基于PSASP的电子电力变压器建模与仿真

鉴于电子电力变压器对提高电力系统稳定性、改善供电灵活性具有潜在优势,在电力系统分析综合程序(PSASP)环境下建立了电子电力变压器稳态模型和暂态稳定模型,研究了基于电子电力变压器的电力系统潮流计算方法,提出了一种含电子电力变压器的电力系统牛顿交替潮流求解算法,利用PSASP的自定义程序功能(UPI)和用户自定义模型功能(UD)实现了电子电力变压器潮流及暂态稳定计算,并对含电子电力变压器的9节点WSCC系统算例进行了潮流及暂态稳定仿真计算。结果表明,建立的模型有效,提出的潮流求解算法收敛性好,电子电力变压器的引入使系统潮流可灵活控制,且提高了暂态稳定性。     

电力系统机电/电磁暂态仿真数据转换系统

针对目前电力系统机电暂态仿真与电磁暂态仿真各自相对独立的现状,从电力系统机电暂态/电磁暂态转换仿真的需求出发,提出并编程实现了一种基于PSS/E和EMTP软件的电力系统机电/电磁暂态仿真转换系统,该系统可以直接将机电暂态仿真数据转换为电磁暂态仿真数据,为机电暂态与电磁暂态两种原本相对独立的仿真搭起了桥梁。并以实际上海电网为例,结果表明该系统能准确地实现电力系统机电暂态仿真到电磁暂态仿真数据的成功转换。     

电力系统预想事故筛选的一种快速数值积分算法

提出了一种基于Duhamel积分的电力系统暂态稳定数值积分算法,这种算法将描述电力系统暂态过程的非线性微分方程组,表示为线性部分和非线性部分。通过合理地选取线性部分的系统矩阵,并用一个线性可积函数去逼近非线性部分,得到了一种二阶显式单步的暂态稳定数值积分算法。该算法的局部截断误差与改进欧拉法和隐式梯形积分相当,而计算量只有改进欧拉法的二分之一、不到隐式梯形积分的三分之一。新英格兰10机39节点系统和IEEE 145节点系统测试结果表明,该算法可应用于大规模电力系统的预想事故筛选。     

基于全纯函数嵌入的暂态稳定网络方程算法

数值积分法中是电力系统暂态稳定分析中重要的研究工作,但受限于交替求解微分-代数方程求解的困难,尝试从网络方程入手解决.引入全纯函数嵌入(holomorphic embedding)理论,重构节点模型,以计算解析解为目标,介绍求解非线性系统的原理与数值逼近理论的应用,之后针对电力系统暂态稳定分析,确保兼容电网中恒功率负荷...     

基于相量算法的STATCOM在风机 无功补偿中的应用

研究了简化的电磁暂态电力电子器件应用于机电暂态仿真的可行性。使用MATLAB-SIMULINK的相量算法,将电网中电流电压视为相量,采用滤去直流与谐波分量的隐式梯形法求解相量方程。在相量算法下搭建静止同步补偿装置(STATCOM)模型,对其电流和电压相量进行dq分解,采用PI和前馈解耦控制,通过对风电机组正常情况下的无功补偿以及短路故障下低电压穿越能力的无功支持来验证这种方法的可行性。仿真结果表明,在相量算法下,STATCOM具有快速无功调节的能力,从而验证了简化电磁暂态的STATCOM应用于机电暂态仿真的可行性,也体现出相量算法在大规模电力系统仿真中的精确性和快速性。     

PSASP2ATP暂态模型参数转换研究及软件研发

为了充分利用电力系统分析综合程序PSASP在现实电网中数据、分析和运行的积累与充分发挥电磁暂态计算程序ATP暂态分析和底层开发之优势,研究了PSASP软件中暂态模型和参数转换到ATP软件的基本方法.通过比较2款软件中电气元件暂态模型的异同,采用分模块转换方法,建立在软件内部对应元件模型、参数、数据的对应关系和转换途径....     

