【摘要】：分布式發(fā)電是可再生能源發(fā)展的重要途徑之一,而微電網(wǎng)是集成分布式可再生能源發(fā)電的重要形式,它具有先進靈活的運行控制模式,可以實現(xiàn)分布式可再生能源的高比例接入。隨著能源互聯(lián)網(wǎng)和主動配電網(wǎng)的發(fā)展,未來主動配電網(wǎng)中分布式發(fā)電和微電網(wǎng)必將規(guī)�；瘧�。含有大量可再生能源的微電網(wǎng)將高滲透率接入配電網(wǎng),這將改變配電網(wǎng)的潮流分布和網(wǎng)絡性質。分布式可再生能源間歇性隨機性的特點將導致微電網(wǎng)并網(wǎng)聯(lián)絡線功率的劇烈變化,將給可再生能源消納和電力系統(tǒng)調(diào)峰調(diào)頻帶來困難,同時給配電網(wǎng)以及上級電力網(wǎng)絡的安全運行和優(yōu)化調(diào)度帶來挑戰(zhàn)。本文基于未來主動配電網(wǎng)環(huán)境,以風光儲微電網(wǎng)為研究對象,主要研究了微電網(wǎng)并網(wǎng)聯(lián)絡線功率控制策略。主要工作如下:1、通過對比典型的光儲發(fā)電系統(tǒng)拓撲結構,設計了風光儲微電網(wǎng)的拓撲結構。該結構在減少一次側設備使用的基礎上,可以充分發(fā)揮儲能單元的功率調(diào)節(jié)作用和功率變換器的控制作用,提高系統(tǒng)運行和調(diào)度的靈活性,在滿足系統(tǒng)供電可靠性的條件下,增加了風光儲光儲微電網(wǎng)對內(nèi)部電源的可調(diào)度維度。2、在主動配電網(wǎng)環(huán)境下,針對風光儲微電網(wǎng)并網(wǎng)聯(lián)絡線功率波動與調(diào)度問題,以調(diào)度周期內(nèi)信息交互為基礎,給出了聯(lián)絡線功率平滑目標與計算方法,制定了聯(lián)絡線功率分時恒定控制策略,可以實現(xiàn)微電網(wǎng)對對外部配電網(wǎng)的即插即用,以及對微電網(wǎng)內(nèi)部分布式電源的即插即用。設計了兩層分層控制結構,上層中心控制器綜合考慮自身運行工況和主動配電網(wǎng)調(diào)度需求,實現(xiàn)系統(tǒng)運行模式的選擇切換與底層控制器的協(xié)調(diào)控制;底層控制器實現(xiàn)微電網(wǎng)內(nèi)供需功率的實時平衡,實現(xiàn)了微電網(wǎng)內(nèi)各分布式可再生能源的功率協(xié)調(diào)控制,保證了并網(wǎng)聯(lián)絡線功率的分時恒定。3、綜合考慮風光儲微電網(wǎng)系統(tǒng)運行中風速與光照強度的隨機變化,選取了典型的風速和光照變化條件,使系統(tǒng)可以在所有可能的運行狀態(tài)下正常工作并且完成任意運行狀態(tài)之間的平滑切換�；谏鲜鰲l件,在Matlab/Simulink環(huán)境下搭建了風光儲微電網(wǎng)功率控制策略的仿真算例,使用Stateflow工具箱制定了運行狀態(tài)轉換策略,實現(xiàn)了系統(tǒng)所有運行狀態(tài)的正常運行和無縫連續(xù)切換,仿真結果驗證了所提控制策略的正確性與有效性。
[Abstract]:Distributed generation is one of the important approaches to the development of renewable energy, and microgrid is an important form of integrated distributed renewable energy generation, which has advanced and flexible operation control mode. High proportion access to distributed renewable energy can be realized. With the development of energy Internet and active distribution network, distributed generation and microgrid in active distribution network will be applied on a large scale in the future. The microgrid with a large amount of renewable energy will be connected to the distribution network with high permeability, which will change the power flow distribution and network properties of the distribution network. The intermittent randomness of distributed renewable energy will lead to drastic changes in the connection line power of microgrid, which will make it difficult to absorb renewable energy and adjust peak and frequency of power system. At the same time, it brings challenges to the safe operation and optimal dispatching of distribution network and superior power network. In this paper, based on the future active distribution network environment, this paper mainly studies the power control strategy of the connection line of the microgrid based on the wind storage microgrid. The main work is as follows: 1. By comparing the typical topology of optical storage power generation system, the topology of the wind-storage micro-grid is designed. On the basis of reducing the use of primary side equipment, the structure can give full play to the power regulation function of energy storage unit and the control role of power converter, improve the flexibility of system operation and scheduling, and meet the condition of system power supply reliability. In the active distribution network environment, aiming at the power fluctuation and dispatching problem of the tie-line connected to the solar microgrid, it is based on the information exchange in the dispatching cycle. The smooth target and calculation method of tie-line power are given, and the tie-line power time-sharing constant control strategy is worked out, which can realize the plug and play of micro-grid to external distribution network, and to the internal distributed generation of micro-grid. A two-layer hierarchical control structure is designed. The upper central controller considers its own operation conditions and the dispatching requirements of the active distribution network synthetically, and realizes the selection and switching of the system operation mode and the coordination control of the bottom controller. The bottom controller realizes the real-time balance of power supply and demand in microgrid, and realizes the power coordination control of distributed renewable energy in microgrid. The timesharing of tie-line power is guaranteed. 3. Considering the random variation of wind speed and illumination intensity in the operation of wind-storage microgrid system, the typical wind speed and illumination variation conditions are selected. The system can work normally in all possible running states and finish smooth switching between any running states. Based on the above conditions, a simulation example of the power control strategy of the solar power storage and microgrid is built in Matlab/Simulink environment, and the operating state conversion strategy is formulated by using the Stateflow toolbox, which realizes the normal operation and seamless continuous switching of all the running states of the system. Simulation results verify the correctness and effectiveness of the proposed control strategy.
【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM732

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