本文選題：弱電網(wǎng) + 有源阻尼��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：為了應(yīng)對能源緊缺和環(huán)境問題,基于以風(fēng)能和太陽能為代表的可再生能源的分布式發(fā)電系統(tǒng)迅速崛起,其中作為核心組件的并網(wǎng)逆變器應(yīng)用廣泛�？紤]到處于偏遠(yuǎn)地區(qū)的分布式發(fā)電系統(tǒng),較長的電能傳輸線路以及存在的大量變壓環(huán)節(jié)給電網(wǎng)引入一個不可忽略的等效電網(wǎng)阻抗,致使電網(wǎng)具有弱電網(wǎng)特性。因此,對于與弱電網(wǎng)連接的并網(wǎng)逆變器系統(tǒng),電網(wǎng)阻抗會對其穩(wěn)定性及動態(tài)性能等造成一定影響。為此,本文針對弱電網(wǎng)下的并網(wǎng)逆變器,從電網(wǎng)阻抗檢測技術(shù)、優(yōu)化控制方法等方面提出改善并網(wǎng)逆變器性能的具體措施和控制策略,確保其在弱電網(wǎng)下可靠穩(wěn)定運行。本文主要研究弱電網(wǎng)對并網(wǎng)逆變器性能的影響并提出優(yōu)化策略。首先,對理想電網(wǎng)情況下的三相LCL型并網(wǎng)逆變器進(jìn)行建模與分析,并給出電流控制器及無源阻尼諧振抑制等的參數(shù)設(shè)計方法。接著,構(gòu)建弱電網(wǎng)模型,分析電網(wǎng)阻抗對并網(wǎng)逆變器系統(tǒng)的具體影響,包括電網(wǎng)阻抗對LCL濾波器諧振特性、系統(tǒng)動態(tài)性能和穩(wěn)定性等的影響。然后,論文進(jìn)一步分析相對于無源阻尼抑制諧振更有優(yōu)勢的有源阻尼控制方法,并將并網(wǎng)電流有源阻尼方法應(yīng)用到弱電網(wǎng)下的并網(wǎng)逆變器系統(tǒng)中,用于抑制系統(tǒng)諧振。最后,針對弱電網(wǎng)具有電網(wǎng)阻抗變化的特性,提出一種即時觸發(fā)型阻抗測量方法在線檢測電網(wǎng)阻抗,結(jié)合該阻抗在線檢測技術(shù),行成基于并網(wǎng)電流有源阻尼的并網(wǎng)逆變器的自適應(yīng)控制策略,實時修正電流控制器與有源阻尼控制器的控制參數(shù),使得并網(wǎng)逆變器系統(tǒng)在電網(wǎng)阻抗大范圍變化下穩(wěn)定運行。本文采用MATLAB軟件中SIMULINK工具箱對系統(tǒng)進(jìn)行仿真分析,論證了理論的正確性。為了進(jìn)一步驗證所提理論的有效性,通過設(shè)計硬件電路及編寫系統(tǒng)控制程序,搭建一臺以TMS320F2812為控制芯片的三相LCL型并網(wǎng)逆變器實物平臺,接著在平臺上完成電網(wǎng)阻抗對并網(wǎng)逆變器性能的影響實驗,并驗證論文中所提自適應(yīng)控制策略的正確性和有效性。
[Abstract]:In order to deal with the energy shortage and environmental problems, distributed power generation systems based on renewable energy, such as wind and solar energy, are emerging rapidly, among which grid-connected inverters, as core components, are widely used. Considering the distributed generation system in remote area, the long power transmission line and a large number of transformer links introduce a non-negligible equivalent network impedance to the power network, which leads to the weak network characteristics. Therefore, for grid-connected inverters connected with weak grids, grid impedance will affect its stability and dynamic performance. Therefore, aiming at the grid-connected inverter under the weak electric network, this paper puts forward the concrete measures and control strategies to improve the performance of grid-connected inverter from the aspects of impedance detection technology and optimization control method, so as to ensure its reliable and stable operation under the weak grid. In this paper, the influence of weak grid on the performance of grid-connected inverter is studied and the optimization strategy is proposed. Firstly, the modeling and analysis of three-phase LCL grid-connected inverter under ideal grid condition are carried out, and the parameter design methods of current controller and passive damping resonance suppression are given. Then, a weak grid model is constructed to analyze the influence of grid impedance on grid-connected inverter system, including the influence of grid impedance on resonant characteristics of LCL filter, dynamic performance and stability of the system. Then, the paper further analyzes the active damping control method which has more advantages than the passive damping suppression resonance, and applies the grid-connected current active damping method to the grid-connected inverter system under the weak electric grid, which is used to suppress the system resonance. Finally, in view of the characteristic that the weak electric network has the characteristic of the network impedance change, a kind of real-time trigger type impedance measurement method is put forward to measure the power network impedance on line, combined with the impedance on-line detection technology. The adaptive control strategy of grid-connected inverter based on active damping of grid-connected current is established, and the control parameters of current controller and active damping controller are corrected in real time, so that the grid-connected inverter system can run stably under the condition of wide variation of grid impedance. This paper uses the SIMULINK toolbox of MATLAB software to simulate and analyze the system, and proves the correctness of the theory. In order to further verify the validity of the proposed theory, a physical platform of three-phase LCL grid-connected inverter with TMS320F2812 as the control chip is built by designing the hardware circuit and writing the system control program. Then the influence of grid impedance on the performance of grid-connected inverter is completed on the platform, and the correctness and effectiveness of the adaptive control strategy proposed in this paper are verified.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464

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