Response-driven Multi-level Control Method and System for Wide-area Wide-band Oscillation

Abstract

Response-driven multi-level control method and system for wide-area broadband oscillation, determining the broadband oscillation information of the collector lines and outgoing lines; in each control round, monitoring the broadband oscillation of all un-disconnected collector lines and all outgoing lines; when it is determined according to the broadband oscillation information of the collector line that the collector line has a broadband oscillation, performing the broadband oscillation disconnection control of the collector line to disconnect the collector line with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; or, when it is determined according to the broadband oscillation information of the outgoing line that a broadband oscillation occurs in one outgoing line, performing the broadband oscillation selection and cutting control of the outgoing line to cut off the collector line with a set capacity or all the collector lines under the set bus; when it is determined according to the broadband oscillation information of the outgoing lines that broadband oscillations occur in multiple outgoing lines simultaneously, performing the broadband oscillation control between new energy power stations to cut off the collector line with a set capacity or the outgoing line with a set oscillation characteristic, avoiding the chain accident of over-cutting new energy units.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy multi-station control, and specifically, relates to a response-driven wide-area broadband oscillation multi-level control method and system. Background Art

[0002] Under the background of carbon peaking and carbon neutrality, the number and scale of grid-connected new energy power stations have increased significantly, and the dual-high characteristics of the power system have become more prominent. A large-capacity new energy power station is connected to the grid through a single-circuit line. Although the short-circuit capacity at the grid connection point of the system is sufficient and the short-circuit ratio meets the strong system indication, the short-circuit ratio of multiple power stations on the low-voltage side of the step-up transformer of the new energy power generation unit is relatively low, and there is still a large risk of broadband oscillation, especially in the regional power grid system where multiple new energy power stations are connected to the same AC substation.

[0003] In the prior art, the traditional broadband oscillation control method is to directly disconnect a single-circuit collector line when the oscillation of the collector line is monitored. However, the capacity cut off by disconnecting a single-circuit collector line is too small to eliminate the oscillation in time, which will cause the accident to expand. Moreover, due to the large number of collector lines, setting action values for each collector line is required for disconnecting the collector line alone, resulting in complex relay protection configuration and high investment; when the oscillation of the outgoing line is monitored, the entire new energy power station is cut off. Although the oscillation source can be quickly eliminated and the accident can be prevented from further spreading and expanding, when broadband oscillation phenomena occur simultaneously in multiple new energy power stations, multiple power stations are easily cut off at the same time, and the cut-off capacity is too large, which not only causes high economic losses, but more seriously, it will cause a large power impact on the main grid and trigger a frequency stability accident. Therefore, how to drive in response to real-time electrical quantities to quickly locate the broadband oscillation source and implement multi-level control of broadband oscillation to achieve refined excision of the oscillation source is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] To solve the deficiencies in the prior art, the present invention provides a response-driven wide-area broadband oscillation multi-level control method and system, which sequentially perform oscillation control in the order of collector lines, outgoing lines, and power stations, with each section of busbar in the power station as the control unit. When the collector line oscillates, the oscillating collector line and all collector lines sharing a section of busbar with the oscillating collector line are all disconnected, reasonably controlling the cut-off capacity on the basis of quickly locating the fault, and there is no need to set action values for each collector line; when a single outgoing line oscillates, all collector lines under the selected busbar are cut off according to a preset principle, and when multiple outgoing lines oscillate, a set capacity of the busbar in the corresponding power station is cut off, avoiding the economic losses and potential safety hazards caused by cutting off the entire power station while improving the speed of cutting off the oscillation source.

[0005] The present invention adopts the following technical solutions.

[0006] The present invention proposes a response-driven wide-area broadband oscillation multi-level control method, including:

[0007] Obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line;

[0008] Set the total number of control rounds for the broadband oscillation splitting control of the collector line and the broadband oscillation selective switching control of the outgoing line; In each control round, monitor the broadband oscillation of all unsplit collector lines and all outgoing lines; When it is determined according to the broadband oscillation information of the collector line that the collector line has a broadband oscillation, execute the broadband oscillation splitting control of the collector line to split the collector line with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; Or, when it is determined according to the broadband oscillation information of the outgoing line that a broadband oscillation occurs in one outgoing line, execute the broadband oscillation selective switching control of the outgoing line to cut off the collector line with a set capacity or all the collector lines under the set bus;

[0009] When it is determined according to the broadband oscillation information of the outgoing line that broadband oscillations occur simultaneously in multiple outgoing lines, execute the broadband oscillation control between new energy power stations to cut off the collector line with a set capacity or the outgoing line with a set oscillation characteristic.

[0010] Preferably, the monitoring data of the new energy power station includes: the voltage, current, frequency and power of the outgoing line, the voltage, current, frequency and power of the main transformer in the station, the voltage, current, frequency and power of the collector line, and the voltage, current, frequency and power of the SVG feeder;

[0011] The broadband oscillation information includes: broadband oscillation power, broadband oscillation current, number of oscillation cycles and oscillation duration.

[0012] Only when a broadband oscillation multi-level control device is configured at the new energy power station end as the execution station, the execution station obtains the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; In each control round, the execution station monitors the broadband oscillation of all unsplit collector lines and all outgoing lines;

[0013] When a broadband oscillation multi-level control device is configured at the new energy power station end as the execution station and a broadband oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are jointly connected as the main station, the execution station obtains the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; The execution station monitors the broadband oscillation of all unsplit collector lines; The execution station sends the broadband oscillation information of all outgoing lines to the main station, and the main station monitors the broadband oscillation of all outgoing lines.

[0014] Preferably, executing the broadband oscillation splitting control of the collector line to split the collector line with a set capacity and executing the broadband oscillation selective switching control of the outgoing line to cut off the collector line with a set capacity includes:

[0015] Calculate the sum of the amplitudes of the broadband oscillation power of the unearthed busbars in each section, or calculate the amplitude ratio of the broadband oscillation power of all unearthed busbars; wherein, the ratio of the amplitude of the broadband oscillation power to the amplitude of the fundamental frequency power is used as the amplitude ratio;

[0016] Sort the busbars in descending order according to the sum of amplitudes or the amplitude ratio;

[0017] Based on the sorting, select the busbars in sequence. When the sum of the capacities of the selected busbars is not less than the set capacity determined by the user, disconnect or cut off the selected busbars.

[0018] Preferably, when the total number of control rounds for the broadband oscillation disconnection control of the busbars is determined by the user, perform the broadband oscillation disconnection control of the busbars to disconnect the busbars with the set capacity determined by the user;

[0019] When the total number of control rounds for the broadband oscillation disconnection control of the busbars is set according to the number of busbar sections in the new energy substation, perform the broadband oscillation disconnection control of the busbars to disconnect all the busbars on the busbar where the busbar with broadband oscillation is located;

[0020] In each control round, the broadband oscillation action setting values of all busbars are the same, the broadband oscillation alarm setting values are the same, the oscillation alarm delay threshold is the same, and the oscillation cycle alarm times threshold is the same;

[0021] In each control round, the oscillation differential delay setting values of all busbars are different, the difference between adjacent two oscillation differential delay setting values is the same, the oscillation cycle number action setting values are different, and the difference between adjacent two oscillation cycle number action setting values is the same.

[0022] Preferably, in each control round, the broadband oscillation monitoring of all unearthed busbars includes determining whether a broadband oscillation alarm event occurs in the busbar;

[0023] When at least one of the following alarm conditions is met, it is determined that a broadband oscillation alarm event occurs in the busbar:

[0024] 1), Alarm condition 1: The amplitude of the broadband oscillation power of the busbar , and at the same time the number of oscillation cycles of the busbar or the oscillation duration of the busbar ; wherein, is the broadband oscillation power alarm setting value of the busbar, is the oscillation cycle alarm times threshold of the busbar, is the oscillation alarm delay threshold of the busbar;

[0025] 2), Alarm condition 2: The amplitude of the broadband oscillation current of the busbar , and at the same time or ; where is the warning setting value of the broadband oscillation current of the current collector line;

[0026] In each control round, the broadband oscillation action setting values of all current collector lines are set the same, the broadband oscillation action setting values of all outgoing lines are set the same, the oscillation level difference delay setting values are set differently, and the difference between adjacent two oscillation level difference delay setting values is the same;

[0027] Preferably, when it is determined that a broadband oscillation warning event occurs in the current collector line and at least one of the following action conditions is satisfied, it is determined that the current collector line has a broadband oscillation:

[0028] 1), Action condition 1: The broadband oscillation power amplitude of the current collector line , and at the same time the number of oscillation cycles of the current collector line or the oscillation duration of the current collector line ; where is the broadband oscillation power action setting value of the current collector line, is the action setting value of the number of oscillation cycles in the th control round, is the oscillation level difference delay setting value in the th control round, , is the number of busbars;

[0029] 2), Action condition 2: The broadband oscillation current amplitude of the current collector line , and at the same time or ; where is the broadband oscillation current action setting value of the current collector line;

[0030] Among them, the current collector lines that have been disconnected in the previous control round are not used as broadband oscillation monitoring objects in the current control round.

[0031] Preferably, when a broadband oscillation multi-level control device is configured at the new energy power station end as an execution station and a broadband oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are jointly connected as a master station, in each control round, the execution station sends the sum of the capacities of the current collector lines disconnected in the execution of the broadband oscillation disconnection control of the current collector lines to the master station.

[0032] Preferably, when the total number of control rounds of the outgoing line broadband oscillation selection and switching control is determined by the user, the outgoing line broadband oscillation selection and switching control is executed to cut off the current collector lines with the set capacity determined by the user;

[0033] When the total number of control rounds of the outgoing line broadband oscillation selection and switching control is set according to the number of busbar segments in the new energy power station, the outgoing line broadband oscillation selection and switching control is executed to cut off all the current collector lines under the set busbar;

[0034] In each control round, the wide-frequency oscillation action setting values of all outgoing lines are the same, the wide-frequency oscillation alarm setting values are the same, the oscillation alarm delay threshold is the same, and the oscillation cycle alarm count threshold is the same;

[0035] In each control round, the oscillation differential delay setting values of all outgoing lines are different, the difference between adjacent oscillation differential delay setting values is the same, the oscillation cycle count action setting values are different, and the difference between adjacent oscillation cycle count action setting values is the same.

