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  本文選題：直流微網(wǎng)　切入點：柔性互聯(lián)開關　出處：《北京交通大學》2017年碩士論文

【摘要】：微網(wǎng)作為一種整合分布式電源、儲能系統(tǒng)和負荷的有效組織形式,自提出后逐漸受到國內外學者的廣泛關注和研究。但以往的研究主要集中于交流微網(wǎng),隨著具有直流特性的分布式電源和直流負荷的增加,直流微網(wǎng)的研究意義日益凸顯。以往對于直流微網(wǎng)的研究主要集中于微網(wǎng)內部,如直流微網(wǎng)內部的多源協(xié)調控制和儲能優(yōu)化配置等,但對于直流微網(wǎng)間能量調度控制策略等的研究還不是很多。本文以此為切入點,分析了利用柔性互聯(lián)開關進行直流微網(wǎng)互聯(lián)和能量調度的控制策略,重點從以下幾個方面對柔性互聯(lián)開關及其與直流微網(wǎng)構成的直流配電系統(tǒng)展開研究。(1)對柔性互聯(lián)開關在不同工作模式下的工作原理進行了詳細理論分析,采用雙載波三模式調制方式來實現(xiàn)柔性互聯(lián)開關在降壓、升降壓和升壓三種模式之間的平滑切換。分析了柔性互聯(lián)開關的單電流環(huán)和電壓電流雙閉環(huán)控制方式,并通過仿真和實驗進行驗證,證明了相關理論分析的正確性。(2)為實現(xiàn)柔性互聯(lián)開關進行直流微網(wǎng)互聯(lián)和能量調度的功能,設計了柔性互聯(lián)開關的一次調節(jié)下垂控制策略。柔性互聯(lián)開關將檢測到的兩端微網(wǎng)母線電壓大小輸入到控制器中,控制器根據(jù)設定好的下垂曲線計算出潮流調度的大小和方向。下垂曲線的設置與直流微網(wǎng)內部儲能變流器的控制相協(xié)調,通過微網(wǎng)間的能量調度使直流微網(wǎng)之間相互支撐,以維持兩側微網(wǎng)母線電壓均處于合理范圍。接著介紹了柔性互聯(lián)開關的并聯(lián)運行控制策略,說明了柔性互聯(lián)開關在并聯(lián)運行上的可行性。(3)為輔助實現(xiàn)對兩側直流微網(wǎng)儲能SOC(State of Charge)的優(yōu)化調節(jié),在柔性互聯(lián)開關一次調節(jié)的基礎上增加了二次調節(jié)功能。二次調節(jié)是指柔性互聯(lián)開關的一次調節(jié)下垂控制曲線會根據(jù)兩側微網(wǎng)儲能SOC的狀態(tài)上下平移。柔性互聯(lián)開關在得到兩側微網(wǎng)儲能SOC的大小后,由控制器根據(jù)相應的公式計算出平移量,將能量從SOC高的一側調度到低的一側,以維持兩側微網(wǎng)儲能SOC于合理范圍內,實現(xiàn)對儲能單元SOC的優(yōu)化調節(jié),延長其使用壽命。(4)對三種模式下的柔性互聯(lián)開關進行了小信號建模,以柔性互聯(lián)開關工作于Buck模式為例,推導了柔性互聯(lián)開關及兩側直流微網(wǎng)在柔性互聯(lián)開關工作于Buck模式時的數(shù)學模型,并對其在下垂控制策略下的穩(wěn)定性進行了分析,說明了各控制變量的取值變化對直流微網(wǎng)運行穩(wěn)定性的影響。(5)在以上理論分析的基礎上,在Matlab/Simulink中搭建仿真模型,并且搭建了基于dSPACE1103的半實物仿真平臺,對相關理論和控制策略的正確性進行仿真和實驗驗證。
[Abstract]:As a kind of effective organization form of integrating distributed power supply, energy storage system and load, microgrid has been paid more and more attention by scholars at home and abroad since it was put forward. With the increasing of DC power supply and DC load, the research of DC microgrid is becoming more and more important. For example, multi-source coordinated control and optimal configuration of energy storage in DC microgrid, but there are not many researches on the control strategy of energy scheduling between DC microgrids. The control strategy of DC microgrid interconnection and energy scheduling using flexible interconnected switches is analyzed. In this paper, the flexible interconnected switch and its DC distribution system composed of DC microgrid are studied from the following aspects. The working principle of the flexible interconnected switch in different working modes is analyzed in detail. The double carrier three mode modulation mode is used to realize the smooth switching between three modes of flexible interconnected switch, i.e., the step-down mode, the lifting mode and the boost mode. The single current loop and voltage and current double closed loop control mode of the flexible interconnect switch are analyzed. Through simulation and experiment, it is proved that the correctness of the related theoretical analysis is the function of DC micro-grid interconnection and energy scheduling for flexible interconnected switches. The droop control strategy of the flexible interconnect switch is designed. The voltage of the microgrid bus is input to the controller by the flexible interconnect switch. The controller calculates the size and direction of power flow scheduling according to the set droop curve. The setting of droop curve is coordinated with the control of the internal energy storage converter of DC microgrid, which supports each other through the energy scheduling between microgrids. In order to maintain the voltage of microgrid bus in a reasonable range, the parallel operation control strategy of flexible interconnected switch is introduced. The feasibility of flexible interconnected switch in parallel operation is explained. The secondary regulation function is added on the basis of the primary regulation of the flexible interconnected switch, which means that the droop control curve of the primary regulation of the flexible interconnected switch will be shifted up and down according to the state of the energy storage SOC on both sides of the microgrid. After the switch gets the size of the energy storage SOC on both sides of the microgrid, The translation amount is calculated by the controller according to the corresponding formula, and the energy is scheduled from the high side of SOC to the low side, in order to maintain the energy storage SOC of both sides of the microgrid within a reasonable range, the optimal regulation of the energy storage unit SOC can be realized. Prolonging its service life. (4) small signal modeling of flexible interconnected switches in three modes is carried out. Taking flexible interconnected switches working in Buck mode as an example, The mathematical models of flexible interconnected switch and DC microgrid in Buck mode are derived, and its stability under droop control strategy is analyzed. This paper explains the influence of the change of control variables on the operation stability of DC microgrid. On the basis of the above theoretical analysis, the simulation model is built in Matlab/Simulink, and the hardware-in-the-loop simulation platform based on dSPACE1103 is built. The correctness of relevant theory and control strategy is verified by simulation and experiment.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM727

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