Oscillation early warning information interaction method and system for main station cooperation

Abstract

The present application belongs to the field of electric power automation, and discloses a kind of main station collaborative oscillation early warning information interaction method and system, comprising: according to the oscillation early warning analysis result of station end, generate current oscillation early warning file;Current oscillation early warning file is transmitted to main station end using file transmission mode;And when the oscillation category of current oscillation early warning file is based on real-time data, generate oscillation early warning signal, and oscillation early warning signal and the real-time measurement data of leading interval harmonic in all intervals in station end are used as oscillation early warning information, and oscillation early warning information is transmitted to main station end in message transmission mode;Current oscillation early warning file and oscillation early warning information of each station end in monitoring range are received in main station end and visualized display.It is realized that main station transmission of station end oscillation early warning, wide-area display of main station end oscillation early warning, improve the response capability of dispatching main station to respond to power grid oscillation, and guarantee power grid operation safety.

Description

Technical Field

[0001] This invention belongs to the field of power automation and relates to a method and system for exchanging oscillation early warning information in coordination between main power plants and substations. Background Technology

[0002] The current direction of energy development is the construction of new power systems, characterized by the large-scale application of renewable energy sources, especially the use of a large number of power electronic devices such as inverters. At the same time, with the widespread use of high-voltage direct current (HVDC) projects, SVG (Static Var Compensator) devices, and other power electronic devices, the proportion of power electronic devices in the entire power grid is increasing, and the entire power system is gradually showing a trend towards power electronics. This further exacerbates the occurrence of grid oscillation events and causes the oscillations to evolve from low-frequency to broadband.

[0003] Based on this, the industry has proposed a new broadband measurement technology, which can effectively avoid the limitations of WAMS oscillation frequency monitoring and realize real-time monitoring of broadband oscillations in the power grid. However, current oscillation monitoring is often a passive response after the oscillations have a significant impact, lacking early warning capabilities before power grid oscillations occur. Chinese patent application CN113985128A proposes an oscillation early warning method, system, storage medium, and server based on measurement data. Chinese patent application CN113990057B proposes a broadband oscillation early warning method, system, storage medium, and server at the substation end. Both patent applications implement oscillation early warning from two dimensions: real-time data and historical data from broadband power grid measurements, and propose specific implementation methods. However, the industry has not yet conducted research on how to externally display and transmit the oscillation early warning analysis results.

[0004] In summary, the development and construction of new power systems has promoted the large-scale development of new energy sources and the application of numerous power electronic devices, triggering a series of broadband power grid oscillation events. However, existing monitoring methods mainly focus on passive monitoring and response after oscillations occur, lacking intervention and prevention measures before oscillations occur. Although oscillation early warning methods have been proposed based on broadband measurement data, oscillation early warning is a new application function proposed for the development and construction of new power systems. Currently existing and extended communication protocols cannot support the transmission of this information. There is a lack of relevant guidance in the industry on how to effectively coordinate oscillation early warning analysis between main power plants and substations to provide support for power grid dispatch and operation monitoring, which makes it difficult to provide guidance for pre-emptive response to power grid oscillations and is detrimental to the safe and stable operation of the power grid. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for exchanging oscillation early warning information in coordination between the main plant and the substation.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a method for exchanging oscillation early warning information in a master-station coordinated manner, comprising: generating a current oscillation early warning file based on the oscillation early warning analysis results at the plant end; transmitting the current oscillation early warning file to the master station via file transfer; and when the oscillation early warning category of the current oscillation early warning file is based on real-time data, generating an oscillation early warning signal, and using the oscillation early warning signal and real-time measurement data of the dominant interharmonics in all intervals within the plant end as oscillation early warning information, and transmitting the oscillation early warning information to the master station via message transmission; and receiving and visually displaying the current oscillation early warning files and oscillation early warning information from each plant end within the monitoring range at the master station.

[0007] Optionally, generating the current oscillation warning file based on the oscillation warning analysis results from the plant / station end includes: obtaining the oscillation warning interval, oscillation warning category, oscillation warning type, and oscillation warning time of the proposed oscillation warning file based on the oscillation warning analysis results from the plant / station end; if there is a historical oscillation warning file in the plant / station end that has the same oscillation warning interval, oscillation warning category, and oscillation warning type as the proposed oscillation warning file, and the oscillation warning time is less than a preset time threshold from the current time, no oscillation warning file is generated; otherwise, the oscillation warning interval, oscillation warning time, oscillation warning category, and oscillation warning type are obtained based on the oscillation warning analysis results from the plant / station end, and the current oscillation warning file is generated by combining them in the order of plant / station name, oscillation warning interval, oscillation warning time, oscillation warning category, and oscillation warning type; wherein, the oscillation warning category includes those based on historical data and those based on real-time data; the oscillation warning type includes rapid oscillation amplification, long oscillation duration, rich interharmonic content, and excessive interharmonic amplitude.

