本文選題：微電網(wǎng) + 并網(wǎng)/孤島運(yùn)行　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：隨著近些年新能源的廣泛應(yīng)用,小型光伏發(fā)電和風(fēng)能發(fā)電發(fā)展,人們將目光紛紛投向了更加環(huán)保、高效的微電網(wǎng)。它是由分布式發(fā)電系統(tǒng)(DG)、儲(chǔ)能系統(tǒng)、負(fù)荷及保護(hù)裝置組成的,微電網(wǎng)可以分為并網(wǎng)和孤島兩種運(yùn)行模式。微電網(wǎng)安全穩(wěn)定的運(yùn)行受模式間的平滑切換的影響很大,所以微電網(wǎng)的平滑切換控制很重要,本文以風(fēng)光儲(chǔ)微電網(wǎng)系統(tǒng)為研究對(duì)象,建立數(shù)學(xué)模型,并采用相應(yīng)的控制策略,主要研究微電網(wǎng)并網(wǎng)和孤島兩種運(yùn)行模式的切換過程。首先,簡(jiǎn)要說明了光伏發(fā)電系統(tǒng)、蓄電池和風(fēng)力發(fā)電系統(tǒng)的結(jié)構(gòu)及其工作原理,分別搭建光伏電池發(fā)電系統(tǒng)、蓄電池系統(tǒng)和風(fēng)力發(fā)電系統(tǒng)的數(shù)學(xué)模型,并組成綜合微電網(wǎng)系統(tǒng)模型,實(shí)現(xiàn)光伏電源的最大功率跟蹤和蓄電池的恒電壓放電控制。其次,概述微電網(wǎng)的兩種運(yùn)行模式及其工作原理,針對(duì)微電源的不同特性提出相應(yīng)的控制策略。在分析微電網(wǎng)的運(yùn)行控制策略的基礎(chǔ)上,對(duì)逆變器PWM控制電路和數(shù)學(xué)模型進(jìn)行研究;提出改進(jìn)的鎖相環(huán)技術(shù),主要由電網(wǎng)相位檢測(cè)、相位預(yù)同步、相位生成等模塊組成,并將其適用于主從控制的微電網(wǎng)模型中;簡(jiǎn)要說明孤島檢測(cè)技術(shù),并給出逆變型分布式電源的孤島檢測(cè)電路模型。最后,針對(duì)微電網(wǎng)在模式切換過程中出現(xiàn)的電壓和頻率暫態(tài)波動(dòng)問題,提出改進(jìn)的狀態(tài)跟隨控制策略,在微電網(wǎng)并網(wǎng)運(yùn)行時(shí),主控逆變器采用恒功率控制,并以一個(gè)負(fù)反饋信號(hào)作為恒壓恒頻控制的輸入信號(hào),使恒壓恒頻控制器的輸出能夠跟隨恒功率控制器的輸出,保證微電網(wǎng)運(yùn)行方式的平滑切換。使用PSCAD/EMTDC軟件對(duì)主從控制的風(fēng)光儲(chǔ)微電網(wǎng)系統(tǒng)模型進(jìn)行計(jì)算仿真,仿真結(jié)果驗(yàn)證所提控制策略的有效性。
[Abstract]:With the wide application of new energy in recent years, the development of small-scale photovoltaic and wind power generation, people have turned their attention to more environmentally friendly and efficient microgrid. It is composed of distributed generation system (DG), energy storage system, load and protection device. The microgrid can be divided into two operation modes: grid-connected and islanding. The safe and stable operation of microgrid is greatly affected by the smooth switching between modes, so the smooth switching control of microgrid is very important. In this paper, a mathematical model is established and the corresponding control strategy is adopted. The switching process of two operation modes, grid-connected and islanding, is studied in this paper. Firstly, the structure and working principle of photovoltaic system, storage battery and wind power system are briefly described, and the mathematical models of photovoltaic system, battery system and wind power system are built, respectively. The integrated microgrid system model is constructed to realize the maximum power tracking of photovoltaic power supply and the constant voltage discharge control of battery. Secondly, two operation modes and their working principles of microgrid are summarized, and corresponding control strategies are put forward according to the different characteristics of micro-power supply. On the basis of analyzing the operation control strategy of microgrid, the PWM control circuit and mathematical model of inverter are studied, and an improved phase-locked loop technology is proposed, which is mainly composed of power grid phase detection, phase pre-synchronization, phase generation and so on. It is applied to the microgrid model of master-slave control, the islanding detection technology is briefly described, and the islanding detection circuit model of inverter distributed power generation is given. Finally, aiming at the transient fluctuation of voltage and frequency during mode switching, an improved state following control strategy is proposed. When the microgrid is connected to the grid, the main inverter adopts constant power control. A negative feedback signal is used as the input signal of constant voltage and constant frequency control so that the output of constant voltage constant frequency controller can follow the output of constant power controller and ensure smooth switching of operation mode of microgrid. The PSCAD/EMTDC software is used to simulate the system model of the master and slave control system of the solar microgrid. The simulation results verify the effectiveness of the proposed control strategy.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM727

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