CN202870219U - Intelligent power quality monitoring system - Google Patents

Abstract

The utility model belongs to the field of intelligent monitoring equipment and particularly relates to an intelligent power quality monitoring system, which comprises a data acquisition module, a synchronous sampling A/D conversion module, a data processing module, a storage module, an alarm module, an integrated communication module and a man-machine interface module. The data acquisition module, the A/D conversion module, the data processing module and the integrated communication module are successively connected with each other. The data processing module is also connected with the storage module and the alarm module. The data acquisition module is used for acquiring the parameters of a power grid, the parameters of the lightning current and the parameters of the switching value of a power distribution cabinet. The acquired parameters are transmitted to the data processing module through the A/D conversion module. Then the information processed by the data processing module is transmitted to the integrated communication module by the data processing module. After that, the processed information is output and displayed through the man-machine interface module. Due to the adoption of the intelligent power quality monitoring system, the parameters of the power grid, the parameters of the lightning current and the parameters of the switching value can be monitored and analyzed in real time. Meanwhile, the power quality can be accurately detected and analyzed, and the level of the power quality of the power grid is measured. Therefore, the system facilitates the analysis and judgment on the reasons for various power quality problems and provides the basis for the improvement of power quality.

Description

Intelligent Power Quality Monitoring System

technical field

The utility model belongs to the field of intelligent monitoring devices, in particular to an intelligent power quality monitoring system.

Background technique

With the wide application and development of power electronics technology, a large number of non-linear loads have been added to the power supply system, such as static converters, which are used in industrial AC-DC conversion devices ranging from low-voltage small-capacity household appliances to high-voltage large melting furnaces. The converter works in a switch mode, which will cause distortion of the voltage and current waveforms of the grid, and cause harmonic pollution of the grid. Impulsive and fluctuating loads such as: electric arc furnaces, large rolling mills, electric locomotives, etc. will not only generate A large number of high-order harmonics, and make voltage fluctuations, flicker, and three-phase unbalance become more and more serious. These adverse effects on the power grid will not only reduce the safety of the power supply and consumption equipment itself, but also seriously weaken and interfere with the economics of the power grid. On the other hand, banks, precision electronic device manufacturing, electric locomotives, computer networks, and service monitoring systems are places with high requirements for power quality. High-precision technology and equipment are essential for high-quality power Demand is increasing day by day.

The real-time dynamic monitoring of the power quality of the power grid is the premise and foundation of the comprehensive management of power quality. At present, the real-time performance of power quality monitoring is not strong, and the monitoring methods are outdated, resulting in poor timeliness of data. It is impossible to know the power quality level of each voltage level in various regions in time, and it is impossible to take corresponding measures to improve power quality in time.

Determining the cause of low power quality requires a lot of work and requires a lot of manpower and material resources to collect data. On the other hand, statistical analysis of the collected data is also required. The efficiency is low, and it often takes a long time from finding power quality problems to solving them. Insufficient data sharing capabilities and lack of experience exchange among personnel have constrained the progress of power quality monitoring.

At present, it is of great significance to improve the monitoring means, improve the real-time performance of the power quality monitoring system, and develop an intelligent power quality monitoring system with strong data analysis capabilities.

Utility model content

The technical purpose of the utility model is to solve the problems in the prior art and provide an intelligent power quality monitoring system with real-time performance and accuracy for power quality monitoring and strong data analysis capability.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an intelligent power quality monitoring system, which is characterized in that it includes a data acquisition module, a synchronous sampling A/D conversion module, a data processing module, a storage module, an alarm module, an integrated Communication module, man-machine interface module; Described data acquisition module, A/D conversion module, data processing module, integrated communication module are connected successively; Described data processing module is also connected with storage module and alarm module; Described data acquisition module The grid parameters are collected and sent to the data processing module through the A/D conversion module. The data processing module transmits the processed information to the integrated communication module, and the processed information is output and displayed on the man-machine interface module.

In the aforementioned intelligent power quality monitoring system, the grid parameters include electrical parameters, switching parameters, and lightning current parameters.

The aforementioned intelligent power quality monitoring system, the electrical parameters include voltage, current, active power, reactive power, apparent power, power factor, active energy, reactive energy, grid frequency, harmonic effective value, Harmonic voltage content rate, harmonic voltage, harmonic current, harmonic power, inter-harmonic voltage, inter-harmonic current, voltage deviation, three-phase voltage unbalance, current unbalance and transient overvoltage.

In the aforementioned intelligent power quality monitoring system, the integrated communication module is used for remote parameter setting, real-time monitoring, event query and waveform data download, and the integrated communication module includes a time synchronization module and a communication interface.

In the aforementioned intelligent power quality monitoring system, the communication interface is RS485/RS232, Ethernet interface or CAN bus.

The utility model consists of a data acquisition module, a synchronous sampling A/D conversion module, a data processing module, a storage module, an alarm module, an integrated communication module, and a man-machine interface module to form a power quality monitoring system, which monitors and analyzes the electrical parameters of the power grid in real time. Accurate detection and analysis of power quality and measurement of the power quality level of the power grid are conducive to analyzing and judging the causes of various power quality problems and providing a basis for the improvement of power quality.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Detailed ways

In order to make the technical solutions, technical features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