基于Bi-S-SRU的电力系统暂态稳定预防控制

暂态稳定预防控制是电力系统预防严重故障的有效措施之一。首先,利用双向堆叠简单循环单元（BiS-SRU）对电力系统运行时间序列整体感知能力强的特点,建立输入特征与暂态稳定指标之间蕴藏的映射关系,将建立的映射关系替代暂态稳定约束最优潮流（TSCOPF）模型中的非线性微分代数方程以简化计算;然后,结合自适应粒子群（APSO）优化算法,在保证系统稳定性的前提下,考虑发电调度成本最小化,形成预防控制策略;最后,在IEEE 39节点系统上进行测试,验证了所提方法的可行性。     

图像化数据驱动的电力系统暂态稳定性在线评估方法

目前电力系统暂态稳定性评估（TSA）大多采用标准算例生成的数据集,然而实际电网的母线、发电机、线路等电力元件的数量巨大,难以实现评估模型的实时监视和在线更新;而现有降维方法常常遗漏重要信息,导致预测精度下降。提出一种图像化数据驱动的电力系统暂态稳定性在线评估方法,将输入时间序列重新排列成二维图像,利用二维主成分分析法（2D-PCA）对原始图像进行特征降维,并建立卷积神经网络（CNN）模型进行系统稳定性预测。在IEEE-39算例中进行验证,结果表明本文所提基于2D-PCA和CNN的TSA模型在保证预测精度的同时能够大幅提高训练效率,有望推进深度学习在电力系统暂态稳定性在线评估的应用。     

EMTPE/EMTS电力系统电磁暂态与电力电子仿真软件

<正>主要功能:模拟多相电力系统的电磁、机电和控制系统的暂态特性,主要用于电力系统电磁暂态分析、超/特高压输电系统过电压和绝缘配合、各种电力电子装置包括高压直流输电(HVDC)和灵活交流输电(FACTS)装置的系统应用研究、设计和运行分析。荣获2003年国家科技进步二等奖技术特点:全中文图形化界面:建模、仿真、结果输出均使用图形化统一平台;单线图与多线图相结合,易呈现全局系统与局部电路结构。丰富的仿真模型:提供网络支路元件、开关及电力电子器件、电源、控制系统元件模块。强大的扩展功能:内置统计计算功能,适于研究随机操作过程;具备谐波分析、频谱分析等信号处理功能。     

多馈入直流大规模电网机电—电磁混合仿真的程序实现与结果分析

针对多馈入直流大规模电网,提出了实现一种新的机电—电磁混合仿真方法。在网络划分中,将多条直流进行解耦处理,形成单个交流机电网络与多个直流电磁子网的混合仿真计算;在直流电磁仿真中,对换流器进行不同工况划分和等值处理,并与直流线路构成统一的拓扑结构和简单网络,避免了含开关复杂网络的求解;在接口处理中,采用傅里叶变换提取电磁侧接口基波电流,参与机电侧网络的迭代计算,以保证数值稳定;另外,采用适时控制步长的方法,解决交直流大电网仿真可能出现的不收敛问题;最后,将混合仿真的结果与机电暂态仿真程序PSASP进行比较,分析多馈入直流同时换向失败的现象。     

基于EMTP的同塔并架多回线路防雷计算

通过对110 kV和220 kV单条输电线和同杆并架双回输电线路的防雷性能的仿真和计算,分析研究在多种雷击方式下输电线路的耐雷水平。采用国际通用的电力系统电磁暂态分析的仿真软件Elector-Magnetic Transient Program（EMTP）,对雷电侵入波在输电线路上所产生的过电压进行分析计算,得出过电压分布和变化的规律,进而从技术上和经济上限制雷电侵入波过电压。     

Contents

To strengthen power system defenses against the threats posed by electromagnetic transients as well as boost power quality, more and more power providers (including transmission companies, distribution companies and full-service energy companies) are undertaking transient and harmonic analyses in-house. This paper describes how the EMTP and HARMFLO Plus software packages arm users with sophisticated analytical capabilities in order to identify design and operational solutions.     

Evaluating the transient performance of standby diesel-generatorunits by simulation

The transient behavior of the standby diesel-generator units and the engineered safeguard loads at an operating nuclear power generating station was simulated using the electromagnetic transients program (EMTP). The authors discuss the standby diesel-generator units and the engineered safeguard load model development and the validation and verification of the applicable EMTP modules. The simulation results demonstrating the standby diesel-generator unit capability and illustrating the predicted transient deviations in the generator terminal voltage and frequency are included together with the voltage deviations within the engineered safeguard features distribution system     

Modeling and simulation of a grid-connected PV generation system for electromagnetic transient analysis

This paper addresses modeling and simulation of a grid-connected photovoltaic system (GCPS) to analyze its grid interface behavior and control performance in the system design. A simple circuit model of the solar array is used to easily simulate its inherent characteristics with the basic specification data. Detailed power and protection control of the GCPS as well as its electrical circuits have been represented by user-defined and built-in components to take into account transients in normal and fault conditions, which are dominated by its power electronic controller. The model has been described with the reference to and implemented in PSCAD/EMTDC, a power system transient software package. Extensive simulation results are presented and analyzed to validate that the proposed simulation model is effective for control and protection performance evaluation of the GCPS in terms of electromagnetic transient analysis.     

