TWI784736B - Wide-area synchronizer of power system - Google Patents

Abstract

The present invention relates to a wide-area synchronizer of power system. A plurality of synchronization capture modules are respectively deposed in a plurality of monitoring stations of the power system to capture real-time electricity data from each monitoring station. The real-time electricity data is collected to a central monitoring station. When the power system is splitted or blackout to two splitted power systems in any two of areas, the central monitoring station immediately calculate a real-time electricity data difference. The real-time electricity data difference is further sent to two display and user interfaces at two substations of two slplitted power systems through the intranet. The local operators at the two substations of two splitted power systems directly obtains system joint operation references to proceed system joint operation, so the time of the system joint operation is shortened, and the success rate of the system joint operation is increased.

Description

Wide Area Synchronizer System for Power System

The invention relates to a synchronizer used in joint operation of electric power system, especially a wide-area synchronizer.

The probability of power system splitting or total blackout is very low, so most of the on-duty dispatchers or on-site operators in power plants, substations, and dispatch centers at all levels have no practical experience in system connection operations.

When the two split power systems are combined, it is usually carried out in the substation, but because the substation does not have an automatic coupling device, when the traditional system is combined, the synchronizer is connected to both ends of the substation Phase a of the power supply is compared, and the real-time phase angle difference of the two power supplies is displayed. When the pointer of the synchrometer is fixed at a certain position angle, it means that the two ends are of the same power system (same frequency); otherwise, if the pointer rotation is not fixed, It means that the phase angle difference between the two ends changes with time (there is a frequency difference), that is, the two ends are different power systems (different frequency); therefore, the on-site operators in the substation of the two split power systems must check the synchronization The state of the pointer of the synchronizer, the central control center uses the communication device to contact the on-site operators at the two substations, and adjusts the respective generator sets to coordinate the power supply frequency and voltage until the pointer of the synchronizer is fixed at a certain position and angle Finally (usually located at 12 o'clock, that is, the voltage phase angle difference is 0 degrees), the connection of the two split power systems is completed through manual operation.

Since the substation is located in a split power system, there is not necessarily a synchronizer as a reference for system connection, which requires the experience of the operator to operate, which will increase the difficulty of operation and reduce the probability of success, and affect the restoration of the system. Time; therefore, when the power system is split or completely black, dispatchers will face the challenge of combining the two systems, and it is necessary to further propose a coping mechanism.

In view of the fact that the above-mentioned synchronizer has the disadvantage of limited geographical use, it cannot effectively carry out safe system joint operations when the power system in any region is split or completely black, so the main purpose of the present invention is to propose a wide-area power system. Synchronizer system.

The main technical means used to achieve the above purpose is to make the wide-area synchronizer system of the power system include: multiple synchronization acquisition modules, which are used to set up multiple monitoring stations in the power system to monitor and calculate the power The real-time power data of each monitoring station of the system; a central monitoring station includes a real-time analysis module and a data storage center; wherein the real-time analysis module is connected to these synchronous acquisition modules to read any two The power data of the monitoring station, and calculate the difference between the two power data in real time, and the data storage center is connected to the real-time analysis module to store the power data of each monitoring station and the power data difference; and multiple real-time display and use The interfaces are respectively used to set up in the substations of parallel connection points and link to the central monitoring station. Each of the real-time display and user interfaces includes a real-time synchronous parallel connection display area and an operation area; wherein the operation area is for setting any two Monitoring stations for power systems; where: When any of the real-time display and user interface sets any two monitoring stations and sends them back to the central monitoring station, the real-time analysis module of the central monitoring station calculates the real-time power data difference of the two monitoring stations, and sends back and displayed on the instant sync parallel display area.

