Intelligent power distribution and utilization flexible control system

Abstract

The invention discloses an intelligent power distribution and utilization flexible control system. The intelligent power distribution and utilization flexible control system comprises a transformer, a three-phase rectifier, at least one single-phase inverter and at least one three-phase inverter. The three-phase rectifier converts a three-phase alternating current produced by the transformer into a direct current which is output to the inverters, the single-phase inverters convert the direct current into single-phase alternating currents with adjustable frequency and amplitude, and the three-phase inverters convert the direct current into three-phase alternating currents with adjustable frequency and amplitude. According to the intelligent power distribution and utilization flexible control system, the method that the three-phase alternating current is rectified and then inverted is adopted, the problem that a great deal of single-phase electric equipment is directly connected to a power supply grid to cause three-phase unbalance is solved, damage to power transmission and distribution equipment and the electric equipment is reduced, and reliability, economical efficiency and power quality of power supply are improved. Besides, the intelligent power distribution and utilization flexible control system achieves clear work division of modules, is easy to design, build and maintain, operates easily, and achieves convenient system expansion and upgrading.

Description

technical field [0001] The invention relates to the technical field of power distribution network, and more specifically, to an intelligent flexible control system for power distribution and utilization. Background technique [0002] Three-phase unbalance means that the three-phase current (or voltage) amplitudes in the power system are inconsistent, and the amplitude difference exceeds the specified range. The harm caused by the specific three-phase unbalance problem is as follows: [0003] 1. Harm to the transformer: In production and domestic electricity consumption, when the three-phase load is unbalanced, the transformer is in an asymmetrical operation state, resulting in increased loss and reduced utilization of the transformer. At the same time, it will also cause the zero-sequence current of the transformer to be too large, and the temperature of some metal parts will increase, which may seriously cause the transformer to burn out; [0004] 2. Harm to electrical eq...

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Problems solved by technology

[0003] 1. Harm to the transformer: In production and domestic electricity consumption, when the three-phase load is unbalanced, the transformer is in an asymmetrical operation state, resulting in increased loss and reduced utilization of the transformer

At the same time, it will also cause the zero-sequence current of the transformer to be too large, and the temperature of some metal parts will increase, which may seriously cause the transformer to burn out;

[0004] 2. Harm to electrical equipment: Unbalanced three-phase will generate several times of unbalanced current, which will induce an increase in the reverse torque of the motor, increase the temperature of the motor, decrease efficiency, and aggravate vibration, resulting in a reduction in the service life of electrical equipment and accelerated use. Aging of electrical equipment;

[0005] 3. The impact on the line: the three-phase load is unbalanced, resulting in the current passing through the neutral line, which increases the loss of the power supply line

The unbalanced three-phase load of the low-voltage power grid may cause excessive current in a certain high-voltage phase, resulting in high-voltage line overcurrent tripping and power outages, and frequent tripping and power outages of switchgear in substations, reducing the service life of switchgear

[0006] Therefore, the three-phase unbalance problem not only has a serious impact on the economical and reliable operation of the power supply grid, but also reduces the power quality of users and the reliability of power supply

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