[0008] Optionally, transmitting the current oscillation warning file to the master station via file transfer includes: receiving and responding to the master station's access request, transmitting the current oscillation warning file to the master station via file transfer according to the offline file transmission protocol, and marking the successfully transmitted current oscillation warning file with a successful transmission information flag.

[0009] Optionally, when the oscillation warning category of the current oscillation warning file is based on real-time data, generating an oscillation warning signal, and using the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant as oscillation warning information, and transmitting the oscillation warning information to the master station via message transmission, the method further includes: when the oscillation at the plant is suppressed and eliminated, or when the real-time measurement data of the dominant interharmonics in all intervals within the plant shows a continuous downward trend within a preset time period, stopping the transmission of the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant to the master station.

[0010] Optionally, the step of receiving and visually displaying the current oscillation warning files and oscillation warning information from each plant station within the monitoring range at the main station includes: acquiring the plant stations whose oscillation warning category is based on historical data to obtain a number of first plants to be displayed; acquiring and displaying the number of first plants to be displayed according to the oscillation warning time and oscillation warning type of the current oscillation warning files of each first plant to be displayed; acquiring the plant stations whose oscillation warning category is based on real-time data to obtain a number of second plants to be displayed, and identifying the oscillation warning time of each second plant to be displayed; acquiring the oscillation frequency of each second plant to be displayed according to the oscillation warning information from each plant station within the monitoring range, and grouping the second plants to be displayed with the same oscillation frequency or within a preset error range into a group to obtain a number of second plant to be displayed groups and displaying them in groups; and displaying the second plants to be displayed in association within each group of second plants to be displayed.

[0011] Optionally, it also includes: obtaining and visualizing the intervals at which oscillation warnings occur at each plant station based on the oscillation warning information at each plant station within the monitoring range at the main station.

[0012] In a second aspect, the present invention provides a main plant-station coordinated oscillation early warning information interaction system, comprising: The plant-side oscillation early warning analysis module is used to generate the current oscillation early warning file based on the oscillation early warning analysis results at the plant-side. The plant-side oscillation early warning transmission module is used to transmit the current oscillation early warning file to the master station via file transfer; and when the oscillation early warning category of the current oscillation early warning file is based on real-time data, it generates an oscillation early warning signal and uses the oscillation early warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant-side as oscillation early warning information, and transmits the oscillation early warning information to the master station via message transmission. The main station oscillation early warning display module is used to receive and visualize the current oscillation early warning files and oscillation early warning information from each plant station within the monitoring range.

[0013] Optionally, the plant-side oscillation early warning analysis module is specifically used to: obtain the oscillation early warning interval, oscillation early warning category, oscillation early warning type, and oscillation early warning time of the proposed oscillation early warning file based on the oscillation early warning analysis results at the plant-side; when there is a historical oscillation early warning file at the plant-side with the same oscillation early warning interval, oscillation early warning category, and oscillation early warning type as the proposed oscillation early warning file, and the oscillation early warning time is less than a preset time threshold from the current time, no oscillation early warning file is generated; otherwise, based on the oscillation early warning analysis results at the plant-side, the oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type are obtained, and the current oscillation early warning file is generated by combining them in the order of plant name, oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type; wherein, the oscillation early warning category includes those based on historical data and those based on real-time data; the oscillation early warning type includes oscillation amplification, long oscillation duration, rich interharmonic content, and excessive interharmonic amplitude.

[0014] Optionally, the plant-side oscillation early warning transmission module is specifically used to: receive and respond to the access request from the master station, transmit the current oscillation early warning file to the master station using file transmission according to the offline file transmission protocol, and mark the successfully transmitted current oscillation early warning file with the information that it has been successfully transmitted.

[0015] Optionally, the plant-side oscillation early warning transmission module is further configured to: stop transmitting the oscillation early warning signal and the real-time measurement data of the dominant interharmonic in all intervals within the plant-side when the oscillation at the plant-side is suppressed and eliminated, or when the real-time measurement data of the dominant interharmonic in all intervals within the plant-side shows a continuous downward trend within a preset time period.

[0016] Optionally, the main station oscillation warning display module is specifically used for: acquiring the plant terminals whose oscillation warning category is based on historical data for the current oscillation warning file, and obtaining a number of first plants to be displayed; acquiring and displaying the number of first plants to be displayed according to the oscillation warning time and oscillation warning type of the current oscillation warning file of each first plant to be displayed; acquiring the plant terminals whose oscillation warning category is based on real-time data for the current oscillation warning file, and obtaining a number of second plants to be displayed, and identifying the oscillation warning time of each second plant to be displayed; acquiring the oscillation frequency of each second plant to be displayed according to the oscillation warning information of each plant terminal within the monitoring range, and grouping the second plants to be displayed with the same oscillation frequency or within a preset error range into a group, obtaining a number of second plant to be displayed groups and displaying them in groups, and associating the second plants to be displayed within each second plant to be displayed group.

