Emergency direct-current power supply trolley for transformer substation

Abstract

The invention relates to a transformer substation emergency direct current power supply trolley, which comprises a power supply system, an output system and a box body part, and is characterized in that the box body part comprises a box body and a plurality of brake universal wheels fixed at the bottom of the box body; the power supply system and the output system are arranged in the box body; the power supply system comprises a charging module unit, a control protection unit and a data display unit; the charging module unit is used for converting alternating current into direct current and storing electric quantity; the control protection unit is used for stabilizing voltage and controlling output current; the data display unit is used for displaying the output current and the output voltage; and the output system comprises a power switch unit and a feeder access unit and is used for outputting the current output by the power system to a direct current load. The technical scheme is low in cost, good in safety and high in practicability.

Description

Technical Field

[0001] The invention belongs to the technical field of direct current charging modules at a transformer substation equipment operation site, and in particular relates to an emergency direct current power supply trolley for a transformer substation. Background Art

[0002] The DC system of a substation is an important part of the secondary system of the substation. Its core component is the rectifier charging module. However, this module is prone to accidents such as lightning strikes and overcurrent burns during actual operation. Such faults are basically impossible to repair on-site. It takes a day or even several days to contact the manufacturer for replacement. During the replacement of the charging module, the DC system will operate with defects. At this time, if the remaining charging modules fail again, this will directly affect the safe and stable operation of the entire substation, leaving a huge hidden danger to safe and reliable power supply.

[0003] The paper "Research on Voltage Sag Management on Medium Voltage Distribution Network Side Based on Battery Energy Storage" proposed a voltage management topology of "parallel modular batteries and fast switches", established a mathematical model of this topology, and proposed a three-layer control strategy for this topology when the grid voltage is abnormal, including outer current three-phase decoupling tracking, middle-layer phase-to-phase SOC balancing, and inner-layer module component SOC balancing. However, there are difficulties in the actual application of this technology. The parallel batteries occupy a large area, and the voltage regulation effect is not ideal.

[0004] The paper "Research on DC Microgrid Control Based on Battery Energy Storage Optimization and Load Point State Balance" proposed a control method that simulates the characteristics of DC motors. Through the study of control methods and small signal modeling, the influence of inertia parameters and damping parameters in control was analyzed, and it was proved that the proposed control method can optimize the battery energy storage performance, enhance the anti-interference ability of the chest, and improve the flexibility of the busbar. However, the control method proposed by this technology has no obvious effect on the optimization of battery energy storage performance, and cannot solve the problems existing in the current DC charging module.

[0005] Therefore, in order to solve the problems caused by replacing the rectifier module, it is urgent to innovate a new equipment, new process and new method to solve the defects. Summary of the invention

[0006] The technical problem to be solved by the present invention is to make up for the deficiencies of the prior art and provide an emergency DC power supply trolley for a substation.

[0007] To solve the above technical problems, the technical solution of the present invention is: A substation emergency DC power supply trolley includes a power supply system, an output system and a box body, wherein the box body includes a box body and a plurality of brake universal wheels fixed at the bottom of the box body; the power supply system and the output system are both arranged in the box body; The power supply system includes a charging module unit, a control protection unit and a data display unit; the charging module unit is used to convert AC power into DC power and store power; the control protection unit is used to stabilize voltage and control output current; the data display unit is used to display output current and output voltage; The output system includes a power switch unit and a feeder access unit, and is used to output the current output by the power system to a DC load.

[0008] Furthermore, the control and protection unit of the power supply system is one of DSP control, single chip microcomputer control and microcomputer control.

[0009] Furthermore, the data display unit of the power supply system is one of a DC digital voltmeter and a pointer voltmeter.

[0010] Furthermore, there are multiple charging modules, and the multiple charging modules are connected in parallel.

[0011] The beneficial effects that can be achieved by the present invention are: (1) Safety benefits The mobile emergency DC power supply can quickly handle faults in the DC system charging module, reduce the time that equipment runs with defects, greatly shorten the fault handling time, improve the operating stability of the equipment, and ensure the safe and stable operation of the power grid.