[0036] Preferably, a busbar that satisfies any of the following conditions is a set busbar:

[0037] 1). Calculate the sum of the amplitudes of the wide-frequency oscillation power of the feeder lines on each section of the busbar, and use the busbar corresponding to the maximum sum of amplitudes as the set busbar;

[0038] 2). Calculate the amplitude ratio of the wide-frequency oscillation power of all feeder lines, and use the busbar where the feeder line with the largest amplitude ratio is located as the set busbar.

[0039] Preferably, in each control round, monitoring the wide-frequency oscillation of all outgoing lines includes determining whether a wide-frequency oscillation alarm event occurs on the outgoing line;

[0040] When a single outgoing line satisfies at least one of the following alarm conditions, it is determined that a wide-frequency oscillation alarm event has occurred on the outgoing line:

[0041] 1). Alarm condition 1: The amplitude of the wide-frequency oscillation power of the outgoing line , and at the same time the oscillation cycle count of the outgoing line or the oscillation differential delay of the outgoing line ; where is the wide-frequency oscillation power alarm setting value of the outgoing line, is the oscillation cycle alarm count threshold of the outgoing line, is the oscillation alarm delay threshold of the outgoing line;

[0042] 2). Alarm condition 2: The amplitude of the wide-frequency oscillation current of the outgoing line , and at the same time or ; where is the wide-frequency oscillation current alarm setting value of the outgoing line.

[0043] Preferably, when it is determined that a wide-frequency oscillation alarm event has occurred on the outgoing line, and a single outgoing line satisfies at least one of the following action conditions, it is determined that a wide-frequency oscillation has occurred on a single outgoing line:

[0044] 1). Action condition 1: The amplitude of the wide-frequency oscillation power of the outgoing line , and at the same time the oscillation cycle count of the outgoing line Or the oscillation differential delay of the outgoing line ; where is the broadband oscillation power action setting value of the outgoing line, is the action setting value of the number of oscillation cycles in the th control round, is the oscillation differential delay setting value in the th control round, , is the number of busbars;

[0045] 2) Action condition 2: The amplitude of the broadband oscillation current of the outgoing line , and at the same time or ; where is the broadband oscillation current action setting value of the outgoing line.

[0046] Preferably, when a broadband oscillation multi-level control device is configured as an execution station at the new energy power station end, and a broadband oscillation multi-level control device is configured as a master station at the AC system end where multiple new energy power stations are jointly connected, the execution station sends the broadband oscillation information of all outgoing lines, the remaining number of control rounds, and the sum of the capacities of the uncut collector lines in the new energy power station to the master station. When the master station determines that a broadband oscillation occurs in an outgoing line, it sends an instruction for outgoing line oscillation selection and switching control to the execution station. After receiving the instruction, the execution station cuts off the collector lines with a set capacity determined by the user or all the collector lines under the set busbar, and sends the sum of the capacities of the collector lines cut off during the execution of the outgoing line broadband oscillation selection and switching control to the master station.

[0047] Preferably, when only a broadband oscillation multi-level control device is configured as an execution station at the new energy power station end, the new energy power stations are grouped according to the short-circuit ratio of the new energy power stations, and the total number of control rounds for broadband oscillation control between new energy power stations is set according to the number of groups; when it is determined according to the broadband oscillation information of the outgoing lines that broadband oscillations occur simultaneously in multiple outgoing lines, the execution station executes the broadband oscillation control between new energy power stations, and selectively cuts off the collector lines with a set capacity determined by the user in sub-control rounds. And when the sum of the capacities of the collector lines cut off by the new energy power station is greater than the maximum total amount of generator tripping in the regional power grid during a single oscillation event set by the user, the execution station locks all the broadband oscillation control functions of the new energy power station;

[0048] Among them, the grouping includes: calculating the short-circuit ratio of multiple new energy power stations, and sorting each new energy power station in ascending order according to the short-circuit ratio of multiple new energy power stations; setting the number of groups , and then evenly dividing the total capacity of all new energy power stations in the regional power grid into groups to determine the capacity reference value of each group; select power stations in turn according to the sorting of new energy power stations. When the sum of the capacities of the selected power stations is equivalent to the capacity reference value of each group, the selected power stations form a group. After all groupings, the number of groups is obtained 。

[0049] Preferably, in each control round, the wide - frequency oscillation action setting values of all outgoing lines are the same, and the action delays are different. The new - energy power stations within the same group have the same action delay; the action delay satisfies the following relational expression:

[0050]

[0051] In the formula, is the action delay in the th control round, is the reference delay, 。

[0052] Preferably, in each control round, according to the set capacity determined by the user, buses within the new - energy power station group are selected so that the sum of the capacities of the selected buses is not greater than the maximum generator - tripping amount of the new - energy power station in a single oscillation event; among them, the maximum generator - tripping amount of the new - energy power station in a single oscillation event satisfies the following relational expression:

[0053]

[0054] In the formula, is the maximum generator - tripping amount of the new - energy power station in a single oscillation event, is the maximum output of the new - energy power station, is the sum of the maximum outputs of all new - energy power stations with configuration execution stations within the regional power grid, is the total maximum generator - tripping amount of the regional power grid set by the user in a single oscillation event;

[0055] And, in the th control round, if the sum of the actual generator - tripping amounts of the new - energy power stations in the 1st to th control rounds is greater than the total maximum generator - tripping amount of the regional power grid set by the user in a single oscillation event , then all wide - frequency oscillation control functions of the new - energy power station are blocked.

[0056] Preferably, after selecting the buses within the new - energy power station group, calculate the sum of the amplitudes of the wide - frequency oscillation powers of the unearthed feeder lines on each selected bus section, or calculate the amplitude ratio of the wide - frequency oscillation powers of all unearthed feeder lines; among them, the ratio of the amplitude of the wide - frequency oscillation power to the amplitude of the fundamental - frequency power is used as the amplitude ratio; sort the feeder lines in descending order according to the sum of amplitudes or the amplitude ratio; based on the sorting, select feeder lines from each selected bus section in turn. When the sum of the capacities of the selected feeder lines is not less than the set capacity and not greater than the maximum generator - tripping amount of the new - energy power station in a single oscillation event, the selected feeder lines are the feeder lines of the set capacity and are cut off.

[0057] Preferably, when a broadband oscillation multi-level control device is configured as an execution station at the new energy power station end and a broadband oscillation multi-level control device is configured as a master station at the AC system end where multiple new energy power stations are commonly connected, when it is determined according to the broadband oscillation information of the outgoing line that broadband oscillations occur simultaneously in multiple outgoing lines, the master station executes broadband oscillation control between new energy power stations, selects the outgoing line according to the set oscillation characteristics determined by the user, and sends an instruction for outgoing line oscillation selection and switching control to the execution station corresponding to the selected outgoing line. After receiving the instruction, the execution station cuts off all the collector lines with the set capacity determined by the user or all the collector lines under the set bus, and sends the capacity sum of the cut-off collector lines to the master station.

[0058] Preferably, the set oscillation characteristics determined by the user include: short-circuit ratios of multiple new energy power stations, real-time equivalent impedance of the outgoing line, oscillation mode power flow direction, oscillation power amplitude, oscillation current amplitude, oscillation power amplitude ratio; the set oscillation characteristics are open for the user to select and set.

[0059] Preferably, the master station calculates the total cut-off capacity of the new energy power station according to the sum of the capacities of the collector lines disconnected in the execution of the broadband oscillation splitting control of the execution collector lines and the sum of the capacities of the collector lines cut off in the execution of the broadband oscillation selection and switching control of the outgoing line. When the total cut-off capacity is greater than the maximum total generator tripping capacity of the regional power grid set by the user in a single oscillation event, all the broadband oscillation control functions of the new energy power station are blocked.

[0060] Preferably, the action delay between each control round is a preset value in the master station, and this value is open for the grid user to set.

[0061] The present invention proposes a response-driven wide-area broadband oscillation multi-level control system, including:

[0062] When only an execution station is configured at the new energy power station end, the execution station is used to obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector lines and outgoing lines; set the total number of control rounds for the broadband oscillation splitting control of the collector lines and the broadband oscillation selective switching control of the outgoing lines; in each control round, the execution station monitors the broadband oscillations of all unsplit collector lines and all outgoing lines; when it is determined that a collector line has a broadband oscillation based on the broadband oscillation information of the collector line, perform the broadband oscillation splitting control of the collector line to split the collector lines with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; or, when it is determined that an outgoing line has a broadband oscillation based on the broadband oscillation information of the outgoing line, perform the broadband oscillation selective switching control of the outgoing line to cut off the collector lines with a set capacity or all the collector lines under a set bus; group the new energy power stations according to the short-circuit ratio of the new energy power stations, and set the total number of control rounds for the broadband oscillation control between the new energy power stations according to the number of groups; when it is determined that multiple outgoing lines have broadband oscillations simultaneously based on the broadband oscillation information of the outgoing lines, the execution station performs the broadband oscillation control between the new energy power stations, and selectively cuts off the collector lines with a set capacity determined by the user in control rounds, and when the sum of the capacities of the collector lines cut off by the new energy power station is greater than the maximum total generator tripping amount of the regional power grid set by the user in a single oscillation event, the execution station locks all the broadband oscillation control functions of the new energy power station.

[0063] The present invention also proposes another response-driven wide-area broadband oscillation multi-level control system, including:

[0064] An execution station is configured at the new energy power station end, and a master station is configured at the AC system end where multiple new energy power stations are commonly connected; each execution station communicates with the master station, and there is no communication between the execution stations;

[0065] The execution station is used to obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector lines and outgoing lines; the execution station monitors the broadband oscillations of all unsplit collector lines; the execution station sends the broadband oscillation information of all outgoing lines, the remaining number of control rounds, and the sum of the capacities of the unsplit collector lines in the new energy power station to the master station; when it is determined that a collector line has a broadband oscillation based on the broadband oscillation information of the collector line, perform the broadband oscillation splitting control of the collector line to split the collector lines with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; and send the sum of the capacities of the collector lines split in the broadband oscillation splitting control of the collector line to the master station.

