What is the definition of an intelligent substation, and the basic structure of the intelligent subs

Intelligent substation is the use of advanced, reliable, integrated and environmentally friendly intelligent equipment, with the whole station information digitization, communication platform networking, information sharing standardization as the basic requirements, automatically complete information collection, measurement, control, protection, measurement and detection and other basic functions, at the same time, with support for real-time automatic control of the power grid, intelligent adjustment, analysis and decision-making and collaborative interaction and other advanced functions of the substation.

The definition of intelligent substation, the definition of intelligent substation, is to integrate the operation of substation into science through modern intelligent technology, and then realize artificial intelligence.

What is the definition of a substation? The definition of a smart substation means that the smart local electricity can be converted at will.

I think the definition of that smart substation is to help people better realize the use of electricity and make household electricity safer.

The meaning of energy substation is that everything is not manually operated, but is controlled by computers.

This kind of change electronic scale, then its greatest significance is that we are not in a range at all, if you change it, its same mobile phone this situation, if you want to change it is also very good.

We only need to follow the specific definition, and then complete the debugging, and then we can carry out the de-system coordination function.

Intelligent substationThe intelligent substation system is divided into 3 layers, as follows:

1. The process layer includes intelligent equipment, merging units and intelligent terminals composed of primary equipment and intelligent components, which completes the power distribution, conversion, transmission and measurement, control, protection and metering of substation

2. Spacer equipment generally refers to secondary equipment such as relay protection device, measurement and control device, fault recording, etc., to realize the function of using an interval of data and acting on the interval primary equipment, that is, communicating with various remote input and output, intelligent sensors and controllers.

3. The control layer includes automation system, station domain control system, communication system, timing system and other subsystems, which realize the measurement and control functions for the whole station equipment, and complete the data acquisition and monitoring control (SCA-DA), operation locking, synchrophasor acquisition, electrical energy collection, protection information management and other related functions.

Belonging to the application category of intelligent substation is, the details are as follows:

Smart substations have similarities and differences with conventional substations. First of all, both have the same function, they are both power facilities in the power system that transform voltage, receive and distribute electric energy, control the flow of electricity and adjust voltage, and it connects the power grid of various levels of voltage through its transformer.

At the same time, there are obvious differences between smart substations and conventional substations. In the era of intelligent substations, the cables between the primary equipment and the protection and measurement and control in the conventional substation are ignited by optical cables; The DC signal (positive voltage, negative voltage, ground voltage) and AC signal (CT, PT, secondary current, voltage) transmitted in the cable are replaced by the messages transmitted in the network; The relay hardware circuits used to implement the protection logic in the past have been replaced by software programs in the microcomputer protection devices.

Below, we will introduce the differences between intelligent substations and conventional substations from three aspects: primary equipment intelligence, secondary equipment networking, and equipment maintenance status.

Intelligent terminal: It is connected with the primary equipment by cable, and by optical fiber with the secondary equipment such as protection and measurement and control, so as to realize the measurement and control functions of the primary equipment. The meaning of GOOSE is "object-oriented general substation event", and the GOOSE letter leather shirt scattering mainly includes the switch switch position, control switch position, abnormal alarm signal, blocking signal, etc.

The GOOSE link is quite a collapse of the DC control and signal cables in the traditional station, which transmit control commands and signals.

Merging unit: For a physical unit that combines the current or voltage data of the secondary converter in a time-correlated manner, the voltage and current values can be read directly from the SV message sent by the merging unit for devices (protection, measurement and control) that require the use of voltage and current. SV is the "sampling value", which includes the current and voltage values on the secondary side of the transformer.

The SV link is comparable to the secondary AC cable in a conventional station.

The main characteristics of the digital substation are the application of electronic transformers, intelligent primary equipment, network secondary equipment, and IEC 61850.

In addition to the technical level, the intelligent substation focuses more on operation and management, in addition to the above technical characteristics. It is also necessary to consider the content of sequence control, collaborative interaction, condition monitoring, etc., but there are no rigid requirements for electronic transformers, and they can be flexibly configured according to substations of different voltage levels, etc.

Search: What is the difference between a smart substation and a digital substation? What is the principle and basic configuration of a digital substation?

It is generally divided into the following four specific situations:

1) The intelligent terminal has the function of switching and analog acquisition, and the input points can be flexibly configured according to the needs of the project; The switching input should be collected by strong current; The analogue input should be able to receive 4 20mA current and o 5V.

2) The intelligent terminal has the function of switching output, the number of output points can be flexibly configured according to the needs of the project, and the output contact capacity of the relay should meet the actual needs of the site.

3) The intelligent terminal has the function of circuit breaker control, and different modes such as split-phase control or three-phase control can be selected according to the needs of the project. In addition, Xiangtai Electric prompts at least two components of phase trip contacts and a combination of gate contacts, and the jump and close commands need to be reliably verified.

4) The intelligent terminal should have the ability to receive protection tripping commands, hand-closed circuit breaker commands for measurement and control, and goose commands such as isolation switches and grounding switches, input circuit breaker positions, isolation switches and grounding switch positions, circuit breaker body signals (including low pressure locking reclosing, etc.), with tripping and closing self-holding functions, and control loop disconnection monitoring, tripping pressure monitoring 30 vision and locking functions.