本文選題：并網(wǎng)逆變器 + 電流控制��； 參考：《中國電機(jī)工程學(xué)報(bào)》2017年18期

【摘要】：由電網(wǎng)不對(duì)稱故障等因素引起的不對(duì)稱電壓會(huì)對(duì)并網(wǎng)逆變器的正常運(yùn)行產(chǎn)生不利影響�？刂撇⒕W(wǎng)逆變器向電網(wǎng)中注入適當(dāng)?shù)呢?fù)序電流,對(duì)提高逆變器對(duì)異常電網(wǎng)電壓尤其是不對(duì)稱電壓的耐受能力和持續(xù)運(yùn)行能力具有重要意義。該文提出一種執(zhí)行于雙同步旋轉(zhuǎn)坐標(biāo)系下的采用復(fù)系數(shù)比例積分控制器的不對(duì)稱電流控制方法。該方法能夠快速和無靜差地控制正序和負(fù)序正弦交流信號(hào)。該控制方法無需分解和提取電網(wǎng)電流的正負(fù)序分量,控制結(jié)構(gòu)相對(duì)簡(jiǎn)單,且該方法能夠同時(shí)對(duì)正序和負(fù)序直軸和交軸電流實(shí)現(xiàn)近似解耦控制。同時(shí),在控制器的參數(shù)設(shè)計(jì)中考慮并補(bǔ)償數(shù)字控制延時(shí)的影響,從而使得所提控制方法在低開關(guān)和采樣頻率下能夠獲得良好的穩(wěn)定性和動(dòng)態(tài)性能。在開關(guān)頻率為2kH z的樣機(jī)上對(duì)所提方法進(jìn)行實(shí)驗(yàn)研究,實(shí)驗(yàn)結(jié)果驗(yàn)證了該控制方法的可行性及其性能。
[Abstract]:The asymmetric voltage caused by the asymmetrical fault of the power network will adversely affect the normal operation of the grid-connected inverter. It is of great significance to control the grid connected inverter to inject appropriate negative sequence current into the power network, which is of great significance to improve the endurance and continuous operation ability of the inverter to abnormal grid voltage, especially to asymmetric voltage. In this paper, an asymmetric current control method based on a proportional integral controller with complex coefficients is proposed, which is implemented in a double synchronous rotating coordinate system. This method can control sinusoidal and negative sinusoidal AC signals quickly and without static error. The control method does not need to decompose and extract the positive and negative sequence components of the power network current, and the control structure is relatively simple, and the method can achieve approximate decoupling control of the positive and negative sequence direct and cross axis currents simultaneously. At the same time, the effect of digital control delay is considered and compensated in the controller parameter design, so that the proposed control method can obtain good stability and dynamic performance at low switching and sampling frequency. The proposed method is experimentally studied on a prototype with a switching frequency of 2kHz. The experimental results verify the feasibility and performance of the proposed control method.
【作者單位】： 電力設(shè)備電氣絕緣國家重點(diǎn)實(shí)驗(yàn)室(西安交通大學(xué));
【基金】：電力設(shè)備與電氣絕緣國家重點(diǎn)室項(xiàng)目(EIPE14112,EIPE16310)~~
【分類號(hào)】：TM464;TM761

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本文編號(hào)：2027420