Automatic capacitance-adjusting capacitor device

Abstract

The invention discloses an automatic capacitance-adjusting capacitor device. The device comprises an integrated parallel capacitor, a non-excited regulating switch, an electric controller and an automatic controller, wherein the integrated parallel capacitor comprises capacitor units of which three phases are the same, and each phase of capacitor unit consists of a parallel capacitor bank, a reactor and a discharge coil; the wire inlet end of the parallel capacitor bank is connected in series with the reactor, and the parallel capacitor bank is connected in parallel with the discharge coil; two parallel capacitors are arranged in the parallel capacitor bank, and the wire outlet end of each capacitor is connected in series with different contacts of the non-excited regulating switch to form a neutral point; and a secondary circuit of the non-excited regulating switch is connected with the electric controller, and the electric controller is connected with the automatic controller. The automatic capacitance-adjusting capacitor device overcomes the defect that the capacitance cannot be adjusted automatically in the conventional integrated capacitor, compensates the reactive power of electric power circuits automatically according to the comprehensive judgment on power grid voltage and power factors, and solves the problems of the overcompensation and undercompensation of the reactive power.

Description

technical field [0001] The invention belongs to the technical field of power devices, and in particular relates to reactive power compensation capacitors widely used in power systems. Background technique [0002] Since the reactive power in the power system occupies the capacity of the power supply and distribution equipment and increases the loss of the line, the grid voltage drops and the power factor decreases, which seriously affects the power quality and the economic operation of the grid. From the perspective of power users , The reactive power cannot be balanced on the spot, and the intuitive performance is that the power factor is low, and the generated reactive power impact causes the voltage drop of the grid. Voltage fluctuation and flicker; the generated high-order harmonics distort the grid voltage, causing a series of adverse effects such as protection device malfunction, capacitor overload and overvoltage, increased loss of electrical equipment, heat generatio...

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Problems solved by technology

[0002] Since the reactive power in the power system occupies the capacity of the power supply and distribution equipment and increases the loss of the line, the grid voltage drops and the power factor decreases, which seriously affects the power quality and the economic operation of the grid. From the perspective of power users , the reactive power cannot be balanced locally, and the intuitive performance is that the power factor is low, and the reactive power impact caused by the grid voltage drop

Voltage fluctuation and flicker; the generated high-order harmonics distort the grid voltage, causing a series of adverse effects such as protection device malfunction, capacitor overload and overvoltage, increased loss of electrical equipment, heat generation, and easy aging of insulation

With the development of the national economy, the power loads of various industries have increased significantly. Among the newly added loads, the reactive power load has increased the loss of the power supply system. However, most of the substations in my country's current distribution network use fixed collective capacitor banks for reactive power compensation. Due to the lack of reactive power adjustment means, the power factor fluctuates greatly during the peak and valley of power supply, and the problem of over-compensation and under-compensation often occurs

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