Substation Voltage / Reactive Power Integrated Control Research And Development Of On-load Tap Monitoring System,

With the consideration of most of our transformers' taps are changed manually and some fluctuate unnecessarily, this paper presents a supervision system of OLTC based on PLC control technique. Then we combine this system with reactive power compensate device such as shunt capacitor to design a new supervision system of substation voltage and reactive power synthetic control based on PLC fieldbus. This system takes PLC to gather the real data, discriminate the state and control the output. Also this system transfers field information through PROFIBUS-DP, which make it as an intact distributed supervision system. In the last part of this paper, a new control theory based on fuzzy neural network of substation voltage and reactive power synthetic control is presented. Besides the guarantee of reactive power equilibrium and voltage quality, this theory can minimize the OLTC Tap_Changers' operation times. In order to avoid the frequent action of OLTC Tap_Changers caused by voltage fluctuation, inverse-time is introduced to this system that enhance the quality of voltage.