KR100771916B1 - Data aquisition method for digital protective relay - Google Patents

Abstract

A data acquiring method of a digital protective relay is provided to improve data acquiring efficiency by transmitting information to a monitoring system through one response using a register registered in a virtual register map. A data acquiring method of a digital protective relay includes the steps of: sorting out registers by receiving register information required by a monitoring system; sequentially registering and mapping the sorted registers on the continuous register of a virtual register map; and transmitting the information which is registered in the virtual register map to the monitoring system. The information stored in the virtual register map is the sorted register or a memory storage address of the sorted register.

Description

DATA AQUISITION METHOD FOR DIGITAL PROTECTIVE RELAY}

1 is a system diagram of a Modbus communication connection between a general monitoring board and a digital protective relay.

2 is a diagram illustrating a data acquisition process (a) and a register map (b) of a digital protective relay through conventional modbus communication.

3 is an exemplary diagram illustrating a data collection process of a digital protective relay through modbus communication according to the present invention.

Figure 4 is an exemplary view of storing the request register information of the monitoring panel according to the present invention in a local memory buffer.

5 is an exemplary diagram for a virtual register map generation process according to the present invention.

The present invention relates to a data collection method of a digital protective relay, and in particular, by providing a virtual register that can be set, optimizing the register map according to the data required to improve the data collection efficiency by Modbus communication A method of collecting data of a protective relay.

Modbus protocol is a kind of industrial standard communication protocol. It is used as a communication method between upper monitor and digital protection relay (hereinafter referred to as 'relay'), and register is a basic unit for expressing information in Modbus protocol.

The register map of the relay is a list of registers representing various types of information held by the relay, and is usually partitioned according to the characteristics of the information held by the relay, and the monitoring panel designates the address of the required data based on the register map. Obtain the necessary information from the relay.

1 shows a system configuration in which a monitoring panel and a relay are connected by modbus.

2 shows a process (a) and a register map (b) for communicating with a relay using a Modbus protocol in a conventional monitoring board.

Referring to Figures 1 and 2 will be described the data collection process by the Modbus communication between the conventional monitoring panel and the relay as follows.

The monitoring panel is a relay based on the relay register map shown in FIG. 2B, and includes a phase voltage R phase / S phase / T phase (1), current R phase / S phase / T phase (2), frequency (3), power factor and power amount. If (④) is requested, the relay responds.

In other words, in order to acquire necessary information (① ~ ④) from the relay in the monitoring panel, four request / response processes are performed between the monitoring panel and the relay as shown in FIG. 2A, which is acquired at once in the protocol of the Modbus protocol. This is due to the limited amount of data that can be done and the nature that the data must be at consecutive addresses on the relay register map.

The monitoring station reads the necessary electric quantity measurement values from the relay by communication with the relay using the Modbus protocol, and each of the electric quantity measurement values is mapped one-to-one to the register map of the relay in the Modbus protocol. That is, when the monitoring panel requests the 30001 register value of the register map to read the phase voltage R phase from the relay, the relay sends a value for the phase voltage R phase in response.

In the register map that the relay provides to the monitoring panel, as shown in FIG. 2B, all of the electricity amount of the relay is registered in the register. According to the monitoring panel, the register map is selected and used without using all of the electricity amounts registered in the relay register map. There is a case. For example, as shown in FIG. 2A, when the monitoring panel reads only phase voltages (R, S, T), currents (R, S, T), frequency, power factor, and power amount that are discontinuous from the relay to an address on the register map. Phase voltage reading (①), phase current reading (②), frequency reading (③), power factor and power amount reading (④) are performed to get all the information you need.

However, in the conventional method, the relay registers and manages all the information in the register map, so that in the Modbus communication system in which a plurality of relays are connected, a plurality of register informations having discontinuously arranged monitoring boards must be obtained. Due to the nature of the bus protocol, the number of request commands is required as much as the number of information required per relay, so the number of request / response increases as a register arranged discontinuously, requiring more transmission and reception in order to acquire all the information owned by one relay. As a result, the traffic of the entire system is increased to increase the occupancy time of the communication line.

Accordingly, the present invention was created to solve the above-mentioned conventional problems, and maps information discontinuously arranged in a register map of a relay to be acquired by a monitoring panel in modbus communication to a continuous register of a virtual register map. When receiving a signal for an information request from the monitoring panel, the desired information is transmitted to the monitoring panel using a register registered in the virtual register map in one response, thereby reducing the number of information requests and improving the data collection efficiency of the monitoring panel. Its purpose is to provide a data collection method for a protective relay.

According to an aspect of the present invention, there is provided a data collection method using modbus communication between a monitoring panel and a digital protective relay, the monitoring panel receiving register information desired from the monitoring panel and selecting a register; Registering and mapping the selected registers sequentially to successive registers of a virtual register map; And transmitting the information registered in the virtual register map to the monitoring panel.

The virtual register map may include a continuous virtual register address, a memory storage address of a register received from the monitoring panel, and a measurement value stored in the storage address.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

First, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, many specific details, such as specific processing flows, are set forth in the following description to provide a more general understanding of the invention, but are not limited thereto, and it is understood that the invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge in Esau.