As can be seen from the above description, the wide-area synchronizer system of the present invention mainly has a plurality of synchronous acquisition modules installed in multiple monitoring stations of the power system, so as to capture the real-time power data of each monitoring station and integrate them into a central monitoring station. station; when the power systems in any two areas are split or completely black and two split power systems are generated, the central monitoring station can immediately calculate the real-time power data difference between the monitoring stations of the two split power systems, and then through the network The system is transmitted to a real-time display and user interface located in the parallel substation of the two-split power system, so that the on-site operators of the parallel substation can directly obtain the system connection operation basis, which is convenient for the system connection operation and effectively shortens the time. The parallel connection time of the system increases the success rate of the parallel connection of the system, reduces the power outage time of the user, enables the system to quickly return to normal operation, and ensures the reliability of the power supply of the power system.

10: Synchronous capture module

11: Phasor measurement unit

12: GPS receiver

20: Central monitoring station

21: Real-time analysis module

22: Data Storage Center

23:Web server

30: Real-time display and user interface

31: Operation area

32: Real-time synchronous parallel display area

321: Phase angle table

322: Phase angle difference table

323: Power factor meter

40:Network device

FIG. 1 : A schematic diagram of a system architecture of a wide-area synchronizer system of a power system according to the present invention.

Fig. 2: A schematic diagram of a real-time display and user interface of the present invention.

FIG. 3A : a schematic diagram of the real-time power data volume between two monitoring stations according to the present invention.

FIG. 3B : Another schematic diagram of the real-time power data volume between two monitoring stations according to the present invention.

Fig. 4: A schematic diagram of calculating the phase angle difference of the real-time power data obtained in Fig. 3 according to the present invention.

The present invention proposes a wide-area synchronizer system for power systems, which can be used as a basis for dispatchers and on-site operators to perform system joint operations when the power system in any region is split or completely black. The following provides examples and diagrams The main technology of the present invention will be described in detail.

First please refer to FIG. 1 , the wide-area synchronizer system of the power system of the present invention includes a plurality of synchronization acquisition modules 10 , a central monitoring station 20 and a plurality of real-time display and user interfaces 30 .

The above-mentioned multiple synchronous acquisition modules 10 are installed in multiple monitoring stations of the power system to monitor and calculate the real-time power data of each monitoring station in the power system. In this embodiment, each monitoring station includes bus bars with three different phases (phase A, phase B, and phase C), as shown in FIGS. Take the module 10, so that the power data of at least one phase of each monitoring station can be retrieved; wherein the power data of each phase includes voltage, voltage phase angle and frequency. Each of the synchronous acquisition modules 10 includes a phasor measurement unit 11 and a global positioning system receiver 12. The phasor measurement unit 11 measures the power data of the corresponding connected bus bar and calculates The phase angle of the phase, and according to the synchronous pulse wave of the GPS receiver 12, add a time stamp to the power data, because the synchronous acquisition module 10 all receives the synchronous pulse wave of the GPS receiver 12, so it can The synchronous pulse wave is used as a synchronous sampling reference signal. Each of the phasor measurement units 11 calculates the positive phase sequence voltage and phase angle by adopting a recursive discrete-time transform (Recursive DFT), that is, as shown in FIG. 3A and FIG. At the same time point, the voltage sampling data V _i and V _j are measured at the same-phase busbars of different monitoring stations a1 and a2, and the voltage phase angles δ _i and δ _j are calculated and output.

The above-mentioned central monitoring station 20 is composed of a real-time analysis module 21, a data storage center 22 and a web server 23; wherein the real-time analysis module 21 is connected to these synchronously captured Taking the module 10, it can read the power data of any two monitoring stations a1 and a2, and calculate the power data difference of the same-phase busbars of the two monitoring stations a1 and a2 in real time, which can include voltage difference, voltage phase angle difference and frequency Difference. The data storage center 22 is connected to the real-time analysis module 21 to store the power data of each monitoring station and the power data difference between specific monitoring stations, and then connect to the network (such as: Ethernet) through the web server 23 Therefore, after the web server 23 can be connected to the network device 40, the power data and the power data difference are converted into a web page format for the network device 40 to browse, so that there is no limit to the connection The number of network devices of the line can be effectively used for substations or power supply areas in various places to connect with their network devices 40.

