直流微電網(wǎng)監(jiān)測(cè)與保護(hù)系統(tǒng)研究
發(fā)布時(shí)間：2019-06-10 06:16
【摘要】：隨著全球經(jīng)濟(jì)的發(fā)展,能源需求快速增長,尤其是對(duì)電力的需求更加凸顯,環(huán)境問題也日益嚴(yán)重。在能源需求和環(huán)境保護(hù)的雙重壓力下,分布式發(fā)電應(yīng)運(yùn)而生。為了最大限度了發(fā)掘分布式發(fā)電的價(jià)值,微電網(wǎng)的概念逐漸成為了當(dāng)下的一大熱點(diǎn)。直流微電網(wǎng)具有變換環(huán)節(jié)少、控制簡單和便于分布式電源接入的優(yōu)勢(shì)。隨著電力電子技術(shù)的不斷發(fā)展,直流微電網(wǎng)的發(fā)展迎來了曙光。本文基于直流環(huán)狀微電網(wǎng),對(duì)其監(jiān)測(cè)和保護(hù)系統(tǒng)進(jìn)行研究,為推廣直流微電網(wǎng)的工程應(yīng)用提供技術(shù)支持。 文章以電壓等級(jí)為400V,容量為80kW的直流環(huán)網(wǎng)系統(tǒng)為例,分析了系統(tǒng)的組網(wǎng)方式、組成部分和運(yùn)行特點(diǎn)。系統(tǒng)采用雙向DC/DC變流器的組網(wǎng)方式,這使得系統(tǒng)在潮流控制、系統(tǒng)保護(hù)和供電可靠性方面都具有明顯優(yōu)勢(shì)。文章詳細(xì)介紹了各組成部分的型號(hào)選型,同時(shí)對(duì)系統(tǒng)的控制策略、運(yùn)行方式、備用方式和故障診斷等進(jìn)行了闡述�；谠撝绷魑㈦娋W(wǎng)的結(jié)構(gòu)和運(yùn)行特點(diǎn),展開對(duì)于監(jiān)測(cè)方法和保護(hù)策略的研究。 根據(jù)保護(hù)的需要,對(duì)直流微電網(wǎng)的電壓、電流幅值及方向、功率、溫度和電池SOC(State of Charge)等參數(shù)進(jìn)行實(shí)時(shí)監(jiān)測(cè)。文章對(duì)監(jiān)測(cè)系統(tǒng)的結(jié)構(gòu)和設(shè)備選型進(jìn)行了介紹,同時(shí)設(shè)計(jì)了相應(yīng)的硬件電路。采用以RS-485為底層通信和以工業(yè)以太網(wǎng)為上層通信的雙層通信方式,有效地提高了通信系統(tǒng)的抗干擾能力,同時(shí)也解決了通信距離長帶來的通信難題。電池SOC是電池管理和保護(hù)的重要參數(shù)。文章提出了一種改進(jìn)的按時(shí)積分法對(duì)儲(chǔ)能設(shè)備SOC進(jìn)行監(jiān)測(cè),大大地提高了SOC的估算精度。 結(jié)合該直流微電網(wǎng)的運(yùn)行方式,基于直流系統(tǒng)電流方向的特征,采用了以電流方向保護(hù)策略為主,電流速斷保護(hù)和定時(shí)限電流以及定時(shí)限電壓保護(hù)為輔的繼電保護(hù)方案,同時(shí)還考慮了熱過負(fù)荷保護(hù)和電池過充過放電保護(hù)。文章還對(duì)各保護(hù)策略的保護(hù)算法進(jìn)行了詳細(xì)介紹。該保護(hù)方案保護(hù)范圍大,能有效地保護(hù)系統(tǒng)的全線路,并能進(jìn)行快速的故障診斷和選擇性保護(hù)。
[Abstract]:With the development of the global economy, the energy demand is growing rapidly, especially the demand for electricity is more prominent, and the environmental problems are becoming more and more serious. Under the dual pressure of energy demand and environmental protection, distributed power generation emerges as the times require. In order to maximize the value of distributed power generation, the concept of microgrid has gradually become a hot spot. DC microgrid has the advantages of less conversion links, simple control and easy access to distributed power supply. With the continuous development of power electronics technology, the development of DC microgrid ushered in the dawn. In this paper, based on DC annular microgrid, its monitoring and protection system is studied, which provides technical support for popularizing the engineering application of DC microgrid. Taking the DC loop network system with voltage level of 400V and capacity of 80kW as an example, this paper analyzes the networking mode, components and operation characteristics of the system. The system adopts the networking mode of bidirectional DC/DC converter, which makes the system have obvious advantages in power flow control, system protection and power supply reliability. This paper introduces the model selection of each component in detail, and expounds the control strategy, operation mode, standby mode and fault diagnosis of the system. Based on the structure and operation characteristics of the DC microgrid, the monitoring method and protection strategy are studied. According to the need of protection, the voltage, current amplitude and direction, power, temperature and battery SOC (State of Charge) of DC microgrid are monitored in real time. In this paper, the structure and equipment selection of the monitoring system are introduced, and the corresponding hardware circuits are designed. The double layer communication mode with RS-485 as the bottom layer and industrial Ethernet as the upper layer is adopted, which effectively improves the anti-interference ability of the communication system and solves the communication problem caused by the long communication distance. Battery SOC is an important parameter of battery management and protection. In this paper, an improved time integration method is proposed to monitor the SOC of energy storage equipment, which greatly improves the estimation accuracy of SOC. Combined with the operation mode of the DC microgrid, based on the characteristics of