基于超级电容的静止无功补偿器的研究，

为了实现在配电网骤降时同时补偿有功能和无功功率的目的,采用Buck／Boost型双向直流变换器连接超级电容储能装置与静止无功补偿器这一结构的电压一电流双闭环PI控制方法,通过Matlab／Simulink软件,做了相关仿真实验,得到了超级电容无论吸收功率,还是释放功率,其直流母线侧电压均恒定的结果,整个装置具有既能补偿无功功率损失又能补偿有功功率损失的特点。     

配电网无功补偿分析

本文针对配电网无功功率补偿技术进行分析,论述了高、中、低压电网无功补偿的主要方式,分析了无功功率补偿装置的设备选型,提出了提高配电网的功率因数,增强电压稳定性的方法.     

低压无功补偿技术概述

随着用电规模的不断扩大,大量低功率因数的负荷接入电网,引起了严重的电能质量问题。为实现电网的安全稳定运行,需要平衡负荷无功功率,无功补偿是实现这一目标的关键技术。本文结合低压无功功率补偿装置的发展趋势,对低压无功补偿技术进行概述分析,研究表明基于并联电容器的低压无功功率补偿装置能够对电网中大量存在的感性无功负载进行有效的补偿,是目前应用最为广泛的无功补偿设备。     

静止同步补偿器STATCOM的d-q直接电流控制仿真

近年来,电力网中电压不平衡给系统带来很多危害,无功电流的补偿已成为亟待解决的问题,传统无功补偿装置已经远不能满足要求,新型静止同步补偿器STATCOM应运而生。本文研究静止同步补偿器STATCOM的工作原理、数学模型、无功功率理论和直接电流控制方法,实现无功功率补偿方式。在对STATCOM模型的建立进行了深入研究的同时,采用d-q电流直接控制法对STATCOM进行了仿真分析。     

低压无功补偿电容投切装置的设计

在电力系统中装设静止无功补偿装置(SVC)是控制无功功率、保证电压质量的有效手段,他根据无功功率的需求,对无功器件(电容器和电抗器)进行投切或调节。晶闸管投切电容器(TSC)是静止无功补偿技术的发展方向,这种装置的关键问题是如何对作为电容器投切开关的晶闸管进行控制。针对TSC低压无功补偿装置的结构,对晶闸管的触发电路进行详细的设计和分析,仿真结果证明了设计的正确性。     

一种新型的无功补偿装置研究

提出了一种可以连续调节无功的新型无功补偿电路结构。该结构采用串联电感逆变器并联固定电容器接入电网实现无功功率的补偿,其中固定电容器用来提供恒定的感性无功功率,电压型逆变器用来实现无功功率的平滑无级调节。该逆变器采用固定调制比和调电容直压的控制方式,控制简便灵活。通过仿真及实验分析,该补偿设备较TCR有体积小、损耗低、响应速度快、产生谐波少、实现快速补偿动态无功,能够实现容性无功功率的连续调节。     

一种新型TSF动态无功功率补偿装置的原理和应用

主要阐述这种新型TSF动态无功功率补偿装置的特点、工作原理、控制思想及其在宝钢集团上海五钢有限公司的应用效果。给出了基波无功功率的快速计算方法。     

功率因数闭环控制在变负载进相器上的研究与应用

进相器作为专为大中型绕线式异步电机节能降耗设计的无功功率就地补偿装置,相对其它补偿装置优势明显,广泛运用于各工业场合。本文针对现有进相器存在的补偿电压不能动态调节的问题,提出根据面积等效原理,对进相器的控制进行改进,实现补偿电压动态调节,进而实现按功率因数闭环控制的功能,研究成果应用于实际现场,并取得良好的应用效果。     

模块化多电平静止无功补偿器控制策略研究

随着多电平逆变器在电力系统无功功率补偿领域的广泛应用,提出了一种基于模块化多电平( MMC)技术的新型静止无功补偿器( STATCOM)的拓扑结构。该拓扑结构具有模块化程度高、可靠性好、便于维护及容量拓展等特点,是一种极具发展潜力的拓扑结构。首先对MMC-STATCOM的工作原理和数学模型进行了分析,提出了无功功率解耦控制策略以及提出了一种新的控制子模块电容电压平衡的控制算法。仿真和测试结果均表明MMC-STATCOM具有补偿效果好,动态响应速度快等优点,是一种具有工程应用价值的大容量STATCOM主电路拓扑。     

基于CPLD的可控电抗控制器

分析了磁阀式可控电抗器的工作原理，采用复杂的可编程逻辑器件(CPLD)为其设计了控制装置，实现了电抗器容量的自动连续调节，具有响应速度快、可靠性高的特点，在电力系统无功补偿的实际应用中效果良好。     

基于三相并联混合有源滤波器的直接功率控制理论

文中研究的目的是使并联混合型有源电力滤波器取得更好的性价比。由于大功率的电力电子器件（GTO／IGCT）不能应用在高于10kHz,电流控制综合使用了同步参考坐标（SRF）和瞬时无功功率（IRP）的直接功率控制方法,而且IRP的矢量算法没有使用变换矩阵。这种方法的可行性用MATLAB的仿真结果得以证实。     

