Controlling the Reactive Power Factor of a Combined Load Power Supply System and the Correction of Program as a Function of Current Power Consumption

Abstract

Reactive power (RP) factor automatic control system (ACS) applying the synchronous motor RP control as a function of the main perturbance effects, i.e. deviations of the real and reactive power in the power supply system components has been considered. Its use allows reducing the power loss during transmission, increasing the network transfer capability, and meeting regulatory requirements for the reactive power factors applicable to the consumers in the hours of the minimum and maximum daily loads of an enterprise. The control system includes a step-down transformer, a capacitor, asynchronous and synchronous motors, the excitation current control loop, and the real and reactive power communication links with relevant power transducers. The control system operating in a steady-state mode has been considered, the main requirement for which is to ensure a given error at the end of the billing period. The control system error $\Delta {tg} \varphi$ without and with a correction device is 0.024 and 0.01, respectively. The synchronous motor stability with negative excitation current self-feedback as the main control system component is ensured by adjusting this loop by the criterion of the weighted absolute error integral minimum. Herewith, the control quality indicators have been obtained: the response time does not exceed 0.1 s, and the overcontrol is less than five percent, which allows eliminating the reactive current overload of a synchronous motor. The control system operability has been approved on an experimental unit with asynchronous motors of a general-purpose industrial version and an EC52-4-M101 synchronous machine. This control system can be used in power supply systems of industrial enterprises, which include asynchronous and synchronous motors.