Software Design Of Voltage Disturbance System Based On LabVIEW

The power quality problem is an important issue involving the interests of power generation,power supply and power consumption.The ultimate goal of power quality problem is to control and control power quality.The premise of power quality control and governance is power quality problem.Accurate simulation and effective monitoring.The voltage disturbance system involved in this paper is a power quality problem simulation and monitoring system that simulates power quality problems such as voltage sag,sag,harmonics.In order to enrich the function of the system and improve the convenience of the system operation,it is urgent to develop a supporting software system for the system.For this purpose,this paper proposes to design a voltage disturbance system software based on LabVIEW.The software of voltage perturbation system proposed in this paper is one of the core components of the whole voltage perturbation system,which can realize online operation control,working condition monitoring,disturbance waveform simulation,data acquisition and off-line analysis of power quality parameters,etc.Using LabVIEW development platform with good man-machine interaction and strong signal analysis and processing,the user login module,measurement and control module and offline analysis module are designed and realized,which are three core software modules that can operate independently.Meanwhile,the operation flow and communication protocol of voltage disturbance system are designed.The login module program uses the method of dynamically calling the VI to reduce the program import time to reduce the memory usage,and combines the register with the queue to form a message queue to replace the large use of local variables and global variables to ensure good human-machine dialogue.The measurement and control module adopts the state machine mode as the basic framework of the overall program to achieve arbitrary switching operation interface.Among them,the data transmission function uses C/S mode to realize point-to-point TCP communication,which reduces the complexity of the program and ensures the reliability of network communication.The data collection function uses the producer/consumer model to implement multiple tasks in parallel,and transmits data through the queue to ensure data integrity and avoid data loss.The off-line analysis module adopts the method of reading data in stages to prevent the software from running slowly and the computer from getting stuck due to large files reading all the data at one time.The powerful data processing ability of LabVIEW is used to realize the function of waveform playback and power quality analysis,and to save the analysis results and generate reports.In addition,a fast file storage method is proposed to solve the problem of slow speed and poor real-time performance of LabVIEW traditional data acquisition file storage method.This method improves the traditional single consumer mode into double consumer mode,separates and synchronizes the file storage and other processing such as calculation and display in consumers,so that the file storage program can continuously perform data storage operations without waiting for the completion of other processors,thus speeding up the file storage speed.The test results show that the voltage disturbance system software designed in this paper can effectively realize the functions of online operation control,working state detection,disturbance waveform simulation,data acquisition and off-line analysis of power quality parameters of the voltage disturbance system.