[0066] The master station is used to monitor the broadband oscillation of all outgoing lines. When it is determined according to the broadband oscillation information of the outgoing line that a broadband oscillation occurs in one outgoing line, it sends an instruction for the oscillation selection and switching control of the outgoing line to the execution station. After receiving the instruction, the execution station cuts off all the collector lines with the set capacity determined by the user or all the collector lines under the set bus, and sends the capacity sum of the collector lines cut off during the execution of the broadband oscillation selection and switching control of the outgoing line to the master station. When it is determined according to the broadband oscillation information of the outgoing line that broadband oscillations occur in multiple outgoing lines simultaneously, the master station executes the broadband oscillation control between new energy power stations, selects the outgoing lines according to the set oscillation characteristics determined by the user, and sends an instruction for the oscillation selection and switching control of the outgoing line to the corresponding execution station. After receiving the instruction, the execution station cuts off all the collector lines with the set capacity determined by the user or all the collector lines under the set bus, and sends the capacity sum of the cut-off collector lines to the master station. Calculate the total cut-off capacity of the new energy power station according to the capacity sum of the collector lines disconnected during the execution of the broadband oscillation splitting control of the execution collector lines and the capacity sum of the collector lines cut off during the execution of the broadband oscillation selection and switching control of the outgoing line. When the total cut-off capacity is greater than the maximum total generator tripping capacity of the regional power grid set by the user during a single oscillation event, lock all the broadband oscillation control functions of the new energy power station.

[0067] The present invention is also a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0068] The present invention is also a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method are implemented.

[0069] The beneficial effects of the present invention are at least as follows compared with the prior art. The multi-level wide-area broadband oscillation control proposed by the present invention uses wide-area measurement and communication technologies to monitor, analyze and evaluate the real-time operating states of multiple new energy power stations in the regional power grid in real time. When the broadband oscillation action criterion is met, it triggers the millisecond-level cooperative control measures of the monitoring devices at the terminals of multiple new energy power stations in the regional power grid, realizing the rapid positioning and emergency blocking of broadband oscillations.

[0070] In view of the requirements for rapid elimination of broadband oscillations in multiple new energy power stations within a regional power grid and the problem of easy over - cutting of new energy generating units, referring to the correction control and combining the electrical quantity response and the principle of multi - round approximation, this invention proposes a three - level control method for broadband oscillation splitting of collector lines, selective cutting of broadband oscillations in outgoing lines, and control of broadband oscillations between power stations. First, for all three - level control methods, the collector line aggregation bus is selected as the control unit. By the principle of the maximum oscillation power or the maximum amplitude ratio, the possible broadband oscillation sources (including SVG and photovoltaic inverter collector line units) can be locked fastest. Second, all three - level methods adopt multi - round cutting. Only one section of the aggregation bus is cut in each round. While ensuring the rapid elimination of the oscillation source, new energy generating units are cut with as small a granularity as possible, which can avoid the phenomenon that the traditional broadband oscillation control has complex setting and control logic for dozens of collector lines and is difficult to maintain, and can also avoid a large power impact on the main grid caused by the complete cutting of the entire power station. Third, the broadband oscillation control between power stations proposed in this invention has high scalability. Newly connected new energy power stations can participate in the broadband oscillation control between new energy power stations in the regional power grid by being set into the existing broadband oscillation control rounds between power stations.

[0071] Using the method provided by this invention can improve the reliability and fineness of the existing broadband oscillation control, and can avoid chain accidents caused by over - cutting new energy generating units. Driven by real - time electrical quantity response, it can quickly locate the broadband oscillation source, and through multi - level judgment and multi - round cutting, achieve comprehensive monitoring, control, and refined cutting of new energy collector lines - buses - outgoing lines, reduce the power impact on the power grid, and improve the safety and stable operation margin of the power grid. Brief Description of the Drawings

[0072] Figure 1 It is a flowchart of a response - driven wide - area broadband oscillation multi - level control method proposed by this invention. Detailed Embodiments

[0073] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the drawings in the embodiments of this invention. The embodiments described in this application are only a part of the embodiments of this invention, rather than all embodiments. Based on the spirit of this invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of this invention.

[0074] This invention proposes a response - driven wide - area broadband oscillation multi - level control method, which is applicable to the scenario where multiple new energy power stations are connected to the same AC system and the short - circuit ratio of multiple power stations at the low - voltage side of the step - up transformers of new energy generating units is generally less than 2.0. The control method proposed in this invention is implemented through a broadband oscillation multi - level control device or system deployed at the new energy power station end.

[0075] As shown in Figure 1 the figure, the method includes:

[0076] Step 1: Obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line.

[0077] Specifically, the monitoring data of the new energy power station includes but is not limited to: the voltage, current, frequency, and power of the outgoing line, the main transformer in the station, the collector line, and the SVG; the broadband oscillation information includes but is not limited to: broadband oscillation current, broadband oscillation power, the number of oscillation cycles, and the oscillation duration.

[0078] In the embodiment, the broadband oscillation multi-level control device is deployed at the new energy power station end. The broadband oscillation multi-level control device is used to monitor the voltage, current, frequency, and power information of components such as the outgoing line, the main transformer in the station, the collector line, and the SVG feeder in real time; and calculate the broadband oscillation current and broadband oscillation power of the collector line, the SVG feeder, and the outgoing line in real time.

[0079] When only the broadband oscillation multi-level control device is configured as the execution station at the new energy power station end, the execution station obtains the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; in each control round, the execution station monitors the broadband oscillation of all un-disconnected collector lines and all outgoing lines.

[0080] When the broadband oscillation multi-level control device is configured as the execution station at the new energy power station end and the broadband oscillation multi-level control device is configured as the master station at the AC system end where multiple new energy power stations are jointly connected, the execution station obtains the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; the execution station monitors the broadband oscillation of all un-disconnected collector lines; the execution station sends the broadband oscillation information of all outgoing lines to the master station, and the master station monitors the broadband oscillation of all outgoing lines.

[0081] Step 2: Set the total number of control rounds for the broadband oscillation disconnection control of the collector line and the broadband oscillation selection and switching control of the outgoing line; in each control round, monitor the broadband oscillation of all un-disconnected collector lines and all outgoing lines; when it is determined that the collector line has a broadband oscillation according to the broadband oscillation information of the collector line, execute the broadband oscillation disconnection control of the collector line to disconnect the collector line with the set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; or, when it is determined that an outgoing line has a broadband oscillation according to the broadband oscillation information of the outgoing line, execute the broadband oscillation selection and switching control of the outgoing line to cut off the collector line with the set capacity or all the collector lines under the set bus.

[0082] In the embodiment, according to the wide - frequency oscillation control regulations of the grid - connected area power grid of the new - energy power station, the wide - frequency oscillation current and / or wide - frequency oscillation power are selected as the wide - frequency oscillation information; if it is judged that the wide - frequency oscillation current or the wide - frequency oscillation power meets the action setting value, the wide - frequency oscillation multi - level control device cuts off the new - energy units according to the three - level control method; in the existing wide - frequency oscillation control technology, there is no monitoring of the wide - frequency oscillation of the collector line and the corresponding control strategy, and the entire new - energy power station is directly cut off when the wide - frequency oscillation occurs on the outgoing line; aiming at the defects of the existing technology, the present invention proposes a three - level control method, including: wide - frequency oscillation splitting control of the collector line, wide - frequency oscillation selective switching control of the outgoing line, and wide - frequency oscillation control between new - energy power stations; the voltage levels and scopes of the control objects of the three - level control method are different. The wide - frequency oscillation splitting control of the collector line faces the collector lines with low voltage levels, and the number of collector lines of a new - energy power station is usually 40 circuits or less; the wide - frequency oscillation selective switching control of the outgoing line faces the outgoing lines of the new - energy power stations with high voltage levels, and a new - energy power station usually has only one or two outgoing lines; the wide - frequency oscillation control between new - energy power stations realizes the control between multiple new - energy power stations in the regional power grid; therefore, in the embodiment, when performing the multi - level control of the wide - frequency oscillation of multiple new - energy power stations, it is executed in the order of wide - frequency oscillation splitting control of the collector line → wide - frequency oscillation selective switching control of the outgoing line → wide - frequency oscillation control between new - energy power stations. Traditional wide - frequency oscillation control generally does not collect or judge the collector line, only judges the outgoing line. If the outgoing line meets the conditions, the entire power station is cut off, while the three - level control of collector line splitting, outgoing line selective switching, and control between power stations proposed by the present invention are all multi - round judgments and controls.

[0083] Performing wide - frequency oscillation splitting control of the collector line to split the collector line with a set capacity and performing wide - frequency oscillation selective switching control of the outgoing line to cut off the collector line with a set capacity, including:

[0084] Calculating the sum of the amplitudes of the wide - frequency oscillation powers of the unsplit collector lines on each section of the bus, or calculating the amplitude ratio of the wide - frequency oscillation powers of all unsplit collector lines; wherein, the ratio of the amplitude of the wide - frequency oscillation power to the amplitude of the fundamental - frequency power is used as the amplitude ratio;

[0085] Sorting the collector lines in descending order according to the sum of the amplitudes or the amplitude ratio;

[0086] Based on the sorting, successively select the collector lines. When the sum of the capacities of the selected collector lines is not less than the set capacity determined by the user, split or cut off the selected collector lines.

[0087] It should be noted that the method of determining the collector line with the set capacity by using the maximum sum of the amplitudes or the maximum amplitude ratio proposed in the embodiment is a non - restrictive and optimal choice. Those skilled in the art can adopt different methods according to the actual engineering situation and dispatching - related requirements to determine the collector line with the set capacity to be split or cut off.

[0088] Specifically, step 2 includes:

[0089] Step 2.1, when the total number of control rounds of the collector line broadband oscillation splitting control is determined by the user, perform the collector line broadband oscillation splitting control to split the collector lines with the set capacity determined by the user;

[0090] When the total number of control rounds of the collector line broadband oscillation splitting control is set according to the number of bus segments in the new energy substation, perform the collector line broadband oscillation splitting control to split all the collector lines on the bus where the collector line with broadband oscillation occurs;

[0091] In each control round, the broadband oscillation action setting values of all collector lines are the same, the broadband oscillation alarm setting values are the same, the oscillation alarm delay threshold is the same, and the oscillation cycle alarm count threshold is the same;

[0092] In each control round, the oscillation level difference delay setting values of all collector lines are different, the difference between adjacent two oscillation level difference delay setting values is the same, the oscillation cycle count action setting values are different, and the difference between adjacent two oscillation cycle count action setting values is the same.

