A start-stop bus compensation method for a terminal low-voltage treatment device

Abstract

The invention discloses a start-stop busbar compensation method of a terminal low-voltage treatment device, which utilizes the characteristics of busbar energy storage to set corresponding thresholds to calculate load voltage threshold ULoad, busbar upper limit UdcMax, busbar lower limit UdcMin, and each busbar compensation stage. The number of starts and stops N and the rms value of the minimum interval td between the two bus compensations, according to the relative relationship to determine whether the bus compensation is enabled, and the charging and discharging process of the bus when the bus compensation is enabled, so as to realize the start of the motor. Within a few cycles, the voltage compensation is realized through the energy of the bus capacitor, which maximizes the voltage across the motor, so that the motor has a higher probability to start normally.

Description

technical field [0001] The invention relates to the field of power quality control, in particular to a start-stop bus compensation method for a terminal low-voltage control device. Background technique [0002] In the rural grid station area, especially in remote mountainous areas, the end users may experience low power supply voltage problems due to the long end line or the high load rate of the front end users. For such low-voltage problems of users, low-voltage management devices need to be used for management. [0003] The capacity of the low-voltage treatment device itself is certain, and the capacity of the line is also certain. Therefore, the maximum voltage compensation capability of the low-voltage treatment device on a specific line is relatively certain, and it may only drive the rated power of 10kW or 20kW. It is feasible for the voltage management device to compensate for ordinary household appliances, but there are some electrical equipment in some homes, such...

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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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