[0017] Optionally, the main station oscillation early warning display module is also used to: obtain the interval of oscillation early warning in each plant station based on the oscillation early warning information of each plant station within the monitoring range at the main station and display it visually.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a master-station collaborative oscillation early warning information exchange method. At the substation end, based on the oscillation early warning analysis results, a current oscillation early warning file is generated. Then, based on the oscillation early warning category of the current oscillation early warning file, for oscillation early warning files based on historical data (due to their low real-time requirements), the file is transmitted to the master station via file transfer. For oscillation early warning files based on real-time data (due to their high real-time requirements), an oscillation early warning signal is generated. This oscillation early warning signal, along with real-time measurement data of the dominant interharmonics in all intervals within the substation, is transmitted to the master station via message transmission. The master station then receives and visualizes the current oscillation early warning files and information from each substation within its monitoring range. This master-station collaborative method for transmitting oscillation early warning information not only simplifies the work of the master station but also ensures accurate acquisition of oscillation early warning information. It effectively supports the shift from reactive oscillation suppression to proactive intervention, effectively improving the technical level of power grid operation monitoring and ensuring power grid operation safety. Attached Figure Description

[0019] Figure 1 This is a flowchart of the oscillation early warning information interaction method for main plant and substation coordination according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the main station's visualization of a single plant oscillation early warning scenario according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the main station's visualization of a multi-plant oscillation early warning scenario according to an embodiment of the present invention.

[0022] Figure 4 This is a block diagram of the main plant-station coordinated oscillation early warning information interaction system according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram illustrating an application scenario of the main plant-station coordinated oscillation early warning information interaction system according to an embodiment of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 In one embodiment of the present invention, a method for exchanging oscillation early warning information in coordination between the main power plant and the substation is provided. This method enables the main station to transmit oscillation early warnings from the substation and to display the oscillation early warnings over a wide area, effectively improving the dispatching main station's ability to respond to power grid oscillations and ensuring the safe operation of the power grid.

[0027] Specifically, the method for exchanging oscillation early warning information in coordination between the main power plant and the substation includes the following steps: S1: Generate the current oscillation warning file based on the oscillation warning analysis results from the plant / station end; S2: Transmit the current oscillation warning file to the master station via file transfer; and when the oscillation warning category of the current oscillation warning file is based on real-time data, generate an oscillation warning signal, and use the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant as oscillation warning information, and transmit the oscillation warning information to the master station via message transmission.

[0028] S3: Receives and visualizes the current oscillation warning files and oscillation warning information from each plant station within the monitoring range at the main station.

[0029] This invention discloses a master-station collaborative oscillation early warning information exchange method. At the substation end, based on the oscillation early warning analysis results, a current oscillation early warning file is generated. Then, based on the oscillation early warning category of the current oscillation early warning file, for oscillation early warning files based on historical data (due to their low real-time requirements), the file is transmitted to the master station via file transfer. For oscillation early warning files based on real-time data (due to their high real-time requirements), an oscillation early warning signal is generated. This oscillation early warning signal, along with real-time measurement data of the dominant interharmonics in all intervals within the substation, is transmitted to the master station via message transmission. The master station then receives and visualizes the current oscillation early warning files and information from each substation within its monitoring range. This master-station collaborative method for transmitting oscillation early warning information not only simplifies the work of the master station but also ensures accurate acquisition of oscillation early warning information. It effectively supports the shift from reactive oscillation suppression to proactive intervention, effectively improving the technical level of power grid operation monitoring and ensuring power grid operation safety.

[0030] In one possible implementation, generating the current oscillation warning file based on the oscillation warning analysis results at the plant / station end includes: obtaining the oscillation warning interval, oscillation warning category, oscillation warning type, and oscillation warning time of the proposed oscillation warning file based on the oscillation warning analysis results at the plant / station end; if there is a historical oscillation warning file at the plant / station end that has the same oscillation warning interval, oscillation warning category, and oscillation warning type as the proposed oscillation warning file, and the oscillation warning time is less than a preset time threshold from the current time, no oscillation warning file is generated; otherwise, the oscillation warning interval, oscillation warning time, oscillation warning category, and oscillation warning type are obtained based on the oscillation warning analysis results at the plant / station end, and the current oscillation warning file is generated by combining them in the order of plant / station name, oscillation warning interval, oscillation warning time, oscillation warning category, and oscillation warning type.

[0031] The oscillation warning categories include those based on historical data and those based on real-time data; the oscillation warning types include those with rapid oscillation amplification, long oscillation duration, rich interharmonic content, and excessive interharmonic amplitude.

