低壓配電網(wǎng)三相不平衡治理的研究
發(fā)布時間：2018-08-21 13:57
【摘要】：隨著智能電網(wǎng)的高速發(fā)展,對低壓配電網(wǎng)絡的電能質量和降低損耗提出了更高的要求,而三相負載不平衡是影響它們的重要因素。如果不采用合理高效的手段治理配電網(wǎng)中的三相不平衡,可能就會影響整個電力系統(tǒng)安全穩(wěn)定的運行。因此,低壓配電網(wǎng)中三相不平衡問題成為人們研究的熱點。通常對于低壓網(wǎng)段三相負荷不平衡的治理,常用的是無功補償裝置和智能換相開關。雖然兩者均能達到治理的目的,但前者由于其較高的成本和較大的體積使其不利于在市場中廣泛的應用,而后者大都是基于機械觸點開關來進行換相,會對供電質量產(chǎn)生較大的影響。因此,本文設計了全電容補償?shù)臒o功補償方案和固態(tài)智能換相開關兩種三相不平衡治理方案,具體工作主要包括:1.介紹了無功補償和相間負荷調整的應用發(fā)展現(xiàn)狀,總結了兩種三相不平衡度的計算方法,分析了三相不平衡對配電變壓器、輸電線路、發(fā)電機等帶來的危害,概述了電力相關部門常采用的解決三相不平衡的措施。2.從無功補償角度,分析了無功補償原理和三相功率平衡化現(xiàn)象。通過分析典型單相負荷的不平衡補償,進而引出了基于理想補償網(wǎng)絡的三相負荷補償模型,并對該模型進行仿真分析。接著針對理想補償網(wǎng)絡中存在的不足,設計了矢量分析的補償策略,并推得了其數(shù)學模型。3.以矢量分析補償策略為基礎,設計了基于全電容的編組復合開關無功補償方案。針對該方案中與補償電容值相關的基波電流有功和無功分量檢測問題,設計了空間矢量變換的電流檢測方法。通過對方案進行仿真分析,驗證了其可行性。4.最后從負荷相序調整角度,設計了基于固態(tài)智能換相開關的三相不平衡治理方案。通過對固態(tài)智能換相開關進行仿真,驗證了其在換相過程中電壓中斷時間大大的縮短。接著詳細的介紹了該治理方案中各個主要功能模塊和最優(yōu)換相策略的獲得過程,同時建立了三相不平衡優(yōu)化模型,并采用加速粒子群智能優(yōu)化算法對模型求解。通過實驗仿真分析,驗證了所建立的模型和求解方法的可行性。
[Abstract]:With the rapid development of smart grid, the power quality and loss reduction of low-voltage distribution network are required higher, and three-phase load imbalance is an important factor affecting them. If we do not use reasonable and efficient means to control the three-phase imbalance in the distribution network, it may affect the safe and stable operation of the whole power system. Therefore, the problem of three-phase imbalance in low-voltage distribution network has become a hot topic. Reactive power compensator and intelligent commutation switch are commonly used for the treatment of unbalanced three-phase load in low voltage network. Although both can achieve the goal of governance, the former, because of its high cost and large volume, is not conducive to its wide application in the market, while the latter is mostly based on mechanical contact switches for commutation. Will have a greater impact on the quality of power supply. Therefore, the reactive power compensation scheme of full capacitance compensation and the two three phase imbalance control schemes of solid state intelligent commutation switch are designed in this paper. The main work includes: 1. This paper introduces the application and development of reactive power compensation and interphase load adjustment, summarizes two calculation methods of three-phase unbalance, analyzes the harm of three-phase unbalance to distribution transformer, transmission line, generator, etc. The measures to solve the three-phase imbalance commonly adopted by power-related departments. 2. 2. From the angle of reactive power compensation, the principle of reactive power compensation and the phenomenon of three-phase power balance are analyzed. By analyzing the unbalanced compensation of typical single-phase load, a three-phase load compensation model based on ideal compensation network is proposed, and the model is simulated and analyzed. Then, the compensation strategy of vector analysis is designed for the deficiency of ideal compensation network, and its mathematical model. 3. Based on the compensation strategy of vector analysis, the reactive power compensation scheme of marshalling compound switch based on full capacitance is designed. In order to detect the active and reactive components of the fundamental current which is related to the compensation capacitance, a space vector transform (SVT) current detection method is designed. The feasibility of the method is verified by simulation and analysis. Finally, from the point of view of load phase sequence adjustment, a three phase imbalance control scheme based on solid state intelligent commutation switch is designed. Through the simulation of the solid-state intelligent commutation switch, it is verified that the voltage interruption time is greatly shortened during the commutation process. Then the process of obtaining the main function modules and the optimal commutation strategy is introduced in detail. At the same time, the three-phase unbalanced optimization model is established, and the accelerated particle swarm optimization algorithm is used to solve the model. The feasibility of the established model and the solving method are verified by simulation.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM732
[Abstract]:With the rapid development of smart grid, the power quality and loss reduction of low-voltage distribution network are required higher, and three-phase load imbalance is an important factor affecting them. If we do not use reasonable and efficient means to control the three-phase imbalance in the distribution network, it may affect the safe and stable operation of the whole power system. Therefore, the problem of three-phase imbalance in low-voltage distribution network has become a hot topic. Reactive power compensator and intelligent commutation switch are commonly used for the treatment of unbalanced three-phase load in low voltage network. Although both can achieve the goal of governance, the former, because of its high cost and large volume, is not conducive to its wide application in the market, while the latter is mostly based on mechanical contact switches for commutation. Will have a greater impact on the quality of power supply. Therefore, the reactive power compensation scheme of full capacitance compensation and the two three phase imbalance control schemes of solid state intelligent commutation switch are designed in this paper. The main work includes: 1. This paper introduces the application and development of reactive power compensation and interphase load adjustment, summarizes two calculation methods of three-phase unbalance, analyzes the harm of three-phase unbalance to distribution transformer, transmission line, generator, etc. The measures to solve the three-phase imbalance commonly adopted by power-related departments. 2. 2. From the angle of reactive power compensation, the principle of reactive power compensation and the phenomenon of three-phase power balance are analyzed. By analyzing the unbalanced compensation of typical single-phase load, a three-phase load compensation model based on ideal compensation network is proposed, and the model is simulated and analyzed. Then, the compensation strategy of vector analysis is designed for the deficiency of ideal compensation network, and its mathematical model. 3. Based on the compensation strategy of vector analysis, the reactive power compensation scheme of marshalling compound switch based on full capacitance is designed. In order to detect the active and reactive components of the fundamental current which is related to the compensation capacitance, a space vector transform (SVT) current detection method is designed. The feasibility of the method is verified by simulation and analysis. Finally, from the point of view of load phase sequence adjustment, a three phase imbalance control scheme based on solid state intelligent commutation switch is designed. Through the simulation of the solid-state intelligent commutation switch, it is verified that the voltage interruption time is greatly shortened during the commutation process. Then the process of obtaining the main function modules and the optimal commutation strategy is introduced in detail. At the same time, the three-phase unbalanced optimization model is established, and the accelerated particle swarm optimization algorithm is used to solve the model. The feasibility of the established model and the solving method are verified by simulation.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM732
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