The above-mentioned multiple real-time display and user interfaces 30 are respectively used to be set in the parallel point substation (or power supply area), and connected to the central monitoring station 20 through the network; in this embodiment, the real-time display and user interface 30 can be displayed by a network device 40, that is, the network device 40 obtains the power data difference calculated by the real-time analysis module 21 and the obtained power data through the web server 23; The user interface 30 includes an operation area 31 and a real-time synchronous parallel display area 32; wherein the operating area 31 contains at least the monitoring station options of different power systems, and the real-time synchronous parallel display area 32 displays a phase angle table 321, a The phase angle difference meter 322 and a power factor meter 323 also display real-time values such as voltage, frequency, frequency difference, real power (P), imaginary power [Q], complex power (S) and power factor (Pf). In this embodiment, the phase angle difference meter displays the phase angle differences of the three phases, and is also used to confirm whether the phase sequence of the busbars to be connected is consistent.

It can be seen from the above description that when a normal power system splits into two power systems in any two areas for some reason, the frequencies of the two power systems must be different; therefore, the central monitoring station 20 can immediately obtain the Synchronously capture the frequency returned by the module 10. After calculating the frequency difference, the system split is known and the boundary of the system split is judged; at this time, the parallel substation (or power supply area) located at the boundary of the two different frequency power systems can Connect to the web server 23 of the central monitoring station 20 through the network device 40 to display the real-time display and user interface 30, and select the monitoring stations a1 and a2 of the power system where they are located on the operating area 31, and the The central monitoring station 20 obtains the real-time power data returned by the synchronous acquisition module 10 of the two monitoring stations a1 and a2 and use the power data with the same time stamp to calculate the power data difference, and then display the power data difference on the real-time display and real-time synchronous parallel display area 32 of the user interface 30 of each parallel substation; therefore, parallel substations The on-site operator of the power station (or at the power supply area) only needs to open the real-time display and user interface 30, and select the monitoring point a2 of another power system, and the real-time display and user interface 30 can display the corresponding relationship with another power system. Angle difference, frequency difference, voltage difference, etc. Since this embodiment presents the phase angle difference in the form of a pointer table, the phase angles of the three phases are displayed in the phase angle table 321, which can be used by on-site operators to directly judge whether the absolute phase sequence is consistent, and whether the phase angles of the same phase are close, and then cooperate The phase angle difference table 322 judges whether the phase angle difference is close to the middle position of the 12 o'clock direction (that is, the phase angle difference is 0 degrees), and then confirms whether the voltage difference and the frequency difference fall within the range that can be combined, for example, the voltage difference is within 5%, and the frequency should be the same as possible; if the above conditions are met, the on-site operators can judge the appropriate time point for combination or parallel connection, and manually operate the combination or parallel operation to switch on the circuit breaker; otherwise, if If the aforementioned conditions are not satisfied, the output of the two substations needs to be adjusted. At this time, the on-site operators of the two substations can correctly adjust the output by viewing the real-time display and user interface 30. For example, if the pointer of the phase angle difference meter 322 If it turns clockwise quickly, it means that the current output frequency is greater than the output frequency of another substation (reference terminal), and the output must be adjusted to reduce the frequency until the pointer of the phase angle difference meter 322 no longer rotates, and when the phase angle When it is close, the pointer will also be close to 0 degrees; after completing the combination or parallel operation, you can check whether the combination or parallel connection is successful through the pointer position of the power factor meter 323, that is, the pointer is close to the middle position scale 1 , if it is, it means the operation is successful; therefore, it is easier for the on-site operators to adjust the output and quickly reach the appropriate combination or parallel conditions.

