共查询到20条相似文献,搜索用时 890 毫秒
1.
2.
城市配电网发展策略探讨 总被引:2,自引:0,他引:2
鉴于目前缺少针对区域电网框架内有效指导城市配电网发展工具的问题,提出基于鱼骨图分析法的城市配电网发展策略研究,给出适用于区域电网角度下分析城市配电网发展特点及薄弱环节的工具.首先采用鱼骨图分析法找出能够表征配电网发展水平的宏微观指标,并通过对比法分析各项指标可以找出城市配电网的薄弱环节;在此基础上选取某一区域电网内典型... 相似文献
3.
工厂配电系统中以感性负载—电动机为主,消耗无功功率较大,系统功率因数较低,对电网不利,需要无功功率补偿设备,介绍了以负荷统计方式来计算配电系统中无功功率补偿容量的粗略计算方法及无功补偿设备的选用。 相似文献
4.
工厂配电系统中以感性负载—电动机为主,消耗无功功率较大,系统功率因数较低,对电网不利,需要无功功率补偿设备,介绍了以负荷统计方式来计算配电系统中无功功率补偿容量的粗略计算方法及无功补偿设备的选用。 相似文献
5.
《International Journal of Electrical Power & Energy Systems》2012,43(1):158-166
A novel islanding detection method for an inverter-based distribution generation power system is proposed in this paper. The inverter-based distribution generation power system includes a dc power source and a grid-connected DC/AC inverter. The grid-connected DC/AC inverter acts as a virtual capacitor as the frequency is slightly lower than the fundamental frequency of utility voltage. Since only the inverter-based distribution generation power system supplies power to the load as the utility power interruption occurs, the virtual capacitor operation of the inverter-based distribution generation power system will result in the change of load voltage in amplitude or frequency. Hence, the proposed method can immediately detect the islanding operation. 相似文献
6.
基于概率潮流的风电分布式电源优化配置 总被引:1,自引:0,他引:1
由于风电机组输出功率的随机波动性,使得基于风电机组的分布式电源并网后,给配电系统的结构和运行带来巨大变化,影响系统的安全性和可靠性。在含分布式电源的配电网系统规划中,对分布式电源进行合理选择和配置是发挥最大效益的关键。采用Weibull分布来描述风速的随机变化,并计及风电机组强迫停机率的影响,结合功率曲线,建立风力发电的概率分析模型。通过Cornish-Fisher级数交流概率潮流计算方法,分析风电和负荷的随机波动对含分布式电源配电系统的影响,利用混合整数非线性规划方法,确定风电系统的最佳接入点和注入容量使得系统有功网损最小。 相似文献
7.
配电监控系统将智能配电设备数字化信息进行采集和处理,实现配电站少人或无人值守。介绍了常见低压配电系统元件的选择、监控系统现场通信协议及总线的应用,设计了配电监控系统的几种组网方案,指出了配电系统今后将融入越来越多的现代电子技术和网络通信技术以满足用户的实际需求,为用户创造价值。 相似文献
8.
9.
High-voltage power distribution systems are connected in a branch configuration so as to meet the need for highly reliable power service. When service is interrupted the faulty section is automatically isolated and the power supply is rerouted from an adjacent power distribution system thereby minimizing the service interruption area. The faulty section in the power distribution system is quickly located by means of time relays installed in the switchgears. The settings of those time relays, however, must be monitored constantly. For this reason, we have proposed a “section management method” which can supervise each section of the power distribution system. From this method, we developed a prototype automated distribution system for overall management of time relays through the use of internal software, facilities and customer feedback. This paper describes the section management of power distribution systems. 相似文献
10.
11.
利用配电网络传输配电自动化数据 ,一直是人们追求的目标 ,配电网载波通信与传统的载波通信有很大不同。在分析配电网载波通道及配电网通信机的特殊性之后 ,介绍了OFDM调制技术、令牌环技术在配电网通信中的应用 ,指出新的通信技术与网络技术结合是解决配电网数据传输的有效途径之一。 相似文献
12.
直流配电的电能质量研究直接影响到当前直流配电理论技术的发展。首先论述了直流配电系统的配电电压等级和网络结构,然后详细分析了当前直流配电系统中存在的电压波动、闪变和谐波等电能质量问题。接着重点阐述了迄今为止国内外相关的直流配电电能质量标准,以及适用于直流配电电能质量的评估体系和方法。之后总结归纳了当前国内外对直流配电系统中电能质量问题的治理方案。最后对目前直流配电电能质量的研究方向进行了探讨,为今后直流配电电能质量的研究提供参考。 相似文献
13.
