本文選題：直接功率控制 + 預(yù)測(cè)功率控制　； 參考：《燕山大學(xué)》2014年碩士論文

【摘要】：隨著社會(huì)與經(jīng)濟(jì)的高速發(fā)展，常規(guī)能源日趨緊缺，大力發(fā)展風(fēng)能等可再生能源是可持續(xù)能源戰(zhàn)略發(fā)展的必然趨勢(shì)。風(fēng)力發(fā)電系統(tǒng)中，雙饋感應(yīng)發(fā)電機(jī)（DFIG）由于成本低、體積小，不存在永磁材料中的退磁隱患等原因成為風(fēng)電系統(tǒng)中的主流機(jī)型。近年來(lái)，直接功率控制（DPC）因?yàn)榭刂坪?jiǎn)單、解耦性好、動(dòng)態(tài)響應(yīng)快、魯棒性強(qiáng)等優(yōu)點(diǎn)越來(lái)越受到關(guān)注。本論文對(duì)DFIG系統(tǒng)的預(yù)測(cè)直接功率控制（P-DPC）做了研究，研究的主要內(nèi)容概括如下： 本文將DFIG的控制分為網(wǎng)側(cè)變換器（GSC）控制和轉(zhuǎn)子側(cè)變換器（RSC）控制兩個(gè)單獨(dú)的部分。首先，介紹了傳統(tǒng)查表法直接功率控制（LUT-DPC），這種方法控制結(jié)構(gòu)簡(jiǎn)單、動(dòng)態(tài)響應(yīng)快，但是電流諧波含量大，開(kāi)關(guān)頻率不固定。針對(duì)這個(gè)問(wèn)題，預(yù)測(cè)直接功率控制對(duì)傳統(tǒng)直接功率控制做了改進(jìn)，本文分別研究了三矢量預(yù)測(cè)直接功率控制（TV-PDPC）和預(yù)測(cè)功率優(yōu)化控制（PPOC），這兩種方法都是以有功和無(wú)功功率誤差最小為目標(biāo)函數(shù)進(jìn)行控制，TV-PDPC直接計(jì)算空間電壓矢量的作用時(shí)間，而PPOC則計(jì)算SVPWM的最優(yōu)空間矢量來(lái)實(shí)現(xiàn)控制目標(biāo)。這兩種預(yù)測(cè)控制都大大減小了電網(wǎng)電流的諧波含量，，實(shí)現(xiàn)了開(kāi)關(guān)頻率的固定。對(duì)于DFIG的并網(wǎng)控制，采用直接虛功率控制（DVPC），該方法利用虛擬的有功無(wú)功功率代替并網(wǎng)前恒定為零的定子有功無(wú)功功率，形成反饋通道。該方法定子電壓與電網(wǎng)電壓能很快同步，并網(wǎng)過(guò)程平滑，定轉(zhuǎn)子基本無(wú)沖擊電流，滿足軟并網(wǎng)的要求。 電網(wǎng)電壓不平衡時(shí)，有功無(wú)功功率雖然能保持恒定，但是此時(shí)電流諧波含量大，不符合電網(wǎng)相關(guān)規(guī)定。本文針對(duì)不平衡電網(wǎng)條件下的直接功率控制，改進(jìn)了算法。這種改進(jìn)方法控制簡(jiǎn)單，只需要提取負(fù)序電壓與正序電流，避免了提取負(fù)序電流，不需要改變控制結(jié)構(gòu)，可以與電網(wǎng)電壓平衡時(shí)共用一套控制結(jié)構(gòu)。 最后，通過(guò)MATLAB/Simulik仿真軟件和dSPACE實(shí)驗(yàn)平臺(tái)對(duì)以上理論分析以及控制策略進(jìn)行了仿真和部分實(shí)驗(yàn)驗(yàn)證，仿真和實(shí)驗(yàn)結(jié)果表明所提到的預(yù)測(cè)直接功率控制具有良好的穩(wěn)、動(dòng)態(tài)性能，驗(yàn)證了所研究算法的正確性和可行性。
[Abstract]:With the rapid development of society and economy, conventional energy is becoming increasingly scarce. It is an inevitable trend of sustainable energy strategy to develop renewable energy such as wind energy. In wind power system, doubly-fed induction generator (DFIGG) has become the mainstream type of wind power system because of its low cost, small volume and no hidden danger of demagnetization in permanent magnet materials. In recent years, direct power control (DPC) has attracted more and more attention because of its simple control, good decoupling, fast dynamic response and strong robustness. In this paper, the predictive direct power control (P-DPC) of DFIG system is studied. The main contents of the study are summarized as follows: in this paper, the DFIG control is divided into two separate parts: grid-side converter / GSC-control and rotor-side converter / RSC-control. First of all, the traditional direct power control (DPC) based on look-up table method is introduced. The control structure is simple, the dynamic response is fast, but the current harmonic content is large and the switching frequency is not fixed. In order to solve this problem, predictive direct power control improves the traditional direct power control. In this paper, the three vector predictive direct power control (TV-PDPC) and the predictive power optimal control (PPOCPC) are studied respectively. These two methods take the minimum error of active and reactive power as the objective function to control TV-PDPC to calculate the working time of space voltage vector directly. PPOC computes the optimal space vector of SVPWM to achieve the control objective. These two predictive controls can greatly reduce the harmonic content of power network current and realize the fixed switching frequency. For the grid-connected control of DFIG, direct virtual power control is used to control DVPC.virtual active and reactive power is used instead of zero stator active and reactive power to form feedback channel. This method can synchronize the stator voltage with the grid voltage quickly, the process of grid connection is smooth, the stator and rotor have no impulse current, so it can meet the requirement of soft grid connection. When the voltage is unbalanced, the active power and reactive power can be kept constant, but the current harmonic content is large, which does not conform to the relevant regulations of the power network. In this paper, the algorithm is improved for direct power control under unbalanced power system. This improved method is simple to control, only needs to extract negative sequence voltage and positive sequence current, avoids extracting negative sequence current, does not need to change the control structure, and can share a set of control structure with power grid voltage balance. Finally, through MATLAB / Simulik simulation software and DSpace experimental platform, the theoretical analysis and control strategy are simulated and some experimental results are given. The simulation and experimental results show that the proposed predictive direct power control has good stability and dynamic performance. The correctness and feasibility of the proposed algorithm are verified.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM315;TM46

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