Start-stop type bus compensation method for tail end low-voltage treatment device

Abstract

The invention discloses a start-stop type bus compensation method for a tail end low-voltage treatment device. The method comprises the steps of setting a corresponding threshold value through employing the characteristics of bus energy storage, calculating a load voltage threshold value ULoad, a bus upper limit UdcMax, a bus lower limit UdcMin, the start-stop times N of each bus compensation stage, and the effective value of the minimum interval td between two times of bus compensation, according to the relative relation, judging whether bus compensation is enabled or not and the charging and discharging process of the bus when the bus compensation is enabled are judged, so that voltage compensation is achieved through bus capacitor energy within a plurality of cycles when the motor is just started, the voltage at the two ends of the motor is improved to the maximum extent, and the motor can be normally started with higher probability.

Description

technical field [0001] The invention relates to the field of electric energy quality control, in particular to a start-stop busbar compensation method for a terminal low-voltage control device. Background technique [0002] In rural power grid areas, especially in remote mountainous areas, the terminal users may suffer from low power supply voltage due to long terminal lines or high load rate of front-end users. For such user low-voltage problems, low-voltage control devices need to be used for treatment. [0003] The capacity of the low-voltage control device itself is fixed, and the capacity of the line is also fixed. Therefore, the maximum voltage compensation capability of the low-voltage control device on a specific line is relatively certain, and it may only drive a rated power of 10kW or 20kW. It is feasible for the voltage management device to compensate ordinary household appliances, but some households will have some motor equipment, such as water pumps, rice mach...

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Problems solved by technology

[0003] The capacity of the low-voltage control device itself is fixed, and the capacity of the line is also fixed. Therefore, the maximum voltage compensation capability of the low-voltage control device on a specific line is relatively certain, and it may only drive a rated power of 10kW or 20kW. It is feasible for the voltage management device to compensate ordinary household appliances, but some households will have some motor equipment, such as water pumps, rice machines, etc., when the motor equipment is just started, it is equivalent to several times the rated power at normal work, while the current The low-voltage control device is limited by the line capacity and equipment capacity. When starting, the voltage at both ends of the motor may not reach a certain value, and then the motor will not start, which affects the use of users and the safety of motor equipment.

[0004] The existing low-voltage control device does not use the method of busbar compensation, and the power consumption of users is dynamic. Only normal voltage compensation cannot make full use of the energy of the busbar, so the compensation effect is limited by the capacity of the line

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