[0032] Specifically, if all substations within the main station's dispatch range are equipped with oscillation monitoring equipment, such as the newly proposed broadband measurement device, then oscillation early warning analysis can be performed based on real-time monitoring of interharmonic wave measurements in each electrical bay within the substation. The measurement data here refers to broadband measurements, including real-time measurements of the grid fundamental frequency, interharmonic waves, and harmonic waves. The measurement range is generally 0~2500Hz, but can be wider. There are two types of early warnings: one is based on the changing trends and duration of interharmonic wave monitoring data. This type of warning serves as a preemptive reminder before further deterioration of oscillations, facilitating early intervention and response by dispatching personnel. In this embodiment, this type of oscillation early warning is considered to be based on real-time data. The other type is based on statistical analysis of historical interharmonic wave monitoring data to clarify the distribution patterns of interharmonic waves in each bay within the substation, including the type and content of interharmonic waves. This type of warning is merely an assessment and prediction of potential oscillation risks. In this embodiment, this type of oscillation early warning is considered to be based on historical data. It differs from oscillation early warning based on real-time data. The former provides an early warning before an oscillation has occurred but has not yet reached the alarm threshold, while the latter only screens potential oscillation risk points when no oscillation has occurred.

[0033] For oscillation early warning analysis results, the preferred method is to record and transmit the results via files. The oscillation early warning files will be in XML format, using a hierarchical structure of "plant-interval-time-category-type" to record relevant content. To facilitate differentiation between oscillation early warning files, files generated in different time periods will be named using this structure. Plants and intervals will use the unified names and labels used in dispatching and operation monitoring. Time will be identified using "year-month-day_hour-minute-second_millisecond". Both oscillation early warning categories and types will be numbered using data, such as 01, 02, etc. The oscillation early warning categories are divided into two types: one based on historical data and the other based on real-time monitoring data, represented by 01 and 02 respectively. For oscillation early warnings based on historical data, the specific oscillation early warning types can be divided into two categories: abundant interharmonic content and excessive interharmonic amplitude, with 01 indicating abundant interharmonic content and 02 indicating excessive interharmonic amplitude.

[0034] For example, if a generated oscillation warning file is named "AB001-1102-20230227_155712_100-01-01", it means that an oscillation warning occurred in electrical bay 1102 of substation AB001 at 15:57:12:100ms on February 27, 2023. The oscillation warning is based on historical data analysis and is due to the relatively high interharmonic content.

[0035] Furthermore, after an oscillation warning is generated and an analysis file is created, the oscillation may persist for an extended period due to reasons such as the oscillation continuing or the dispatch master station failing to intervene in a timely manner. Therefore, duplicate generation of oscillation warnings for the same plant interval should be avoided. If no oscillation warning file has been generated within the same plant interval, it should be generated immediately upon reaching an oscillation warning conclusion. If an oscillation warning file has already been generated for the same interval within the same plant, a comprehensive analysis combining the oscillation warning time, oscillation warning category, and oscillation warning type is required. First, query the existing warning analysis files within this interval that contain oscillation warning files of the same oscillation warning category and type as the one to be generated. Select the most recently generated oscillation warning file from these files and compare its time with the oscillation warning time of the file to be generated. If the time difference is within a set time threshold, it is considered not a new oscillation warning but a continuation of the existing one, and no new oscillation warning file is generated; otherwise, a new oscillation warning file is generated. If no oscillation warning file of the same oscillation warning category and type is found, the oscillation warning file is generated directly.

[0036] Specifically, oscillation early warning analysis based on historical data only provides oscillation early warning files, while real-time early warning based on real-time measurement data provides both alarm message transmission and the generation of oscillation early warning files. The reason for generating an oscillation early warning file for early warnings based on real-time monitoring data is mainly to save early warning records for easy post-event statistics; it is also to avoid repeated oscillation warnings.

[0037] For example, if real-time monitoring detects a rapidly amplifying oscillation, the device will issue a warning. At this point, the main dispatch station may fail to take timely action, or its actions may be ineffective, the oscillation persists, or it may continue to increase. The amplification rate may remain unchanged, or intervention may have mitigated the amplification. Regardless, the oscillation frequency may remain the same, for example, around 34.1 Hz, and all warnings will be issued for the same oscillation. Therefore, repeated warnings should be avoided within a short period. A new oscillation warning file will only be generated if the oscillation persists after a considerable interval, or if a new oscillation warning occurs. For example, if the previous oscillation was around 34.1 Hz, and real-time monitoring detects a 27 Hz oscillation that is amplifying, then this can be considered a new oscillation event and a warning will be issued.

