本文選題：直流微電網(wǎng)　切入點(diǎn)：建模　出處：《華北電力大學(xué)》2014年碩士論文

【摘要】：能源危機(jī)促進(jìn)了可再生分布式發(fā)電的迅速發(fā)展。為了減小分布式電源直接并網(wǎng)對(duì)電能質(zhì)量的影響，通常將各種分布式發(fā)電裝置有機(jī)結(jié)合組成微電網(wǎng)，然后并入主電網(wǎng)。交流微電網(wǎng)是目前主流的微電網(wǎng)形式，但是直流負(fù)荷的增加和直流分布式電源規(guī)�；o交流微電網(wǎng)帶來(lái)了許多問題。將直流負(fù)荷和分布式電源直接接入直流微電網(wǎng)的形式在成本投資、電能質(zhì)量以及可控性等方面都有很大的優(yōu)勢(shì)，借助電力電子技術(shù)可以實(shí)現(xiàn)對(duì)直流微電網(wǎng)的靈活控制，，充分發(fā)揮直流微電網(wǎng)的優(yōu)勢(shì)。 本文深入分析了直流微電網(wǎng)的構(gòu)成和微電源接口電路的原理與控制方式，在Matlab/Simulink環(huán)境下構(gòu)建了并網(wǎng)型直流微電網(wǎng)模型。針對(duì)光伏發(fā)電系統(tǒng)，提出了指數(shù)型變步長(zhǎng)擾動(dòng)觀察法的MPPT控制策略和恒壓控制策略，建立了光伏發(fā)電系統(tǒng)模型；在蓄電池DC/DC接口控制方面，提出了充放電控制策略，實(shí)現(xiàn)了蓄電池雙向充放電控制；在此基礎(chǔ)上接入了小功率直驅(qū)式風(fēng)力發(fā)電機(jī)仿真模型，使研究的直流微電網(wǎng)更具實(shí)用性。 針對(duì)光伏直流微電網(wǎng)提出了協(xié)調(diào)電壓控制策略。直流微電網(wǎng)無(wú)需考慮頻率和相位問題，以直流母線電壓為衡量系統(tǒng)穩(wěn)定的唯一指標(biāo)，因此控制直流母線電壓穩(wěn)定顯得尤為重要。按照穩(wěn)壓源的不同將直流微電網(wǎng)分為三種基本運(yùn)行狀態(tài)，依據(jù)直流母線電壓與蓄電池荷電狀態(tài)SOC%(State of Charge)對(duì)三種狀態(tài)間的轉(zhuǎn)換進(jìn)行控制，實(shí)現(xiàn)了直流微電網(wǎng)電壓穩(wěn)定控制的同時(shí)也達(dá)到了能量管理的目的。然后將小功率風(fēng)力發(fā)電機(jī)接入直流微電網(wǎng)，實(shí)現(xiàn)了風(fēng)光儲(chǔ)直流微電網(wǎng)的電壓控制，考慮了風(fēng)機(jī)在夜間與白天參與穩(wěn)壓控制時(shí)投入的優(yōu)先級(jí)不同。最后做了仿真模擬，結(jié)果表明提出的協(xié)調(diào)電壓控制策略能夠保證直流微電網(wǎng)的穩(wěn)定運(yùn)行和各狀態(tài)的無(wú)縫切換。
[Abstract]:The energy crisis has promoted the rapid development of renewable distributed generation. In order to reduce the influence of direct grid connection of distributed generation on power quality, a variety of distributed generation devices are usually combined to form microgrid. And then into the main grid. Ac microgrid is the mainstream microgrid form. However, the increase of DC load and the scale of DC distributed generation bring many problems to AC microgrid. The direct connection of DC load and distributed power source to DC microgrid is invested in the cost. Power quality and controllability have great advantages. With the help of power electronics technology, we can realize the flexible control of DC microgrid and give full play to the advantages of DC microgrid. In this paper, the composition of DC microgrid and the principle and control mode of micro-power interface circuit are deeply analyzed. The grid-connected DC micro-grid model is constructed under Matlab/Simulink environment. The MPPT control strategy and constant voltage control strategy of exponential variable step-size disturbance observation method are proposed, and the photovoltaic system model is established, and the charging and discharging control strategy is put forward in the aspect of battery DC/DC interface control, and the bidirectional charging and discharging control of battery is realized. On this basis, the simulation model of low-power direct-drive wind turbine is connected, which makes the DC microgrid more practical. A coordinated voltage control strategy is proposed for photovoltaic DC microgrid, which takes DC bus voltage as the only index to measure the stability of the system without considering the frequency and phase. Therefore, it is very important to control the voltage stability of DC bus. According to the different voltage sources, the DC microgrid is divided into three basic operating states, and the conversion between the three states is controlled according to the DC bus voltage and the charging state of the battery SOC%(State of charge. The voltage stability control of DC microgrid is realized and the purpose of energy management is achieved. Then the low-power wind turbine is connected to DC micro-grid to realize the voltage control of wind-storage DC micro-grid. Considering the different priority of blower input in the night and daytime, the simulation results show that the proposed coordinated voltage control strategy can ensure the stable operation of DC microgrid and seamless switching of different states.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM61

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