[0093] In the embodiment, there are new energy substations , , ……, , ……, ; inside a new energy substation, there are circuits of collector lines , , ……, , SVG feeder lines and circuits of outgoing lines, which are respectively connected to bus segments , , ……, ; the number of collector lines and SVG feeder lines on each bus segment is basically the same, and the SVG feeder lines are regarded as collector lines;

[0094] Inside the new energy substation, according to the number of bus segments set the total number of control rounds of the collector line broadband oscillation splitting control and the outgoing line broadband oscillation selective switching control, and each control round corresponds to one bus segment;

[0095] Optionally, the total number of control rounds is set according to the number of mother lines or set by the grid user. The capacity of disconnection or removal in each control round is relatively limited. Generally, all the collector lines under one mother line are selected to determine the capacity of disconnection or removal in each control round, or a fixed capacity set by the grid user according to the actual grid conditions; moreover, the total number of control rounds and the capacity of disconnection or removal in each control round have nothing to do with whether a master station is set.

[0096] In the new energy substation, in each control round, the wide-frequency oscillation action setting values of all collector lines are the same, the wide-frequency oscillation action setting values of all outgoing lines are the same, the oscillation level difference delay setting values are different, and the difference between adjacent two oscillation level difference delay setting values is the same;

[0097] In the new energy substation, in each control round, the wide-frequency oscillation alarm setting values of all collector lines are the same, the wide-frequency oscillation alarm setting values of all outgoing lines are the same, the oscillation alarm delay thresholds of all collector lines are the same, and the oscillation alarm delay thresholds of all outgoing lines are the same.

[0098] Specifically, in each control round, the wide-frequency oscillation action setting values of each collector line are the same, and the wide-frequency oscillation action setting values of the collector line include: wide-frequency oscillation power action setting value and wide-frequency oscillation current action setting value ; in each control round, the wide-frequency oscillation action setting values of each outgoing line are the same, and the wide-frequency oscillation action setting values of the outgoing line include: wide-frequency oscillation power action setting value and wide-frequency oscillation current action setting value ;

[0099] Specifically, in each control round, the wide-frequency oscillation alarm setting values of each collector line are the same, and the wide-frequency oscillation alarm setting value is less than the wide-frequency oscillation action setting value. The wide-frequency oscillation alarm setting values of the collector line include: wide-frequency oscillation power alarm setting value and wide-frequency oscillation current alarm setting value ; in each control round, the wide-frequency oscillation alarm setting values of each outgoing line are the same, and the wide-frequency oscillation alarm setting value is less than the wide-frequency oscillation action setting value. The wide-frequency oscillation alarm setting values of the outgoing line include: wide-frequency oscillation power alarm setting value and wide-frequency oscillation current alarm setting value ;

[0100] In the existing collector line oscillation control technology, when the collector line oscillates, the oscillating collector line is disconnected. Therefore, different wide-frequency oscillation action settings and alarm settings are set for each collector line in order to locate the oscillating collector line for disconnection operations. However, with a large number of collector lines, such a parameter setting principle results in a complex configuration of relay protection devices. Based on each section of the busbar as a control unit, and combined with the electrical characteristics that the capacities of each collector line are basically the same, each control round corresponds to one section of the busbar. Therefore, in each control round, the wide-frequency oscillation action settings and wide-frequency oscillation alarm settings for each collector line are the same, making the control standards for each collector line unified and the relay protection equipment configured identically, improving the maintainability of the equipment;

[0101] Moreover, based on each section of the busbar as a control unit, when the outgoing line oscillates, the busbar is disconnected according to the principle of the maximum amplitude or the maximum amplitude ratio. Therefore, on the basis that the wide-frequency oscillation action settings and wide-frequency oscillation alarm settings for each collector line are the same in each control round, the wide-frequency oscillation action settings and wide-frequency oscillation alarm settings for each outgoing line in each control round are also set to be the same, making the control standards for each outgoing line unified and the relay protection equipment configured identically, improving the maintainability of the equipment;

[0102] Based on the above setting principles of the settings, it is convenient for the standardized construction of new energy power stations and the unified management of equipment.

[0103] In order to implement the strategy of disconnecting or selectively switching the busbar section by section according to the control rounds, in each control round, different oscillation differential delay settings are set, which are respectively 、 、……、 、……、 , and the difference between adjacent oscillation differential delay settings is the same. In the th control round, the oscillation differential delay settings for all collector lines and all outgoing lines are the same, which are all ; in each control round, the oscillation alarm delay threshold for the collector line is set to be the same as , and the oscillation alarm delay threshold for the outgoing line is set to be the same as ; the oscillation differential delay setting is greater than the oscillation alarm delay threshold.

[0104] In the embodiment, the oscillation step delay setting value in the first control round is 20 s, and the oscillation warning delay threshold is 15 s; the oscillation step delay setting value in the second control round is 40 s, and the oscillation warning delay threshold is 35 s; the oscillation step delay setting value in the third control round is 60 s, and the oscillation warning delay threshold is 55 s. When broadband oscillations occur simultaneously in multiple collector lines, if the oscillating collector lines are on different section buses, different oscillation step delay setting values are set in each control round to achieve time-sharing disconnection of different section buses. If the oscillating collector lines are on the same section bus, since the same section bus corresponds to the same control round, all oscillating collector lines can be cut off by disconnecting this section bus in the same control round, quickly realizing oscillation suppression. By the same token, different broadband oscillation warning delay thresholds are set in each control round to achieve time-sharing warning of collector line oscillations on different section buses and simultaneous warning of collector line oscillations on the same section bus.

[0105] Corresponding to the oscillation step delay setting value in each control round, different oscillation cycle number action setting values are set in each control round, which are respectively , , ……, , ……, , and the difference between adjacent oscillation cycle number action setting values is the same. In the th control round, the oscillation cycle number action setting values of all collector lines and all outgoing lines are the same, which is ; in each control round, the oscillation cycle warning number threshold of the collector line is set to be the same as , and the oscillation cycle warning number threshold of the outgoing line is set to be the same as ; the oscillation cycle number action setting value is greater than the oscillation cycle warning number threshold.

[0106] In the oscillation execution strategy, the oscillation step delay setting value corresponds to the oscillation cycle number action setting value, and the oscillation warning delay threshold corresponds to the oscillation cycle warning number threshold. In the embodiment, according to the broadband oscillation control regulations of the grid connected to the new energy power station area, the oscillation step delay setting value and / or the oscillation cycle number action setting value are selected for determination, and the oscillation warning delay threshold and / or the oscillation cycle warning number threshold are selected for warning.

[0107] Each control round corresponds to a section of bus, and different oscillation differential delay setting values (oscillation cycle number action setting values) are set for each control round, so that there is a time interval for the disconnection of different buses, providing processing time for the coordinated management of the whole station, providing an opportunity for the oscillation self-recovery of the whole station after removing some buses, and avoiding the instability and losses caused by large-scale simultaneous power outage; while the same oscillation alarm delay threshold (oscillation cycle alarm number threshold) and broadband oscillation alarm setting value are set for each control round, so as to generate alarm events for each control round with the same standard. Timely alarm is helpful for the preliminary positioning of the oscillation source and provides sufficient preparation time for the oscillation deterioration of the whole station after removing some buses.

[0108] In each control round, broadband oscillation monitoring is carried out on all un-disconnected collector lines, including judging whether a broadband oscillation alarm event occurs on the collector line;

[0109] When at least one of the following alarm conditions is met, it is determined that a broadband oscillation alarm event occurs on the collector line:

[0110] 1). Alarm condition 1: The broadband oscillation power amplitude of the collector line , and at the same time, the number of oscillation cycles of the collector line or the oscillation duration of the collector line ; where is the broadband oscillation power alarm setting value of the collector line, is the oscillation cycle alarm number threshold of the collector line, is the oscillation alarm delay threshold of the collector line;

[0111] 2). Alarm condition 2: The broadband oscillation current amplitude of the collector line , and at the same time or ; where is the broadband oscillation current alarm setting value of the collector line;

[0112] In each control round, the broadband oscillation action setting values of all collector lines are the same, the broadband oscillation action setting values of all outgoing lines are the same, and the oscillation differential delay setting values are different, and the difference between adjacent two oscillation differential delay setting values is the same;

[0113] When it is determined that a broadband oscillation alarm event occurs on the collector line and at least one of the following action conditions is met, it is determined that the collector line has a broadband oscillation:

[0114] 1). Action condition 1: The broadband oscillation power amplitude of the collector line , and at the same time, the number of oscillation cycles of the collector line or the oscillation duration of the collector line ; where is the broadband oscillation power action setting value of the collector line, is the action setting value of the number of oscillation cycles in the th control round, is the oscillation level difference delay setting value in the th control round, , is the number of busbars;

[0115] 2) Action condition 2: The amplitude of the broadband oscillation current of the collector line , and at the same time or ; where is the action setting value of the broadband oscillation current of the collector line;

[0116] Among them, the collector lines that have been disconnected in the previous control round are not used as the objects for monitoring broadband oscillation in the current control round.

[0117] In each control round, all non-disconnected collector lines are monitored for broadband oscillation. When it is determined that a collector line has a broadband oscillation based on the broadband oscillation information of the collector line, all collector lines under the busbar where the collector line with the broadband oscillation occurs are disconnected. In the control of collector line broadband oscillation disconnection, the functions with and without a master station are the same. If the collector line meets the oscillation criterion, then according to the user's specification, either disconnect the collector lines with a fixed capacity or disconnect all collector lines under a section of the busbar (control unit). The number of rounds is determined by the user or by the number of busbar segments. (When disconnecting, it can be determined according to the oscillation amplitude or the maximum amplitude ratio principle, both of which are determined by the user through the device setting values); all collector lines are calculated independently and judged independently. If the action setting value is met, then all collector lines under the busbar where the collector line is located are automatically disconnected, and the remaining collector lines are then judged.

