WO2021135767A1

WO2021135767A1 - Rapid load regulation method for multi-loop power supply distribution network

Info

Publication number: WO2021135767A1
Application number: PCT/CN2020/132305
Authority: WO
Inventors: 张杭; 赵新明; 任胜兰; 丁洁
Original assignee: 南京因泰莱电器股份有限公司
Priority date: 2019-12-31
Filing date: 2020-11-27
Publication date: 2021-07-08
Also published as: CN111064198A

Abstract

Disclosed is a rapid load regulation method for a multi-loop power supply distribution network, in which a regulation system composed of three parts, i.e. a system control unit, a load controller and a load collector, is used, and a rapid GOOSE protocol with AES encryption is used as a signal transmission scheme with regard to each part. A removal instruction regarding a line needing to be removed is sent to execution load controllers en masse by means of a GOOSE network. The rapid GOOSE communication network can ensure that after a faulty power source is removed and before a bus coupler is switched on (in order to introduce a load of the faulty power source to other lines), a spare power automatic switching device removes a specified line load, such that the residual power consumption load can be less than and approaches a rated power of the actual power supply to the maximum extent. The continuity of powering an important load can be ensured, and second tripping is prevented from occurring after the action of a spare power automatic switching device due to an excessively large load.

Description

Fast load control method for multi-loop power supply and distribution network

Technical field

The invention relates to the field of electric power technology, in particular to a fast load control method for a multi-loop power supply and distribution network.

Background technique

With the continuous improvement of people’s quality of life, people’s requirements for the continuity and reliability of power supply are getting higher and higher. Power supply reliability refers to the ability of the power supply system to continue supplying power. It is an important indicator for assessing the power quality of the power supply system and reflects the power supply. The degree to which industry meets the national economic power demand has become one of the standards for measuring the degree of economic development of a country.

In a backup power supply self-input power distribution network with multiple power supply circuits, if one or more of the power supply lines are out of power, the backup self-input system will cut off the faulty power supply line and introduce the load connected to the faulty power supply to other power supply lines At this time, if the total power load exceeds the total power of the power supply, the system will be overloaded and tripped, which will cause the entire power system to trip and fail to provide continuous power supply, resulting in a decrease in user satisfaction with electricity.

Summary of the invention

In order to solve the problems of the prior art, the present invention provides a fast load control method for a multi-loop power supply and distribution network, which can divide the power load according to the use level. The principle of “cutting, less super less cutting, no super non-cutting”, real-time calculation of the size of the load to be cut, and automatically cut off some of the lower-level loads, so as to ensure that the important loads in the system are uninterrupted and the user's power quality Not affected.

The invention adopts a control system composed of three parts: a system control unit, a load controller, and a load collector, and each part uses a fast GOOSE protocol with AES encryption as a signal transmission scheme.

The load collector is responsible for collecting the load power data of the measuring device at the end of the electricity consumption through the conventional 485 communication method, and transmitting it to the system control unit through the GOOSE protocol.

The system control unit divides each power load line into 11 levels according to the power supply capacity given by the power supply department in advance, which can be divided into 11 levels. The higher the level, the higher the importance. Then through the GOOSE network, real-time acquisition of the on-off status of the multi-channel incoming power supply, and the collected sudden change signal of the incoming power supply as the trigger signal of the software process.

After the incoming power supply failure collected by the system control unit, it will immediately be based on the rated power of the power failure line, the rated power of other incoming power supplies normally supplied, the classification of the power load, and the actual load data of the power load. According to the principle of “cutting, less super-less cutting, no super-no-cutting”, the load of the electric load line of the load that needs to be cut is calculated.

The beneficial effects of the present invention are:

1. Through the GOOSE network, send the cutting instructions of the lines that need to be cut off to the load controller. The fast GOOSE communication network can ensure that after the standby automatic switch is cut off the faulty power supply, before the bus joint brake (in order to import the load of the faulty power supply to the On other lines), cut off the specified line load, so that the remaining power load is less than and the maximum possible close to the actual rated power of the power supply. It can ensure the continuity of the power supply of important loads and avoid the secondary tripping after the automatic switch-on action caused by the excessive load.

