入法實(shí)現(xiàn)了相內(nèi)SOC均衡。文中具體分析了兩種方法能實(shí)現(xiàn)均衡的原因,并給出了零序電壓和基波電壓的產(chǎn)生形式。容錯控制能夠保證系統(tǒng)在故障情況下仍能可靠運(yùn)行,本文從保證故障情況下輸出線電壓對稱和非故障單元SOC均衡兩個方面進(jìn)行理論分析,簡要介紹了容錯控制策略。本文依據(jù)工業(yè)級平臺的設(shè)計(jì)原則,搭建了 10kW小型實(shí)驗(yàn)樣機(jī),完成了驅(qū)動板電路的設(shè)計(jì),實(shí)現(xiàn)了驅(qū)動功率器件和采樣每個功率單元直流側(cè)蓄電池組電壓的功能。完成了電壓采樣板電路的設(shè)計(jì),實(shí)現(xiàn)了對AD7656時序的控制,蓄電池組電壓和驅(qū)動信號的編解碼功能。完成了主控制板和底板電路的硬件設(shè)計(jì),采用雙"DSP+FPGA"架構(gòu)實(shí)現(xiàn)了 SOC的采集,控制算法和調(diào)制策略的功能。最后,通過MATLAB仿真,驗(yàn)證了控制策略的有效性。
[Abstract]:The fluctuation and intermittency of power generation from renewable energy bring great challenges to the stable operation of power system. It is necessary to provide reserve capacity for the storage power conversion system (Power Conversion System,PCS) in order to achieve the dynamic balance between supply and demand of power grid. Cascaded H-bridge energy storage power conversion system is the main topology used in high-voltage and high-capacity systems. It can be combined with different energy storage media and has a wide application space in large capacity energy storage field. In this paper, the control strategy of cascaded H-bridge energy storage power conversion system is studied, and the hardware and software of the experimental device are designed. In this paper, the principle of cascaded H-bridge PCS is analyzed by taking the single-phase equivalent circuit of cascaded H-bridge converter as an example. The mathematical model of cascaded H-bridge PCS is the basis of control strategy design. The mathematical model of abc, 偽 尾 and dq coordinate system is established, and the expression in complex frequency domain is given. In this paper, the horizontal carrier phase shift modulation strategy is used to describe the modulation law in detail, and the output voltage of single-phase AC side of cascaded H-bridge is analyzed in detail. In this paper, the control strategy of cascaded H-bridge PCS with storage medium as storage battery is studied, and the PCS control strategy of cascaded H-bridge with super capacitor is briefly summarized. Based on the PCS mathematical model of cascaded H-bridge, the current feedforward decoupling control strategy based on PI regulator is used to control the active power of the system, and the charge and discharge of the battery is realized. Phase SOC equalization is realized by zero-sequence voltage injection method, and SOC equalization is realized by fundamental voltage injection method. In this paper, the reasons why the two methods can realize equalization are analyzed in detail, and the generation forms of zero sequence voltage and fundamental voltage are given. Fault-tolerant control can guarantee the reliable operation of the system under the condition of fault. This paper analyzes the output line voltage symmetry and the non-fault unit SOC equalization under the condition of fault, and briefly introduces the fault-tolerant control strategy. According to the design principle of industrial platform, a small experimental prototype of 10kW is built, and the design of driving board circuit is completed. The function of driving power device and sampling DC side battery voltage of each power unit is realized. The circuit of voltage sampling board is designed, and the control of AD7656 sequence, the coding and decoding function of battery voltage and driving signal are realized. The hardware design of the main control board and the backboard circuit is completed, and the functions of the SOC acquisition, control algorithm and modulation strategy are realized by using the double "DSP FPGA" architecture. Finally, the effectiveness of the control strategy is verified by MATLAB simulation.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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本文編號：2249119