According to the present invention, when acquiring information registered discontinuously in a register map of a digital protective relay connected through Modbus communication in a monitoring station, the controller stores the register information required by the monitoring group in a predetermined local memory buffer area in order and stores the stored information. The main idea is to reduce the number of requests for information by the monitoring team by sending it to the monitoring team in one response, and reduce the traffic of the system.

The information stored in the local memory buffer area is register information required by the monitoring station, and each register is connected to a memory storage address where the measured value is stored, so that the measured value can be known. It is constructed using memory storage addresses and measurement values associated with the stored register information, and the registers of the virtual register map are contiguous so that the supervisor can deliver the desired information through a single response to the request signal received from the supervisor.

3 is a flow chart illustrating an exemplary embodiment of a data collection process of a digital protective relay according to the present invention. As shown in the drawing, a register corresponding to the information in a relay register map is received by receiving register information requiring registration from a monitoring board. And selecting the selected registers, storing the selected registers in a predetermined local memory buffer in order, and delivering measurement values of the registers stored in the local memory buffer in order to the monitoring panel.

The selected registers sequentially stored in the local memory buffer may be connected to a memory storage address of the corresponding register to determine a measured value. The virtual register map may include information stored in the local memory buffer and a storage address connected to the selected register. Configured using the measured value. At this time, the registers of the virtual register map are contiguous, and the register information requested by the monitoring panel is sequentially stored in the consecutive registers, or the memory storage addresses of the requested registers are sequentially stored. The reason why the virtual register map is necessary is that the modbus communication between the supervisor and the digital protective relay is a register, and the measured values of the discontinuous registers or registers required by the supervisor must be stored in order.

Since the registers constituting the virtual register map have a contiguous address, information about a register selected from the register map of the relay registered in the virtual register map is stored in the contiguous address of the virtual register map.

The operation of the present invention will be described with reference to FIGS. 4 and 5 as follows.

First, when the register information of the relay required by the monitoring station is requested through the Modbus communication, the predetermined local memory buffer area Buffer [0] to the register information received from the sensing panel in the relay as shown in FIG. Buffer [9]) sequentially.

That is, upon receiving the register information of the relay required from the monitoring panel, the received register information is sequentially selected from the register map of the relay in which the register of the relay is stored.

The selected register information is sequentially stored in the predetermined local memory buffer area. At this time, the local memory buffer area has a contiguous address, and the value stored in each buffer area may be each register of the relay register map required by the monitoring station or a memory storage address for the register.

The virtual register map is configured using the local memory buffer area and the register information (including the memory storage address and the measured value) required by the monitoring panel stored in the buffer area, and the information stored at the consecutive addresses of the virtual register map. To the monitoring station.

Referring to Fig. 5 again, as shown in Fig. 5A, the registers selected in the register map of the relay are sequentially stored in a local memory buffer for registering the registers required by the monitoring station.

The registers stored in order in the local memory buffer are information required by the monitoring panel, as shown in FIG. The measured value of each register may be known through a memory storage address where values for reactive power are stored (b).

A virtual register map as shown in FIG. 5C is constructed by using register information stored in the local memory buffer, measured values of each storage address of the register, and each register stored in the storage address, as shown in FIG. 5C. As you can see, the virtual register map has a series of registers.

When the virtual register map is configured, the information stored in the virtual register map is transferred to the monitoring panel through Modbus communication, so that the monitoring panel can acquire all the information of the desired relay through a single request. That is, the monitoring station reads consecutive registers 35001 to 35010 of the virtual register map to obtain desired relay information.

As described above, the present invention can obtain all the information of the desired relay from the monitoring panel through one request from the monitoring panel to the relay, thereby reducing the number of requests / responses with the relay in one step, thereby reducing the system's Modbus communication traffic. In other words, the monitoring panel has the advantage of improving the data collection efficiency of the relay.

As described in detail above, the present invention maps information discontinuously arranged in a register map of a relay to be acquired by a supervisor in modbus communication to a continuous register of a virtual register map, and receives a signal for an information request from the supervisor. By using the register registered in the virtual register map at the time, the desired information is transmitted to the monitoring panel in one response, thereby reducing the number of information requests and improving the data collection efficiency of the monitoring panel.

Claims (5)

In the data collection method by the Modbus communication of the monitoring panel and the digital protection relay, Receiving, by the monitoring panel, desired register information from the monitoring panel and selecting a register; Registering and mapping the selected registers sequentially to successive registers of a virtual register map; And transmitting the information registered in the virtual register map to the monitoring panel. The method of claim 1, wherein the information stored in the virtual register map is the selected register or a memory storage address of the selected register. The method of claim 1, wherein the information stored in the virtual register map is the selected register or a measured value of the selected register. The virtual register map of claim 1, further comprising: a contiguous virtual register address; A memory storage address of a desired register in the monitor panel; And a measurement value stored at the storage address. 5. The method of claim 4, wherein the desired registers in the monitoring panel are stored in order in a local memory buffer area having consecutive storage addresses.

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