基于电网计算数据库与SCADA的潮流文件实时生成系统

该数据库是以二维自由表为基本存放数据的形式,将电力系统的设备参数按设备类型存入表中,并在PDSB的基础上实现与SCADA数据交换的功能。开发了实时生成潮流文件的系统,该系统基于PDSB的数据,结合SCADA实时得到母线负荷、发电、实际运行的网络结构等数据,快速准确地生成某种格式的潮流文件,作为系统稳定分析的源文件。     

操作票在线生成系统的设计与实现

介绍了一种操作票在线生成系统的设计与实现。该系统结合线程机制。利用网络通信方式访问SCADA(Supervisory Control and Data Acquisition)系统，将变电站(所)现场的设备状态信息和运行信息引入，并通过数据校核保证了数据的一致性。文章着重阐述了系统与SCADA的接口方案以及实时数据复制和校核的方法。     

基于实时信息的区域备自投装置自动投退控制系统研究

针对目前电网备自投装置投退策略没有充分考虑潮流变化、上下级电网联动的问题,提出了基于实时信息的备自投装置自动投退控制系统。该系统部署在AVC(自动电压控制)从机上,利用现有的测控和远动装置,通过调度SCADA(调度数据采集与监控)系统获取电网实时信息,综合分析电网故障前后潮流分布、设备容载情况,计算生成投退指令。测试结果表明,该系统可有效提升备自投装置运行管理水平,进而提高供电可靠性。     

基于SCADA系统的电网线损实时计算功能设计

为克服近似估算方法计算线损时与实际线损相差较大、缺乏实时性、使得线损分析和理论计算受到限制的缺点,利用SCADA系统的实时数据,在线分别生成基于潮流的电网线损值和基于状态估计的电网线损值实时数据,将实时数据用于理论线损计算,可有效提高线损计算的实时性、结果的可靠性和管理的方便性。     

咸阳供电局无功电压管理系统设计与开发

描述了如何利用SCADA、负控管理、电量计费等自动化系统中的实时数据,设计开发咸阳供电局无功电压管理系统.帮助管理人员及时掌握各级电网的无功潮流、主要电压监测点电压合格率、无功及调压设备的运行工况,及时采取有效措施,改善电能质量、降低电网损耗,提高运行管理水平.     

基于SCADA和WAMS的电网仿真运行方式

电网仿真初始运行方式是影响计算结果的主要因素之一。由于SCADA覆盖了电网主要运行设备,因此可以将SCADA数据作为建立电网仿真计算运行方式的主要数据源。然而,仅仅依赖SCADA数据建立的初始运行方式与实际系统相比可能存在较大偏差。随着广域实时动态监测系统(WAMS)逐步在电网中的广泛应用,由其采集的电网实时动态数据也成为建立仿真初始运行方式的主要数据源之一。作者提出了一种利用SCADA数据和WAMS数据建立电网仿真计算运行方式的方法。该方法计及了SCADA和WAMS的特点,确定了SCADA、WAMS与仿真计算数据库间的数据流,具有明确校核调整机制。利用该方法所建立的运行方式可以经受SCADA、WAMS实测数据的反复校核。     

地区电网变压器经济运行实时控制系统

设计了地区电网变压器经济运行的实时控制系统.该系统根据变压器经济运行理论,利用监控与数据采集(SCADA)系统采集的实时数据和短期负荷预测结果,并考虑实际运行中变压器投切次数的限制,在线决定变压器的经济运行方式,并通过SCADA系统对变压器进行投切操作.该系统与SCADA系统协同工作,充分利用了SCADA系统的高可靠性,并且不需要开发新的硬件,因此具有开发周期短、使用方便、运行可靠的优点.在实际工程应用中取得了良好效果.     

多端柔性直流输电能效计量系统设计与实现

为监测柔性直流输电系统各能耗设备及整体系统的损耗,开发了一套多端柔性直流输电能效计量系统,该系统通过采集调度主站电能量采集系统及数据采集与监视控制(SCADA)系统中的数据,并通过能耗计算模型实时计算,实现柔性直流输电系统在不同运行状态下的系统整体、换流站、能耗设备及电缆的实时能效监视、能效统计以及经济化运行分析等功能.该系统对能效计量系统的建设可起到借鉴作用.     

多智能体调度操作票自动生成与管理系统

针对现有电网调度操作票系统的现状,为满足值班调度员对于实时生成操作票的要求,提出了一种基于多智能体技术的电网调度操作票自动生成管理系统。具体介绍了该系统的整体功能结构、操作票自动生成流程和审核流程。该系统应用多智能体技术,与SCADA系统实时共享数据,与调度管理信息系统(DMIS)智能协作,在实际应用中取得了良好的效果。     

电网调控分布式SCADA系统体系架构与关键技术

由于采用主备机方式同时处理所有实时数据,现有数据采集与监控(SCADA)系统在数据吞吐能力、实时性、可扩展性、可靠性等方面面临着严峻挑战。文中提出一种新型分布式SCADA系统,对其体系架构和相关关键技术,如分布式资源和任务管理、分布式实时数据管理、分布式数据处理等进行了讨论。该系统突破了现有SCADA数据处理方式的瓶颈,可有效提升SCADA系统的性能,适应未来电网调控业务的发展。     