In summary, the setting of the wide-area synchroniser system of the present invention can conveniently make way for substations or power supply areas in different regions to directly use the network device to access the Internet to obtain the same power data as the central monitoring station, and the central monitoring station Further calculate the power data for combination or parallel connection, and display a display and user interface on the network device at each substation or power supply area, and the substation or power supply in each region Through the display and user interface, the power district obtains the power data difference and power data for combination or parallel connection, so that dispatchers and on-site operators can use the basis for system combination operations, effectively shorten the system parallel connection time, increase the success rate of system parallel connection, Reduce the power outage time of users, enable the system to quickly resume normal operation, and ensure the reliability of power supply of the power system.

The above description is only an embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with the embodiment, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field, Within the scope of not departing from the technical solution of the present invention, when the technical content disclosed above can be used to make some changes or be modified into equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the technical essence of the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

10: Synchronous capture module

11: Phasor measurement unit

12: GPS receiver

20: Central monitoring station

21: Real-time analysis module

22: Data Storage Center

23:Web server

30: Real-time display and user interface

40:Network device

Claims (9)

A wide-area synchronizer system for an electric power system, comprising: a plurality of synchronous acquisition modules, which are used to set up multiple monitoring stations of the electric power system to monitor and calculate real-time power data of each monitoring station of the electric power system; Wherein, each of the synchronous acquisition modules includes: a global positioning system receiver; and a phasor measurement unit, which is connected to the global positioning system receiver and arranged on one of the bus bars of the corresponding monitoring station, to output power data with time stamps; a central monitoring station includes a real-time analysis module and a data storage center; wherein the real-time analysis module is connected to these synchronous acquisition modules to read any two monitoring The power data of each monitoring station and the difference between the two power data are calculated in real time, and the data storage center is connected to the real-time analysis module to store the power data and the power data difference of each monitoring station; and multiple real-time display and user interfaces , which are respectively used to set up in parallel point substations and link to the central monitoring station, each of the real-time display and user interface includes a real-time synchronous parallel display area and an operation area; wherein the operation area is for setting any two power The monitoring station of the system; wherein: when any of the real-time display and user interface sets any two monitoring stations and sends them back to the central monitoring station, the real-time analysis module of the central monitoring station calculates the real-time power of the two monitoring stations The data will be sent back and displayed on the real-time synchronous parallel display area. The wide-area synchronizer system of the power system as described in claim item 1, wherein: these synchronization acquisition modules are respectively installed on the three-phase bus bars of their corresponding monitoring stations to output each phase with a time stamp power data; and the central monitoring station stores three-phase power data of each of the monitoring stations. The wide-area synchronizer system of the electric power system according to claim 1 or 2, wherein the phasor measurement unit calculates the positive phase sequence voltage and phase angle by using a recursive discrete recursive leaf transform (Recursive DFT). The wide-area synchronizer system of the electric power system as described in claim item 1, wherein: the synchronous acquisition modules are connected to the central monitoring station with a network; the central monitoring station further includes a web server, the webpage The server is connected to the data storage center; and the real-time display and user interfaces are connected to the web server through a network. The wide-area synchronizer system of the power system as claimed in claim 1 or 2, wherein the power data of the phasor measurement unit includes voltage, voltage phase angle and frequency. The wide-area synchronizer system of the power system as described in claim item 5, wherein the real-time analysis module reads the power data with the same time stamp, and calculates the power data difference in real time, which includes: voltage difference, phase angle difference and frequency difference. The wide-area synchronizer system for power systems as described in claim 5, wherein the operating area at least includes monitoring station options for different power systems. The wide-area synchronizer system of an electric power system as described in Claim 7, wherein the real-time synchronous parallel display area displays a phase angle meter, a phase angle difference meter and a power factor meter. The wide-area synchronizer system of the power system as described in claim item 8, wherein the real-time synchronous parallel display system further displays: voltage, frequency, frequency difference, real power (P), imaginary power [Q], complex power (S) And power factor (Pf).

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