Three-phase current balance power distribution control system

Abstract

The utility model relates to the technical field of electric power control, in particular to a three-phase current balance power distribution control system, which solves the problem that in a low-voltage power distribution system, random access of a single-phase load is easy to cause three-phase current imbalance. A three-phase current balance power distribution control system comprises an input power supply used for providing a three-phase alternating current power supply; the single loads are mutually connected in parallel and are electrically connected with the input power supply; the three-phase balance converters are used for transferring current from a heavy-load phase to a light-load phase, and the three-phase balance converters are located in circuits of single loads respectively; and the three-phase balance controller is used for monitoring and adjusting the balance of the three-phase current in real time. According to the utility model, the three-phase circuit system is regulated and controlled in real time through the three-phase balance controller, the three-phase unbalance degree of the circuit system is reduced, the service life of connecting equipment is prolonged, the electric energy loss is reduced, and the comprehensive energy efficiency of the system is improved by reducing the neutral current and line loss.

Description

Technical Field

[0001] This utility model relates to the field of power control technology, and in particular to a three-phase current balance power distribution control system. Background Technology

[0002] In low-voltage power distribution systems, the random connection of single-phase loads can easily lead to three-phase current imbalance. When a single-phase load is connected or disconnected, it will cause three-phase current imbalance. This will increase the loss of power system lines, cause voltage fluctuations and flicker, metering errors, and damage to power equipment, resulting in economic losses for users.

[0003] Traditional solutions rely on manual load adjustment or the use of static compensation devices, but these solutions suffer from drawbacks such as slow response, low adjustment accuracy, and inability to dynamically adapt to load changes.

[0004] Therefore, a three-phase current balance power distribution control system is proposed. Utility Model Content

[0005] The purpose of this invention is to address the problems that current imbalance solutions for three-phase current rely on manual load adjustment or the use of static compensation devices, which suffer from drawbacks such as slow response, low adjustment accuracy, and inability to dynamically adapt to load changes. This invention provides a three-phase current balance distribution control system.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A three-phase current balancing power distribution control system includes an input power supply for providing three-phase AC power; several groups of single-phase loads connected in parallel and electrically connected to the input power supply; several three-phase balancing converters for transferring current from the heavily loaded phase to the lightly loaded phase, each three-phase balancing converter being located within the circuit of a single-phase load; and a three-phase balancing controller for real-time monitoring and adjustment of the three-phase current balance.

[0008] Furthermore, the three-phase balanced converter adopts a modular IGBT bridge arm structure to form a power electronic module, and supports multi-level parallel expansion.

[0009] Furthermore, the three-phase balance controller is connected to a smart monitoring power meter, which is based on a microprocessor (MPA) design and has a built-in high-precision current sensor.

[0010] Furthermore, the input power supply and single-phase load integrate several circuit breakers and disconnect switches to control the safe switching on and off of the circuit system.

[0011] The beneficial effects of this utility model are as follows:

[0012] By using a three-phase balance controller to regulate the three-phase circuit system in real time, the three-phase imbalance of the circuit system is reduced, the service life of connected equipment is extended, and power loss is reduced. By reducing neutral line current and line loss, the overall energy efficiency of the system is improved. It is suitable for industrial, commercial and residential power distribution scenarios and has high economic efficiency and reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the circuit connection structure of this utility model;

[0014] Reference numerals in the attached diagram: 1. Input power supply; 2. Single-phase load; 3. Three-phase balancing converter; 4. Three-phase balancing controller; 5. Smart monitoring power meter; 6. Circuit breaker; 7. Disconnecting switch. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Reference Figure 1A three-phase current balancing power distribution control system includes an input power supply 1 for providing three-phase AC power; several groups of single-phase loads 2, which are connected in parallel and electrically connected to the input power supply 1; the input power supply 1 and the single-phase loads 2 integrate several circuit breakers 6 and disconnect switches 7 for controlling the safe switching of the circuit system; several three-phase balancing converters 3 for transferring current from the heavily loaded phase to the lightly loaded phase; the three-phase balancing converters 3 are located in the circuit of each single-phase load 2; the three-phase balancing converters 3 adopt a modular IGBT bridge arm structure to form power electronic modules and support multi-level parallel expansion; and a three-phase balancing controller 4 for real-time monitoring and adjustment of the three-phase current balance; the three-phase balancing controller 4 is connected to an intelligent monitoring power meter, which is based on a microprocessor (MPA) design and has a built-in high-precision current sensor.

[0020] In specific implementation cases, smart monitoring power meters are installed in the original power supply system or circuit to collect and monitor the real-time power consumption of the three phases L1, L2, and L3 of each power supply system. The real-time data is transmitted to the three-phase balance controller 4 via a signal line through the network. Three-phase power converters are set at the output terminals of the three-phase balance controller 4 and each power supply circuit. The smart monitoring power meter collects the real-time current of each phase of the power supply system and transmits it to the three-phase balance controller 4 via a signal. When a new load is added or disconnected, the three-phase balance controller 4 will transmit a signal to the three-phase balance converter 3 based on the real-time dynamic data of the smart monitoring power meter, and switch the new load to a phase with a low real-time current.

[0021] In a possible implementation scenario, when a new single-phase load is connected, if the real-time three-phase current values ​​monitored by the smart power meter are L1 phase --- 100A, L2 phase --- 120A, and L3 phase --- 70A, the three-phase balance control distributor will automatically switch the new single-phase load to L3 phase power supply based on the above data.

Claims

1. A three-phase current balance power distribution control system, characterized in that, It includes an input power supply for providing three-phase AC power; several sets of single-phase loads connected in parallel and electrically connected to the input power supply; several three-phase balancing converters for transferring current from the heavily loaded phase to the lightly loaded phase, each three-phase balancing converter being located within the circuit of a single-phase load; and a three-phase balancing controller for real-time monitoring and adjustment of the three-phase current balance.

2. The three-phase current balance distribution control system according to claim 1, characterized in that, The three-phase balanced converter uses a modular IGBT bridge arm structure to form a power electronic module and supports multi-level parallel expansion.

3. A three-phase current balance power distribution control system according to claim 1, characterized in that, The three-phase balance controller is connected to an intelligent monitoring power meter, which is based on a microprocessor MPA design and has a built-in high-precision current sensor.

4. A three-phase current balance distribution control system according to claim 1, characterized in that, The input power supply and single-phase load integrate several circuit breakers and disconnect switches to control the safe switching on and off of the circuit system.

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