本文選題：功率轉(zhuǎn)換系統(tǒng) + 組合級聯(lián)式��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：近年來,全球電力需求不斷增長,傳統(tǒng)石化資源日漸匱乏,新能源技術(shù)得到了快速發(fā)展和應(yīng)用。然而,分布式電源并網(wǎng)給電力系統(tǒng)的穩(wěn)定性和可控性帶來了極大的挑戰(zhàn)。電池儲能系統(tǒng)為解決這一問題提供了新的技術(shù)和手段。作為電池儲能系統(tǒng)的重要組成部分,功率轉(zhuǎn)換系統(tǒng)將成為研究的重點。 本文依托北京市科技計劃項目“光伏并網(wǎng)用統(tǒng)一功率控制裝備及直流微網(wǎng)技術(shù)研究與示范應(yīng)用(D131104002013003)”,對基于電池儲能的組合級聯(lián)式功率轉(zhuǎn)換系統(tǒng)進(jìn)行了理論和仿真研究,主要內(nèi)容如下： 首先,提出了一種組合級聯(lián)式功率轉(zhuǎn)換系統(tǒng)的拓?fù)浣Y(jié)構(gòu),該系統(tǒng)主要由儲能電池組、隔離型半橋DC/DC變換器和鏈?zhǔn)紻C/AC變換器組合而成。分析了這兩類變換器的基本工作原理、控制方式和功率傳輸特性。結(jié)合實驗室低壓物理模型的開發(fā),選取了功率轉(zhuǎn)換系統(tǒng)主電路的拓?fù)浣Y(jié)構(gòu)及主要參數(shù)。 其次,設(shè)計了功率轉(zhuǎn)換系統(tǒng)的協(xié)調(diào)控制策略：為確保功率的動態(tài)平衡,實現(xiàn)直流側(cè)電容電壓的恒定,DC/DC側(cè)采用移相控制和占空比控制；為了滿足系統(tǒng)功率傳遞的目標(biāo),DC/AC側(cè)采用直接電流解耦控制；為提高裝置的響應(yīng)速度和改善直流側(cè)電容電壓的品質(zhì),提出了DC/DC和DC/AC的協(xié)調(diào)控制策略,將電網(wǎng)側(cè)的實時功率指令前饋給DC/DC側(cè)。在PSCAD/EMTDC環(huán)境下建立了基于鋰電池儲能的組合級聯(lián)式功率轉(zhuǎn)換系統(tǒng)模型,應(yīng)用所提出的一整套協(xié)調(diào)控制策略,對裝置的正常調(diào)節(jié)工況、電池組額定參數(shù)和荷電狀態(tài)不同等工況進(jìn)行了仿真,驗證了控制策略的有效性。結(jié)果表明：該裝置在所提出的協(xié)調(diào)控制策略下具有較寬的電壓匹配能力,電池狀態(tài)適應(yīng)能力強(qiáng),且控制的響應(yīng)速度較快,能實現(xiàn)大容量儲能和雙向功率調(diào)節(jié)。 最后,為了應(yīng)對鏈?zhǔn)诫姵貎δ芟到y(tǒng)中的SOC不均衡問題,研究了基于調(diào)制波幅值微調(diào)的SOC自均衡控制策略,對電池組荷電狀態(tài)不均衡的情況進(jìn)行仿真,驗證了該控制策略的有效性。此外,分別對載波移相SPWM控制和SOC自均衡控制進(jìn)行了諧波分析。結(jié)果表明：采用基于調(diào)制波幅值微調(diào)的SOC自均衡控制策略,能夠合理分配各電池組承擔(dān)的功率調(diào)節(jié)量,使SOC趨于一致,提高了整個功率轉(zhuǎn)換系統(tǒng)的容量和可用率,但是由于改變了調(diào)制波幅值,會對輸出電壓的諧波性能造成一定影響。
[Abstract]:In recent years, the global electricity demand is increasing, the traditional petrochemical resources are increasingly scarce, the new energy technology has been rapidly developed and applied. However, the stability and controllability of the power system are greatly challenged by the interconnection of distributed power sources. Battery energy storage system provides new technology and means to solve this problem. As an important part of battery energy storage system, power conversion system will become the focus of research. In this paper, based on Beijing Science and Technology Project "Research and demonstration application of unified power control equipment and DC microgrid technology for photovoltaic grid-connected system, D131104002013003", the theory and simulation of combined cascade power conversion system based on battery energy storage are studied. The main contents are as follows: Firstly, the topology of a combined cascade power conversion system is proposed. The system consists of a battery pack, an isolated half-bridge DC/DC converter and a chain DC/AC converter. The basic working principle, control mode and power transmission characteristics of the two kinds of converters are analyzed. Combined with the development of laboratory low-voltage physical model, the main circuit topology and main parameters of power conversion system are selected. Secondly, the coordinated control strategy of power conversion system is designed: in order to ensure the dynamic balance of power, the DC / DC side of DC / DC side adopts phase shift control and duty cycle control; In order to satisfy the power transfer target of the system, direct current decoupling control is adopted in DC / AC side, and the coordinated control strategy of DC/DC and DC/AC is proposed to improve the response speed of the device and the quality of the capacitor voltage on the DC side. The real-time power command of the power network side is fed forward to the DC/DC side. The combined cascade power conversion system model based on the energy storage of lithium battery is established in PSCAD/EMTDC environment. A set of coordinated control strategies are proposed to regulate the normal operating conditions of the device. The simulation results show that the control strategy is effective. The results show that the proposed coordinated control strategy has the advantages of wide voltage matching ability, strong adaptability to battery state, and fast response speed, which can realize large capacity energy storage and bidirectional power regulation. Finally, in order to deal with the problem of SOC imbalance in chain battery energy storage system, the self-equalization control strategy of SOC based on modulation amplitude fine-tuning is studied, and the unbalance of charge state of battery pack is simulated. The effectiveness of the control strategy is verified. In addition, the harmonic analysis of carrier phase shifted SPWM control and SOC self-equalization control are carried out respectively. The results show that the SOC self-equalization control strategy based on the modulation amplitude fine-tuning can reasonably distribute the power regulation carried by each battery pack, make the SOC tend to be consistent, and improve the capacity and availability of the whole power conversion system. However, the harmonic performance of the output voltage will be affected by changing the amplitude of the modulation.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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