摘要 提出了满足分相、分级、快速补偿要求的实用主电路，能有效地限制合闸涌流，抑制高次谐波。给出了以工业PC机为核心的控制器的硬件电路、快速检测无功的方法、晶闸管触发信号的控制要求,以及补偿装置的闭锁条件，解决了控制器应满足实时检测、快速响应和高可靠性等实际问题。详细说明了这种新型补偿装置的主电路、消除合闸时暂态过程的理论和方法，给出了实验结果。结果表明,这种装置在理论上是正确的，实践上是可行的，已用于研制的补偿装置。文中所提的方法原则上可用于高电压等级中的补偿。
关键词 无功补偿 电容器 晶闸管 工业计算机
PHASE－SPLITTING REACTIVE POWER COMPENSATION Chen Yunping Liu Huijin Peng Hui Fu Lijun Chen Qiongqiong ABSTRACT Dynamic phase－splitting compensation is the developing direction of reactive power compensation on the spot in low voltage distribution network. In this paper a practical main circuit is presented which can meet the need of phase－splitting, grading and fast compensation. This circuit can effectively suppress either the surge current at the instant of switching on the capacitors or the higher harmonics. The hardware of circuit of the controller based on industrial computer, the method of rapid measurement of reactive power, the control requirements on trigger pulse of thyristor and the shutoff conditions of the compensator are given. The practical problems, such as real－time detection, fast response and high reliability, have been solved. The main circuit of the new－style device and the theory of removing the effect of transient process at the instant of switching are illuminated and the result of experimentation is given. The result shows that this device is theoretically correct and feasible in practice. This device is used in the compensator developed by the authors. The method proposed in this paper can be used in high－voltage reactive power compensation in principle.
OF FIRST HARMONIC IN LOW VOLTAGE DISTRIBUTION NETWORK BY COMPUTER CONTROLLED THYRISTOR SWITCH
School of Electric Engineering, Wuhan University of Hydraulic & Electric Engineering
Wuhan, 430072 China
KEY WORDS reactive power; compensation capacitor; thyristor; industrial computer
Chen Yunping Liu Huijin Peng Hui Fu Lijun Chen Qiongqiong ABSTRACT Dynamic phase－splitting compensation is the developing direction of reactive power compensation on the spot in low voltage distribution network. In this paper a practical main circuit is presented which can meet the need of phase－splitting, grading and fast compensation. This circuit can effectively suppress either the surge current at the instant of switching on the capacitors or the higher harmonics. The hardware of circuit of the controller based on industrial computer, the method of rapid measurement of reactive power, the control requirements on trigger pulse of thyristor and the shutoff conditions of the compensator are given. The practical problems, such as real－time detection, fast response and high reliability, have been solved. The main circuit of the new－style device and the theory of removing the effect of transient process at the instant of switching are illuminated and the result of experimentation is given. The result shows that this device is theoretically correct and feasible in practice. This device is used in the compensator developed by the authors. The method proposed in this paper can be used in high－voltage reactive power compensation in principle.
School of Electric Engineering, Wuhan University of Hydraulic & Electric Engineering
Wuhan, 430072 China
KEY WORDS reactive power; compensation capacitor; thyristor; industrial computer
ABSTRACT Dynamic phase－splitting compensation is the developing direction of reactive power compensation on the spot in low voltage distribution network. In this paper a practical main circuit is presented which can meet the need of phase－splitting, grading and fast compensation. This circuit can effectively suppress either the surge current at the instant of switching on the capacitors or the higher harmonics. The hardware of circuit of the controller based on industrial computer, the method of rapid measurement of reactive power, the control requirements on trigger pulse of thyristor and the shutoff conditions of the compensator are given. The practical problems, such as real－time detection, fast response and high reliability, have been solved. The main circuit of the new－style device and the theory of removing the effect of transient process at the instant of switching are illuminated and the result of experimentation is given. The result shows that this device is theoretically correct and feasible in practice. This device is used in the compensator developed by the authors. The method proposed in this paper can be used in high－voltage reactive power compensation in principle.
KEY WORDS reactive power; compensation capacitor; thyristor; industrial computer
目前，低压并联电容器组大多采用三角形接法［1］，无功补偿均为静态补偿，以交流接触器作电力电容器的投切执行元件，投入时冲击电流大，切除时会产生过电压，自身触头易损甚至熔焊，噪声大，而且投切时间长。在控制环节上基本不能满足分相、分级、快速及跟踪补偿的要求。
基于上述问题，低压配电网应采用动态补偿。动态补偿是以晶闸管作为执行元件，用工业PC机进行控制，通过跟踪检测负荷的无功电流或无功功率，对多级电容器组进行分相投切。补偿效果快速、准确、安全、洁净及易于控制。此外，还可以对不平衡的无功功率进行完全补偿，这是以往的补偿装置难以胜任的。
