CN106099727A - A kind of construction method of secondary equipment of intelligent converting station system - Google Patents

Abstract

The invention discloses a method for constructing a secondary equipment system of an intelligent substation, comprising the following steps: A) dividing the data of the intelligent substation into protection data and measurement data, which are separately sampled and have a unique data source; B) establishing a line interval ; C) Establish the main transformer interval; D) Establish the bus interval. The construction method of the secondary equipment system of the intelligent substation of the present invention can reduce the realization links of protection and measurement and control functions, improve the quickness and reliability of the device, and propose that the secondary equipment separated by the line and the bus adopts the functional integration equipment of the interval layer and the process layer And installed on site, the secondary equipment between the busbar and the main transformer still adopts a layered structure, and the process layer interface adopts GOOSE and SV common ports; in order to facilitate operation and maintenance, the data of the whole station is divided into protection data and measurement data , which are independently sampled and have a unique data source, are reliable, economical, and efficient, and have good application prospects.

Description

A method for constructing a secondary equipment system of an intelligent substation

technical field

The invention relates to the technical field, in particular to a method for constructing a system architecture of a secondary equipment of an intelligent substation based on a multifunctional integrated device.

Background technique

Smart substations have become the main mode of domestic substation construction. Smart substations adopt a "three-layer and two-network" structure, namely station control layer equipment, bay layer equipment, process layer equipment, station control layer network and process layer network. Compared with conventional substations, smart substations add process-level networks and equipment to realize the sharing of sampling values and switching value information and network tripping. The communication medium of the process layer network adopts optical fiber, and the secondary cable circuit of the traditional substation is replaced by a virtual loop connection. ) and configuration files (ICD), etc.

Process-level equipment such as intelligent terminals and merging units have realized on-site digital collection and networked control. However, the number of devices in the intelligent station is significantly higher than that of the conventional station, the network structure is complex, the overall investment cost is relatively large, and the operation and maintenance cost is relatively high. In December 2012, the construction of a new generation of smart substation demonstration project with the goal of "small land occupation, low investment and high efficiency" was launched. The substation process layer, interval layer and station control layer equipment began to explore the functional integration design. The more typical ones are Intelligent terminal, merging unit integration device, measurement and control protection integration device, centralized protection device, centralized measurement and control device, multi-functional measurement and control device, integrated monitoring system, etc. The integrated design of each device reduces the number of devices and simplifies the network architecture to a certain extent, but there are still the following problems,

(1) The reliability and rapidity of action of the protection device are reduced, and the protection function is realized by the cooperation of the protection device, the merging unit, and the intelligent terminal, and the realization link of the protection function is added. In the "direct mining and direct jumping" mode, the intelligent station protection action The time is about 5ms slower than that of conventional stations. In addition, any failure of any link among the merging unit, the protection device and the intelligent terminal will result in the loss of the protection function. However, due to the large number of optical ports and the large amount of heat generated by the merging unit and intelligent terminal operating on site, they are affected by the ambient temperature and electromagnetic interference on site, and have a high failure probability, which affects the overall reliability of protection. The problem is even more serious for cross-interval protection equipment.

(2) Process layer equipment realizes multi-service information sharing, but at the same time, it also affects the operation, maintenance and expansion of various business systems. Taking the line merging unit as an example, a line merging unit needs to provide sampling value data for multiple devices on the line protection device, busbar protection device, safety and stability device, short lead protection, and SV network. For example, when the measurement and control needs maintenance, it will affect the operation of other businesses.

(3) The virtual terminal configuration workload is heavy and difficult to maintain. Both the smart terminal and the merging unit need to be configured with virtual terminals, which is an important part of the design and commissioning of smart substations. Moreover, the virtual terminal is invisible and intangible during the operation and maintenance phase, so it brings certain difficulties to the operation and maintenance.

