本文選題：微電網(wǎng) + 下垂控制��； 參考：《燕山大學(xué)》2014年碩士論文

【摘要】：微電網(wǎng)是在分布式發(fā)電技術(shù)的基礎(chǔ)上發(fā)展起來(lái)的新興電網(wǎng)結(jié)構(gòu)。微電網(wǎng)中的分布式發(fā)電單元和儲(chǔ)能裝置大多通過(guò)接口逆變器與公共耦合點(diǎn)相連，分布式發(fā)電單元的大量接入，形成了微電網(wǎng)中多逆變器的工作環(huán)境。多逆變器環(huán)境下微電網(wǎng)系統(tǒng)孤島運(yùn)行時(shí)由于線路阻抗不匹配、本地負(fù)荷不一致等引起的功率分配和環(huán)流問(wèn)題，嚴(yán)重影響了微電網(wǎng)的運(yùn)行和負(fù)荷的用電安全。為保證并聯(lián)逆變器的穩(wěn)定運(yùn)行，，本文提出了一種基于虛擬電阻的下垂控制策略，采用這種控制策略可以有效抑制環(huán)流、合理分配功率。本文的主要工作如下： 結(jié)合逆變器的功率傳輸特性，分析了各種下垂控制策略的實(shí)現(xiàn)方法和適用范圍，通過(guò)對(duì)P-V下垂控制策略的小信號(hào)建模和穩(wěn)定性分析得出結(jié)論：低壓微電網(wǎng)的傳輸線阻抗環(huán)境下采用P-V下垂控制器更有利于系統(tǒng)的穩(wěn)定運(yùn)行。 針對(duì)低壓微電網(wǎng)孤島運(yùn)行時(shí)，多逆變器環(huán)境下存在的系統(tǒng)環(huán)流問(wèn)題，分析了這種環(huán)流的產(chǎn)生原因，影響因素及其與負(fù)荷功率分配之間的關(guān)系，提出了一種通過(guò)合理分配功率消除系統(tǒng)環(huán)流的控制策略，這種基于虛擬電阻的逆變器并聯(lián)功率控制方案實(shí)現(xiàn)了負(fù)荷功率按微源額定容量比例分配、消除系統(tǒng)環(huán)流的控制目的。對(duì)兩臺(tái)DG并聯(lián)以及多機(jī)并聯(lián)的情況進(jìn)行了仿真，仿真結(jié)果證明了這種改進(jìn)的控制策略的正確性。 本文最后搭建了兩臺(tái)三相逆變器并聯(lián)的實(shí)驗(yàn)平臺(tái)，采用型號(hào)為T(mén)MS320F2812的DSP作為主控制器對(duì)上述控制策略進(jìn)行了驗(yàn)證，實(shí)驗(yàn)結(jié)果證明了該策略的可行性。
[Abstract]:Microgrid is a new power network structure developed on the basis of distributed generation technology. Most of the distributed generation units and energy storage devices in microgrid are connected with common coupling points through interface inverters, and a large number of distributed generating units are connected to each other, forming the working environment of multi-inverter in microgrid. The power distribution and circulation problems caused by line impedance mismatch and local load inconsistency in the isolated island operation of microgrid system in multi-inverter environment have seriously affected the operation of micro-grid and the safety of power consumption. In order to ensure the stable operation of the parallel inverter, a droop control strategy based on virtual resistor is proposed in this paper, which can effectively suppress the circulation and allocate power reasonably. The main work of this paper is as follows: Combined with the power transmission characteristics of the inverter, the realization methods and applicable range of various droop control strategies are analyzed. Through the small signal modeling and stability analysis of P-V droop control strategy, it is concluded that using P-V droop controller in the transmission line impedance environment of low-voltage microgrid is more conducive to the stable operation of the system. In view of the circulation problem in the environment of multi-inverter, the causes of the circulation, the influence factors and the relationship between the circulation and load power distribution are analyzed. This paper presents a control strategy to eliminate the system circulation through reasonable power allocation. This parallel power control scheme based on virtual resistance realizes the load power distribution according to the rated capacity of the micro-source, and eliminates the circulation of the system. The simulation results of two parallel DGs and multiple parallel machines show the correctness of the improved control strategy. In the end, the experiment platform of two three-phase inverters in parallel is built, and the control strategy is verified by DSP with TMS320F2812 as the main controller. The experimental results prove the feasibility of the strategy.
【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(lèi)號(hào)】：TM464

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