2. In the multi-loop power supply distribution network system, when one or more power supply lines fail, the power supply continuity of important power loads can be guaranteed to the greatest extent. The example of the present invention can effectively solve the traditional backup For the secondary overload trip problem caused by the operation, the method of the present invention is not limited by the number of power supply circuits and the amount of power consumption, and can be flexibly configured in the actual power supply network topology.

Description of the drawings

Figure 1 is a diagram of a multi-power loop power supply network.

Figure 2 is a flow chart of the control strategy.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the entire power distribution system is powered by three power supply lines, and the bus bars on the load side of each section are connected to the three power supply lines. During normal operation, the three incoming lines are operated in single-bus sections. That is, all tie breakers 1K1, 1K2, 2K1, 2K2, 3K1, 3K2 are in the open state, and the rest of the circuit breakers are in the closed state.

When the first power supply loses power, after detecting the first power loss signal through fast GOOSE communication, the example of the present invention first disconnects the circuit breakers 1D1, 2D1, 3DL1, and according to the real-time power load collected last time before the power loss Perform calculation and analysis, cut off the appropriate lower-level electrical load according to the real-time electrical load, ensure that the remaining load is less than and as close as possible to the total rated power of the rest of the normal power supply, and then close the tie breaker 1K1, 2K1, 3K1, other circuit breakers do not operate. The entire action time uses fast GOOSE network communication, and the entire process is less than 0.5 seconds.

The example of the present invention is not limited to a power distribution system with 3 power supply circuits, and can be flexibly configured according to the actual power supply network map, and the corresponding control strategy can be formulated through the configuration file. Each control strategy corresponds to a state sequence. Sequence to execute the corresponding control strategy.

The example of the present invention adopts AES encryption GOOSE fast network communication, which can ensure the safety and speed of communication signal transmission. The total execution event of the control strategy is less than 0.5 seconds.

The control strategy process of the present invention is shown in Figure 2. The load collector is responsible for collecting the load power data of the measuring device at the end of the electricity consumption through the conventional 485 communication mode, and transmitting it to the system control unit through the GOOSE protocol.

After the incoming power supply failure collected by the system control unit, it will immediately be based on the rated power of the power failure line, the rated power of other incoming power supplies normally supplied, the classification of the power load, and the actual load data of the power load. Calculate the load of the electric load line of the load that needs to be removed based on the principle of “cutting, less super less cutting, no super no cutting”.

There are many specific applications of the present invention. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can be made. These Improvements should also be regarded as the protection scope of the present invention.

Claims

A fast load control method for a multi-loop power supply and distribution network, which is characterized by adopting a control system composed of three parts: a system control unit, a load controller, and a load collector, and each part uses a fast GOOSE protocol with AES encryption as a signal Transmission scheme

The load collector is responsible for collecting the load power data of the measuring device at the end of the electricity consumption through the conventional 485 communication method, and transmitting it to the system control unit through the GOOSE protocol;

The system control unit preliminarily divides each power load circuit into its importance level according to the power supply capacity given by the power supply department, and then collects the on-off status of multiple incoming power supplies in real time through the GOOSE network, and then collects the incoming power The sudden change signal of the switch state is used as the trigger signal of the software process;

After the incoming power supply failure collected by the system control unit, it will immediately be based on the rated power of the power failure line, the rated power of other incoming power supplies normally supplied, the classification of the power load, and the actual load data of the power load. Calculate the load of the electric load line of the load that needs to be removed based on the principle of “cutting, less super less cutting, no super no cutting”.
The rapid load control method for a multi-loop power supply and distribution network according to claim 1, characterized in that: each power load line is divided according to the importance level, which can be divided into 11 levels, and the higher the level, the higher the importance degree.