【摘要】：在當(dāng)前環(huán)境保護(hù)和能源短缺的壓力下,以太陽能、風(fēng)能作為主要能源的分布式發(fā)電技術(shù)越來越受到重視。然而,由于以太陽能、風(fēng)能為主的分布式發(fā)電的間歇性會對電網(wǎng)運行的穩(wěn)定性造成很大影響,于是微電網(wǎng)作為促進(jìn)分布式發(fā)電友好接入電網(wǎng)的一種技術(shù)手段被提出來用以解決這個問題。雖然近幾年國內(nèi)外學(xué)者對分布式發(fā)電和微電網(wǎng)領(lǐng)域進(jìn)行了不少研究,但在能源管理、規(guī)劃設(shè)計、多級微電網(wǎng)的協(xié)調(diào)控制和應(yīng)用方面的相關(guān)問題尚未解決。因此有必要針對微電網(wǎng)的運行控制技術(shù)進(jìn)行分析和研究。本文的主要內(nèi)容包括:(1)根據(jù)某實際微電網(wǎng)系統(tǒng)的負(fù)荷構(gòu)成及特性,結(jié)合光伏發(fā)電技術(shù)及多元儲能技術(shù),分別設(shè)計了光伏發(fā)電系統(tǒng)、多元復(fù)合儲能系統(tǒng)、負(fù)荷控制系統(tǒng)的模型,為后面研究以光伏發(fā)電系統(tǒng)、多元復(fù)合儲能系統(tǒng)、負(fù)荷控制系統(tǒng)為基礎(chǔ)構(gòu)建的混合交直流多級微電網(wǎng)系統(tǒng)提供了理論支持。(2)分別研究了交流子微電網(wǎng)和直流子微電網(wǎng)的控制策略,提出了一種基于分級自主控制技術(shù)的交直流混合多級微電網(wǎng)協(xié)調(diào)控制策略,實現(xiàn)了交直流混合多級微電網(wǎng)的安全穩(wěn)定、經(jīng)濟(jì)高效運行。同時對多元復(fù)合儲能系統(tǒng)的控制策略進(jìn)行了研究,對整個微電網(wǎng)系統(tǒng)的供電可靠性和運行穩(wěn)定性提供了保證。(3)針對不同運行控制需求,提出了一種含電動汽車充電樁的交直流混合多級微電網(wǎng)多時間尺度能量管理方法,有效的提高了微電網(wǎng)的投資回報率和能源利用效率,達(dá)到了交流微電網(wǎng)和直流微電網(wǎng)優(yōu)勢互補、多級微電網(wǎng)協(xié)調(diào)運行的目標(biāo)。(4)構(gòu)建了微電網(wǎng)系統(tǒng)的仿真模型,提出了考慮峰谷電價的儲能運行控制策略,并對微電網(wǎng)的不同控制策略進(jìn)行分時段實驗。利用直流母線電壓恒定控制策略,針對不同的運行工況,分別進(jìn)行了直流電壓穩(wěn)定性實驗。此外,分別對儲能系統(tǒng)在并網(wǎng)模式和離網(wǎng)模式下的控制策略進(jìn)行了仿真研究,研究結(jié)果表明,該微電網(wǎng)系統(tǒng)的運行控制策略安全穩(wěn)定。
[Abstract]:Under the pressure of environmental protection and energy shortage, distributed power generation technology with solar and wind energy as the main energy has been paid more and more attention. However, the intermittent nature of distributed power generation, which is mainly solar and wind energy, has a great impact on the stability of the power grid. As a technical means to promote distributed generation, microgrid is proposed to solve this problem. Although scholars at home and abroad have done a lot of research in the field of distributed generation and microgrid in recent years, the related problems in energy management, planning and design, coordination control and application of multi-level microgrid have not been solved. Therefore, it is necessary to analyze and study the operation control technology of microgrid. The main contents of this paper are as follows: (1) according to the load composition and characteristics of a practical microgrid system, the photovoltaic power generation system and the multivariate composite energy storage system are designed, which are combined with the photovoltaic power generation technology and the multiple energy storage technology, respectively. The model of the load control system for the latter research is based on photovoltaic power generation system, multivariate composite energy storage system, The load control system provides theoretical support for the hybrid AC / DC multilevel microgrid system. (2) the control strategies of AC sub-microgrid and DC sub-microgrid are studied respectively. This paper presents a coordinated control strategy for AC / DC hybrid multilevel microgrid based on hierarchical autonomous control technology, which realizes the security and stability of AC / DC hybrid multilevel microgrid, and it is economical and efficient. At the same time, the control strategy of multi-element composite energy storage system is studied, which guarantees the power supply reliability and operation stability of the whole micro-grid system. (3) according to the different operation control requirements, In this paper, a multi-time scale energy management method for AC / DC hybrid multistage microgrid with electric vehicle charging piles is proposed, which can effectively improve the return on investment and energy utilization efficiency of microgrid. It achieves the goal of complementary advantages of AC microgrid and DC microgrid and coordinated operation of multi-level microgrid. (4) the simulation model of microgrid system is constructed, and the control strategy of energy storage operation considering peak and valley price is proposed. Experiments on different control strategies of microgrid are carried out in different time intervals. Using DC bus voltage constant control strategy, DC voltage stability experiments are carried out under different operating conditions. In addition, the control strategies of energy storage system in grid-connected mode and off-grid mode are simulated, and the results show that the operation control strategy of the micro-grid system is safe and stable.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM732

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