CN207007956U - Wind power plant power quality data acquisition system - Google Patents

Abstract

The utility model discloses an electric energy quality data acquisition system of a wind farm, which solves the problem that the data acquisition is easily distorted for a long time without being discovered during the electric energy quality test process. A current transformer (2) and a voltage transformer (3) are respectively arranged on the grid busbar (1), and the current transformer (2) passes through the current test line (4) and the current input terminal of the power quality tester (5) Connected together, the voltage transformer (3) is connected together with the voltage input terminal of the power quality tester (5) through the voltage test line (6), and the power quality tester (5) is connected together with the DC power supply (7) A two-way wireless communication unit (8) is connected to the power quality tester (5), and another two-way wireless communication unit (10) is connected to the host computer (9) in the central control room. Improve the data collection quality of the power quality test, and avoid the failure of collecting data for a long time.

Description

Wind Farm Power Quality Data Acquisition System

technical field

The invention relates to a wind farm power quality data collection system, in particular to a wind farm power quality data collection system and a real-time comparison method.

Background technique

When testing the power quality of a wind farm, the portable power quality tester is first connected to the measurement and control panel cabinet in the main control room of the wind farm, and the power quality data is collected from the corresponding measuring points of the wind farm. During the data collection process, it is necessary Continuously collect data for more than 24 hours at the measuring point; after the data collection is completed, remove the power quality tester, and then process and analyze the collected data to determine whether the power quality of the wind farm meets the relevant standards. When connecting the power quality tester to the measurement and control panel cabinet of the main control room of the wind farm, the following situations often occur: (1) Since there is no display screen on the power quality tester, the phenomenon of wrong connection of the corresponding measurement points often occurs , When the data collection is completed and enters the later analysis, the data abnormality is discovered, which leads to invalid data collected for a long time and greatly reduces the efficiency of data collection. (2) In the process of power quality testing, sometimes the current clamp and voltage terminal of the power quality tester are loose, which will also lead to data collection distortion. (3) Due to the long time of data collection, the complex environment of the collection site, and frequent other operations in the main control room, sometimes data collection interruptions caused by human factors may occur, and the power quality tester cannot display and warn, resulting in long-term Time data acquisition is not available. (4) Before data collection, according to the test requirements, the test parameters in the power quality tester should be set in advance. The existing technology is to use a PC to connect with the power quality tester through a data line to complete Pre-set parameters, due to the small space and complex environment of the test site, there is a defect that the site parameter setting is inconvenient; in addition, during the test process, the real-time data of the power quality test and the existing monitoring of the main control panel of the wind farm have not been realized. The cross-comparison of data wastes existing resources.

Contents of the invention

The invention provides a wind farm electric energy quality data collection system and a real-time comparison method, which solves the technical problem that the data collection is easily distorted for a long time without being discovered during the electric energy quality test process.

The present invention solves the above technical problems through the following technical solutions:

A power quality data acquisition system for a wind farm, including a power grid bus and a central control room host computer. A current transformer and a voltage transformer are respectively arranged on the power grid bus. Connected together, the voltage transformer is connected with the voltage input terminal of the power quality tester through the voltage test line, the power quality tester is connected with the DC power supply, and a two-way wireless communication unit is connected to the power quality tester. Another two-way wireless communication unit is connected to the host computer in the central control room.

The upper computer in the central control room is provided with the voltage level setting value of the power quality test, the voltage and current transformer transformation ratio setting value and the test parameter setting value.

A real-time comparison method for wind farm power quality data acquisition, characterized in that it comprises the following steps:

The first step is to connect the on-site power quality tester with the upper electromechanical unit in the central control room through a two-way wireless communication unit and another two-way wireless communication unit;

The second step is to select the voltage level setting value, the voltage and current transformer ratio setting value and the test parameter setting value on the host computer in the central control room, and set the voltage level setting value, voltage and current mutual inductance through the two-way wireless communication unit and another two-way wireless communication unit. Transformer ratio setting value and test parameter setting value are transmitted to the power quality tester for parameter setting;

The third step is to collect the test data of the current, voltage and power values on the grid bus in real time through the power quality tester;

The fourth step is to transmit the test data to the upper computer in the central control room through the two-way wireless communication unit and another two-way wireless communication unit for real-time display;

The fifth step is to select the real-time current, voltage and power values of the pre-test bus on the main control screen of the wind farm, and compare the selected real-time current, voltage and power values with the real-time current collected by the power quality tester in the third step , voltage and power values are compared separately; if the comparison is the same, the voltage level setting value, voltage and current transformer ratio setting value and test parameter setting value are correct, the power quality tester is connected correctly, and there is no virtual connection or disconnection. If the connection phenomenon is not detected, proceed to the seventh step; if the comparison values are different, proceed to the sixth step;

Step 6. Check whether the voltage level setting value, voltage and current transformer ratio setting value and test parameter setting value on the host computer in the central control room are correct. If not, repeat steps 2 to 5. If correct, check Whether the wiring of the power quality tester is wrong, or there is a phenomenon of false connection or disconnection, reconnect the power quality tester, and after correction, repeat steps 3 to 5;

The seventh step is to start power quality data collection.

