本文選題：網(wǎng)側(cè)變流器　切入點(diǎn)：電網(wǎng)不平衡　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在世界各國大力發(fā)展的眾多可再生能源中，風(fēng)能因其儲量大、分布面廣等優(yōu)良特性，受到了人們的廣泛關(guān)注。我國風(fēng)能資源主要集中于沿海與內(nèi)蒙古等邊疆地區(qū)，距離負(fù)荷中心較遠(yuǎn)，風(fēng)場電網(wǎng)電壓易出現(xiàn)波動、不平衡等狀態(tài)。因此本文針對電網(wǎng)不平衡狀態(tài)下基于雙饋感應(yīng)發(fā)電機(jī)(DFIG)的風(fēng)力發(fā)電系統(tǒng)網(wǎng)側(cè)變流器的控制策略進(jìn)行了深入研究。 本文首先介紹了電網(wǎng)同步技術(shù)，電網(wǎng)同步技術(shù)是DFIG風(fēng)力發(fā)電系統(tǒng)實(shí)現(xiàn)并網(wǎng)運(yùn)行需要解決的關(guān)鍵技術(shù)之一，其檢測的準(zhǔn)確性直接影響DFIG風(fēng)力發(fā)電系統(tǒng)控制策略運(yùn)行的效果。文中詳細(xì)分析了2階廣義積分器鎖頻環(huán)的原理，將其應(yīng)用于電網(wǎng)不平衡條件下電網(wǎng)電壓頻率的檢測及正負(fù)序分量的分離。此外，對雙2階廣義積分器鎖頻環(huán)進(jìn)行改進(jìn)，為其增加相位功能，并對其進(jìn)行了仿真與實(shí)驗(yàn)分析。 其次，對DFIG風(fēng)力發(fā)電系統(tǒng)網(wǎng)側(cè)變流器的模型及控制策略進(jìn)行了分析研究。長期以來網(wǎng)側(cè)變流器運(yùn)行主要應(yīng)用矢量控制，近年來直接功率控制以其控制結(jié)構(gòu)簡單、動態(tài)響應(yīng)性能好等優(yōu)點(diǎn)而受到越來越多的研究。本文分析了電網(wǎng)平衡及不平衡條件下網(wǎng)側(cè)變流器的數(shù)學(xué)模型與基于滑模變結(jié)構(gòu)的直接功率控制(SMC-DPC)策略，并詳細(xì)介紹了滑�？刂破鞯脑O(shè)計。在電網(wǎng)不平衡條件下，根據(jù)網(wǎng)側(cè)變流器的運(yùn)行狀態(tài)設(shè)置了不同控制目標(biāo)，并應(yīng)用SMC-DPC對變流器進(jìn)行了整流與逆變仿真與實(shí)驗(yàn)。除此之外，文中還通過仿真與實(shí)驗(yàn)對比分析了矢量控制與SMC-DPC。 最后，，本文詳細(xì)介紹了網(wǎng)側(cè)變流器的硬件電路設(shè)計與dSPACE實(shí)時仿真系統(tǒng)，并給出了電網(wǎng)平衡、不平衡條件下電網(wǎng)同步實(shí)驗(yàn)和變流器整流與逆變實(shí)驗(yàn)的波形圖。通過實(shí)驗(yàn)研究驗(yàn)證了本文采用的電網(wǎng)同步算法與控制策略的正確性和有效性。
[Abstract]:Among the many renewable energy sources vigorously developed in the world, wind energy has attracted extensive attention because of its excellent characteristics such as large reserves and wide distribution. Wind energy resources in China are mainly concentrated in the coastal areas, Inner Mongolia and other frontier areas. Because of the distance from load center, the voltage of wind field is prone to fluctuate and unbalance, so the control strategy of grid-side converter of wind power system based on doubly-fed induction generator (DFIGG) is studied in this paper. This paper first introduces the power grid synchronization technology, which is one of the key technologies to be solved for the DFIG wind power system to realize grid-connected operation. The accuracy of the detection directly affects the effect of the control strategy operation of DFIG wind power system. The principle of the frequency locking loop of the second order generalized integrator is analyzed in detail in this paper. It is applied to the detection of the voltage frequency and the separation of the positive and negative sequence components under the unbalanced condition of the power network. In addition, the frequency locking loop of the two-order generalized integrator is improved to increase the phase function, and the simulation and experimental analysis are carried out. Secondly, the model and control strategy of grid-side converter of DFIG wind power system are analyzed and studied. For a long time, vector control is mainly used in the operation of grid-side converter. In recent years, direct power control is simple with its control structure. In this paper, the mathematical model of grid-side converter and SMC-DPC-based direct power control strategy based on sliding mode variable structure are analyzed. The design of sliding mode controller is introduced in detail. Under the condition of unbalanced power network, different control targets are set according to the operating state of the grid-side converter, and the rectifier and inverter are simulated and tested by SMC-DPC. The vector control and SMC-DPC are compared and analyzed by simulation and experiment. Finally, the hardware circuit design and dSPACE real-time simulation system of grid-side converter are introduced in detail, and the power network balance is given. The waveform diagram of the power network synchronization experiment and the rectifier and inverter experiment under unbalanced conditions is presented. The correctness and effectiveness of the proposed synchronization algorithm and control strategy are verified by experimental research.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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