[0038] In one possible implementation, the step of transmitting the current oscillation warning file to the master station via file transfer includes: receiving and responding to the master station's access request, transmitting the current oscillation warning file to the master station via file transfer according to the offline file transmission protocol, and marking the successfully transmitted current oscillation warning file with a successful transmission information flag.

[0039] Specifically, the master station requests oscillation warning files from the plant station via a timed call. The specific time interval can be flexibly set, such as 1 minute or 5 minutes. The plant station transmits the files to the master station using an offline file protocol. The plant station marks each successfully transmitted oscillation warning file. Based on this, for each call from the master station, the plant station only transmits the most recently generated oscillation warning file.

[0040] Specifically, for oscillation warning files based on historical data, the real-time requirements are relatively low, so file transfer is sufficient to meet engineering requirements. However, for oscillation warnings based on real-time data, if the oscillation amplification speed is fast, file transfer is insufficient to quickly transmit the oscillation warning results to the master station. In such cases, a parallel transmission method using both file transfer and traditional protocols is adopted. First, the oscillation warning file is still generated normally, but for warnings of oscillation category 02, i.e., oscillation warnings based on real-time data, the status word identifier in GB / 26865.2 is extended, and an empty bit is selected as the oscillation warning information, which is transmitted to the master station in real time along with the message. Simultaneously, the dominant interharmonic quantities in all bays within the plant are transmitted to the master station in real time. The master station can determine the bay where the oscillation warning occurred based on the interharmonic measurement data of all bays within the plant and intervene in the oscillation in a timely manner.

[0041] In one possible implementation, when the oscillation warning category of the current oscillation warning file is based on real-time data, generating an oscillation warning signal, and using the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant as oscillation warning information, and transmitting the oscillation warning information to the master station via message transmission, the method further includes: when the oscillation at the plant is suppressed and eliminated, or when the real-time measurement data of the dominant interharmonics in all intervals within the plant shows a continuous downward trend within a preset time period, stopping the transmission of the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant to the master station.

[0042] Specifically, if the oscillation is suppressed and eliminated, the bit of the oscillation warning signal is reset to 0, and data transmission between the substation and the master station stops. Furthermore, if the oscillation persists within a preset time period, but the interharmonic data at the substation has shown a continuous downward trend, the transmission of interharmonic measurement data between the substation and the master station stops. It should be noted that the grid fundamental frequency data is used for WAMS monitoring, therefore it is continuously transmitted; the data transmission triggered after the oscillation warning occurs is the dominant interharmonic measurement data.

[0043] In one possible implementation, the step of receiving and visually displaying the current oscillation warning files and oscillation warning information from each plant station within the monitoring range at the main station includes: acquiring the plant stations whose oscillation warning category is based on historical data to obtain a number of first plants to be displayed; acquiring and displaying the number of first plants to be displayed according to the oscillation warning time and oscillation warning type of the current oscillation warning files of each first plant to be displayed; acquiring the plant stations whose oscillation warning category is based on real-time data to obtain a number of second plants to be displayed, and identifying the oscillation warning time of each second plant to be displayed; acquiring the oscillation frequency of each second plant to be displayed according to the oscillation warning information from each plant station within the monitoring range, and grouping the second plants to be displayed with the same oscillation frequency or within a preset error range to obtain a number of second plant to be displayed groups and displaying them in groups; and displaying the second plants to be displayed in association within each group of second plants to be displayed.

[0044] Specifically, the master station parses the oscillation warning file and displays the affected substations across a wide area. The master station can clearly obtain the specific substation names and their associated electrical bays. See also... Figure 2 In this embodiment, an arrow is used above the plant node to indicate that the plant has experienced an oscillation warning.

[0045] Furthermore, if the voltage level of the relevant substation is relatively low and outside the monitoring range of the current master station, the relevant information can be forwarded to the next lower-level master station. For example, provincial and higher-level master stations mainly focus on substation bays with voltage levels of 220kV and above. Although a 220kV substation is within the monitoring range of the provincial dispatch master station, if the warning is issued for its 110kV renewable energy access bay, the provincial master station may not be monitoring the 110kV voltage level. Therefore, it can forward the warning to the prefecture-level master station for intervention and adjustment to ensure the oscillation warning disappears and reduce the risk of oscillation at the renewable energy substation. If the bay of the relevant substation is within the monitoring range of the master station, at a certain moment, all substations with oscillation warnings within the wide area of ​​the region can be fully acquired and comprehensively displayed according to the oscillation warning category and type of each substation. This information can guide dispatch operators to take targeted interventions and improve the margin for safe and stable operation of the power grid.

[0046] Meanwhile, due to the propagation characteristics of oscillations, multiple plants involved in oscillation propagation may issue oscillation warnings at the same or relatively close times. The main station will uniformly identify the relevant plants to facilitate the identification of the areas affected by the oscillation and to carry out targeted prevention and intervention.