the current direction of the DC system, a relay protection scheme is adopted, which is mainly based on the current direction protection strategy, supplemented by the current fast break protection, the fixed time limit current and the fixed time limit voltage protection. At the same time, thermal overload protection and battery overcharge and discharge protection are also considered. The protection algorithms of each protection strategy are also introduced in detail. The protection scheme has a wide protection range, can effectively protect the whole line of the system, and can carry out fast fault diagnosis and selective protection.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM77
[Abstract]:With the development of the global economy, the energy demand is growing rapidly, especially the demand for electricity is more prominent, and the environmental problems are becoming more and more serious. Under the dual pressure of energy demand and environmental protection, distributed power generation emerges as the times require. In order to maximize the value of distributed power generation, the concept of microgrid has gradually become a hot spot. DC microgrid has the advantages of less conversion links, simple control and easy access to distributed power supply. With the continuous development of power electronics technology, the development of DC microgrid ushered in the dawn. In this paper, based on DC annular microgrid, its monitoring and protection system is studied, which provides technical support for popularizing the engineering application of DC microgrid. Taking the DC loop network system with voltage level of 400V and capacity of 80kW as an example, this paper analyzes the networking mode, components and operation characteristics of the system. The system adopts the networking mode of bidirectional DC/DC converter, which makes the system have obvious advantages in power flow control, system protection and power supply reliability. This paper introduces the model selection of each component in detail, and expounds the control strategy, operation mode, standby mode and fault diagnosis of the system. Based on the structure and operation characteristics of the DC microgrid, the monitoring method and protection strategy are studied. According to the need of protection, the voltage, current amplitude and direction, power, temperature and battery SOC (State of Charge) of DC microgrid are monitored in real time. In this paper, the structure and equipment selection of the monitoring system are introduced, and the corresponding hardware circuits are designed. The double layer communication mode with RS-485 as the bottom layer and industrial Ethernet as the upper layer is adopted, which effectively improves the anti-interference ability of the communication system and solves the communication problem caused by the long communication distance. Battery SOC is an important parameter of battery management and protection. In this paper, an improved time integration method is proposed to monitor the SOC of energy storage equipment, which greatly improves the estimation accuracy of SOC. Combined with the operation mode of the DC microgrid, based on the characteristics of the current direction of the DC system, a relay protection scheme is adopted, which is mainly based on the current direction protection strategy, supplemented by the current fast break protection, the fixed time limit current and the fixed time limit voltage protection. At the same time, thermal overload protection and battery overcharge and discharge protection are also considered. The protection algorithms of each protection strategy are also introduced in detail. The protection scheme has a wide protection range, can effectively protect the whole line of the system, and can carry out fast fault diagnosis and selective protection.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM77
【參考文獻(xiàn)】
中國期刊全文數(shù)據(jù)庫 前10條
1 吳紅杰;齊鉑金;鄭敏信;劉永U，
本文編號(hào)：2496240
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