适应分布式电源接入的配电网保护研究
发布时间：2019-02-27 19:59
【摘要】：新能源分布式发电是新能源发电的一种重要的应用模式,有效地协调了经济发展和环境保护的矛盾,并且有助于提高供电可靠性。大量新能源分布式电源接入配电网,会影响到传统配电网的阶段式电流保护的正确动作,本文针对分布式电源接入后的配电网保护进行了研究,主要就分布式电源接入后的配电网短路电流计算和保护配置方案两方面展开了讨论。 新能源发电中常见的逆变型电源的故障模型和故障分析方法不同于传统电源。本文首先针对逆变型电源的故障分析模型进行研究,在现有定功率双闭环电流型控制策略的基础上,从理论上分析了逆变型电源的故障电流特征,并在此基础上提出了一种基于不同控制条件的受控电流源的故障计算简化模型和短路电流计算公式,为之后的保护整定计算提供了依据。 分布式电源的接入改变了传统配电网短路电流的分布,影响了相应线路保护动作的可靠性,本文针对不同方式接入的分布式电源带来的特殊问题进行了研究,在此基础上针对不同接入方式的情况提出了相应的配电网保护改进方案：(1)针对分布式电源从馈线接入的情况提出限制接入容量来保证故障可靠切除,提出了分布式电源准入容量的计算方法和此种接入方式下分布式电源自身保护和线路保护的配合方案；(2)针对单一逆变型电源从母线接入的情况,从速动性和可靠性方面考虑提出了一种配电网电流保护改进方案,上游线路新增反向低电压保护装置,下游线路提出改进整定计算方法,并用仿真验证了保护方案的可靠性；(3)针对多个分布式电源接入造成配电网运行方式和拓扑变化灵活的情况,提出一种距离速断保护和反时限距离保护相结合的距离保护方案,保证在整条线路发生故障时保证故障的有效隔离和分布式电源的持续运行。对距离保护出现的长短线配合的难题,提出了一种改进的纵联保护判据。上述两种基于本地信息的保护方案原理简单,需要的信息较少,简单可靠,实用性强,满足现阶段分布式电源接入对配电网保护的要求。
[Abstract]:New energy distributed power generation is an important application mode of new energy generation, which effectively coordinates the contradiction between economic development and environmental protection, and helps to improve the reliability of power supply. A large number of new energy distributed power supply access to the distribution network, will affect the traditional distribution network stage current protection correct action, this paper studies the distribution network protection after the distributed power supply access, This paper mainly discusses the calculation of short-circuit current and the scheme of protection configuration in distribution network after distributed power supply is connected. The fault model and fault analysis method of inverter power supply in new energy generation are different from those of traditional power source. Firstly, the fault analysis model of inverter power supply is studied in this paper. On the basis of the existing constant power double closed loop current mode control strategy, the fault current characteristics of inverter power supply are analyzed theoretically. On this basis, a simplified fault calculation model and short circuit current calculation formula for controlled current sources based on different control conditions are proposed, which provides the basis for the calculation of protection setting. The access of distributed power supply changes the distribution of short-circuit current in traditional distribution network and affects the reliability of the corresponding line protection operation. In this paper, the special problems brought about by different access modes of distributed power supply are studied in this paper. On the basis of this, the corresponding protection improvement scheme of distribution network is put forward according to different access modes: (1) aiming at the case of distributed power supply accessing from feeder, this paper proposes to limit the access capacity to ensure reliable fault removal. The calculation method of admission capacity of distributed power supply and the cooperation scheme of self-protection and line protection of distributed power supply under this access mode are put forward. (2) considering the connection from bus to bus of single inverter power supply, an improved scheme of distribution network current protection is put forward considering the speed and reliability, and the reverse low voltage protection device is added to the upstream line. An improved setting calculation method is proposed for downstream lines, and the reliability of the protection scheme is verified by simulation. (3) aiming at the flexible operation mode and topology change of distribution network caused by multiple distributed power supply access, a distance protection scheme combining distance quick-break protection and inverse time-limit distance protection is proposed. Ensure effective fault isolation and continuous operation of distributed power supply in the event of failure of the whole line. In this paper, an improved criterion of longitudinal protection is proposed to solve the difficult problem of long-and short-line coordination in distance protection. The above two protection schemes based on local information are simple in principle, need less information, are simple and reliable, and have strong practicability, which can meet the requirements of distributed power supply access to distribution network protection at present.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM77
本文编号：2431533
[Abstract]:New energy distributed power generation is an important application mode of new energy generation, which effectively coordinates the contradiction between economic development and environmental protection, and helps to improve the reliability of power supply. A large number of new energy distributed power supply access to the distribution network, will affect the traditional distribution network stage current protection correct action, this paper studies the distribution network protection after the distributed power supply access, This paper mainly discusses the calculation of short-circuit current and the scheme of protection configuration in distribution network after distributed power supply is connected. The fault model and fault analysis method of inverter power supply in new energy generation are different from those of traditional power source. Firstly, the fault analysis model of inverter power supply is studied in this paper. On the basis of the existing constant power double closed loop current mode control strategy, the fault current characteristics of inverter power supply are analyzed theoretically. On this basis, a simplified fault calculation model and short circuit current calculation formula for controlled current sources based on different control conditions are proposed, which provides the basis for the calculation of protection setting. The access of distributed power supply changes the distribution of short-circuit current in traditional distribution network and affects the reliability of the corresponding line protection operation. In this paper, the special problems brought about by different access modes of distributed power supply are studied in this paper. On the basis of this, the corresponding protection improvement scheme of distribution network is put forward according to different access modes: (1) aiming at the case of distributed power supply accessing from feeder, this paper proposes to limit the access capacity to ensure reliable fault removal. The calculation method of admission capacity of distributed power supply and the cooperation scheme of self-protection and line protection of distributed power supply under this access mode are put forward. (2) considering the connection from bus to bus of single inverter power supply, an improved scheme of distribution network current protection is put forward considering the speed and reliability, and the reverse low voltage protection device is added to the upstream line. An improved setting calculation method is proposed for downstream lines, and the reliability of the protection scheme is verified by simulation. (3) aiming at the flexible operation mode and topology change of distribution network caused by multiple distributed power supply access, a distance protection scheme combining distance quick-break protection and inverse time-limit distance protection is proposed. Ensure effective fault isolation and continuous operation of distributed power supply in the event of failure of the whole line. In this paper, an improved criterion of longitudinal protection is proposed to solve the difficult problem of long-and short-line coordination in distance protection. The above two protection schemes based on local information are simple in principle, need less information, are simple and reliable, and have strong practicability, which can meet the requirements of distributed power supply access to distribution network protection at present.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM77
【参考文献】
相关期刊论文 前2条
1 王江海;邰能灵;宋凯;顾临峰;盛继卿;;考虑继电保护动作的分布式电源在配电网中的准入容量研究[J];中国电机工程学报;2010年22期
2 毕天姝;刘素梅;薛安成;杨奇逊;;逆变型新能源电源故障暂态特性分析[J];中国电机工程学报;2013年13期
，本文编号：2431533
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2431533.html
教材专著