[0012] (2) Economic benefits After adopting this device, the traditional charging module fault repair working mode has been changed, and the faulty charging module can be returned to the factory for repair.

[0013] (3) Prospective benefits It has low cost, good safety and strong practicality. After mass production by the manufacturer, it can be widely promoted and used in the emergency repair of charging module failures, and has huge market potential in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural block diagram of an embodiment of the present invention.

[0015] Figure 2 Schematic diagram of a power supply system in an embodiment of the present invention.

[0016] Figure 3 It is a structural block diagram of the output system in an embodiment of the present invention.

[0017] Figure 4 It is a front view of the box body in the embodiment of the present invention.

[0018] Figure 5 It is an axonometric view of the box body in the embodiment of the present invention.

[0019] In the figure: 1-box, 2-brake universal wheel. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] A transformer substation emergency DC power supply trolley comprises a power supply system, an output system and a box body, wherein the box body comprises a box body 1 and four brake universal wheels 2 fixed at the four corners of the bottom of the box body; the power supply system and the output system are both arranged in the box body 1.

[0022] The power supply system includes a charging module unit, a control protection unit and a data display unit; the charging module unit is used to convert AC power into DC power and store power; the control protection unit is used to stabilize voltage and control output current. In this embodiment, the control protection unit is specifically a Powersun-M3S control protection unit; the data display unit is used to display output current and output voltage. The data display unit in this embodiment is specifically a Powersun-M3S DC monitoring device. The number of charging module units in this embodiment is 3 charging modules with a capacity of 10A. The 3 charging modules are connected in parallel to meet the maximum output current of 30A.

[0023] The output system includes a power switch unit and a feeder access unit, which is used to output the current output by the power system to the DC load; the feeder access unit selects a secondary terminal block.

[0024] Advantages of this technical solution: After the successful development of this embodiment, the device was put into the emergency repair of charging module failure for field verification, and a total of 5 emergency repairs of charging module failures were completed. The device can provide stable output DC power. After the charging module fails, before replacing the new charging module, the device can work normally to provide power for the DC load, the longest time is 78 hours, and the average time is 73.6 hours, which effectively solves the problem of defective operation of the DC system due to damage to the charging module, and ensures the stable operation of the equipment.

[0025] (1) Safety benefits The mobile emergency DC power supply can quickly handle faults in the DC system charging module and reduce the time that the equipment runs with defects. The time from fault discovery to on-site processing is no more than 3 hours, which greatly shortens the fault handling time, improves the operating stability of the equipment, and ensures the safe and stable operation of the power grid.

[0026] (2) Economic benefits After adopting this device, the traditional charging module fault repair work mode has been changed. The faulty charging module can be returned to the factory for repair, which can save 1,800 yuan in repair costs each time. The company has about 11.2 DC system failures caused by charging modules each year, so the annual cost savings is 20,160 yuan.

[0027] (3) Prospective benefits The device has low cost, good safety and strong practicality. After mass production by the manufacturer, it can be widely promoted and used in the emergency repair of charging module failures, and has huge market potential in the future.

Claims

1. A substation emergency DC power supply vehicle, Its characteristics are: It comprises a power supply system, an output system and a box body, wherein the box body comprises a box body (1) and a plurality of brake universal wheels (2) fixed to the bottom of the box body; the power supply system and the output system are both arranged in the box body (1); The power supply system includes a charging module unit, a control protection unit and a data display unit; the charging module unit is used to convert AC power into DC power and store power; the control protection unit is used to stabilize voltage and control output current; the data display unit is used to display output current and output voltage; The output system includes a power switch unit and a feeder access unit, and is used to output the current output by the power system to a DC load.

2. The substation emergency DC power supply vehicle according to claim 1, Its characteristics are: The control and protection unit of the power supply system is one of DSP control, single chip microcomputer control and microcomputer control.

3. The substation emergency DC power supply vehicle according to claim 1, Its characteristics are: The data display unit of the power supply system is one of a DC digital voltmeter and a pointer voltmeter.

4. The substation emergency DC power supply vehicle according to claim 1, Its characteristics are: There are multiple charging modules, and the multiple charging modules are connected in parallel.

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