Voltage control circuit system based on power spring and control method and device

Abstract

The invention provides a voltage control circuit system based on a power spring and a control method and device. All user loads in a circuit are connected with the outlet side of the power spring in series. The method comprises the steps that S1, on the basis of voltages at the two ends of each user load and a load rated voltage reference value, an expected voltage amplitude of the power spring isobtained by sequentially using an optimal output tracker and a proportional integral controller; S2, on the basis of the deviation of the effective values of the voltages at the two ends of each userload and the load rated voltage reference value and the phase angle of branch current of each user load, an expected voltage phase angle of the power spring is obtained by means of an operation modeselector; S3, on the basis of the expected voltage amplitude and the expected voltage phase angle of the power spring, a signal generator is used for acquiring a driving control signal of the power spring. According to the method, the voltage quality of the loads in the circuit can be comprehensively balanced, and the applicability and practicability of the system can be effectively improved.

Description

Technical field [0001] The present invention relates to the technical field of smart grid control, and more specifically, to a voltage control circuit system, control method and device based on a power spring. Background technique [0002] The development of the electric power industry and the increase in dependence on electric power have made users put forward higher requirements for the stability and reliability of power supply. The judgment standard of power quality is no longer limited to the duration and frequency of power supply interruptions, but also involves The stability of the supply voltage, and whether its effective value has been stable within the rated range. [0003] According to the statistics of the State Grid Corporation of my country, due to the rapid development of power demand in China, the construction of power supply facilities cannot keep up with the development speed of power demand. Therefore, although the voltage qualification rate of the power grid in u...

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Problems solved by technology

It can be seen that the input voltage control method of the traditional electric spring is to ensure the voltage quality of the critical load by sacrificing the voltage quality of the non-critical load, which will lead to the deterioration of the voltage quality of the non-critical load. At the same time, there is no clear distinction between the critical load and the non-critical load. Under standard circumstances, it is difficult to carry out large-scale promotion

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