本文選題：微電網(wǎng)　切入點(diǎn)：改進(jìn)的電壓電流雙環(huán)控制　出處：《南京理工大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：微電網(wǎng)不僅能夠展現(xiàn)和發(fā)揮分布式發(fā)電的優(yōu)點(diǎn),而且可以減小分布式發(fā)電對(duì)電網(wǎng)的沖擊和不利影響,它將地理分散、一次能源多種多樣的分布式電源整合在一個(gè)區(qū)域網(wǎng)絡(luò)里,并對(duì)網(wǎng)絡(luò)內(nèi)的電壓與能量進(jìn)行統(tǒng)一地管理和調(diào)度,成為一種新穎的電力系統(tǒng)組織方式和結(jié)構(gòu)。 論文首先分析了三相全橋逆變器的電路拓?fù)浣Y(jié)構(gòu),然后在此基礎(chǔ)上建立離散的平均狀態(tài)空間模型。在傳統(tǒng)電壓電流雙環(huán)控制方法的基礎(chǔ)上加入無(wú)差拍控制并將負(fù)載電流作為附加指令,提出了一種改進(jìn)的電壓電流雙環(huán)控制策略。通過(guò)仿真驗(yàn)證,改進(jìn)的電壓電流雙環(huán)控制能夠及時(shí)追蹤參考指令,動(dòng)態(tài)響應(yīng)能力快速,并具有良好的穩(wěn)定性。 然后研究了Vf控制器和PQ控制器的設(shè)計(jì)方法,搭建仿真模型并對(duì)參考電壓變化、參考功率變化以及改變負(fù)荷三種情況進(jìn)行仿真,驗(yàn)證了兩種控制器的有效性。除此之外,還對(duì)微電網(wǎng)主從控制策略進(jìn)行建模仿真,得出所設(shè)計(jì)的Vf控制器能夠及時(shí)追蹤參考電壓,保證了離網(wǎng)運(yùn)行時(shí)微電網(wǎng)電壓幅值和頻率穩(wěn)定；在并網(wǎng)運(yùn)行時(shí),分布式電源切換為PQ控制,能夠維持各自輸出功率按設(shè)定值穩(wěn)定運(yùn)行。 接著分析了微電網(wǎng)下垂控制和倒下垂控制原理,并分別建立仿真模型,對(duì)投切負(fù)荷情況進(jìn)行仿真,驗(yàn)證了這兩種控制方法的有效性。然后采用對(duì)等控制對(duì)微電網(wǎng)并／離網(wǎng)兩種運(yùn)行工況以及兩種工況切換進(jìn)行仿真分析,仿真結(jié)果表明所設(shè)計(jì)的控制策略能夠使微電網(wǎng)穩(wěn)定運(yùn)行。 最后針對(duì)傳統(tǒng)下垂控制方法的不足,設(shè)計(jì)了一種基于單神經(jīng)元自適應(yīng)PID控制的改進(jìn)下垂控制器。在此基礎(chǔ)上建立模型并對(duì)投切負(fù)荷情況進(jìn)行仿真,與采用傳統(tǒng)的下垂控制相比,得出了無(wú)論穩(wěn)態(tài)運(yùn)行還是系統(tǒng)發(fā)生擾動(dòng),該下垂控制器均能體現(xiàn)出良好的魯棒性、跟蹤性能和動(dòng)態(tài)響應(yīng)能力。
[Abstract]:Microgrid not only can show and play the advantages of distributed generation, but also can reduce the impact and adverse effects of distributed generation on the grid. And the voltage and energy in the network are managed and dispatching uniformly, which becomes a novel power system organization and structure. Firstly, the circuit topology of three-phase full-bridge inverter is analyzed. Then the discrete average state space model is established. The deadbeat control is added on the basis of the traditional voltage and current double loop control method and the load current is taken as the additional instruction. An improved double loop control strategy for voltage and current is proposed. The simulation results show that the improved double loop control can track the reference instructions in time, and the dynamic response is fast and has good stability. Then, the design method of VF controller and PQ controller is studied, and the simulation model is built, and the reference voltage change, reference power change and load change are simulated to verify the effectiveness of the two controllers. By modeling and simulating the master and slave control strategy of microgrid, it is concluded that the designed VF controller can track the reference voltage in time and ensure the stability of voltage amplitude and frequency in off-grid operation. The distributed power supply is switched to PQ control, which can keep the output power running stably according to the set value. Then, the principle of droop control and inverted droop control of microgrid are analyzed, and the simulation models are established to simulate the load shedding. The effectiveness of these two control methods is verified, and then the simulation analysis of two operating conditions and switching of two operating conditions is carried out by using peer-to-peer control. The simulation results show that the proposed control strategy can make the microgrid run stably. Finally, an improved sagging controller based on single neuron adaptive PID control is designed to overcome the shortcomings of traditional droop control methods. Compared with the traditional droop control, it is concluded that the sagging controller can show good robustness, tracking performance and dynamic response ability, regardless of the steady state operation or the disturbance of the system.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM727

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