本文選題：混合下垂控制 + 自同步逆變器　； 參考：《東北大學(xué)》2014年碩士論文

【摘要】：近年來,微電網(wǎng)逆變器并網(wǎng)技術(shù)已成為研究的熱點問題。目前,微電網(wǎng)逆變器的控制方式主要有單模式控制方式和雙模式控制方式。單模式控制方法能夠?qū)崿F(xiàn)微電網(wǎng)并網(wǎng)和非計劃離網(wǎng)的無縫切換,避免了雙模式控制方式可能帶來的模式切換失敗的風(fēng)險。傳統(tǒng)的下垂控制能夠?qū)崿F(xiàn)單模式控制,但是由于下垂控制在孤島運行時輸出電壓幅值、頻率與額定值存在偏差,此時不允許直接并網(wǎng)操作,需要采用鎖相環(huán)技術(shù)進行準(zhǔn)同期控制。針對傳統(tǒng)下垂控制存在的不足,本文在傳統(tǒng)下垂控制的基礎(chǔ)上提出了一種混合下垂自同步控制方法,能夠使系統(tǒng)頻率保持恒定,無需鎖相環(huán)準(zhǔn)同期控制過程可直接進行并網(wǎng)操作,完全實現(xiàn)“即插即用”。首先,本文介紹了不同坐標(biāo)系下的下垂控制方法的實現(xiàn),分析和比較三環(huán)下垂控制和單環(huán)下垂控制的特點,對逆變器準(zhǔn)同期并網(wǎng)控制策略進行分析。其次,對本文所提出的自同步控制方法進行分析并運用小信號分析法建立微電網(wǎng)逆變器在并網(wǎng)和離網(wǎng)模型下的小信號模型,根據(jù)系統(tǒng)的狀態(tài)空間方程畫出系統(tǒng)的根軌跡圖,并對系統(tǒng)的特征根軌跡進行分析,確定影響系統(tǒng)的主要控制參數(shù),為選擇系統(tǒng)控制參數(shù)提供理論依據(jù)。利用反步控制法對非線性輔助電壓控制器進行設(shè)計,使得系統(tǒng)在并網(wǎng)和離網(wǎng)過程中能夠平滑過渡,同時提高系統(tǒng)抗干擾能力。選擇仿真系統(tǒng)的主回路及控制器相關(guān)參數(shù),使用MATLAB/SIMULINK搭建系統(tǒng)仿真模型。對系統(tǒng)在獨立、并聯(lián)孤島、并網(wǎng)、非計劃性離網(wǎng)模式下運行以及負(fù)載突變等情況進行仿真,并對仿真結(jié)果進行分析,驗證了自同步控制方法合理性和可行性。最后,為了進一步驗證本文提出自同步控制方法的正確性,搭建了以DSP F2812為控制核心的實驗平臺,對整個系統(tǒng)的軟件和硬件進行設(shè)計,使用C語言編寫控制系統(tǒng)的軟件程序。從系統(tǒng)實際運行時的數(shù)據(jù)和實驗波形來看,所提出的自同步控制方法達(dá)到了很好的控制效果。
[Abstract]:In recent years, the grid connected technology of microgrid inverter has become a hot issue in the research. At present, the control mode of the micro grid inverter mainly includes single mode control mode and double mode control mode. The single mode control method can realize seamless switching of the micro grid connected with the unplanned off network, and avoid the possible mode of the dual mode control mode. The traditional droop control can realize single mode control, but due to the droop control output voltage amplitude in the island running, there is a deviation between the frequency and the rated value. At this time, the direct grid operation is not allowed, and the phase-locked loop technology is needed to carry out the quasi synchronization control. On the basis of the droop control, a hybrid droop self synchronization control method is proposed, which can keep the frequency of the system constant, without the need of the phase locked loop quasi synchronization control process to be directly connected to the network operation, and fully realize "plug and play". First, this paper introduces the implementation of the droop control method under different coordinate systems, analyzes and compares the three rings. The characteristics of droop control and single ring droop control are analyzed. Secondly, the control strategy of quasi synchronous grid is analyzed. Secondly, the self synchronization control method proposed in this paper is analyzed and small signal analysis is used to establish the small signal mode of the micro grid inverter under the grid connected and off network model, and the system is used to draw the system according to the state space equation. The root locus of the system is analyzed, the main control parameters of the system are determined, and the theoretical basis is provided to select the control parameters of the system. The backstepping control method is used to design the nonlinear auxiliary voltage controller, which makes the system smooth transition in the network and off network process, and improves the anti-interference of the system. Ability. Select the main circuit of the simulation system and the related parameters of the controller, build the system simulation model using MATLAB/SIMULINK, simulate the system in independent, parallel isolated island, grid, unplanned off network mode and load mutation, and analyze the simulation results, and verify the rationality and feasibility of the self synchronization control method. Finally, in order to further verify the correctness of the proposed self synchronization control method, an experimental platform with DSP F2812 as the control core is built, the software and hardware of the whole system are designed, and the software program of the control system is written in C language. From the data and experimental waveform of the actual operation of the system, the proposed self synchronization is proposed. The control method has achieved good control effect.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464

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