(4) The data synchronization is complex. The merging unit, switch, protection measurement and control equipment of the smart substation must operate based on a unified time reference in order to meet the time consistency requirements of the sequence of events record (SOE) and fault recording. The merging unit And intelligent terminals need to achieve μs synchronization accuracy due to the transmission of sampling values and trip information, which requires high stability of the internal clock of the merging unit and the timing accuracy when the external clock source is missing or jittering.

In order to solve and optimize the above-mentioned problems, it is an urgent problem to be solved at present.

Contents of the invention

The purpose of the present invention is to overcome the problems existing in the existing secondary equipment system architecture of the intelligent substation. The system architecture of the intelligent substation secondary equipment based on the multifunctional integrated device of the present invention greatly reduces the number of substation devices, the number of switch ports and the number of pigtails, further simplifies the network architecture, greatly reduces the direct cost, and the workload of configuring virtual terminals and SCDs It is greatly reduced, the engineering debugging cycle is shortened, and the difficulty of operation and maintenance is reduced. It is reliable, economical and efficient.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A method for constructing a secondary equipment system of an intelligent substation, characterized in that: comprising the following steps,

Step (A), the data of the smart substation is divided into protection data and measurement data, which are sampled independently and have a unique data source. Device use; measurement data is collected by a multi-functional measurement and control device for use by measurement and control devices, dynamic vector measurement units, and metering devices;

Step (B), establish the line interval, collect the protection voltage and current signals with the multi-functional protection device with protection function, protection-related merging unit function, and protection-related intelligent terminal function, and communicate with the exit trip circuit through the cable For connection, configure the multi-function protection device with dual MMS optical fiber interfaces, and access to the MMS dual network of the station control layer. The process layer interface adopts GOOSE and SV common ports, and is connected to the bus differential protection point-to-point, and connected to the dual network of the process layer; The multifunctional measurement and control device with the measurement and control function, the function of the merging unit related to the measurement and control, and the function of the intelligent terminal related to the measurement and control collects the measured voltage and current signals, and connects them to the exit trip circuit through the cable, and configures the multifunctional measurement and control device. The MMS optical fiber interface is connected to the MMS dual network of the station control layer, and the process layer interface adopts GOOSE and SV common port mode, and is connected to the dual network of the process layer;

Step (C), establish the main transformer interval, including the main transformer protection device, the integrated device of the high-voltage side intelligent terminal merging unit, the medium-voltage side intelligent terminal merging unit integrated device, the low-voltage side intelligent terminal merging unit integrated device, and the main body intelligent terminal device, a multi-function measurement and control device on the high-voltage side, a multi-function measurement and control device on the medium-voltage side, a multi-function measurement and control device on the low-voltage side, and a multi-function measurement and control device on the main body. The main transformer protection device integrates the main protection and backup protection functions. , the integrated device of the intelligent terminal merging unit on the low-voltage side, and the point-to-point communication of the main body intelligent terminal device to sample and trip the outlet, and adopt the SV and GOOSE common port mode, double-set configuration, the high-voltage, medium-voltage, low-voltage, and this side The multi-function measurement and control device integrates the functions of measurement and control device, intelligent terminal, and merging unit, and is configured in a single set. Each multi-function measurement and control device directly measures current and voltage, trips directly through the relay outlet, and provides SV and GOOSE common ports to share data;

Step (D), establish the busbar interval, including the busbar protection device, the busbar measurement and control device, and the busbar merging unit. Collect the position of PT knife switch and the measured value of bus voltage, and transmit the telemetry information through the MMS network; the signal of sampled value and position are obtained by point-to-point GOOSE and SV common port communication between the bus protection device and the multi-function protection device in the line interval signal, execute jump order; the integrated device of the intelligent terminal merging unit in the interval between the bus protection device and the main transformer obtains the sampling value signal and the position signal through point-to-point GOOSE, SV common port communication mode, and executes the jump order; the bus merges The unit is used to provide bus voltage sampling value information.