[0118] As the number and scale of new energy power stations connected to the regional power grid gradually increase, a broadband oscillation multi-level control device is configured as an execution station at the new energy power station end, and a broadband oscillation multi-level control device is configured as the master station at the AC system end where multiple new energy power stations are jointly connected, expanding into a regional power grid new energy multi-station broadband oscillation multi-level control system. Among them, each execution station in the control system communicates with the master station, but there is no communication between the execution stations; in the control strategy of the regional power grid new energy multi-station broadband oscillation multi-level control system, the control strategy for disconnecting the collector line due to broadband oscillation remains unchanged and is executed by each execution station according to step 3.1, that is, the control logic for disconnecting the collector line has nothing to do with whether a master station is configured. When a master station is configured, in each control round, the execution station sends the sum of the capacities of the collector lines that have been disconnected to the master station. The selection and switching of outgoing lines, the coordinated control between power stations, and the maximum generator tripping amount all have different judgment logics from those without a master station.

[0119] In the embodiment, the wide-frequency oscillation splitting control of the current collector line is a multi-round control. The number of control rounds is set according to the number of bus segments, so that all current collector lines can be monitored. The current collector lines that have been split in the previous control round are not used as the objects for wide-frequency oscillation monitoring in the current control round, which can avoid repeated monitoring and is conducive to quickly locating the oscillation source. Moreover, through multiple control rounds, the simultaneous judgment of the wide-frequency oscillation of the current collector line and the time-sharing splitting of the bus where the oscillating current collector line is located are realized, which can avoid the excessive capacity of the split bus in one control round from affecting the system stability and economy, and give the current collector line time to recover from self-oscillation to avoid the expansion of the accident.

[0120] In the embodiment, the wide-frequency oscillation multi-level control system is used to compare the wide-frequency oscillation current of all current collector lines calculated in real time with the action setting value of the wide-frequency oscillation current, and / or compare the wide-frequency oscillation power of all current collector lines calculated in real time with the action setting value of the wide-frequency oscillation power. When it is determined that the action condition is satisfied according to the comparison result, the bus where the current collector line with wide-frequency oscillation occurs is split.

[0121] In the embodiment, when there is an SVG feeder on the bus, the SVG feeder is set as the current collector line and processed according to the current collector line.

[0122] When a wide-frequency oscillation multi-level control device is configured at the new energy substation end as the execution station, and a wide-frequency oscillation multi-level control device is configured at the AC system end where multiple new energy substations are jointly connected as the master station, in each control round, the execution station sends the sum of the capacities of the current collector lines split in the wide-frequency oscillation splitting control of the execution current collector line to the master station.

[0123] Step 2.2, when the total number of control rounds of the wide-frequency oscillation selection and switching control of the outgoing line is determined by the user, execute the wide-frequency oscillation selection and switching control of the outgoing line to cut off the current collector lines with the set capacity determined by the user.

[0124] When the total number of control rounds of the wide-frequency oscillation selection and switching control of the outgoing line is set according to the number of bus segments in the new energy substation, execute the wide-frequency oscillation selection and switching control of the outgoing line to cut off all current collector lines under the set bus.

[0125] In each control round, the action setting values of the wide-frequency oscillation of all outgoing lines are the same, the warning setting values of the wide-frequency oscillation are the same, the oscillation warning delay threshold is the same, and the oscillation cycle warning times threshold is the same.

[0126] In each control round, the oscillation level difference delay setting values of all outgoing lines are different, the difference between adjacent two oscillation level difference delay setting values is the same, the oscillation cycle number action setting values are different, and the difference between adjacent two oscillation cycle number action setting values is the same.

[0127] For outgoing line selection and switching, the oscillation characteristics of all busbars in the station are sorted, and the busbars to be cut are selected according to the oscillation characteristics selected by the user. The oscillation characteristics of the busbars referred to during outgoing line selection and switching are generally the maximum oscillation power, or the maximum oscillation current, or the maximum amplitude ratio of the oscillation power, i.e., the amplitude ratio. Outgoing line selection and switching also cuts all the collector lines under this busbar. Therefore, when the outgoing line also has broadband oscillation, the outgoing line broadband oscillation selection and switching control is executed to cut all the collector lines under the set busbar; among them, the busbar that meets any of the following conditions is the set busbar:

[0128] 1) Calculate the sum of the amplitudes of the broadband oscillation power of the collector lines on each busbar, and the busbar corresponding to the maximum sum of amplitudes is used as the set busbar;

[0129] 2) Calculate the amplitude ratio of the broadband oscillation power of all the collector lines, and use the busbar where the collector line with the maximum amplitude ratio is located as the set busbar; among them, the ratio of the amplitude of the broadband oscillation power to the amplitude of the fundamental frequency power is used as the amplitude ratio.

[0130] It should be noted that the method of determining the set busbar by using the maximum sum of amplitudes or the maximum amplitude ratio proposed in the embodiment is a non-restrictive and preferable choice. Those skilled in the art can adopt different methods to determine the set busbar to be cut according to the actual engineering situation and dispatching related requirements.

[0131] When the executing station determines that a broadband oscillation occurs in an outgoing line based on the broadband oscillation information of the outgoing line, all the collector lines under the set busbar are disconnected; a broadband oscillation multi-level control device is configured at the new energy power station end as the executing station, and a broadband oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are jointly connected as the master station. The executing station sends the broadband oscillation information of the outgoing line, the remaining control rounds, and the cuttable capacity in the station to the master station in real time. When the master station determines that a broadband oscillation occurs in an outgoing line based on the broadband oscillation information of the outgoing line, it sends an outgoing line oscillation selection and switching control instruction to the executing station. After receiving the instruction, the executing station disconnects all the collector lines under the set busbar and sends the capacity of the cut collector lines to the master station.

[0132] Specifically, in each control round, the broadband oscillation monitoring of all outgoing lines includes judging whether a broadband oscillation alarm event occurs for the outgoing line;

[0133] When an outgoing line meets at least one of the following alarm conditions, it is determined that a broadband oscillation alarm event occurs for the outgoing line:

[0134] 1) Alarm condition 1: The amplitude of the broadband oscillation power of the outgoing line , and at the same time the number of oscillation cycles of the outgoing line or the oscillation level difference delay of the outgoing line ; among them, It is the broadband oscillation power alarm setting value of the outgoing line. It is the threshold of the oscillation cycle alarm times of the outgoing line. It is the oscillation alarm delay threshold of the outgoing line.

[0135] 2). Alarm condition 2: The broadband oscillation current amplitude of the outgoing line , and at the same time or ; where is the broadband oscillation current alarm setting value of the outgoing line.

[0136] Specifically, when it is determined that a broadband oscillation alarm event occurs on the outgoing line, and at least one of the following action conditions is satisfied for one outgoing line, it is determined that a broadband oscillation occurs on one outgoing line:

[0137] 1). Action condition 1: The broadband oscillation power amplitude of the outgoing line , and at the same time the oscillation cycle times of the outgoing line or the oscillation differential delay of the outgoing line ; where is the broadband oscillation power action setting value of the outgoing line, is for the oscillation cycle times action setting value in the th control round, is for the oscillation differential delay setting value in the th control round,

[0138] 2). Action condition 2: The broadband oscillation current amplitude of the outgoing line , and at the same time or ; where is the broadband oscillation current action setting value of the outgoing line.

[0139] In the embodiment, the broadband oscillation selective switching control of the outgoing line is a multi-round control. The buses that have been cut off in the previous control round are not used as the broadband oscillation monitoring objects in the current control round. Moreover, in the broadband oscillation selective switching control of the outgoing line proposed by the present invention, considering the rated power of the new energy power station and the primary system wiring mode, the set buses where the collector lines converge are selected as the broadband oscillation selective switching control objects of the outgoing line, rather than directly cutting off the entire power station. And the set buses represent all the collector line positions with the largest sum of broadband oscillation power amplitudes or the collector line positions with the largest amplitude ratio. It is not only the position where the broadband oscillation of the collector line is the most serious, but also the source of the broadband oscillation of the outgoing line. Therefore, selecting and cutting the set buses is an effective measure to suppress the broadband oscillation of the outgoing line.

[0140] In the embodiment, the broadband oscillation current and power operation setting values of the outgoing line are set according to the conclusions of the electromagnetic transient simulation analysis of the regional power grid. If there is no support from the simulation analysis conclusion, it can be set with reference to similar projects in this area (considering the outgoing line voltage level of the new energy power station and the installed capacity of the new energy power station), or it can also be set with reference to similar projects in other areas.

[0141] When a broadband oscillation multi-level control device is configured at the new energy power station end as the execution station, and a broadband oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are jointly connected as the master station, the execution station sends the broadband oscillation information of all outgoing lines, the remaining number of control rounds, and the sum of the capacities of the uncut collector lines in the new energy power station to the master station. When the master station determines that a broadband oscillation occurs in an outgoing line, it sends an instruction for outgoing line oscillation selection and switching control to the execution station. After receiving the instruction, the execution station cuts off the collector lines with the set capacity determined by the user or all the collector lines under the set bus, and sends the sum of the capacities of the collector lines cut off during the execution of the outgoing line broadband oscillation selection and switching control to the master station.

[0142] Step 3: When it is determined that broadband oscillations occur simultaneously in multiple outgoing lines based on the broadband oscillation information of the outgoing lines, perform broadband oscillation control between new energy power stations to cut off the collector lines with the set capacity or the outgoing lines with the set oscillation characteristics.

