The paper analyses the dynamic process of HVDC converter, including voltage characteristic of converter AC bus, phase-locked loop (PLL) and the commutation characteristic of valve, when single-phase earth fault occurs in AC system, which is the most typical fault among all AC system faults.
以最常见的交流系统单相接地故障为例,详细分析了 HVDC换流器的动态过程,包括换流母线电压特性、锁相环输出特性和阀换相特性。
This paper proposed a fast and high precision measuring method to measure the power of AC system.
提出了一种采用现场可编程门阵列(简称FPGA)实现交流系统功率测量的方法。
In this paper the mathematical and physical model of an AC system and VSC-HVDC system are developed and analyzed.
将基于电压源换流器高压直流输电系统(VSC-HVDC)引入到交流系统中,建立了含有VSC-HVDC的电力系统的仿真模型,导出了相应的数学模型,利用VSC-HVDC能同时对有功功率和无功功率进行快速控制的特点来提高系统频率和电压稳定性。
A new segment solution for solving load margin of AC/DC power system is proposed in this paper based on continuation method and interior point algorithm.
基于连续潮流法和原始-对偶内点法,提出了一种新的分段求解交直流系统负荷裕度方法。
In load flow calculation of AC/DC power system the adjustment of converter transformer’s tap changer is taken into account, the mathematical model and method to adjust the position of taps are proposed and their simulation results for two-terminal and three-terminal HVDC transmission systems are given.
分析了直流输电系统中换流变压器的作用,在交直流系统潮流计算中考虑了换流变压器分接头的调整,提出了调整分接头档位的方法,并通过两个算例系统进行了仿真。
The assumption of the AC commutating voltages being unchanged during the fast HVDC simulation can affect the results of the two-time-step transient stability simulation of the AC/DC power system.
分析在直流小步长仿真过程中假设换流母线的交流电压不变对交直流系统双时步暂态稳定性仿真结果产生的影响及原因:该假设可能会延迟直流系统中一些具有开关特性的控制器的动作时间,造成仿真结果不准确;对于多馈入直流系统甚至可能引起直流开关特性控制的误动作,从而使仿真结果失真。
Considering the variable constraints of DC system,the adjustment of operation mode and convergence during assessing the voltage stability of AC/DC power systems,this paper proposes a new segment method for solving load margin of AC/DC power system based on the primal-dual interior point algorithm.
针对交直流系统稳定分析时直流变量约束、运行方式调整以及计算收敛性问题,基于原始-对偶内点法提出分段求解交直流系统负荷裕度的新算法。
System for Technology Exchange for Natural Disasters
自然灾害技术交流系统
Short-circuit current calculation in three-phase a.c.systems
GB/T15544-1995三相交流系统短路电流计算
Research on the DC Current Distribution in AC Power System Caused by an HVDC System;
HVDC输电系统入地电流在交流系统中分布的研究
It should be noted that the DC transmission system does not contribute to the fault current flowing in the AC system5 during the AC faults.
应注意到,直流输电系统并不会增加交流系统故障时的故障电流。
Silicon carbide surge arresters for A.C.systems
GB7327-1987交流系统用碳化硅阀式避雷器
Science and Technology Policy Information Exchange System-SPINES
科学技术政策情报交流系统
automatic electric AC drives
交流自动电力传动系统
AC single phase two wire insulated system
交流单相双线绝缘系统
AC single phase three wire insulated system
交流单机三线绝缘系统
AC three phase three wire insulated system
交流三相三线绝缘系统
Research on Intelligent Control System of Intersection for Hybrid Traffic Flow;
交叉口混合交通流智能控制系统研究
The Study on A Forecasting System for Short-term Traffic Flow in ITS;
智能交通系统中短时交通流预测系统的研究
Active Filter Technique on AC-side of HVDC Transmission Systems
直流输电系统交流侧的有源滤波技术
Power Flow Calculation of the VSC-MTDC and AC Hybrid Power System;
VSC-MTDC和交流混合的电力系统潮流计算
Simulation of AC Speed Control System Based on PWM Rectifier
基于PWM整流器的交流调速系统的仿真
Simulation and Study on AC-AC Excitation System for AC Excited Generator;
交流励磁发电机交—交励磁系统仿真研究
UNIFIED FUNDAMENTAL FREQUENCY AND HARMONIC LOAD FLOW SOLUTION IN AC/DC POWER SYSTEMS
交直流电力系统中统一基波和谐波潮流解
The common power sources for the excitation system produce an alternating current; therefore a means of rectifying the alternating current becomes necessary.
励磁系统通常的电源是交流电,因此必须具有将交流电整流的措施。