The beneficial effects of the present invention are: the construction method of the intelligent substation secondary equipment system of the present invention has the characteristics of reliability, economy and high efficiency, and the specific performance is as follows:

(1) In order to reduce the realization links of protection and measurement and control functions, and improve the quickness and reliability of the device, it is proposed that the secondary equipment separated by the line and the busbar adopts the functional integration equipment of the interval layer and the process layer and is installed on site, and the interval between the busbar and the main transformer The secondary equipment still adopts a layered structure, and the process layer interface adopts the GOOSE and SV common interface mode;

(2) In order to facilitate operation and maintenance, the data of the whole station is divided into protection data and measurement data, which are independently sampled and have a unique data source. For stability devices, the measurement data is sampled by the on-site measurement and control device at line intervals, and is used by the dynamic vector measurement unit (PMU) and metering device.

Description of drawings

Fig. 1 is a flow chart of the construction method of the secondary equipment system of the intelligent substation of the present invention.

Fig. 2 is a system block diagram of the line spacing established by the present invention.

Figure 3 is a system block diagram of the main transformer bay established by the present invention.

Fig. 4 is a system block diagram of the bus bay established by the present invention.

Fig. 5 is a schematic diagram of the system architecture of a 220kV dual-bus main wiring intelligent substation according to an embodiment of the present invention.

detailed description

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

As shown in Figure 1, the construction method of the intelligent substation secondary equipment system of the present invention includes the following steps,

Step (A), the data of the smart substation is divided into protection data and measurement data, which are sampled independently and have a unique data source. Device use; measurement data is collected by a multi-functional measurement and control device for use by measurement and control devices, dynamic vector measurement units, and metering devices;

Step (B), establish the line interval, as shown in Figure 2, collect the protection voltage and current signals, and pass The cable is connected to the exit trip, and the multi-function protection device is equipped with dual MMS optical fiber interfaces, which are connected to the MMS dual network of the station control layer. Process layer dual network; the multifunctional measurement and control device with measurement and control function, measurement and control-related merging unit function, and measurement and control The measurement and control device is equipped with dual MMS optical fiber interfaces, which are connected to the MMS dual network of the station control layer, and the process layer interface adopts the GOOSE and SV common port mode, and is connected to the dual network of the process layer;

Step (C), establish the main transformer interval, as shown in Figure 3, including the main transformer protection device, the integrated device of the high-voltage side intelligent terminal combining unit, the integrated device of the medium-voltage side intelligent terminal combining unit, and the integrated device of the low-voltage side intelligent terminal combining unit The main transformer protection device integrates the main protection and backup protection functions, Through the point-to-point communication with the intelligent terminal merging unit integrated device on the high voltage, medium voltage and low voltage sides, and the intelligent terminal device on the body, sampling and tripping are carried out, and the SV and GOOSE common port mode is adopted, dual configuration, the high voltage, medium voltage , low-voltage, and multi-functional measurement and control devices on this side integrate the functions of measurement and control devices, intelligent terminals, and amalgamation units, and are configured in a single set. port to share data;

Step (D), establish the busbar interval, as shown in Figure 4, including the busbar protection device, busbar measurement and control device, and busbar merging unit, and connect the busbar voltage to the busbar protection device, busbar measurement and control device, and busbar merging unit with cables after passing through the parallel box , the busbar measurement and control device collects the position of the PT knife switch and the measured value of the busbar voltage, and transmits the telemetry information through the MMS network; the communication mode of point-to-point GOOSE and SV common ports is used between the busbar protection device and the multifunctional protection device in the line interval Obtain the sampled value signal and position signal, and execute the jump command; the integrated device of the intelligent terminal merging unit in the interval between the bus protection device and the main transformer obtains the sampled value signal and the position signal by means of point-to-point GOOSE and SV common port communication, and executes the jump order. order; the bus merging unit is used to provide bus voltage sampling value information.