[0047] The above process mainly describes the process at the master station after a single oscillation propagates to multiple power plants. However, in actual operation, multiple oscillations with different frequencies may occur simultaneously or sequentially. These oscillations may be independent or overlapping. For example, some key power plants may detect multiple different oscillation signals. Therefore, the master station needs to differentiate and correlate these multiple oscillation events according to their oscillation frequency error range. See also... Figure 3 In this embodiment, different oscillation wave regions are divided and displayed based on the oscillation frequency, namely the second group of power plants to be displayed. Different second groups of power plants to be displayed are grouped together to respond promptly to early warning situations, prevent further amplification of oscillations, and quickly suppress the occurrence of oscillation events. Due to the differences in harmonic measurement data between power plants, the measured oscillation frequency of the same oscillation frequency will have a certain deviation due to the power grid topology or differences in equipment from different manufacturers. However, the deviation is generally small. Therefore, a certain error range can be set for the frequency. Oscillation frequencies with the same frequency or errors within a certain error range are regarded as the same oscillation and displayed together.

[0048] As for the effect of oscillation intervention, it can be observed through the oscillation early warning information transmitted in real time at the plant. Once the oscillation is suppressed, the transmission of oscillation early warning information at the plant will be stopped.

[0049] In one possible implementation, the main station collaborative oscillation early warning information interaction method further includes: obtaining the interval of oscillation early warning in each station based on the oscillation early warning information of each station within the monitoring range at the main station end and displaying it visually.

[0050] Specifically, for oscillation warnings based on real-time data, the master station can quickly acquire oscillation warning information, i.e., receive real-time measurement data of one or more dominant interharmonic signals transmitted from the plant terminals, generally including frequency, amplitude, and phase. At this time, the master station can continuously monitor the plant terminals and intervals that trigger interharmonic data transmission and determine the intervals where oscillation warnings occur within each plant terminal. In addition, oscillation warning files are also generated based on real-time data, but the oscillation warning information is preferentially transmitted to the master station via messages. When the master station triggers the warning at a set time, the oscillation warning analysis file generated based on real-time data is also transmitted to the dispatch master station. Dispatch operators can then compare and analyze the oscillation warning type provided in the oscillation warning file (e.g., rapid amplitude amplification or long oscillation time) with the real-time oscillation warning information transmitted from the plant terminals, facilitating a clearer understanding of the cause of the warning and the development of accurate response strategies.

[0051] The following are embodiments of the apparatus of the present invention, which can be used to execute embodiments of the method of the present invention. For details not disclosed in the apparatus embodiments, please refer to the embodiments of the method of the present invention.

[0052] See Figure 4 In another embodiment of the present invention, a master-station coordinated oscillation early warning information interaction system is provided, which can be used to implement the above-mentioned master-station coordinated oscillation early warning information interaction method. Specifically, the master-station coordinated oscillation early warning information interaction system includes a plant-side oscillation early warning analysis module, a plant-side oscillation early warning transmission module, and a master-station oscillation early warning display module.

[0053] The system includes: a plant-side oscillation early warning analysis module for generating a current oscillation early warning file based on the analysis results; a plant-side oscillation early warning transmission module for transmitting the current oscillation early warning file to the master station via file transfer; and a module for generating an oscillation early warning signal when the oscillation early warning category of the current oscillation early warning file is based on real-time data, using the oscillation early warning signal and real-time measurement data of the dominant interharmonics in all intervals within the plant-side as oscillation early warning information, and transmitting the oscillation early warning information to the master station via message transmission. The master station-side oscillation early warning display module is used to receive and visualize the current oscillation early warning files and oscillation early warning information from each plant-side within the monitoring range.

[0054] See Figure 5 This paper illustrates an application scenario of the oscillation early warning information interaction system for master station collaboration of the present invention. The master station-side oscillation early warning display module is located at the dispatch master station, while the plant-side oscillation early warning analysis module and the plant-side oscillation early warning transmission module are both located at the plant. The plant-side oscillation early warning analysis module can be located in the broadband measurement processing unit within the plant to interface with the measurement data from the broadband measurement devices in each bay within the plant.

[0055] In one possible implementation, the plant-side oscillation early warning analysis module is specifically used to: obtain the oscillation early warning interval, oscillation early warning category, oscillation early warning type, and oscillation early warning time of the proposed oscillation early warning file based on the oscillation early warning analysis results at the plant-side; when there is a historical oscillation early warning file at the plant-side with the same oscillation early warning interval, oscillation early warning category, and oscillation early warning type as the proposed oscillation early warning file, and the oscillation early warning time is less than a preset time threshold from the current time, no oscillation early warning file is generated; otherwise, based on the oscillation early warning analysis results at the plant-side, the oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type are obtained, and the current oscillation early warning file is generated by combining them in the order of plant name, oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type.