The present invention realizes the real-time data transmission between the power quality tester and the upper computer by configuring a two-way wireless communication unit, and solves the problem of limited distance and movement of the wired transmission mode during on-site testing; by adopting a real-time comparison method, it can The consistency of the test data and the actual data is compared in real time through the wireless connection to ensure the accuracy of the wiring and parameter settings of the power quality tester, which improves the test efficiency and ensures the authenticity of the test data. At the same time, it improves the power quality test data. Acquisition quality avoids the failure of collecting data for a long time, and improves the efficiency of power quality assessment of wind farms.

Description of drawings

Fig. 1 is a schematic structural diagram of a wind farm power quality data acquisition system of the present invention;

Fig. 2 is a flow chart of the real-time comparison method for wind farm power quality data according to the present invention.

detailed description

The present invention is described in detail below according to accompanying drawing:

A wind farm power quality data acquisition system, including a grid bus 1 and a central control room host computer 9, a current transformer 2 and a voltage transformer 3 are respectively arranged on the grid bus 1, and the current transformer 2 communicates with the electric energy through the current test line 4 The current input terminals of the quality tester 5 are connected together, the voltage transformer 3 is connected together with the voltage input terminals of the power quality tester 5 through the voltage test line 6, and the power quality tester 5 is connected together with the DC power supply 7. A two-way wireless communication unit 8 is connected to the power quality tester 5, and another two-way wireless communication unit 10 is connected to the host computer 9 in the central control room.

The upper computer 9 in the central control room is provided with the voltage level setting value of the power quality test, the voltage and current transformer transformation ratio setting value and the test parameter setting value. The voltage level setting value, voltage and current transformer transformation ratio setting value and test parameter setting value in the power quality tester are the voltage in the central control room host computer 9 transmitted by another two-way wireless communication unit 10 through the two-way wireless communication unit 8 Level setting value, voltage and current transformer transformation ratio setting value and test parameter setting value are obtained.

A real-time comparison method for wind farm power quality data acquisition, comprising the following steps:

The first step, through the two-way wireless communication unit 8 and another two-way wireless communication unit 10, the power quality tester 5 of the on-site test is electrically connected with the upper computer 9 in the central control room;

The second step, select the voltage level setting value, the voltage and current transformer transformation ratio setting value and the test parameter setting value on the upper computer 9 in the central control room, and set the voltage level setting value through the two-way wireless communication unit 8 and another two-way wireless communication unit 10 , The voltage and current transformer transformation ratio setting value and the test parameter setting value are transmitted to the power quality tester 5 for parameter setting;

The third step is to collect the test data of the current, voltage and power value on the grid bus 1 in real time through the power quality tester 5;

The fourth step, and transmit the test data to the host computer 9 in the central control room through the two-way wireless communication unit 8 and another two-way wireless communication unit 10 for real-time display;

The fifth step is to select the real-time current, voltage and power values of the pre-test bus on the main control screen of the wind farm, and compare the selected real-time current, voltage and power values with the real-time current collected by the power quality tester in the third step , voltage and power values are compared separately; if the comparison is the same, the voltage level setting value, the voltage and current transformer ratio setting value and the test parameter setting value are correct, the power quality tester 5 is connected correctly, and there is no virtual connection, Disconnection phenomenon, go to the seventh step, if the comparison value is different, go to the sixth step;

Step 6. Check whether the voltage level setting value, voltage and current transformer transformation ratio setting value and test parameter setting value on the upper computer 9 in the central control room are correct. If not, repeat steps 2 to 5. If correct, Then check whether the wiring of the power quality tester 5 is wrong, or there is a phenomenon of virtual connection or disconnection, and reconnect the power quality tester 5. After correction, repeat steps 3 to 5;

The seventh step is to start power quality data collection.

Claims (2)

1. A wind farm power quality data acquisition system, including a grid bus (1) and a central control room host computer (9), and a current transformer (2) and a voltage transformer (3) are respectively installed on the grid bus (1) , the current transformer (2) is connected to the current input terminal of the power quality tester (5) through the current test line (4), and the voltage transformer (3) is connected to the power quality tester (5) through the voltage test line (6) ), the voltage input terminals of the power quality tester (5) and the DC power supply (7) are connected together, and it is characterized in that a two-way wireless communication unit (8) is connected to the power quality tester (5), Another two-way wireless communication unit (10) is connected to the upper computer (9) in the central control room. 2. A wind farm power quality data acquisition system according to claim 1, characterized in that the upper computer (9) in the central control room is provided with the voltage level setting value of the power quality test and the voltage and current transformer transformation ratio setting value and test parameter setting value.