[0143] Specifically, Step 3 includes:

[0144] Step 3.1: When only a broadband oscillation multi-level control device is configured at the new energy power station end as the execution station, group the new energy power stations according to the short-circuit ratio of the new energy power stations, and set the total number of control rounds for the broadband oscillation control between new energy power stations according to the number of groups; when it is determined that broadband oscillations occur simultaneously in multiple outgoing lines based on the broadband oscillation information of the outgoing lines, the execution station performs broadband oscillation control between new energy power stations, and selectively cuts off the collector lines with the set capacity determined by the user in control rounds. And when the sum of the capacities of the collector lines cut off by the new energy power station is greater than the maximum total generator tripping amount of the regional power grid set by the user during a single oscillation event, the execution station locks all the broadband oscillation control functions of the new energy power station;

[0145] Among them, the grouping includes: calculating the short-circuit ratios of multiple new energy power stations, and sorting each new energy power station in ascending order according to the short-circuit ratios of the multiple new energy power stations; setting the number of groups , and then evenly dividing the total capacity sum of all new energy power stations in the regional power grid into groups to determine the capacity reference value of each group; select power stations in sequence according to the sorting of the new energy power stations. When the sum of the capacities of the selected power stations is equivalent to the capacity reference value of each group, then form a group with the selected power stations. After all the grouping is completed, the number of groups is obtained.

[0146] In the embodiment, based on the off-line electromechanical simulation data of the power grid, a typical new energy large-generation operation mode of the power grid is selected, and the short-circuit ratios of each new energy power station are calculated and the new energy power stations are sorted in ascending order of the short-circuit ratio; the number of groups is set , and then the total capacity of all new energy power stations in the regional power grid is evenly divided into groups to determine the capacity reference value of each group; the power stations are selected in turn according to the sorting of the new energy power stations. When the sum of the capacities of the selected power stations is equivalent to the capacity reference value of each group, the selected power stations form a group. After all the grouping is completed, the number of groups is obtained. In the embodiment , takes values of 3, 4, 5, 6, 7, 8, 9, 10. In the grouping method of multiple new energy power stations proposed in the present invention, in actual engineering, the sorting of new energy power stations is determined in advance according to the short-circuit ratios of multiple new energy power stations, and the sorting is written in the wide-frequency oscillation multi-level control device in the form of a fixed value and opened to the user for setting. In this way, the capacities of each group are equivalent, and moreover, it is ensured that the new energy power stations with a high risk of wide-frequency oscillation due to a small short-circuit ratio are preferentially taken control measures in the previous control rounds.

[0147] Specifically, in each control round, the wide-frequency oscillation action setting values of all outgoing lines are the same, and the action delays are different. The new energy power stations in the same group have the same action delay; the action delay satisfies the following relational expression:

[0148]

[0149] In the formula, is the action delay in the th control round, is the reference delay, .

[0150] When multiple new energy outgoing lines in the region simultaneously meet the oscillation conditions and there is no master station, the new energy power stations in the regional power grid are divided into several groups, corresponding to several control rounds; by setting different action delays in each control round and having the same action delay within the group, time-sharing generator tripping of new energy power stations in different groups is realized, avoiding large-scale power loss of the regional power grid;

[0151] When a wide-frequency oscillation multi-level control device is configured at the new energy power station end as an execution station and a wide-frequency oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are commonly connected as a master station, the action delay between each control round is a fixed value preset in the master station, and this fixed value is developed for the power grid user to set;

[0152] In the embodiment, when broadband oscillations occur simultaneously in multiple feed-out lines, the master station selects and cuts the stations according to the oscillation characteristics of the feed-out lines of each station at the oscillation moment. After waiting for a fixed delay, the second round is judged. Still, the stations are selected and cut according to the oscillation characteristics of the feed-out lines of each station. The delay between each control round and the total number of judgment rounds can be opened to the user for setting through the setting values on the master station side.

[0153] In each control round, the busbars within the new energy station group are selected according to the set capacity determined by the user, so that the sum of the capacities of the selected busbars is not greater than the maximum generator tripping amount of the new energy station in one oscillation event; where the maximum generator tripping amount of the new energy station in one oscillation event satisfies the following relational expression:

[0154]

[0155] In the formula, is the maximum generator tripping amount of the new energy station in one oscillation event, is the maximum output of the new energy station, is the sum of the maximum outputs of the new energy stations of all configuration execution stations in the regional power grid, is the total maximum generator tripping amount of the regional power grid set by the user in one oscillation event;

[0156] And, in the th control round, if the sum of the actual generator tripping amounts of the new energy stations in the 1st to th control rounds is greater than the total maximum generator tripping amount of the regional power grid set by the user in one oscillation event , then all broadband oscillation control functions of the new energy station are blocked.

[0157] In the embodiment, each substation terminal device sets the total maximum generator tripping amount of the regional power grid in one oscillation event to be open for setting by the user; The user comprehensively sets it according to economy and security, and determines the maximum generator tripping amount of each new energy station in one oscillation event based on the total maximum generator tripping amount . When the actual generator tripping amount is greater than , it indicates that the current measures to control broadband oscillations cannot meet the economic and security requirements of the regional power grid. Therefore, the broadband oscillation control function of this new energy station is blocked. Such a setting realizes a multi-level control mode for broadband oscillations of multiple new energy stations in the regional power grid driven by the response to the economy and security of regional power grid users.

[0158] Further, in the case where there is no master station and there is no communication between new energy power stations, the three-level control is all completed by the control devices of the new energy power stations. Therefore, the maximum generator tripping amount of the new energy power stations in a single oscillation event is a fixed value. After selecting the busbars within the new energy power station group, calculate the sum of the amplitudes of the broadband oscillation power of the unearthed collector lines on each selected busbar, or calculate the amplitude ratio of the broadband oscillation power of all unearthed collector lines; wherein, the ratio of the amplitude of the broadband oscillation power to the amplitude of the fundamental frequency power is used as the amplitude ratio; sort the collector lines in descending order according to the sum of amplitudes or the amplitude ratio; based on the sorting, successively select collector lines from each selected busbar. When the sum of the capacities of the selected collector lines is not less than the set capacity and not greater than the maximum generator tripping amount of the new energy power stations in a single oscillation event, the selected collector lines are the collector lines with the set capacity and are cut off.

[0159] Step 3.2, when a broadband oscillation multi-level control device is configured at the new energy power station end as the execution station and a broadband oscillation multi-level control device is configured at the AC system end where multiple new energy power stations are commonly connected as the master station, when it is determined according to the broadband oscillation information of the outgoing line that broadband oscillations occur simultaneously in multiple outgoing lines, the master station executes the broadband oscillation control between new energy power stations, selects the outgoing line according to the set oscillation characteristics determined by the user, and sends an instruction for oscillation selection and tripping control of the outgoing line to the execution station corresponding to the selected outgoing line. After receiving the instruction, the execution station cuts off the collector lines with the set capacity determined by the user or all the collector lines under the set busbar, and sends the sum of the capacities of the cut-off collector lines to the master station.

[0160] Specifically, the set oscillation characteristics determined by the user include but are not limited to: short-circuit ratio of multiple new energy power stations, real-time equivalent impedance of the outgoing line, oscillation mode power flow direction, oscillation power amplitude, oscillation current amplitude, oscillation power amplitude ratio, and the oscillation characteristics of the outgoing line are open for the user to select and set.

[0161] It should be noted that the oscillation characteristics of the outgoing line proposed in the embodiment are a non-restrictive and relatively optimal selection. Those skilled in the art can adopt different oscillation characteristics of the outgoing line according to the actual engineering situation, relevant dispatching requirements, and actual needs of grid users.

[0162] The master station calculates the total cut-off capacity of the new energy power stations according to the sum of the capacities of the cut-off collector lines in the broadband oscillation splitting control of the execution collector lines sent by the execution station and the sum of the capacities of the cut-off collector lines in the broadband oscillation selection and tripping control of the execution outgoing line. When the total cut-off capacity is greater than the maximum generator tripping total amount of the regional power grid set by the user in a single oscillation event, all the broadband oscillation control functions of the new energy power stations are blocked. The action delay between each control round is a fixed value preset in the master station, and this fixed value is open for the grid user to set.

[0163] The present invention proposes a response-driven wide-area broadband oscillation multi-level control system, including:

[0164] When an execution station is only configured at the new energy power station side, the execution station is used to obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; set the total number of control rounds for the broadband oscillation splitting control of the collector line and the broadband oscillation selective switching control of the outgoing line; in each control round, the execution station monitors the broadband oscillation of all unsplit collector lines and all outgoing lines; when it is determined that the collector line has a broadband oscillation according to the broadband oscillation information of the collector line, execute the broadband oscillation splitting control of the collector line to split the collector line with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; or, when it is determined that an outgoing line has a broadband oscillation according to the broadband oscillation information of the outgoing line, execute the broadband oscillation selective switching control of the outgoing line to cut off the collector line with a set capacity or all the collector lines under the set bus; group the new energy power stations according to the short-circuit ratio of the new energy power stations, and set the total number of control rounds for the broadband oscillation control between the new energy power stations according to the number of groups; when it is determined that multiple outgoing lines have broadband oscillations simultaneously according to the broadband oscillation information of the outgoing lines, the execution station executes the broadband oscillation control between the new energy power stations, and selectively cuts off the collector lines with a set capacity determined by the user in control rounds, and when the sum of the capacities of the collector lines cut off by the new energy power station is greater than the maximum total generator tripping amount of the regional power grid set by the user in a single oscillation event, the execution station locks all the broadband oscillation control functions of the new energy power station.

[0165] The present invention also proposes another response-driven wide-area broadband oscillation multi-level control system, including:

[0166] An execution station is configured at the new energy power station side, and a master station is configured at the AC system side where multiple new energy power stations are jointly connected; each execution station communicates with the master station, and there is no communication between the execution stations;

[0167] The execution station is used to obtain the monitoring data of the new energy power station to determine the broadband oscillation information of the collector line and the outgoing line; the execution station monitors the broadband oscillation of all unsplit collector lines; the execution station sends the broadband oscillation information of all outgoing lines, the remaining number of control rounds, and the sum of the capacities of the unsplit collector lines in the new energy power station to the master station; when it is determined that the collector line has a broadband oscillation according to the broadband oscillation information of the collector line, execute the broadband oscillation splitting control of the collector line to split the collector line with a set capacity or all the collector lines on the bus where the collector line with the broadband oscillation is located; and send the sum of the capacities of the collector lines split in the execution of the broadband oscillation splitting control of the collector line to the master station.

