本文選題：三相全橋逆變器　切入點：比例準諧振控制　出處：《哈爾濱工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著電力電子技術(shù)的發(fā)展,由多臺逆變器配合其他發(fā)電設備共同構(gòu)成的低壓交流微網(wǎng)常作為主電網(wǎng)的后備或替代而得到廣泛應用。交流微網(wǎng)中供電設備不連接主電網(wǎng)而獨立工作的模式即孤島微網(wǎng)模式。孤島微網(wǎng)中的不平衡非線性負載會造成電壓畸變供電質(zhì)量降低,因此對逆變器的電壓控制技術(shù)提出了較高的要求。由于失去主電網(wǎng)作為電壓支撐,孤島模式微網(wǎng)中的逆變器需要與其他逆變器或發(fā)電設備共同工作在電壓源模式提供負載電壓,因此需研究逆變器的電壓源并聯(lián)運行技術(shù)。本文針對三相孤島微網(wǎng),分析了微網(wǎng)常用的三相逆變器的拓撲結(jié)構(gòu)與優(yōu)缺點,選擇基于單相獨立控制的三相全橋逆變器作為功率變換器,該拓撲具有母線電壓利用率高的優(yōu)點并能夠有效應對負載不平衡造成的輸出電壓不對稱。針對三相全橋逆變器的單機控制策略,本文分析了大功率下傳統(tǒng)電壓電流雙閉環(huán)控制中電流內(nèi)環(huán)存在的缺陷,并改用電壓單閉環(huán)控制,通過對比單閉環(huán)和雙閉環(huán)的性能提出了控制器的相位補償和增強穩(wěn)定性的要求。在此基礎上,提出一種基于比例準諧振-重復控制并聯(lián)結(jié)構(gòu)的復合控制策略。其中比例準諧振控制通過增加相位超前補償提高基波控制性能,重復控制設計了基于模型對消濾波器的控制策略提高穩(wěn)定性并抑制電壓諧波。針對電壓單閉環(huán)控制缺乏電流環(huán)限流的問題,本文提出一種基于電壓電流幅值檢測的控制器切換策略,實現(xiàn)過流情況下的電流環(huán)限流控制。通過分析無源阻尼對系統(tǒng)模型的影響,采用電容回路無源阻尼增強兩種控制模式下的穩(wěn)定性。對于三相逆變器的并聯(lián)組網(wǎng),本文研究基于無互聯(lián)線的功率下垂控制。通過建立數(shù)學模型分析均功率調(diào)節(jié)過程動態(tài)特性,提出下垂控制的改進策略增加系統(tǒng)穩(wěn)定性。最后,設計以ARM控制芯片STM32F407為核心的三相全橋逆變器實驗硬件平臺并對系統(tǒng)軟件進行編程實驗。在實驗平臺上驗證了所提出控制策有較強的帶不平衡非線性負載的能力且能夠通過兩種控制模式的切換進行限流保護。
[Abstract]:With the development of power electronics technology, Low-voltage AC microgrid, which is composed of several inverters and other generation equipments, is widely used as the backup or substitute of the main grid. The mode in which the power supply equipment in AC microgrid works independently without connecting to the main grid is isolated. Island microgrid mode. The unbalanced nonlinear load in the island microgrid will cause the voltage distortion to reduce the quality of power supply. Therefore, the voltage control technology of the inverter is required. Because of the loss of the main grid as the voltage support, the inverter in the island-mode microgrid needs to work with other inverters or generating equipment to provide the load voltage in the voltage source mode. Therefore, it is necessary to study the voltage source parallel operation technology of the inverter. In this paper, the topology structure, advantages and disadvantages of the three-phase inverter commonly used in micro-grid are analyzed, aiming at the three-phase isolated microgrid. Three-phase full-bridge inverter based on single-phase independent control is selected as power converter. The topology has the advantage of high bus voltage utilization and can effectively deal with the asymmetry of output voltage caused by unbalanced load. The single-machine control strategy for three-phase full-bridge inverter is proposed. In this paper, the defects of the current inner loop in the traditional voltage and current double closed loop control under high power are analyzed, and the voltage single closed loop control is used. By comparing the performance of single closed loop and double closed loop, the requirements of phase compensation and enhanced stability of the controller are put forward. A compound control strategy based on proportional quasi-resonance and repetitive control parallel structure is proposed, in which proportional quasi-resonance control improves fundamental wave control performance by increasing phase advance compensation. The control strategy based on model canceling filter is designed to improve stability and suppress voltage harmonics. In this paper, a controller switching strategy based on voltage and current amplitude detection is proposed to realize current loop current limiting control under overcurrent. The influence of passive damping on the system model is analyzed. The passive damping of capacitor loop is used to enhance the stability of the two control modes. For the three-phase inverter connected in parallel, this paper studies the power droop control based on the non-interconnected wire. The dynamic characteristics of the process of average power regulation are analyzed by establishing a mathematical model. An improved strategy of droop control is proposed to increase the stability of the system. Finally, The experimental hardware platform of three-phase full-bridge inverter with ARM control chip STM32F407 as the core is designed and the system software is programmed. The ability of the proposed control strategy with unbalanced nonlinear load is verified on the experimental platform. And the current limiting protection can be carried out by switching between two control modes.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

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