Next, according to the construction method of the intelligent substation secondary equipment system of the present invention, an implementation will be introduced in detail. Taking a 220kV double-bus main wiring intelligent substation as an example, the system architecture diagram is shown in Figure 5, assuming that there are four 220kV outlets in the substation (The more outlets, the more obvious the advantages), 2 main transformers, 1 bus coupler. According to the construction method of the present invention and the configuration of the secondary equipment required for the above interval of the current smart substation scheme, the following table shows,

In a 220kV intelligent substation, at least 20 sets of devices can be saved by adopting the line interval of the present invention, and 12 sets of devices can be saved by the main transformer interval. At the same time, it can save 84 switch network ports and 108 optical fibers. More importantly, the functions of the devices in the interval are independent, there is no mutual correlation, and there is no merging unit sampling transmission and intelligent terminal response link, which greatly improves the speed and reliability of the protection device in the interval. The cross-interval device is used for direct mining and jumping, and at the same time, the heat generation of the bus differential protection is reduced to the same level as the line protection device, which further improves the reliability of the protection function and the stability of the system.

In summary,

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. A construction method of an intelligent substation secondary equipment system, characterized in that: comprising the following steps, Step (A), the data of the smart substation is divided into protection data and measurement data, which are sampled independently and have a unique data source. Wave device and safety and stability device; measurement data is collected by multi-functional measurement and control device, and SV and GOOSE interfaces are provided for measurement and control device, dynamic vector measurement unit, and metering device; Step (B), establish the line interval, adopt a multi-functional protection device with protection function, protection-related merging unit function, and protection-related intelligent terminal function, collect protection voltage and current signals, and communicate with the exit trip circuit through cables To connect, configure the multi-function protection device with dual MMS optical fiber interfaces, access to the MMS dual network of the station control layer, the process layer interface adopts GOOSE, SV common interface mode, point-to-point connection to the bus differential protection, and access to the dual network of the process layer; A multi-functional measurement and control device with measurement and control functions, a combination unit function related to measurement and control, and an intelligent terminal function related to measurement and control, collects and measures voltage and current signals, and connects them to the exit trip circuit through cables, and configures the multi-function measurement and control device with dual MMS The optical fiber interface is connected to the MMS dual network of the station control layer, and the process layer interface adopts GOOSE and SV common port mode, and is connected to the dual network of the process layer; Step (C), establish the main transformer interval, including the main transformer protection device, the integrated device of the high-voltage side intelligent terminal merging unit, the medium-voltage side intelligent terminal merging unit integrated device, the low-voltage side intelligent terminal merging unit integrated device, and the main body intelligent terminal device, a multi-function measurement and control device on the high-voltage side, a multi-function measurement and control device on the medium-voltage side, a multi-function measurement and control device on the low-voltage side, and a multi-function measurement and control device on the main body. The main transformer protection device integrates the main protection and backup protection functions. , the integrated device of the intelligent terminal merging unit on the low-voltage side, and the point-to-point communication of the main body intelligent terminal device to sample and trip the outlet, and adopt the SV and GOOSE common port mode, double-set configuration, the high-voltage, medium-voltage, low-voltage, and this side The multi-function measurement and control device integrates the functions of measurement and control device, intelligent terminal, and merging unit, and is configured in a single set. Each multi-function measurement and control device directly measures current and voltage, trips directly through the relay outlet, and provides SV and GOOSE common ports to share data; Step (D), establish the busbar interval, including the busbar protection device, the busbar measurement and control device, and the busbar merging unit. Collect the position of PT knife switch and the measured value of bus voltage, and transmit the telemetry information through the MMS network; the signal of sampled value and position are obtained by point-to-point GOOSE and SV common port communication between the bus protection device and the multi-function protection device in the line interval signal, execute jump order; the integrated device of the intelligent terminal merging unit in the interval between the bus protection device and the main transformer obtains the sampling value signal and the position signal through point-to-point GOOSE, SV common port communication mode, and executes the jump order; the bus merges The unit is used to provide bus voltage sampling value information.