Automatic Control System of Load Bus Reactive Factor

摘要

For the purpose of the automatic control system (ACS)error decrease of the power grid load bus power factor angle tangent and the reduction of the reactive demand charge the mathematical model of the load bus was developed. The mathematical model that takes into account the voltage instability was built up of the following elements: a supply transmission line, a synchronous motor, asynchronous load and capacitor bank load. Based on this model and the results of the economic assessment, the ACS of the power grid load bus power factor angle tangent control with the synchronous electric drive was obtained. Different ways of control based on different feedback variables were compared on the steady-state error criterion. It is shown that ACS with a synchronous motor reactive power closed-loop control and compensation asynchronous load active/ reactive power closed-loop control has the lowest error. The ACS reference variable change program was obtained. The efficiency of the system was confirmed by the dynamic characteristics derived from the modeling of the asynchronous load switching. The developed model can be applied at industrial plants with capable synchronous motors. The correct system operation was proved by the testing on the laboratory test bench.