【摘要】：分布式發(fā)電(Distributed Generation,DG)以其發(fā)電方式靈活、能源利用率高、環(huán)境污染小等優(yōu)點(diǎn)日益成為傳統(tǒng)電網(wǎng)的有效補(bǔ)充,并網(wǎng)逆變器作為分布式電源與電網(wǎng)的接口,在并網(wǎng)發(fā)電中起著關(guān)鍵作用。本文以并網(wǎng)逆變器為研究對(duì)象,提出了abc自然坐標(biāo)系(Natural Coordinates,NC)、虛擬電機(jī)(Virtual Machine,VM)的概念,通過(guò)對(duì)虛擬電機(jī)磁鏈的準(zhǔn)確觀測(cè),解決分布式電源接入電網(wǎng)時(shí)電壓波動(dòng)和功率因數(shù)不高的問(wèn)題。 與傳統(tǒng)的電壓定向和虛擬磁鏈定向不同,本文所介紹的方法將逆變橋輸出電壓的積分直接看作虛擬電機(jī)磁鏈,逆變橋以外的部分看作虛擬電機(jī),于是,虛擬電機(jī)部分類(lèi)似于一臺(tái)無(wú)限大的、由逆變器供電并以同步速恒速運(yùn)行的同步電機(jī)。同時(shí),建立abc自然坐標(biāo)系下的數(shù)學(xué)模型,提出了基于虛擬電機(jī)模型的分布式發(fā)電并網(wǎng)逆變器的自然坐標(biāo)無(wú)功穩(wěn)壓控制策略和準(zhǔn)直接功率控制(Quasi Direct Power Control,QDPC)策略。兩種方法均在自然坐標(biāo)系下,通過(guò)虛擬電機(jī)磁鏈進(jìn)行定向,abc三相分相獨(dú)立控制,實(shí)現(xiàn)了有功電流和無(wú)功電流的解耦。 最后,通過(guò)Quaser8+dSPACE的半控制器全實(shí)物實(shí)驗(yàn)平臺(tái)進(jìn)行快速實(shí)時(shí)驗(yàn)證。實(shí)驗(yàn)結(jié)果表明,本文所介紹的兩種方法在無(wú)需任何坐標(biāo)變換、無(wú)需鎖相環(huán)節(jié)、無(wú)需交流側(cè)電壓傳感器的條件下均能有效運(yùn)行。VM無(wú)功穩(wěn)壓控制能夠快速、持久的保持交流側(cè)和直流側(cè)電壓的穩(wěn)定；VM-QDPC策略使逆變器運(yùn)行于負(fù)單位功率因數(shù),而且能夠在小范圍內(nèi)實(shí)現(xiàn)完全無(wú)模型控制,克服部分源/荷的不平衡,提高了系統(tǒng)魯棒性。
[Abstract]:Distributed power generation (Distributed Generation,DG) has become an effective supplement to the traditional power grid due to its flexible generation mode, high energy efficiency and low environmental pollution. Grid-connected inverter is the interface between the distributed power supply and the power grid. It plays a key role in grid-connected power generation. Taking grid-connected inverter as the research object, the concepts of abc natural coordinate system (Natural Coordinates,NC) and virtual motor (Virtual Machine,VM) are put forward in this paper. Through the accurate observation of the flux linkage of the virtual motor, The problem of low voltage fluctuation and power factor when distributed power supply is connected to power grid is solved. Different from the traditional voltage orientation and virtual flux orientation, the method introduced in this paper regards the integral of the output voltage of the inverter bridge as the virtual motor flux linkage directly, and the parts other than the inverter bridge as the virtual motor, so the method introduced in this paper regards the integral of the inverter bridge output voltage as the virtual motor. The virtual motor is partly similar to an infinite synchronous motor powered by an inverter and operated at a synchronous speed and constant speed. At the same time, the mathematical model of abc natural coordinate system is established, and the natural coordinate reactive power stabilization control strategy and quasi-direct power control (Quasi Direct Power Control,QDPC strategy of distributed grid-connected inverter based on virtual motor model are proposed. Both methods are oriented by virtual motor flux and controlled independently by abc three-phase separation in natural coordinate system. The decoupling of active current and reactive current is realized. Finally, the rapid and real-time verification is carried out through the hardware-in-the-loop experiment platform of Quaser8 dSPACE. The experimental results show that the two methods presented in this paper can operate effectively without any coordinate transformation, phase locked link and AC side voltage sensor. Maintain the voltage stability of AC side and DC side for a long time; The VM-QDPC strategy makes the inverter run in a negative unit power factor, and can achieve complete model-free control in a small range, overcome the partial source / load imbalance, and improve the robustness of the system.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM464

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