[0168] The master station is used to monitor broadband oscillations for all outgoing lines. When it determines that a broadband oscillation occurs in an outgoing line based on the broadband oscillation information of the outgoing line, it sends an instruction for outgoing line oscillation selection and switching control to the execution station. After receiving the instruction, the execution station cuts off all the collector lines with a set capacity determined by the user or all the collector lines under a set bus, and sends the capacity sum of the collector lines cut off during the execution of the outgoing line broadband oscillation selection and switching control to the master station. When it determines that broadband oscillations occur simultaneously in multiple outgoing lines based on the broadband oscillation information of the outgoing lines, the master station executes broadband oscillation control among new energy power stations, selects outgoing lines according to the set oscillation characteristics determined by the user, and sends an instruction for outgoing line oscillation selection and switching control to the execution stations corresponding to the selected outgoing lines. After receiving the instruction, the execution station cuts off all the collector lines with a set capacity determined by the user or all the collector lines under a set bus, and sends the capacity sum of the cut-off collector lines to the master station. The total cut-off capacity of the new energy power station is calculated based on the capacity sum of the collector lines disconnected during the execution of the collector line broadband oscillation splitting control and the capacity sum of the collector lines cut off during the execution of the outgoing line broadband oscillation selection and switching control. When the total cut-off capacity is greater than the maximum total generator tripping capacity of the regional power grid set by the user during a single oscillation event, all the broadband oscillation control functions of the new energy power station are blocked.

[0169] The present disclosure may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium having thereon computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0170] The computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. The computer-readable storage medium may be, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punch card or raised structures in grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium as used herein is not construed as an instantaneous signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0171] The computer-readable program instructions described herein can be downloaded to various computing / processing devices from a computer-readable storage medium or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0172] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state-setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present disclosure.

[0173] 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 them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A response-driven wide-area broadband oscillation multi-level control method, characterized in that: include: Set the total number of control rounds for the collector line broadband oscillation decoupling control and the transmission line broadband oscillation selective cutting control; Only when the broadband oscillation multi-level control device is configured as an execution station at the new energy station end, the execution station obtains the monitoring data of the new energy station to determine the broadband oscillation information of the collector line and the transmission line; In each control round, the execution station performs broadband oscillation monitoring on all undecoupled collector lines and all outgoing lines; When a broadband oscillation multi-level control device is configured as an execution station at the new energy station end, and a broadband oscillation multi-level control device is configured as a master station at the AC system end to which multiple new energy stations are connected, the execution station obtains monitoring data of the new energy station to determine broadband oscillation information of the collector and transmission lines; The execution station performs broadband oscillation monitoring on all the collector lines that have not been decoupled; the execution station sends broadband oscillation information of all the outgoing lines to the master station, and the master station performs broadband oscillation monitoring on all the outgoing lines; When it is determined according to the broadband oscillation information of the collector that broadband oscillation occurs, the collector broadband oscillation decoupling control is executed to decoupling the collector of set capacity or all the collectors on the bus where the collector with broadband oscillation occurs is located; or, when it is determined according to the broadband oscillation information of the transmission line that broadband oscillation occurs in a transmission line, the transmission line broadband oscillation selection control is executed to cut off the collector of set capacity or all the collectors under the set bus; including: calculating the sum of the amplitudes of the broadband oscillation powers of the undecoupled collectors on each section of the bus, or calculating the amplitude ratio of the broadband oscillation powers of all undecoupled collectors; wherein the ratio of the amplitude of the broadband oscillation power to the amplitude of the fundamental frequency power is used as the amplitude ratio; sorting the collectors in descending order of the sum of the amplitudes or the amplitude ratio; based on the sorting, selecting the collectors in turn, and when the sum of the capacities of the selected collectors is not less than the set capacity determined by the user, decoupling or cutting off the selected collectors; When it is determined based on the broadband oscillation information of the transmission lines that broadband oscillation occurs simultaneously in multiple transmission lines, broadband oscillation control is performed between new energy stations to cut off the collector line of the set capacity or the transmission line of the set oscillation characteristic.

2. The response-driven wide-area broadband oscillation multi-level control method according to claim 1, characterized in that: The monitoring data of the new energy station include: the voltage, current, frequency and power of the transmission line, the voltage, current, frequency and power of the main transformer in the station, the voltage, current, frequency and power of the collector line, and the voltage, current, frequency and power of the SVG feeder; The broadband oscillation information includes: broadband oscillation power, broadband oscillation current, number of oscillation cycles and oscillation duration.

3. The response-driven wide-area broadband oscillation multi-level control method according to claim 1, characterized in that: When the total number of control rounds of the collector line wide-band oscillation decoupling control is determined by the user, the collector line wide-band oscillation decoupling control is performed to decoupling the collector line of the set capacity determined by the user; When the total number of control rounds of the collector line broadband oscillation decoupling control is set according to the number of bus sections in the new energy station, the collector line broadband oscillation decoupling control is executed to decoupling all the collector lines on the bus where the collector line with broadband oscillation is located; In each control round, the broadband oscillation action constant value of all collectors is set to be the same, the broadband oscillation alarm constant value is set to be the same, the oscillation alarm delay threshold is set to be the same, and the oscillation cycle alarm number threshold is set to be the same; In each control round, the oscillation level difference delay constants of all collector lines are set differently, the difference between two adjacent oscillation level difference delay constants is the same, the oscillation frequency action constants are set differently, and the difference between two adjacent oscillation frequency action constants is the same.

4. The response-driven wide-area broadband oscillation multi-level control method according to claim 3, characterized in that: In each control round, all the collector lines that have not been decoupled are monitored for wide-band oscillation, including determining whether a wide-band oscillation alarm event occurs on the collector lines; When at least one of the following alarm conditions is met, it is determined that a broadband oscillation alarm event has occurred in the collector line: 1) Alarm condition 1: Broadband oscillation power amplitude of the collector , and the number of oscillation cycles of the collector wire or the oscillation duration of the collector ;in, It is the broadband oscillation power alarm setting value of the collector line. is the threshold of the collector oscillation frequency alarm. It is the delay threshold of the collector line oscillation alarm; 2) Alarm condition 2: Amplitude of broadband oscillating current of the collector ,at the same time or ;in, It is the alarm setting value of the wide-frequency oscillating current of the collector; In each control round, the broadband oscillation action constants of all collector lines are set the same, the broadband oscillation action constants of all transmission lines are set the same, the oscillation level difference delay constants are set differently, and the difference between two adjacent oscillation level difference delay constants is the same.

5. The response-driven wide-area broadband oscillation multi-level control method according to claim 4, characterized in that: The collector is judged to have a broadband oscillation alarm event, and when at least one of the following action conditions is met, the collector is judged to have a broadband oscillation: 1) Action condition 1: Broadband oscillation power amplitude of the collector , and the number of oscillation cycles of the collector wire or the oscillation duration of the collector ;in, is the broadband oscillation power action setting of the collector line, For the The action value of the oscillation frequency in a control cycle is For the The oscillation level difference delay setting in each control round is: , is the number of buses; 2) Action condition 2: Amplitude of wide-band oscillating current of the collector ,at the same time or ;in, It is the broadband oscillating current action setting value of the collector; Among them, the collector that has been decoupled in the previous control round is not used as a broadband oscillation monitoring object in the current control round.

6. The response-driven wide-area broadband oscillation multi-level control method according to claim 5, characterized in that: When a wide-band oscillation multi-level control device is configured as an execution station at the new energy station end, and a wide-band oscillation multi-level control device is configured as a master station at the AC system end to which multiple new energy stations are connected, in each control round, the execution station sends to the master station the sum of the capacities of the collector lines decoupled in the wide-band oscillation decoupling control of the execution collector lines.

7. The response-driven wide-area broadband oscillation multi-level control method according to claim 1, characterized in that: When the total number of control rounds of the transmission line broadband oscillation selective cutting control is determined by the user, the transmission line broadband oscillation selective cutting control is performed to cut off the collector line of the set capacity determined by the user; When the total number of control rounds of the broadband oscillation selective cutting control of the transmission line is set according to the number of bus sections in the new energy station, the broadband oscillation selective cutting control of the transmission line is executed to cut off all collectors under the set bus; In each control round, all the transmission lines have the same broadband oscillation action setting, broadband oscillation alarm setting, oscillation alarm delay threshold, and oscillation frequency alarm threshold. In each control round, the oscillation level difference delay constants of all transmission lines are set differently, the difference between two adjacent oscillation level difference delay constants is the same, the oscillation frequency action constants are set differently, and the difference between two adjacent oscillation frequency action constants is the same.

8. The response-driven wide-area broadband oscillation multi-level control method according to claim 7, characterized in that: The busbar that meets any of the following conditions is the set busbar: 1) Calculate the sum of the amplitudes of the broadband oscillation power of the collectors on each bus section, and the bus corresponding to the maximum amplitude sum is taken as the set bus; 2) Calculate the amplitude ratio of the broadband oscillation power of all collectors, and take the bus where the collector with the largest amplitude ratio is located as the set bus.

9. The response-driven wide-area broadband oscillation multi-level control method according to claim 8, characterized in that: In each control round, all transmission lines are monitored for wide-band oscillation, including determining whether a wide-band oscillation alarm event occurs on the transmission line; When a transmission line meets at least one of the following alarm conditions, it is determined that a broadband oscillation alarm event occurs on the transmission line: 1) Alarm condition 1: Broadband oscillation power amplitude of the transmission line , while the oscillation frequency of the output line Or the oscillation level delay of the transmission line ;in, It is the broadband oscillation power alarm setting value of the transmission line. The oscillation frequency alarm threshold of the transmission line. It is the oscillation alarm delay threshold of the sending line; 2) Alarm condition 2: Amplitude of broadband oscillating current on the outgoing line ,at the same time or ;in, It is the wide-frequency oscillating current alarm setting of the transmission line.

10. The response-driven wide-area broadband oscillation multi-level control method according to claim 9, characterized in that: The broadband oscillation alarm event is determined to occur on the outgoing line, and when the outgoing line satisfies at least one of the following action conditions, the broadband oscillation is determined to occur on the outgoing line: 1) Action condition 1: Broadband oscillation power amplitude of the transmission line , while the oscillation frequency of the output line Or the oscillation level delay of the transmission line ;in, It is the broadband oscillation power action setting value of the transmission line. For the The action value of the oscillation frequency in a control cycle is For the The oscillation level difference delay setting in each control round is: , is the number of buses; 2) Action condition 2: Amplitude of broadband oscillating current of the outgoing line ,at the same time or ;in, It is the action setting value of the broadband oscillating current of the transmission line.