[0056] In one possible implementation, the plant-side oscillation early warning transmission module is specifically used to receive and respond to the access request from the master station, transmit the current oscillation early warning file to the master station using a file transfer method according to the offline file transmission protocol, and mark the successfully transmitted current oscillation early warning file with a successful transmission information.

[0057] In one possible implementation, the plant-side oscillation early warning transmission module is further configured to: stop transmitting oscillation early warning signals and real-time measurement data of dominant interharmonics in all intervals within the plant-side when the oscillation at the plant-side is suppressed and eliminated, or when the real-time measurement data of dominant interharmonics in all intervals within the plant-side shows a continuous downward trend within a preset time period.

[0058] In one possible implementation, the main station oscillation warning display module is specifically used for: acquiring the current oscillation warning files of the plant terminals whose oscillation warning category is based on historical data, and obtaining a number of first plants to be displayed; acquiring and displaying the number of first plants to be displayed according to the oscillation warning time and oscillation warning type of the current oscillation warning files of each first plant to be displayed; acquiring the current oscillation warning files of the plant terminals whose oscillation warning category is based on real-time data, and obtaining a number of second plants to be displayed, and identifying the oscillation warning time of each second plant to be displayed; acquiring the oscillation frequency of each second plant to be displayed according to the oscillation warning information of each plant terminal within the monitoring range, and grouping the second plants to be displayed with the same oscillation frequency or with an error within a preset error range into a group, obtaining a number of second plant to be displayed groups and displaying them in groups, and associating each second plant to be displayed group within each second plant to be displayed group.

[0059] In one possible implementation, the master station oscillation early warning display module is further used to: obtain the interval of oscillation early warning in each plant station based on the oscillation early warning information of each plant station within the monitoring range at the master station and display it visually.

[0060] All relevant content of each step involved in the aforementioned embodiment of the main plant-station coordinated oscillation early warning information interaction method can be referenced from the functional description of the corresponding functional module of the main plant-station coordinated oscillation early warning information interaction system in the embodiment of the present invention, and will not be repeated here.

[0061] The module division in this embodiment of the invention is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the invention can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0062] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0063] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0064] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0065] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for exchanging oscillation early warning information in a coordinated manner between a main plant and a substation, characterized in that, include: Based on the oscillation early warning analysis results at the plant / station level, generate the current oscillation early warning file; The current oscillation warning file will be transmitted to the main station via file transfer. And when the oscillation warning category of the current oscillation warning file is based on real-time data, an oscillation warning signal is generated, and the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant are used as oscillation warning information, and the oscillation warning information is transmitted to the master station in the form of a message transmission. The main station receives and visualizes the current oscillation warning files and oscillation warning information from each plant station within the monitoring range. The process of receiving and visually displaying the current oscillation warning files and oscillation warning information from each plant station within the monitoring range at the main station includes: The oscillation warning category is obtained from the current oscillation warning files of the plant terminals based on historical data, resulting in several first plants terminals to be displayed; the oscillation warning time and oscillation warning type of the current oscillation warning files of each first plant terminal to be displayed are obtained and displayed. The system acquires the current oscillation warning files based on real-time data from the plant terminals, obtains several second plants to be displayed, and identifies the oscillation warning time of each second plant to be displayed. Based on the oscillation warning information of each plant terminal within the monitoring range, the system acquires the oscillation frequency of each second plant to be displayed, and groups the second plants to be displayed with the same oscillation frequency or within a preset error range, obtaining several groups of second plants to be displayed and displaying them in groups. The system also associates and displays the second plants to be displayed within each group of second plants to be displayed.

2. The method for exchanging oscillation early warning information in a coordinated manner between the main plant and the substation according to claim 1, characterized in that, The process of generating the current oscillation warning file based on the oscillation warning analysis results from the plant / station end includes: Based on the oscillation early warning analysis results at the plant and substation, the oscillation early warning interval, oscillation early warning category, oscillation early warning type, and oscillation early warning time of the proposed oscillation early warning file are obtained; If any historical oscillation warning file exists in the plant terminal and has the same oscillation warning interval, oscillation warning category, and oscillation warning type as the oscillation warning file to be generated, and the oscillation warning time is less than the current time threshold, then no oscillation warning file will be generated. Otherwise, based on the oscillation early warning analysis results from the plant / station end, the oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type are obtained, and the current oscillation early warning file is generated by combining them in the order of plant / station name, oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type. The oscillation warning categories include those based on historical data and those based on real-time data; the oscillation warning types include those with rapid oscillation amplification, long oscillation duration, rich interharmonic content, and excessive interharmonic amplitude.

3. The method for exchanging oscillation early warning information in a coordinated manner between the main plant and the substation according to claim 1, characterized in that, The step of transmitting the current oscillation warning file to the main station via file transfer includes: It receives and responds to the access request from the master station, transmits the current oscillation warning file to the master station using file transfer according to the offline file transmission protocol, and marks the successfully transmitted current oscillation warning file with a successful transmission information.