Power unit SOFC-MTG model in Electromagnetic Transient Software PSCAD

In the world energy scene in recent years, there has been a tendency towards electric power generation through an integration of alternatives sources. In this context, fuel cells are considered a new type of generating unit that has the ability to generate electrical power through direct conversion of fuels. In the case of stationary electric power generation, the solid oxide fuel cell is interesting, since it can be powered directly by natural gas, and has a high efficiency when compared to thermal machines; yet their exhaust gases have a temperature and pressure suitable for insertion in gas microturbines, which increases the system's efficiency. This study looks at the modeling of the solid oxide fuel cell and gas microturbine as well as the performance analysis from simulations in Electromagnetic Transient Software (PSCAD/EMTDC).     

EMTP based simulation of a self-excited induction generator afterits disconnection from the grid

A study of the application of an induction generator (IG) in power systems is presented in this paper. The Electromagnetic Transients Program (EMTP) is used to investigate the self-excitation phenomenon and the dynamic behaviour of the induction generator, resulting from the grid disconnection. The results demonstrate that, if the amount of the external reactive power source is sufficient to ensure self-excitation of the induction generator, high and abnormal overvoltages occur which can be dangerous for the insulation integrity of the nonutility generator (NUG) equipment, the local load and, even worse, for the maintenance personnel     

PSCAD/EMTDC-based simulation of wind power generation system

This paper proposes a novel simulation method of wind power generation system (WPGS) using PSCAD/EMTDC. The pitch control-based rotation speed control scheme of turbine under variable wind speed is implemented. For the purpose of achieving effective and user-friendly simulation method for utility interactive (grid connected) WPGS, real weather condition-based WPGS simulation (RW–WPGS) is performed using PSCAD/EMTDC. It is not easy, in general, to consider the RW conditions in the WPGS simulation using the EMTP or PSPICE type of simulators. External parameters of the RW conditions, however, are necessary to improve the simulation accuracy.The components modeling of wind turbine system is also studied and the real weather conditions are introduced by the interface method of a non-linear external parameter of the PSCAD/EMTDC. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme.     

State space relay modeling and simulation using the ElectroMagneticTransients Program and its transient analysis of control systemscapability

A simulation of a MHO distance relay is developed to study the effect of its operation under various system conditions. Simulation is accomplished using a state-space approach and a modeling technique using the ElectroMagnetic Transient Program (EMTP) and Transient Analysis of Control Systems (TACS). EMTP allows the representation of power systems as well as their components. In addition, transmission line surges and other high-frequency transient phenomena can be studied with EMTP. The EMTP modeling technique TACS is employed to develop this relay model. Simulation results are compared with those obtained in another independent study as a control, to validate the results. A data code for the practical utilization of this simulation is given. Because the model can accept waveforms from potential and current transformers, projections of harmonic and transient behavior of relays during a system contingency are possible     

面向次同步振荡分析的直驱风电机群建模

针对低运行工况下直驱风电机群并网出现的次同步振荡(SSO)问题,基于图形化分块建模,在建立风力机、集电线路及电网等独立元件的模型基础上,构造不同集电线路拓扑结构下直驱风电机群的线性化模型.利用特征值分析法和阻抗分析法识别系统中存在的振荡模式,并分析运行工况、电流内环控制参数和风力机数量等因素对SSO频率和阻尼的影响.研...     

A simplified fault currents analysis method considering transientof synchronous machine

The transient fault currents of a synchronous machine fault were mathematically analyzed by using the two-reaction theory, Clarke's components, etc. However, the methods were extremely complicated and the transient fault analysis of synchronous machine with a load was not carried out except for three-phase faults. This paper proposes a simplified fault currents analysis method considering synchronous machine transients. The method is based on the symmetrical components scheme. The advantages of the method are that the transient analysis is able to be accomplished more easily than the conventional method when the fault point is a synchronous machine terminal or a transmission line. The accuracy of the method is confirmed by comparing the analysis results with Electro-Magnetic Transient Program (EMTP) digital simulations