本文選題：交直流混合微電網(wǎng) + 直流母線電壓控制��； 參考：《天津大學(xué)》2014年博士論文

【摘要】：交直流混合微電網(wǎng)中同時(shí)含有交流和直流母線，，可充分接納不同類型分布式電源及儲(chǔ)能系統(tǒng)，利用較少的能量變換裝置分別滿足直流和交流負(fù)荷需求，整個(gè)系統(tǒng)具備較高的能量轉(zhuǎn)換效率、經(jīng)濟(jì)性和可靠性。穩(wěn)定運(yùn)行控制一直是微電網(wǎng)領(lǐng)域內(nèi)的研究熱點(diǎn)，本文圍繞交直流混合微電網(wǎng)穩(wěn)定控制的相關(guān)技術(shù)進(jìn)行深入細(xì)致的研究，主要工作如下： （1）針對(duì)基于公共直流母線的分布式電源供電系統(tǒng)，研究了基于雙向DC-AC變流器和基于雙向DC-DC變流器的兩種直流母線電壓控制方式，提出諸如基于功率平衡及一階微分環(huán)節(jié)相結(jié)合的改進(jìn)電壓環(huán)前饋補(bǔ)償方法，DC-AC電流環(huán)死區(qū)補(bǔ)償及DC-DC電流環(huán)穩(wěn)態(tài)占空比補(bǔ)償?shù)冉鉀Q措施。理論分析和實(shí)驗(yàn)結(jié)果均表明所提方法能有效抑制大擾動(dòng)下直流母線電壓沖擊和波動(dòng)，保證暫態(tài)時(shí)分布式電源供電系統(tǒng)功率動(dòng)態(tài)平衡。 （2）探討了交直流混合微電網(wǎng)中直流母線電壓控制問題，提出了基于非線性干擾觀測(cè)器的直流母線電壓控制方法。此外本文還詳細(xì)分析了直流線路阻抗、直流母線電容量變化及直流側(cè)DC-DC控制系統(tǒng)對(duì)所提出的直流母線控制方法的影響。理論分析和實(shí)驗(yàn)結(jié)果表明非線性干擾觀測(cè)器的應(yīng)用不僅能有效抑制暫態(tài)直流母線電壓沖擊，還可避免直流微電網(wǎng)中分布式電源的DC-DC控制系統(tǒng)和交直流微電網(wǎng)接口DC-AC控制系統(tǒng)間的高速通信，有利于直流微電網(wǎng)內(nèi)分布式電源的擴(kuò)展和即插即用。 （3）為減小微電網(wǎng)并網(wǎng)與獨(dú)立運(yùn)行模式快速切換過程對(duì)微電網(wǎng)內(nèi)分布式電源及重要負(fù)荷的暫態(tài)沖擊，本文提出一種實(shí)現(xiàn)微電網(wǎng)兩種運(yùn)行模式平滑切換的主逆變電源控制策略。該策略包含主電源變流器控制狀態(tài)平滑切換補(bǔ)償算法和切換控制邏輯。理論分析和實(shí)驗(yàn)結(jié)果表明，該方法可以有效抑制切換過程中出現(xiàn)過壓或過流現(xiàn)象，實(shí)現(xiàn)微電網(wǎng)運(yùn)行狀態(tài)的平滑過渡。 （4）利用特征值理論深入分析和研究了主從控制模式下微電網(wǎng)獨(dú)立運(yùn)行時(shí)的穩(wěn)定性問題。比較基于連續(xù)時(shí)間狀態(tài)方程和離散時(shí)間狀態(tài)方程兩種建模方法對(duì)微電網(wǎng)穩(wěn)定性分析的影響；分析了導(dǎo)致系統(tǒng)出現(xiàn)高頻振蕩失穩(wěn)的主要影響因素；提出在主電源電壓環(huán)電壓反饋通道中加入基于二階通用積分器的帶通濾波器，能有效改善微電網(wǎng)的穩(wěn)定性。
[Abstract]:The AC / DC hybrid microgrid contains both AC and DC bus, which can fully accept different types of distributed power generation and energy storage system, and use less energy conversion devices to meet the demand of DC and AC load, respectively. The whole system has high energy conversion efficiency, economy and reliability. Stable operation control has always been a research hotspot in the field of microgrid. This paper focuses on the related technologies of AC / DC hybrid microgrid stability control. The main work is as follows: 1) aiming at the distributed power supply system based on common DC bus, this paper studies two kinds of DC bus voltage control methods based on bidirectional DC-AC converter and bidirectional DC-DC converter. For example, an improved voltage loop feedforward compensation method based on power balance and first-order differential link is proposed to compensate DC-AC current loop dead-time and DC-DC current loop steady-state duty cycle compensation. The theoretical analysis and experimental results show that the proposed method can effectively suppress the DC bus voltage impulse and fluctuation under large disturbance and ensure the dynamic balance of power in the distributed power supply system during transient. 2) the DC bus voltage control problem in AC / DC hybrid microgrid is discussed, and a DC bus voltage control method based on nonlinear disturbance observer is proposed. In addition, the influence of DC line impedance, DC busbar capacitance change and DC side DC-DC control system on the proposed DC bus control method is analyzed in detail. The theoretical analysis and experimental results show that the nonlinear disturbance observer can not only effectively suppress the transient DC bus voltage impulse, It can also avoid the high speed communication between the DC-DC control system of distributed generation in DC microgrid and the DC-AC control system of AC / DC microgrid interface, which is beneficial to the expansion and plug and play of distributed generation in DC microgrid. 3) in order to reduce the transient impact of the fast switching process of microgrid grid-connected and independent operation mode on distributed generation and important load in microgrid, this paper proposes a main inverter power supply control strategy to realize smooth switching between two operation modes of microgrid. The strategy includes the control state smooth switching compensation algorithm and switching control logic of the main power converter. Theoretical analysis and experimental results show that this method can effectively suppress overvoltage or overcurrent in the switching process and realize smooth transition of the operation state of microgrid. 4) the stability of microgrid under master-slave control mode is analyzed and studied by using eigenvalue theory. The influence of two modeling methods based on continuous time state equation and discrete time state equation on the stability analysis of microgrid is compared, and the main influencing factors that lead to the instability of high frequency oscillation in the system are analyzed. A bandpass filter based on the second order general integrator is proposed to improve the stability of the microgrid in the main supply voltage loop voltage feedback channel.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM732

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