Imbalance and reactive compensation type comprehensive control system and method thereof

Abstract

The invention discloses an imbalance and reactive compensation type comprehensive control system and a method thereof. The system comprises a comprehensive controller and a plurality of interphase compensation devices. The specific method comprises the following steps: detecting voltage and current of a distribution transform outlet, and calculating active power, reactive power, a power factor, a voltage qualification rate and a three-phase imbalance degree Epsilon; judging whether the voltage of a phase exceeds a voltage upper limit and is lower than a voltage lower limit; if the voltage of the phase exceeds the voltage upper limit, issuing a command for eliminating the compensation devices between the phase and zero; if the voltage of the phase exceeds the voltage lower limit, issuing a command for putting the compensation devices between a phase line and a zero line into operation; if the voltage of the phase falls within the range from the voltage lower limit to the voltage upper limit, judging whether the three-phase imbalance degree Epsilon is qualified; and if Epsilon is larger than Epsilon0, issuing a command for operating the compensation devices between the phase line and the zero line according to an imbalance compensation algorithm, and otherwise, issuing a command for operating the compensation devices between the phase and zero and the compensation devices between the phase and another phase. According to the imbalance and reactive compensation type comprehensive control system and the method thereof, the power factor of a power system, and the voltage qualification rate and the power supplying reliability of a rural power grid can be improved.

Description

technical field [0001] The invention relates to an unbalanced and reactive power compensation comprehensive control system and a method thereof, belonging to the technical field of power distribution networks. Background technique [0002] With the rapid development of the rural economy, the demand for electric energy is growing rapidly, and the process of urbanization of the new countryside is accelerating, especially the implementation of a series of policies to benefit farmers such as "home appliances to the countryside", and the rural electricity consumption and electricity load are increasing day by day. Climbing, rural electricity demand is increasing day by day. Unsatisfactory reactive power management in low-voltage lines of power distribution in rural power grids, serious unbalanced three-phase loads, and severe overloading of power distribution capacity have all led to serious low-voltage problems in rural power grids and restricted the development of rural economi...

AI Technical Summary

Problems solved by technology

Unsatisfactory reactive power management in low-voltage lines of power distribution in rural power grids, serious unbalanced three-phase loads, and severe overloading of power distribution capacity all lead to serious low-voltage problems in rural power grids and restrict the development of rural economy

[0003] The three-phase load imbalance in the rural power grid is serious, and the single-phase load capacity often exceeds the distribution transformer capacity, while the other two phases are light-loaded, resulting in insufficient distribution transformer capacity and low voltage; reactive power in the rural power grid The penetration rate of compensation is not high. Even if power capacitors are used, the capacitors are easily damaged due to problems such as harmonics, and cannot be put into normal operation. At the same time, the capacitors also have the problems of low compensation accuracy and insufficient response speed.

Images