面向新型电力系统的风电调频技术分析

在我国未来的新型电力系统中,风电将承担调频任务,保障电力系统安全稳定地运行。为了系统概述风电调频的研究现状,总结了风电机组调频技术、风电场调频技术及相关的建模及策略研究。风电机组的调频方式主要包括转子动能控制、功率备用控制和联合控制。风电场参与调频需要机组间的相互配合以最大化调频效果,也可以通过外加辅助设备协助调频。风电调频策略依托于模型的建立,然而目前风电场的模型均采用等值化方法,与实际电力系统存在一定差距。未来的发展中,应进一步优化模型,完善调频策略,早日实现工业应用。     

地区电网实时电能质量数据管理系统

提出了一种基于局域网的地区电网电能质量实时数据管理系统，介绍了该系统的整体结构、各构成部分的功能与特点，以及数据传输和处理方式。该系统集电能质量在线监测和数据管理功能于一体，实现了电网电能质量指标的实时集中管理。     

Effects of various power system stabilizers on improving power system dynamic performance

To ensure the small-signal stability of a power system, power system stabilizers (PSSs) are extensively applied for damping low frequency power oscillations through modulating the excitation supplied to synchronous machines, and increasing interest has been focused on developing different PSS schemes to tackle the threat of damping oscillations to power system stability. This paper examines four different PSS models and investigates their performances on damping power system dynamics using both small-signal eigenvalue analysis and large-signal dynamic simulations. The four kinds of PSSs examined include the Conventional PSS (CPSS), Single Neuron based PSS (SNPSS), Adaptive PSS (APSS) and Multi-band PSS (MBPSS). A steep descent parameter optimization algorithm is employed to seek the optimal PSS design parameters. To evaluate the effects of these PSSs on improving power system dynamic behaviors, case studies are carried out on an 8-unit 24-bus power system through both small-signal eigenvalue analysis and large-signal time-domain simulations.     

厂用电监控系统在火电厂的应用

介绍了电厂厂用电监控系统的构成模式,利用智能终端设备和现场总线技术实现对设备的控制、监视、保护和通信。简述了智能终端设备的主要功能。分析了电气监控系统的发展前景,归纳了其控制特点,并总结了现场总线技术的优势。在此基础上,设计了未来发电厂监控系统的整体结构。     

Mine power system analysis

Procedures for the computer analysis of mine electrical power systems are summarized. Included are techniques relating to loadflow analysis, fault calculations, relay coordination, and motor starting. Actual programs may require conversational or file input data, and most are written in high-level languages such as FORTRAN, APL, or BASIC. The review covers algorithms developed over the past few years by a number of researchers     

Mine power system reliability

The research done over the last decade or so to apply the principles of reliability theory to mine electrical power systems is summarized. The multifaceted effort to estimate the failure rates of equipment applicable to the mine environment is examined, and the use of fault-tree analysis to predict the probability of hazardous voltages on the frames of various pieces of mining equipment is dealt with     

PTDF-based power system equivalents

The large size of power systems makes behavioral analysis of electricity markets computationally taxing. Reducing the system into a smaller equivalent, based on congestion zones, can substantially reduce the computational requirements. In this paper, we propose a scheme to determine the equivalent reactance of interfaces of a reduced system based upon the zonal power transfer distribution factors of the original system. The dc power flow model is used to formulate the problem. Test examples are provided using both an illustrative six-bus system and a more realistically sized 12 925-bus system.     

Three-dimensional power system stabilizer

Power system stabilizers (PSSs) are used to enhance damping of power system oscillations through excitation control of synchronous generator. The objective of the PSS is to generate a stabilizing signal, which produces a damping torque component on the generator shaft. Conventional PSSs are designed with the phase compensation technique in the frequency domain and include the lead-lag blocks whose parameters are determined according to a linearized power system model. The performance of conventional PSSs (CPSSs) depends upon the generator operating point and the system parameters, but a reasonable level of robustness can be achieved depending on the tuning method. This paper presents a new three-dimensional PSS (3D PSS), which uses rotor speed deviation, rotor acceleration and load angle deviation as input signals. The 3D PSS attempts to return the generator to the state-space origin, based on the generator’s trajectory in state-space and the achievement of torque equilibrium. The 3D PSS is robust to system parameters changes. The proposed algorithm was implemented in a digital control system, tested in a laboratory environment on a synchronous generator connected to the power system, and then compared with CPSS. Experimental results show that the proposed PSS achieves better performance than the CPSS in damping oscillations.     

Upgrading power system protection

Georgia-Pacific's Broadway Street Paper Mill in Green Bay,Wisconsin, is resolving an arc-flash hazard (AFH) problem by installing microprocessor (μP) bus-differential relays on medium-voltage switchgear and selectively replacing electromechanical (EM) overcurrent relays with μP relays. In addition to providing critical bus-differential protection, the μP relays will provide analog and digital communications for operator monitoring and control via the power-plant distributed control system (DCS) and will be ultimately used as the backbone to replace an aging hardwired load-shedding system.     

浅谈电力系统中电压无功功率的控制

电力系统的负荷需要消耗大量的无功功率,而无功功率平衡要满足众多的结点电压,就需要分级分层就地平衡。地区电网的电压无功控制,主要是控制其管辖范围内的各级变电站,使电网的电压合格,并实现无功的就地平衡,降低网损。为此,通过分析变电站电压无功控制的主要设备：有载调压变压器、并联电容器以及并联电抗器,说明变电站电压无功控制的原则、要求、实现方式。