4. The method for exchanging oscillation early warning information in coordination with the main plant as described in claim 1, characterized in that, When the oscillation warning category of the current oscillation warning file is based on real-time data, an oscillation warning signal is generated, and the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant terminal are used as oscillation warning information, and the oscillation warning information is transmitted to the master station in a message transmission manner, the method further includes: When the oscillation at the plant end is suppressed and eliminated, or when the real-time measurement data of the dominant interharmonic in all intervals within the plant end shows a continuous downward trend within a preset time period, the transmission of oscillation warning signals and real-time measurement data of the dominant interharmonic in all intervals within the plant end to the master station is stopped.

5. The method for exchanging oscillation early warning information in a coordinated manner between the main plant and the substation according to claim 1, characterized in that, Also includes: Based on the oscillation warning information from each plant station within the monitoring range, the main station obtains and visualizes the intervals at which oscillation warnings occur in each plant station.

6. A main plant-station coordinated oscillation early warning information exchange system, characterized in that, include: The plant-side oscillation early warning analysis module is used to generate the current oscillation early warning file based on the oscillation early warning analysis results at the plant-side. The plant-level oscillation warning transmission module is used to transmit the current oscillation warning file to the main station via file transfer. And when the oscillation warning category of the current oscillation warning file is based on real-time data, an oscillation warning signal is generated, and the oscillation warning signal and the real-time measurement data of the dominant interharmonics in all intervals within the plant are used as oscillation warning information, and the oscillation warning information is transmitted to the master station in the form of a message transmission. The main station oscillation early warning display module is used to receive and visualize the current oscillation early warning files and oscillation early warning information from each plant station within the monitoring range at the main station. The main station-side oscillation early warning display module is specifically used for: The oscillation warning category is obtained from the current oscillation warning files of the plant terminals based on historical data, resulting in several first plants terminals to be displayed; the oscillation warning time and oscillation warning type of the current oscillation warning files of each first plant terminal to be displayed are obtained and displayed. The plant terminal that obtains the current oscillation warning file based on real-time data is obtained, and several second plants to be displayed are identified, and the oscillation warning time of each second plant to be displayed is marked. Based on the oscillation warning information from each plant station within the monitoring range, the oscillation frequency of each second plant station to be displayed is obtained. The second plants stations to be displayed with the same oscillation frequency or within the preset error range are grouped together to obtain several groups of second plants stations to be displayed and displayed in groups. The second plants stations to be displayed in each group of second plants stations to be displayed are then displayed in a related manner.

7. The main plant-station coordinated oscillation early warning information interaction system according to claim 6, characterized in that, The plant-level oscillation early warning and analysis module is specifically used for: Based on the oscillation early warning analysis results at the plant and substation, the oscillation early warning interval, oscillation early warning category, oscillation early warning type, and oscillation early warning time of the proposed oscillation early warning file are obtained; If any historical oscillation warning file exists in the plant terminal and has the same oscillation warning interval, oscillation warning category, and oscillation warning type as the oscillation warning file to be generated, and the oscillation warning time is less than the current time threshold, then no oscillation warning file will be generated. Otherwise, based on the oscillation early warning analysis results from the plant / station end, the oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type are obtained, and the current oscillation early warning file is generated by combining them in the order of plant / station name, oscillation early warning interval, oscillation early warning time, oscillation early warning category, and oscillation early warning type. The oscillation warning categories include those based on historical data and those based on real-time data; the oscillation warning types include those with rapid oscillation amplification, long oscillation duration, rich interharmonic content, and excessive interharmonic amplitude.

8. The main plant / station coordinated oscillation early warning information interaction system according to claim 6, characterized in that, The plant-side oscillation early warning transmission module is specifically used for: It receives and responds to the access request from the master station, transmits the current oscillation warning file to the master station using file transfer according to the offline file transmission protocol, and marks the successfully transmitted current oscillation warning file with a successful transmission information.

9. The main plant / station coordinated oscillation early warning information interaction system according to claim 6, characterized in that, The plant-side oscillation early warning transmission module is also used for: When the oscillation at the plant end is suppressed and eliminated, or when the real-time measurement data of the dominant interharmonic in all intervals within the plant end shows a continuous downward trend within a preset time period, the transmission of oscillation warning signals and real-time measurement data of the dominant interharmonic in all intervals within the plant end to the master station is stopped.

10. The main plant / station coordinated oscillation early warning information interaction system according to claim 6, characterized in that, The main station oscillation early warning display module is also used to: obtain the interval of oscillation early warning in each plant station based on the oscillation early warning information of each plant station within the monitoring range at the main station and display it visually.

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