Improved control for high power static var compensator using novel vector product phase locked loop (VP-PLL)

This paper presents a new dual loop control using novel vector product phase locked loop (VP-PLL) for a high power static var compensator (SVC) with three-level GTO voltage source inverter (VSI). From a simple dq-axis equivalent circuit obtained by circuit DQ-transformation method, steady-state analysis is achieved for maximum controllable phase angle α_max per unit current between AC source and switching function of inverter. In addition, the system parameters L and C are designed and thus transient analysis is made for open-loop transfer function. This paper proposes software VP-PLL for more accurate α control than conventional hardware PLL because α_max becomes very small in high power SVC. Therefore, the overall controller has dual loop structure of inner VP-PLL for synchronizing the phase angle with AC source and outer Q-loop for compensating reactive power of load. Finally, the usability of the proposed control method is verified through the experiment of 100kvar power capacity with both stand alone and load linked operation.     

三相故障时双馈风力发电机并网稳定性的改进

为使风电并网后的能够稳定运行,从双馈风电机组的自身特点为角度分析双馈风力发电并网对电网系统稳定性的影响,以Matlab/Simulink为平台搭建风电并网的模型,模拟仿真双馈风机在三相故障时加入两种无功补偿装置后的情况,比较得到最优的无功补偿装置以改进风电在并网时的稳定性。结果表明,静止同步补偿器在提升风电并网电力系统稳定性比SVC静态无功补偿器方面有更好的效果。     

Instantaneous control method with a GTO converter for active andreactive powers in superconducting magnetic energy storage

A new type of GPG (gate pulse generator) is presented to give GTO power converters quick response firing angle control and PWM control functions. Using the GPG, an instantaneous control method of active and reactive powers for an SMES (superconducting magnetic energy storage) employing one GTO converter is studied     

Enhancement of Distributed Generation by Using Custom Power Device

Wind energy (WE) has become immensely popular for distributed generation (DG). This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device (CPD) is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator (DSTATCOM), is utilized for injecting the wind power to the point of common coupling (PCC) and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.     

Low-harmonic GTO converter for fundamental power factorcompensation

A low-harmonic GTO (gate turn-off) thyristor AC-to-DC converter with line current lead-lag phase shift control ability is proposed and analyzed. The converter can be used either as a low-harmonic GTO-controlled rectifier or a fundamental input power factor compensator in a power supply system. The effect of PWM (pulse width modulation) current phase number on the harmonic contents and converter output voltage control range is investigated. Lower order input current harmonics are eliminated over a wide range, using a specially designed PWM current pattern. The effect of the PWM current pulse number on the power factor compensation characteristic is investigated     

配电网静止同步补偿器在江西电网中的仿真应用

配电网静止同步补偿器（DSTATCOM）是一种能够快速提供大容量无功功率的新型电力电子装置,能提高故障时电力系统暂态稳定性和抑制电压闪变等。DSTATCOM比其他的FACTS装置有更为优越的性能。以江西省电力科学院设计的电力系统综合程序／用户程序接口（PSASP／UPI）为工具,对江西电网应用DSTATCOM装置前后的暂态过程进行对比分析,研究了DSTATCOM在提高江西电网电压水平,改善江西电网暂态稳定性方面的效果。     

Control and performance of a self-commutated GTO converter operating in parallel with line-commutated thyristor converters

Recently, static var generators (SVGs) or static synchronous compensators based on self-commutated converters have been put into practical use for the purpose of compensation for reactive power, power swings damping, and/or voltage control in power systems. The SVGs have also been applied to reduce voltage fluctuations appearing at high-speed train substations. When parallel resonance occurs between passive filters installed at a point of common coupling (PCC) and the power-system impedance existing upstream of the PCC, voltage/current harmonics are significantly amplified in the power system. This paper describes the control and performance for a self-commutated gate-turn-off (GTO) converter operating in parallel with conventional line-commutated thyristor converters. This hybrid power conversion system rated at more than dozens of MVA has an inductive load at the dc side. A bank of passive filters is connected not only for harmonic compensation of the line-commutated converters, but also as a constant leading reactive-power source. The GTO converter can control either leading or lagging reactive power so as to achieve unity power factor operation. In addition, it has the capability of damping out parallel resonance between the passive filters and the power-system impedance. This paper confirms the viability and effectiveness of the hybrid system by means of theory and computer simulation.     

一种带有注入增强缓冲层的4H-SiC GTO晶闸管

门极可关断(GTO)晶闸管是应用在脉冲功率领域中的一种重要的功率器件。目前,由于常规SiC GTO晶闸管的阴极注入效率较低,限制了器件性能的提高。提出了一种带有注入增强缓冲层的碳化硅门极可关断(IEB-GTO)晶闸管结构,相比于常规GTO晶闸管结构,该结构有着更高的阴极注入效率,从而减小了器件的导通电阻和功耗。仿真结果表明,当导通电流为1 000 A/cm^2时,IEB-GTO晶闸管的比导通电阻比常规GTO晶闸管下降了约45.5%;在脉冲峰值电流为6 000 A、半周期为1 ms的宽脉冲放电过程中,器件的最大导通压降比常规GTO晶闸管降低了约58.5%。