Referring to Fig. 1, the intelligent power quality monitoring system is characterized in that: it comprises a data acquisition module, a synchronous sampling A/D conversion module, a data processing module, a storage module, an alarm module, an integrated communication module, and a man-machine interface module; the data acquisition module , synchronous sampling A/D conversion module, data processing module, storage module, alarm module, integrated communication module, man-machine interface module constitute a hardware system; described data acquisition module, A/D conversion module, data processing module, integration The communication modules are connected sequentially; the data processing module is also connected with the storage module and the alarm module; the data acquisition module collects the grid parameters, and sends them to the data processing module through the A/D conversion module, and the data processing module transmits the processed information To the integrated communication module, the processed information is output and displayed on the human-machine interface module. Grid parameters include electrical parameters, switching parameters and lightning current parameters. Electrical parameters include voltage, current; active power, reactive power, apparent power, multi-period active power, power factor; active energy, reactive energy; grid frequency; Subharmonic voltage content rate, total distortion rate; harmonic voltage, harmonic current, harmonic power; inter-harmonic voltage, inter-harmonic current; voltage deviation, three-phase voltage unbalance, current unbalance; transient Overvoltage, voltage fluctuation and flicker (long-term flicker, short-term flicker, IEC flicker); voltage swell, voltage sag, voltage short-term interruption; power quality wave recording (over-index waveform recording). The switching parameters include the switching state of the switch in the grid, the switch position, the number of switching operations, and the switching time.

Data acquisition adopts the method of three-phase three-wire or three-phase four-wire, and the range of measurement parameters is reflected in: 1. Three-phase voltage: reference voltage 3×100VAC, 3×220/380VAC, 3×57.7/100V, measuring range 0.5～1.2 Un, limit voltage 2 Un, input impedance > 4kΩ (150V transformer); > 16kΩ (380V transformer), precision 0.2; 2. Three-phase current: reference current 1 (2) A, 1.5 (6) A, 5 (6) A, measuring range 50mA ~ 6A, power consumption < 0.05VA (single-channel rated current), precision 0.2. The accuracy of calculation parameters is as follows: power calculation accuracy: active power 0.2, reactive power 0.5, apparent power 0.5, power factor 0.5; fundamental wave phase calculation accuracy: <0.5 degrees; frequency calculation accuracy: measurement range 45 ~ 55Hz , accuracy 0.01Hz; harmonic/interharmonic accuracy: GB/T 14549 Class A, 0.5 class 2~31 harmonics, IEC 61000-4-30 Class A equipment requirements; unbalance accuracy: voltage unbalance 0.2 Level, current unbalance level 1; voltage fluctuation and flicker accuracy: level 5. Switch input: 2-way optical isolation (for switch displacement recording); switch output: 2-way relay (for failure and event alarm output).

Digital technology includes 32-bit floating-point DSP technology, 16-bit high-speed ADC technology; multi-loop electrical isolation, independent synchronous sampling calculation and processing; waveform data conforms to the data format of the recording equipment (using the general COMTRADE format); event-driven/triggered recording (indicator sudden change, switch shift, manual trigger).

The integrated communication module adopts multiple communication methods to realize remote networking (RS485, RS232, Ethernet); realizes remote parameter setting, real-time monitoring, event query, and waveform data download based on embedded Web technology; time synchronization methods include network time synchronization, GPS message time synchronization, IRIG-B code time synchronization. The integrated communication module includes a time synchronization module and a communication interface. Communication interface: 1 channel RS485/RS232 (communication protocol: 103 protocol), 1 channel high-speed Ethernet port (TCP/IP 103 protocol), 1 channel RS485/CAN bus (node internal communication, protocol self-defined).

The data processing module and storage module can enable users to set the storage time of historical data, realize transient event recording/recording, including voltage swell, sag and short-term interruption, and record the whole process event voltage and current waveform data; Index data statistics; the data processing module is connected with the alarm module to control the alarm output; realize the analysis and recording of power indicators; realize the analysis and recording of harmonics and inter-harmonics.

The man-machine interface module includes a main screen and a query interface. The main screen can display the power transformation and distribution system sub-map of the power grid, the operating status of each switch cabinet in the power grid, the main electrical parameters and switch status, real-time curves and historical curves. The interface can display the current real-time voltage and current. The system can view the historical trend of all stored data, which is convenient for engineering personnel to analyze the data of the monitored power distribution network. The standard electric energy report format can be designed according to the user's needs, and the system can automatically count. It can automatically generate various types of real-time running reports, historical reports, alarm record reports, etc., and can query and print all data values recorded by the system. The fault alarm interface automatically records the corresponding alarm information, and the time of occurrence can be queried by the user as needed.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. the intelligent power mass monitoring system is characterized in that: comprise data acquisition module, synchronized sampling A/D modular converter, data processing module, memory module, alarm module, integrated communicaton module, human-computer interface module; Described data acquisition module, A/D modular converter, data processing module, integrated communicaton module connect successively; Described data processing module also is connected with memory module and alarm module; Described data collecting module collected electrical network parameter, lightning current parameter and power distribution cabinet switch amount parameter, and be transported to data processing module through the A/D modular converter, the information that data processing module will be processed is delivered to the integrated communicaton module, and the information output of processing also is shown in human-computer interface module.

2. intelligent power mass monitoring system according to claim 1, it is characterized in that: described electrical network parameter comprises electrical quantity, switching value parameter, lightning current parameter.

3. intelligent power mass monitoring system according to claim 1, it is characterized in that: also comprise alarm module, described alarm module is connected with data processing module.

4. intelligent power mass monitoring system according to claim 2, it is characterized in that: described electrical quantity comprises voltage, electric current, active power, reactive power, applied power, power factor, active electrical degree, idle electric degree, mains frequency, harmonic wave effective value, harmonic voltage containing rate, harmonic voltage, harmonic current, harmonic power, a harmonic voltage, a harmonic current, voltage deviation, imbalance of three-phase voltage degree, current unbalance factor and transient overvoltage.

5. intelligent power mass monitoring system according to claim 1, it is characterized in that: described integrated communicaton module is used for remote parameter setting, Real-Time Monitoring, event inquiry and Wave data to be downloaded, the integrated communicaton module comprise to the time module and communication interface.