文章从配电系统可靠性概念入手,重点分析了影响配电系统可靠性的各种因素,指出影响配电系统可靠性的因素主要有发生频度、停电规模、故障探查排除与修复、预安排停电等4个方面。结合广东南海供电局10kV配电系统的实际情况,详细阐述了配电系统可靠性在配电网规划、建设、改造、运行中的应用。 相似文献
14.
Meei-Song Kang Chao-Shun Chen Chia-Hung Lin Chia-Wen Huang Meng-Fu Kao 《Power Systems, IEEE Transactions on》2006,21(3):1062-1068
This paper presents a systematic methodology to analyze the power loss of whole distribution system in Taipower. The total power delivered to the distribution system has been calculated according to the total power generation and power loss of transmission system. To enhance the efficiency for power loss analysis of voluminous distribution feeders, the artificial neural network (ANN)-based simplified power loss models have been developed for the overhead feeders and underground feeders, respectively. The three-phase load flow analysis is executed to find the sensitivity of feeder loss with the variation of power loading, conductor length, and total capacity of distribution transformers. By this way, the data set for neural network training is prepared to derive the ANN-based simplified power loss model. The power loss of each distribution feeder can be derived easily according to the key factors of hourly loading, feeder length, and transformer capacity. By integrating the power loss of all feeders, the power loss of whole distribution system is therefore obtained to estimate the operation efficiency of Taipower system. 相似文献
15.
配电网系统作为电力系统的重要组成部分,承担着直接向用户供电的任务,是连接电网和用户的纽带,其安全运行非常重要。10 kV配电线路由于绝缘水平低的特点,易发生雷击过电压而造成绝缘事故。因此,10 kV配电线路的防雷保护是保证配电网安全运行、提高供电可靠性的重要措施。结合广东高要配电网的工程实际,以10 kV大企线为例,计算配电线路的耐雷水平和雷击跳闸率,并建立相应的ATP仿真模型,通过对安装线路避雷器前后的线路过电压水平的仿真计算,验证其能够有效提高配电线路的防雷性能,为工程设计提供有价值的基本数据。 相似文献
16.
提高配电系统供电可靠性是智能电网建设的重要目标,由于受多种因素的影响,供电企业为了提高配电网供电可靠性的投资行为具有较大的风险。在阐述了配电自动化系统的基本原理和结构特点的基础上,提出了配电自动化系统可靠性成本效益综合分析模型。结合配电系统可靠性的工程计算方法,通过对配电自动化系统在提高系统供电可靠性方面的成本和效益进行定量计算,结合正态云理论对配电自动化系统改造方案进行经济性评估,定义了多个综合评价指标,为电力管理工作者提供智能决策支持。通过对一个实际的配电系统进行计算分析,表明该模型具有较好的实用性和可行性。 相似文献
17.
《Electrical Engineering in Japan》2017,201(1):38-56
Constant power factor control of a power conditioning system in a large‐scale photovoltaic generation system (PV system) such as a mega‐solar system is introduced to mitigate voltage variations on a distribution line. However, it is difficult for the control to mitigate the voltage variation on a long distribution line because of the changes in the loss on the distribution line. This paper proposes an advanced reactive power control in which the power factor of the PV system is adjusted using both the output power of the PV system and the apparent power of loads not to minimize the voltage variation at the interconnecting point but to minimize the voltage variation over the whole distribution line. We report on the results based on numerical analysis on mitigating the voltage variation by applying this control. This paper shows that the proposed control can mitigate the voltage variation better than constant power factor control can. The proposed control has the potential to be used as a measure for suppressing voltage variations on a long distribution line. 相似文献
18.
19.
主动配电网宽适应性潮流灵敏度分析模型 总被引:2,自引:2,他引:0
分布式发电、储能及柔性负荷在配电网的大量接入引起配电网潮流的频繁变化,构建准确、简洁的节点注入功率与运行参数的函数模型对主动配电网的规划和运行至关重要。结合配电网辐射状拓扑结构,提出了一种对节点注入功率变化具有宽适应性的潮流灵敏度分析模型。所提灵敏度分析模型具体包含节点注入功率对线路损耗的二次形式的灵敏度模型、节点注入功率对节点电压的线性形式的灵敏度模型和节点注入功率对线路潮流的二次形式的灵敏度模型。对灵敏度模型应用于存在弱环网的配电系统时的有效性进行了分析,利用IEEE 33节点配电系统和含环网的IEEE 123节点配电系统进行仿真分析,仿真结果证明了所提灵敏度模型的有效性。 相似文献