11. The response-driven wide-area broadband oscillation multi-level control method according to claim 10, characterized in that: When a broadband oscillation multi-level control device is configured as an execution station at the new energy station end, and a broadband oscillation multi-level control device is configured as a master station at the AC system end to which multiple new energy stations are connected, the execution station sends the broadband oscillation information of all transmission lines, the remaining number of control rounds and the sum of the capacities of the collectors that have not been cut off in the new energy station to the master station; when the master station determines that a broadband oscillation occurs in a transmission line, it sends an instruction for the transmission line oscillation selection control to the execution station; after receiving the instruction, the execution station cuts off the collector of the set capacity determined by the user or all the collectors under the set bus, and sends the sum of the capacities of the collectors cut off in the broadband oscillation selection control of the transmission line to the master station.

12. The response-driven wide-area broadband oscillation multi-level control method according to claim 11, characterized in that: When only a broadband oscillation multi-level control device is configured at the end of the new energy station as an execution station, the new energy stations are grouped according to the short-circuit ratio of the new energy stations, and the total number of control rounds of broadband oscillation control between the new energy stations is set according to the number of groups; when it is determined according to the broadband oscillation information of the transmission line that broadband oscillation occurs simultaneously in multiple transmission lines, the execution station executes broadband oscillation control between the new energy stations, and selects and cuts the collector line of the set capacity determined by the user in control rounds, and when the sum of the capacities of the collector lines cut off by the new energy station is greater than the maximum total amount of cutting of the regional power grid set by the user in an oscillation event, the execution station locks all broadband oscillation control functions of the new energy station; The grouping includes: calculating the short-circuit ratio of multiple renewable energy stations, and sorting each renewable energy station in the order of the short-circuit ratio of multiple renewable energy stations from small to large; setting the number of groups , and then divide the total capacity of all new energy stations in the regional power grid into Group to determine the capacity benchmark value of each group; select stations in order according to the order of new energy stations. When the capacity of the selected stations is equivalent to the capacity benchmark value of each group, the selected stations will form a group. After all the stations are grouped, the number of groups is obtained. .

13. The response-driven wide-area broadband oscillation multi-level control method according to claim 12, characterized in that: In each control round, the broadband oscillation action constants of all transmission lines are set to the same value, and the action delays are set to different values. The new energy stations in the same group have the same action delays; the action delays satisfy the following relationship: In the formula, For the The action delay in each control round, is the baseline delay, .

14. The response-driven wide-area broadband oscillation multi-level control method according to claim 12, characterized in that: In each control round, the busbars in the new energy station group are selected according to the set capacity determined by the user, so that the sum of the capacity of the selected busbars is not greater than the maximum power cut of the new energy station in an oscillation event; wherein the maximum power cut of the new energy station in an oscillation event satisfies the following relationship: In the formula, is the maximum amount of power cuts at the renewable energy station during an oscillation event, The maximum output of new energy stations. It is the sum of the maximum output of all new energy stations with execution stations in the regional power grid. The maximum total amount of power cuts in the regional power grid set by the user in an oscillation event; And, in the In the control rounds, if from 1 to The sum of the actual power cuts of the renewable energy stations in each control round is greater than the maximum power cuts of the regional power grid set by the user in one oscillation event. , then all broadband oscillation control functions of the new energy station will be locked.

15. The response-driven wide-area broadband oscillation multi-level control method according to claim 14, characterized in that: After selecting the busbars within the new energy station group, calculate the sum of the amplitudes of the broadband oscillation power of the un-decoupled collectors on each section of the selected busbar, or calculate the amplitude ratio of the broadband oscillation power of all un-decoupled collectors; wherein, the ratio of the amplitude of the broadband oscillation power to the amplitude of the fundamental frequency power is taken as the amplitude ratio; sort the collectors in order of the sum of the amplitudes or the amplitude ratio from large to small; based on the sorting, select the collectors from each section of the selected busbar in turn, and when the sum of the capacities of the selected collectors is not less than the set capacity and not greater than the maximum cutting capacity of the new energy station in an oscillation event, the selected collectors are collectors of the set capacity and are cut off.

16. The response driven wide area broadband oscillation multi-level control method according to claim 12, characterized in that: When a broadband oscillation multi-level control device is configured as an execution station at the new energy station end, and a broadband oscillation multi-level control device is configured as a master station at the AC system end to which multiple new energy stations are connected, when it is determined that broadband oscillation occurs simultaneously in multiple transmission lines based on the broadband oscillation information of the transmission lines, the master station executes broadband oscillation control between new energy stations, selects the transmission line according to the set oscillation characteristics determined by the user, and sends an instruction for the transmission line oscillation selection control to the execution station corresponding to the selected transmission line. After receiving the instruction, the execution station cuts off the collector line of the set capacity determined by the user or all collector lines under the set bus, and sends the capacity and the value of the cut-off collector line to the master station.

17. The response driven wide-area broadband oscillation multi-level control method according to claim 16, characterized in that: The set oscillation characteristics determined by the user include: short-circuit ratio of new energy multi-stations, real-time equivalent impedance of transmission lines, oscillation modal power flow direction, oscillation power amplitude, oscillation current amplitude, and oscillation power amplitude ratio; the set oscillation characteristics are open to users for selection and adjustment.

18. The response driven wide area broadband oscillation multi-level control method according to claim 16, characterized in that: The master station calculates the total removal capacity of the new energy station based on the sum of the capacities of the collector lines decoupled in the collector line broadband oscillation decoupling control sent from the execution station and the sum of the capacities of the collector lines removed in the transmission line broadband oscillation selective cutting control; when the total removal capacity is greater than the maximum total amount of cutting of the regional power grid in an oscillation event set by the user, all broadband oscillation control functions of the new energy station are locked.

19. The response driven wide area broadband oscillation multi-level control method according to claim 16, characterized in that: The action delay between each control round is a set value preset in the master station, and the set value is developed for grid users to set.

20. A response-driven wide-area broadband oscillation multi-level control system, used to implement the response-driven wide-area broadband oscillation multi-level control method according to any one of claims 1 to 19, characterized in that: include: Only configure the execution station at the new energy station end; Execution station, used to obtain monitoring data of new energy stations to determine broadband oscillation information of collector and transmission lines; The total number of control rounds of broadband oscillation decoupling control of collector lines and broadband oscillation selective cutting control of transmission lines is set; in each control round, the execution station performs broadband oscillation monitoring on all collector lines that have not been decoupled and all transmission lines; when it is determined that broadband oscillation occurs in the collector line based on the broadband oscillation information of the collector line, the broadband oscillation decoupling control of the collector line is executed to decouple the collector line of the set capacity or all the collector lines on the bus where the collector line with broadband oscillation occurs is located; or, when it is determined that broadband oscillation occurs in a transmission line based on the broadband oscillation information of the transmission line, the broadband oscillation selective cutting control of the transmission line is executed to cut off the collector line of the set capacity Or set all the collectors under the bus; group the new energy stations according to their short-circuit ratios, and set the total number of control rounds of broadband oscillation control between the new energy stations according to the number of groups; when it is determined according to the broadband oscillation information of the transmission lines that broadband oscillation occurs simultaneously in multiple transmission lines, the execution station executes broadband oscillation control between the new energy stations, and selects and cuts the collectors of the set capacity determined by the user in control rounds, and when the sum of the capacities of the collectors cut off by the new energy station is greater than the maximum total amount of machine cutting of the regional power grid set by the user in an oscillation event, the execution station locks all broadband oscillation control functions of the new energy station.

21. A response-driven wide-area broadband oscillation multi-level control system, used to implement the response-driven wide-area broadband oscillation multi-level control method according to any one of claims 1 to 19, characterized in that: include: Configure the execution station at the new energy station end and configure the master station at the AC system end connected to multiple new energy stations; Each execution station communicates with the master station, and there is no communication between execution stations; Execution station, used to obtain monitoring data of new energy stations to determine broadband oscillation information of collector and transmission lines; The execution station monitors the broadband oscillation of all undecoupled collectors; the execution station sends the broadband oscillation information of all outgoing lines, the remaining number of control rounds and the sum of the capacities of the collectors that have not been cut off in the new energy station to the main station; when it is determined that the collector has broadband oscillation according to the broadband oscillation information of the collector, the collector broadband oscillation decoupling control is executed to decouple the collectors of the set capacity or all the collectors on the bus where the collectors with broadband oscillation are located; and the sum of the capacities of the collectors decoupled in the execution of the collector broadband oscillation decoupling control is sent to the main station; The master station is used to perform broadband oscillation monitoring on all transmission lines. When it is determined that broadband oscillation occurs in one transmission line according to the broadband oscillation information of the transmission line, it sends a transmission line oscillation selection and control instruction to the execution station. After receiving the instruction, the execution station cuts off the collector line of the set capacity determined by the user or all the collector lines under the set bus, and sends the capacity and the amount of the collector line cut off in the broadband oscillation selection and control of the transmission line to the master station; when it is determined that broadband oscillation occurs simultaneously in multiple transmission lines according to the broadband oscillation information of the transmission line, the master station executes broadband oscillation control between new energy stations, selects the transmission line according to the set oscillation characteristics determined by the user, and sends the instructions to all the transmission lines. The execution station corresponding to the selected outgoing line sends an instruction for the oscillation selective cutting control of the outgoing line. After receiving the instruction, the execution station cuts off the collector with the set capacity determined by the user or all the collectors under the set bus, and sends the capacity and amount of the cut-off collectors to the main station. The total cutting capacity of the new energy station is calculated based on the capacity and amount of the collectors decoupled in the execution collector broadband oscillation decoupling control sent by the execution station and the capacity and amount of the collectors cut off in the execution outgoing line broadband oscillation selective cutting control. When the total cutting capacity is greater than the maximum total cutting amount of the regional power grid set by the user in an oscillation event, all broadband oscillation control functions of the new energy station are locked.

22. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 19.

23. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 19 are implemented.

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