本文選題：并網(wǎng)逆變器　切入點(diǎn)：主動(dòng)移頻　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來，隨著能源和環(huán)境問題日益加劇，新能源的開發(fā)和利用在當(dāng)前備受關(guān)注。分布式發(fā)電系統(tǒng)給電力系統(tǒng)的結(jié)構(gòu)和運(yùn)行帶來了很大的改變。孤島效應(yīng)和孤島檢測(cè)方法成為了電力系統(tǒng)安全穩(wěn)定運(yùn)行的關(guān)鍵。 并網(wǎng)逆變器是分布式發(fā)電系統(tǒng)接入電網(wǎng)的核心部分。本文首先對(duì)并網(wǎng)逆變器的拓?fù)浜涂刂品椒ㄗ隽烁攀�，分別對(duì)單相、三相并網(wǎng)逆變器建模和閉環(huán)控制系統(tǒng)進(jìn)行設(shè)計(jì)，并仿真驗(yàn)證了并網(wǎng)效果。 其次分析了單相孤島檢測(cè)方法中的主動(dòng)移頻法、帶正反饋的主動(dòng)移頻法以及周期性正反饋的主動(dòng)移頻法的原理，對(duì)于三相移頻法，是通過無(wú)功電流的擾動(dòng)，，來實(shí)現(xiàn)對(duì)PCC頻率的偏移，并對(duì)以上各方法做了仿真分析。 然后分析了電壓正反饋法的不足，提出了單相自適應(yīng)電壓正反饋法，通過反饋系數(shù)的自適應(yīng)變換，提高了檢測(cè)速度，還提出了基于dq變換的電壓標(biāo)幺值正反饋的方法。同時(shí)，針對(duì)電網(wǎng)電壓幅值不平衡情況，對(duì)負(fù)序電壓正反饋法做了分析，并引入變系數(shù)，通過跟隨電流給定值變化而不斷變換反饋系數(shù)，使其能快速檢測(cè)孤島。 最后，本文采用三相半橋逆變器作為主電路以及TMS320F2812作為控制電路主芯片，設(shè)計(jì)了整個(gè)系統(tǒng)硬件。使用C語(yǔ)言編程進(jìn)行樣機(jī)調(diào)試，完成了三相獨(dú)立模式逆變器的雙閉環(huán)，軟件鎖相環(huán)，三相并網(wǎng)逆變器的電流控制以及孤島檢測(cè)的過/欠壓保護(hù)、電壓標(biāo)幺值正反饋法和負(fù)序電壓正反饋法的實(shí)驗(yàn)。
[Abstract]:In recent years, with the energy and environmental problems become more and more serious, the development and utilization of new energy has attracted much attention in the current. The distributed power generation system has brought great changes to the structure and operation of the power system. Islanding and islanding detection method has become the key to the safe and stable operation of power system.
Grid connected inverter is the core part of the distributed generation system to connect to the power grid. Firstly, the topology and control method of grid connected inverter are summarized. The modeling and closed loop control system of single-phase and three phase grid connected inverter is designed, and the effect of grid connected is verified by simulation.
Secondly, the active frequency shift method of single-phase islanding detection method, active displacement principle of active frequency drift method frequency method and periodic positive feedback with positive feedback, the three-phase frequency shift method, by disturbing the reactive current, to achieve frequency offset on PCC, and the above parties do simulation and analysis.
Then analyzed the voltage positive feedback method, proposed adaptive single-phase voltage positive feedback method, the adaptive transform feedback coefficient, improve detection speed, also proposed the method of voltage dq transform p.u.inductance based on positive feedback. At the same time, according to the power grid voltage unbalance, negative sequence voltage positive feedback method do the analysis, and the introduction of variable coefficients, by following the current setting value changes and continue to transform the feedback coefficients so that it can quickly detect the island.
Finally, this paper adopts three-phase half bridge inverter as the main circuit and the TMS320F2812 chip as the main control circuit, the hardware design of the whole system. The use of C language programming debugging the prototype, completed a double loop three-phase independent mode inverter, software phase-locked loop, current control and islanding detection for three-phase grid connected inverter over / under voltage protection, positive experiment feedback and negative sequence voltage positive feedback method voltage per unit value.

【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)】：TM464

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