Optimal topology intrinsically-safe direct-current power supply system

A DC power system, intrinsically safe technology, applied in the field of power generation, transmission and transformation, can solve the problem of DC power system busbar voltage loss, etc., to avoid performance degradation and ensure safe and uninterrupted power supply.

Pending Publication Date: 2020-03-31
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: based on the cause of the failure of the battery pack in the DC system of the power plant, which leads to the loss of voltage on the bus bar of the DC power

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optimal topology intrinsically-safe direct-current power supply system
  • Optimal topology intrinsically-safe direct-current power supply system
  • Optimal topology intrinsically-safe direct-current power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides an optimal topology intrinsically safe DC power supply system. All the storage batteries in the battery pack of the DC power supply system are divided into two groups, respectively, battery pack I and battery pack II; battery pack I and battery pack II are connected in parallel through a circuit, and the battery pack Group I and battery group II are powered by redundant power supply; redundant power supply includes three-phase AC power supply I and three-phase AC power supply II; the output terminal of battery group I circuit is divided into two branch circuits, and the two branch circuits are separated by isolated DC / The DC converter is boosted and connected to the control bus and the closing bus; the output of the battery pack II circuit is divided into two branch circuits, and the two branch circuits are respectively boosted by the isolated DC / DC converter and connected to the control bus and the closing bus. Preferably the isolated DC / DC con...

Embodiment 2

[0028] Based on an optimal topology intrinsically safe DC power supply system provided in Embodiment 1, the actual specific operation method is as follows:

[0029] Step 1. Analyze the phenomenon and cause of the failure of the DC power supply system

[0030] Before the accident, the operating status of the DC power supply system. The DC busbars are divided into I and II. The busbar section I carries 35 loads of No. 1 DC feeder cabinet, the load current is 11A, the No. 1 charging device is in floating charging mode, and the floating charging current is 0.5A; the busbar section II With No. 2 DC feeder cabinet 35 loads, load current 8A, No. 2 charging device float charging mode, float current 0.5A.

[0031]When a power grid accident occurs in the 110kV system, the voltage of the 0.4kV system for the station drops to 68% Un (Un is the rated voltage), causing the charging device of the DC power system to automatically protect and stop running (the AC input operating voltage of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an optimal topology intrinsically-safe direct-current power supply system. All storage batteries of a storage battery pack of the direct-current power supply system are dividedinto two groups, namely a battery pack I and a battery pack II; the battery pack I and the battery pack II are connected in parallel through a circuit and are powered by a redundant power supply; theredundant power supply comprises a three-phase alternating current power supply I and a three-phase alternating current power supply II; the output end of the battery pack I circuit is divided into two branch circuits, and the two branch circuits are respectively connected to the control bus and the closing bus after being boosted; and the output end of the battery pack II circuit is divided intotwo branch circuits, and the two branch circuits are respectively connected to the control bus and the closing bus after being boosted. For a direct-current bus voltage loss fault caused by a storagebattery pack fault, an intrinsically safe uninterrupted direct-current power supply scheme is provided through a method of reasonably grouping storage battery packs and accessing a boost conversion module, so that a guarantee is provided for safe and stable operation of a direct-current power supply system of a power plant station.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to an optimal topology intrinsically safe DC power supply system. Background technique [0002] The DC power supply system not only provides working power and control power for secondary equipment such as relay protection, monitoring systems and safety automatic devices in power plants, substations, and converter stations (hereinafter referred to as power plants) in normal times, but also Secure power supply in case of accidents and AC power outages. When the busbar of the DC power supply system loses (electricity) voltage, it will cause the secondary equipment to lose working power or control power, making it unable to work normally or perform related switching operations, directly threatening the safe operation of the power plant. With the increase of the installed capacity of the power plant, the expansion of the grid scale and the improvement of th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02J7/34H02J9/06
CPCH02J7/34H02J9/061
Inventor李晶罗洋陈文波
OwnerSTATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST