Response-driven wide-area broadband oscillation multi-level control method and system

Abstract

The invention discloses a response-driven wide-area broadband oscillation multi-level control method and a response-driven wide-area broadband oscillation multi-level control system. The broadband oscillation information of a current collection wire and a sending-out wire is determined; in each control round, carrying out broadband oscillation monitoring on all unsplit current collection lines and all outgoing lines; when it is judged that broadband oscillation occurs in the current collector wire according to the broadband oscillation information of the current collector wire, current collector wire broadband oscillation splitting control is executed to split the current collector wire with the set capacity or all current collector wires on a bus where the current collector wire with broadband oscillation occurs; or, when it is judged that broadband oscillation happens to one loop of outgoing line according to the broadband oscillation information of the outgoing line, outgoing line broadband oscillation selecting and cutting control is executed to cut off the current collection line with the set capacity or all the current collection lines under the set bus; and when it is judged that broadband oscillation occurs at the same time according to the broadband oscillation information of the outgoing lines, broadband oscillation control between new energy field stations is executed to cut off the current collection lines with set capacity or the outgoing lines with set oscillation characteristics, and chain accidents caused by over-switching of new energy units are avoided.

Description

Technical Field

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

[0002] Under the background of dual carbon, the number and scale of grid-connected renewable energy stations have increased significantly, and the dual-high characteristics of the power system have become more and more obvious. Large-capacity renewable energy stations are connected to the grid through a single-circuit line. Although the short-circuit capacity of the system grid connection point is sufficient and the short-circuit ratio meets the strong system indication, the short-circuit ratio of multiple stations on the low-voltage side of the renewable 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 renewable energy stations are connected to the same AC station.

[0003] In the prior art, the traditional broadband oscillation control method is to directly disconnect a single collector line when the collector line oscillation is detected. However, the capacity removed by disconnecting a single collector line is too small, and the oscillation cannot be eliminated in time, which will cause the accident to expand. In addition, due to the large number of collector lines, it is necessary to set an action constant for each collector line when disconnecting the collector line individually, resulting in complex relay protection configuration and high investment. When the transmission line oscillation is detected, the entire new energy station is completely disconnected. Although it can quickly eliminate the source of oscillation and prevent the accident from further spreading and expanding, when broadband oscillation occurs at multiple new energy stations at the same time, it is easy to cause multiple stations to be disconnected at the same time. The capacity removed is too large, which not only causes high economic losses, but also more seriously, it will cause a large power shock to the main grid, causing frequency stability accidents. Therefore, how to respond to the drive of electrical quantities in real time to quickly locate the broadband oscillation source, and implement broadband oscillation multi-level control to achieve refined removal of the oscillation source is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order 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 performs oscillation control in the order of collectors, transmission lines and stations, with each section of the bus in the station as the control unit. When the collector oscillates, the oscillating collector and all the collectors under the same bus as the oscillating collector are de-energized, and the capacity to be removed is reasonably controlled on the basis of rapid fault location, without the need to set an action constant for each collector. When a single transmission line oscillates, all the collectors under the selected bus are removed according to a preset principle, and when multiple transmission lines oscillate, the bus with a set capacity in the corresponding station is removed, thereby improving the speed of removing the oscillation source and avoiding economic losses and safety hazards caused by the removal of the entire station.

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

[0006] The present invention proposes a response-driven wide-area broadband oscillation multi-level control method, comprising: Obtain monitoring data from 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, broadband oscillation monitoring is performed on all collector lines that have not been decoupling 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 decoupling 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 all the collector lines under the set bus; 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.

[0007] Preferably, the monitoring data of the new energy station includes: 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.

[0008] When only the broadband oscillation multi-level control device is configured as the 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 and the transmission line; in each control round, the execution station performs broadband oscillation monitoring on all the collectors and all the transmission lines that have not been decoupled; When a broadband oscillation multi-level control device is configured at the new energy station end as an execution station, and a broadband oscillation multi-level control device is configured at the AC system end to which multiple new energy stations are connected as a master station, the execution station obtains the monitoring data of the new energy station to determine the broadband oscillation information of the collecting lines and the transmission lines; the execution station performs broadband oscillation monitoring on all collecting lines that have not been decoupled; the execution station sends the broadband oscillation information of all transmission lines to the master station, and the master station performs broadband oscillation monitoring on all transmission lines.

[0009] Preferably, performing the collector line broadband oscillation decoupling control to decoupling the collector line of set capacity and performing the transmission line broadband oscillation selective cutting control to cut off the collector line of set capacity comprises: Calculate the sum of the amplitudes of the broadband oscillation power of the undecoupled collector wires on each section of the bus, or calculate the amplitude ratio of the broadband oscillation power of all undecoupled collector wires; 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 descending order of the sum of amplitudes or amplitude ratios; Based on the ranking, the collectors are selected in sequence, and when the sum of the capacities of the selected collectors is not less than the set capacity determined by the user, the selected collectors are de-listed or cut off.

[0010] Preferably, 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.

[0011] Preferably, performing broadband oscillation monitoring on all undecoupled collector lines in each control round includes determining whether a broadband oscillation alarm event occurs on the collector line; 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 setting values ​​of all collector lines are set to the same, the broadband oscillation action setting values ​​of all transmission lines are set to the same, the oscillation level difference delay setting values ​​are set to different, and the difference between two adjacent oscillation level difference delay setting values ​​is the same; Preferably, when it is determined that a broadband oscillation alarm event occurs in the collector line and at least one of the following action conditions is met, it is determined that broadband oscillation occurs in the collector line: 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.

[0012] Preferably, 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. In each control round, the execution station sends to the master station the sum of the capacities of the collector lines decoupled in the broadband oscillation decoupling control of the execution collector lines.

[0013] Preferably, 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.

[0014] Preferably, the busbar that satisfies 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.

[0015] Preferably, performing broadband oscillation monitoring on all transmission lines in each control round includes determining whether a broadband 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.

[0016] Preferably, when it is determined that a broadband oscillation alarm event occurs in the outgoing line, and one outgoing line satisfies at least one of the following action conditions, it is determined that a broadband oscillation occurs in 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.

[0017] Preferably, 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 execution of the broadband oscillation selection control of the transmission line to the master station.

[0018] Preferably, 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 in an oscillation event set by the user, 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. .

[0019] Preferably, 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, and the new energy stations in the same group have the same action delay; the action delay satisfies the following relationship:

[0020] In the formula, For the The action delay in each control round, is the baseline delay, .

[0021] Preferably, 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 capacities of the selected busbars is not greater than the maximum shutdown amount of the new energy station in an oscillation event; wherein the maximum shutdown amount of the new energy station in an oscillation event satisfies the following relationship:

[0022] 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 an oscillation event. , then all broadband oscillation control functions of the new energy station will be locked.

[0023] Preferably, after selecting the bus within the new energy station group, the sum of the amplitudes of the broadband oscillation power of the undecoupled collectors on each section of the selected bus is calculated, or the amplitude ratio of the broadband oscillation power of all undecoupled collectors is calculated; 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; the collectors are sorted in order of the sum of the amplitudes or the amplitude ratio from large to small; based on the sorting, the collectors are selected from each section of the selected bus 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.

[0024] Preferably, 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 commonly 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.

[0025] Preferably, the set oscillation characteristics determined by the user include: short-circuit ratio of new energy multi-station, real-time equivalent impedance of transmission line, oscillation modal power flow direction, oscillation power amplitude, oscillation current amplitude, oscillation power amplitude ratio; the set oscillation characteristics are open to users for selection and adjustment.

[0026] Preferably, the master station calculates the total cutting 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 and the sum of the capacities of the collector lines cut off in the transmission line broadband oscillation selective cutting control sent from the execution station; 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.

[0027] Preferably, the action delay between each control round is a fixed value preset in the master station, and the fixed value is provided to the grid user for setting.

[0028] The present invention proposes a response-driven wide-area broadband oscillation multi-level control system, comprising: When the execution station is configured only at the new energy station end, the execution station is used to obtain the monitoring data of the new energy station to determine the broadband oscillation information of the collector and the transmission line; set the total number of control rounds of the collector broadband oscillation decoupling control and the transmission line broadband oscillation selection control; in each control round, the execution station performs broadband oscillation monitoring on all undecoupled collectors and all transmission lines; 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 collector of the set capacity or all the collectors on the bus where the collector with broadband oscillation is located; or, when it is determined that a transmission line has broadband oscillation according to the broadband oscillation information of the transmission line , execute the broadband oscillation selection control of the transmission line to cut off the collector line of the set capacity or all the collector lines under the set bus; group the new energy stations according to the short-circuit ratio of the new energy stations, 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 line that broadband oscillation occurs simultaneously in multiple transmission lines, the execution station executes the 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 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.

[0029] The present invention also proposes another response-driven wide-area broadband oscillation multi-level control system, comprising: Configure an execution station at the new energy station end, and configure a master station at the AC system end to which multiple new energy stations are connected; each execution station communicates with the master station, and there is no communication between execution stations; The execution station is used to obtain the monitoring data of the new energy station to determine the broadband oscillation information of the collector and the transmission line; the execution station performs broadband oscillation monitoring on all the collectors that have not been decoupled; the execution station sends the broadband oscillation information of all the 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 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 collector of the set capacity or all the collectors on the bus where the collector with broadband oscillation is 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.

[0030] The present invention is also a terminal, comprising 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.

[0031] The present invention is also a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0032] The beneficial effects of the present invention are that, compared with the prior art, at least the present invention proposes a wide-area broadband oscillation multi-level control, which utilizes wide-area measurement and communication technology to monitor, analyze and evaluate the real-time operating status of multiple new energy stations in a regional power grid in real time. When the broadband oscillation action criteria are met, millisecond-level collaborative control measures of multiple new energy station-end monitoring devices in the regional power grid are triggered to achieve rapid positioning and emergency blocking of broadband oscillations.

[0033] Aiming at the demand for rapid removal of broadband oscillations of multiple new energy stations in the regional power grid and the problem of easily over-cutting new energy units, the present invention proposes three-level control methods of broadband oscillation decoupling of collector lines, broadband oscillation selection of transmission lines, and broadband oscillation control between stations, with reference to correction control combined with electrical quantity response and multi-round approximation principles. First, the three-level control methods all select the collector bus as the control unit, and lock the possible broadband oscillation source (including SVG and photovoltaic inverter collector unit) as quickly as possible through the principle of maximum oscillation power or maximum amplitude ratio. Secondly, the three-level methods all adopt multi-round removal. Each round only removes a section of the collection bus, while ensuring the rapid removal of the oscillation source, and removing the new energy units with the smallest granularity possible, which can avoid the phenomenon that the traditional broadband oscillation control sequentially removes dozens of collector setting settings and the control logic is complex and difficult to maintain, and can also avoid the removal of the entire station causing a large power impact on the main grid. Thirdly, the broadband oscillation control between stations proposed in the present invention has high scalability, and newly connected new energy stations can participate in the broadband oscillation control between new energy stations in the regional power grid by setting them into the existing broadband oscillation control round between stations.

[0034] The method provided by the present invention can improve the reliability and precision of existing broadband oscillation control, and can avoid chain accidents caused by over-cutting new energy units. Based on real-time electrical quantity response drive, the broadband oscillation source can be quickly located, and through multi-level judgment and multi-round cutting, comprehensive monitoring, control and refined cutting of new energy collection line-busbar-transmission line can be achieved, reducing the power impact on the power grid and improving the safe and stable operation margin of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of a response-driven wide-area broadband oscillation multi-level control method proposed by the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0037] The present invention proposes a response-driven wide-area broadband oscillation multi-level control method, which is suitable for scenarios where multiple new energy sites are connected to the same AC system and the short-circuit ratio of multiple sites on the voltage-boosting to low-voltage side of the new energy power generation unit is generally lower than 2.0. The control method proposed in the present invention is implemented by a broadband oscillation multi-level control device or system deployed at the new energy site.

[0038] like Figure 1 As shown, the method includes: Step 1: Obtain monitoring data from new energy stations to determine broadband oscillation information of collectors and transmission lines.

[0039] Specifically, the monitoring data of the new energy station includes but is not limited to: the voltage, current, frequency and power of the transmission line, the main transformer in the station, the collection line and the SVG; the broadband oscillation information includes but is not limited to: broadband oscillation current, broadband oscillation power, oscillation frequency number and oscillation duration; In the embodiment, a broadband oscillation multi-level control device is deployed at the new energy station end, and the broadband oscillation multi-level control device is used to monitor in real time the voltage, current, frequency and power information of components such as the new energy station transmission line, the main transformer in the station, the collector line and the SVG feeder line; and calculate in real time the broadband oscillation current and broadband oscillation power of the collector line, SVG feeder line and the transmission line.

[0040] When only the broadband oscillation multi-level control device is configured as the 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 and the transmission line; in each control round, the execution station performs broadband oscillation monitoring on all the collectors and all the transmission lines that have not been decoupled; When a broadband oscillation multi-level control device is configured at the new energy station end as an execution station, and a broadband oscillation multi-level control device is configured at the AC system end to which multiple new energy stations are connected as a master station, the execution station obtains the monitoring data of the new energy station to determine the broadband oscillation information of the collecting lines and the transmission lines; the execution station performs broadband oscillation monitoring on all collecting lines that have not been decoupled; the execution station sends the broadband oscillation information of all transmission lines to the master station, and the master station performs broadband oscillation monitoring on all transmission lines.

[0041] Step 2, setting the total number of control rounds of broadband oscillation de-coupling control of collector lines and broadband oscillation selective cutting control of transmission lines; in each control round, performing broadband oscillation monitoring on all collector lines that have not been de-coupling 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, executing the broadband oscillation de-coupling control of the collector line to de-coupling 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, executing the broadband oscillation selective cutting control of the transmission line to cut off the collector line of the set capacity or all the collector lines under the set bus.

[0042] In the embodiment, according to the broadband oscillation control regulations of the power grid in the area where the new energy station is connected to the grid, the broadband oscillation current and / or broadband oscillation power is selected as the broadband oscillation information; if it is determined that the broadband oscillation current or the broadband oscillation power meets the action set value, the broadband oscillation multi-level control device cuts off the new energy unit according to the three-level control method; in the existing broadband oscillation control technology, there is no monitoring and corresponding control strategy for the broadband oscillation of the collector line, and the entire new energy station is directly cut off when the broadband oscillation occurs in the transmission line; in view of the defects of the prior art, the present invention proposes a three-level control method, including: broadband oscillation decoupling control of the collector line, broadband oscillation selection control of the transmission line, and control between new energy stations. Broadband oscillation control; the voltage levels and scopes of the control objects of the three hierarchical control methods are different. The broadband oscillation decoupling control of the collector line is aimed at the collector line of the low voltage level. The number of collector lines in a new energy power station is usually 40 or less; the broadband oscillation selection control of the transmission line is aimed at the transmission line of the new energy station of the high voltage level. A new energy station usually has only one or two transmission lines; the broadband oscillation control between new energy stations realizes the control between multiple new energy stations in the regional power grid; therefore, in the embodiment, when performing the broadband oscillation multi-level control of new energy multi-stations, the order of broadband oscillation decoupling control of the collector line → broadband oscillation selection control of the transmission line → broadband oscillation control between new energy stations is executed. Traditional broadband oscillation control generally does not collect or judge the collector line, but only judges the transmission line. If the transmission line meets the conditions, the entire station is cut off. The three hierarchical controls of collector line decoupling, transmission line selection, and station-to-station control proposed in the present invention are all multiple rounds of judgment and control.

[0043] Executing the collector line wide-band oscillation decoupling control to decoupling the collector line of set capacity and executing the transmission line wide-band oscillation selective cutting control to cut off the collector line of set capacity, including: Calculate the sum of the amplitudes of the broadband oscillation power of the undecoupled collector wires on each section of the bus, or calculate the amplitude ratio of the broadband oscillation power of all undecoupled collector wires; 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 descending order of the sum of amplitudes or amplitude ratios; Based on the ranking, the collectors are selected in sequence, and when the sum of the capacities of the selected collectors is not less than the set capacity determined by the user, the selected collectors are de-listed or cut off.

[0044] It is worth noting that the method proposed in the embodiment of determining the collector line of set capacity by using the maximum sum of amplitudes or the maximum amplitude ratio is a non-restrictive and preferred choice. Technical personnel in this field can adopt different methods to determine the collector line of set capacity to be de-coupled or removed according to actual engineering conditions and scheduling requirements.

[0045] Specifically, step 2 includes: Step 2.1, 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 executed 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 setting value of all collectors is set to be the same, the broadband oscillation alarm setting 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.

[0046] In the embodiment, there are a total of New energy stations , ,……, ,……, ; A new energy station has a total of Return wire , ,……, , SVG feeder and Return outgoing line, respectively connected to Section bus , ,……, The number of collectors and SVG feeders on each bus section is basically the same, and the SVG feeders are used as collectors; In the new energy station, according to the number of bus sections Set the total number of control rounds for the collector line broadband oscillation decoupling control and the transmission line broadband oscillation selection control, each control round corresponds to a section of the busbar; Optionally, the total number of control rounds is set according to the number of bus sections or by the grid user. The decoupling or removal capacity of each control round is relatively limited, and generally all collectors under a section of bus are selected to determine the decoupling or removal capacity of each control round, or a fixed capacity set by the grid user according to the actual grid conditions; and the total number of control rounds and the decoupling or removal capacity of each control round are irrelevant to whether a master station is set.

[0047] In the new energy station, in each control round, the broadband oscillation action setting values ​​of all collector lines are set to the same, the broadband oscillation action setting values ​​of all transmission lines are set to the same, the oscillation level difference delay setting values ​​are set to different, and the difference between two adjacent oscillation level difference delay setting values ​​is the same; In the new energy station, in each control round, the broadband oscillation alarm constants of all collecting lines are set to the same, the broadband oscillation alarm constants of all sending lines are set to the same, the oscillation alarm delay thresholds of all collecting lines are set to the same, and the oscillation alarm delay thresholds of all sending lines are set to the same.

[0048] Specifically, in each control round, the broadband oscillation action setting values ​​of each collector line are set to be the same, and the broadband oscillation action setting values ​​of the collector line include: broadband oscillation power action setting value , Wide-frequency oscillating current action setting ; In each control round, the broadband oscillation action setting value of each outgoing line is set the same. The broadband oscillation action setting value of the outgoing line includes: broadband oscillation power action setting value , Wide-frequency oscillating current action setting ; Specifically, in each control round, the broadband oscillation alarm setting of each collector line is set to be the same, and the broadband oscillation alarm setting is less than the broadband oscillation action setting. The broadband oscillation alarm setting of the collector line includes: broadband oscillation power alarm setting , Wide-frequency oscillation current alarm setting ; In each control round, the broadband oscillation alarm setting of each outgoing line is set to the same value, and the broadband oscillation alarm setting is less than the broadband oscillation action setting. The broadband oscillation alarm setting of the outgoing line includes: broadband oscillation power alarm setting , Wide-frequency oscillation current alarm setting ; In the existing collector line oscillation control technology, when the collector line oscillates, the oscillating collector line is disconnected. Therefore, the broadband oscillation action constant and alarm constant of each collector line are set differently to locate the oscillating collector line to perform the disconnection operation. However, there are many collector lines, and such parameter setting principle leads to complex configuration of relay protection devices. The present invention uses each section of bus as a control unit, combined with the electrical characteristics of each collector line with basically the same capacity, and each control round corresponds to a section of bus. Therefore, the broadband oscillation action constant and broadband oscillation alarm constant of each collector line in each control round are set the same, so that the control standards of each collector line are unified, the relay protection equipment configuration is the same, and the maintainability of the equipment is improved. Moreover, the present invention uses each section of the busbar as a control unit, and when the outgoing line oscillates, the busbar is cut off according to the maximum amplitude principle or the maximum amplitude ratio principle. Therefore, on the basis that the broadband oscillation action constant value and the broadband oscillation alarm constant value of each collector line in each control round are set the same, the broadband oscillation action constant value and the broadband oscillation alarm constant value of each outgoing line in each control round are also set the same, so that the control standard of each outgoing line is unified, the relay protection equipment configuration is the same, and the maintainability of the equipment is improved; Combining the above-mentioned principles for setting fixed values ​​will facilitate the standardized construction of new energy stations and unified management of equipment.

[0049] In order to implement the busbar disconnection or selective switching strategy section by section according to the control round, the oscillation level difference delay setting is set differently in each control round, which are respectively , ,……, ,……, , the difference between the two adjacent oscillation level difference delay setting values ​​is the same, In each control round, the oscillation level difference delay setting values ​​of all collectors and all transmission lines are the same. ; In each control round, the oscillation alarm delay threshold of the collector is set to the same The oscillation alarm delay threshold of the transmission line is set to the same as ; The oscillation level difference delay constant is greater than the oscillation alarm delay threshold.

[0050] In the embodiment, the oscillation level difference delay setting value in the first control round is 20s, and the oscillation alarm delay threshold is 15s; the oscillation level difference delay setting value in the second control round is 40s, and the oscillation alarm delay threshold is 35s; the oscillation level difference delay setting value in the third control round is 60s, and the oscillation alarm delay threshold is 55s; when multiple collectors simultaneously have broadband oscillations, if the oscillating collectors are in different bus sections, different oscillation level difference delay setting values ​​are set in each control round to implement time-sharing decoupling of different bus sections; if the oscillating collectors are in the same bus section, since the same bus section corresponds to the same control round, all oscillating collectors can be removed by decoupling this bus section in the same control round, and oscillation suppression can be quickly achieved. Similarly, by setting different broadband oscillation alarm delay thresholds in each control round, time-sharing alarms for collector oscillations on different bus sections and simultaneous alarms for collector oscillations on the same bus section can be implemented.

[0051] Corresponding to the oscillation level difference delay setting in each control round, different oscillation frequency action setting values ​​are set in each control round, which are respectively , ,……, ,……, , the difference between the action values ​​of two adjacent oscillation cycles is the same, In each control round, the oscillation frequency of all collectors and all outgoing lines has the same action value. ; In each control round, the threshold of the collector oscillation frequency alarm is set to the same value , the oscillation frequency alarm threshold of the transmission line is set to the same as ; The oscillation frequency action setting value is greater than the oscillation frequency alarm threshold.

[0052] In the oscillation execution strategy, the oscillation level difference delay constant corresponds to the oscillation frequency action constant, and the oscillation alarm delay threshold corresponds to the oscillation frequency alarm threshold. In the embodiment, according to the broadband oscillation control regulations of the power grid in the area where the new energy station is connected to the grid, the oscillation level difference delay constant and / or the oscillation frequency action constant are selected for judgment, and the oscillation alarm delay threshold and / or the oscillation frequency alarm threshold are selected for alarm.

[0053] Each control round proposed in the present invention corresponds to a section of bus, and each control round is set with a different oscillation level difference delay constant (oscillation frequency action constant), so that there is a time interval between the decoupling of different buses, which provides processing time for the coordinated management of the entire station, provides an opportunity for the oscillation self-recovery of the entire station after cutting off part of the bus, and avoids instability and losses caused by large-scale simultaneous power outages; and each control round is set with the same oscillation alarm delay threshold (oscillation frequency threshold) and broadband oscillation alarm constant, so as to generate alarm events of each control round with the same standard, and the timely occurrence of alarm is conducive to the pre-positioning of the oscillation source, and provides sufficient preparation time for the oscillation deterioration of the entire station after cutting off part of the bus.

[0054] 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 setting values ​​of all collector lines are set to the same, the broadband oscillation action setting values ​​of all transmission lines are set to the same, the oscillation level difference delay setting values ​​are set to different, and the difference between two adjacent oscillation level difference delay setting values ​​is the same; 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.

[0055] In each control round, all the collectors that have not been decoupled are monitored for broadband oscillation. When it is determined that the collector has broadband oscillation based on the broadband oscillation information of the collector, all the collectors under the bus where the collector with broadband oscillation is located are decoupled. In the control of broadband oscillation decoupling of collectors, the functions of the master station and the master station are the same. If the collector meets the oscillation criteria, the fixed capacity collectors or all the collectors under a section of the bus (control unit) are decoupled according to the user's specifications. The number of rounds is determined by the user or by the number of bus sections. (The decoupling can be determined according to the maximum oscillation amplitude or amplitude ratio principle, both of which are determined by the user through the device setting); all collectors are calculated and judged independently. If the action setting is met, all the collectors under the bus where the collector is located are automatically decoupled, and the remaining collectors are judged next.

[0056] As the number and scale of new energy 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 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, expanding into a broadband oscillation multi-level control system for multiple new energy stations in the regional power grid, wherein each execution station in the control system communicates with the master station, but the execution stations do not communicate with each other; in the control strategy of the broadband oscillation multi-level control system for multiple new energy stations in the regional power grid, the broadband oscillation decoupling control strategy of the collector line remains unchanged, and each execution station executes according to step 3.1, that is, the control logic of the collector line decoupling has nothing to do with whether the master station is configured. When the master station is configured, in each control round, the execution station sends the decoupling collector line capacity and to the master station. However, the judgment logic of the transmission line selection, station-to-station coordination control, and maximum cutting capacity are different from those when there is no master station.

[0057] In the embodiment, the broadband oscillation decoupling control of the collector line is a multi-round control, and the number of control rounds is set according to the number of bus sections, so that all collector lines can be monitored; the collector lines that have been decoupled in the previous control round are not used as broadband oscillation monitoring objects in the current control round, which avoids repeated monitoring and is conducive to quickly locating the source of oscillation; moreover, through multiple control rounds, the broadband oscillation of the collector line is achieved, and the time-sharing decoupling of the bus where the oscillating collector line is located is judged and oscillated, so as to avoid the excessive capacity of the bus decoupled in one control round affecting the stability and economy of the system, and give the collector line time to recover from self-oscillation to avoid the expansion of accidents.

[0058] In an embodiment, a broadband oscillation multi-level control system is used to compare the broadband oscillation current of all collector lines calculated in real time with the broadband oscillation current action constant, and / or the broadband oscillation power of all collector lines calculated in real time with the broadband oscillation power action constant. When it is determined that the action conditions are met based on the comparison results, the busbar where the collector line experiencing broadband oscillation is located is de-energized.

[0059] In the embodiment, when there is an SVG feeder on the busbar, the SVG feeder is set as a collector and processed as a collector.

[0060] 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.

[0061] Step 2.2, 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.

[0062] Transmission line selection is to sort the oscillation characteristics of all busbars in the station and select the busbar to be cut according to the oscillation characteristics selected by the user. The oscillation characteristics of the busbar referenced when selecting the transmission line are generally the busbar with the largest oscillation power, the largest oscillation current, or the oscillation power amplitude ratio, i.e. the largest amplitude ratio. Transmission line selection is also to select and cut all collectors under this section of the busbar. Therefore, when the transmission line also has broadband oscillation, the transmission line broadband oscillation selection control is executed to cut off all collectors under the set busbar; among them, 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; 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.

[0063] It is worth noting that the method proposed in the embodiment to determine the set bus by using the maximum sum of amplitudes or the maximum amplitude ratio is a non-restrictive and preferred choice. Technical personnel in this field can use different methods to determine the set bus to be cut according to actual engineering conditions and scheduling requirements.

[0064] When the execution station determines that a broadband oscillation occurs in a transmission line based on the broadband oscillation information of the transmission line, all the collectors under the set bus are de-coupled; a broadband oscillation multi-level control device is configured at the new energy station end as an execution station, and a broadband oscillation multi-level control device is configured at the AC system end to which multiple new energy stations are connected as a master station. The execution station sends the broadband oscillation information of the transmission line, the remaining control rounds and the switchable capacity in the station to the master station in real time. When the master station determines that a broadband oscillation occurs in a transmission line based on the broadband oscillation information of the transmission line, the master station sends the transmission line oscillation selection control instruction to the execution station. After receiving the instruction, the execution station de-couples all the collectors under the set bus, and sends the capacity and the capacity of the cut collectors to the master station.

[0065] Specifically, in each control round, the broadband oscillation monitoring of all the transmission lines includes determining whether a broadband oscillation alarm event occurs in the transmission lines; 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.

[0066] Specifically, when a broadband oscillation alarm event occurs on a transmission line, and a transmission line satisfies at least one of the following action conditions, it is determined that a broadband oscillation occurs on a transmission 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.

[0067] In the embodiment, the broadband oscillation selective cutting control of the transmission line is a multi-round control, and the busbar that has been cut off in the previous control round is not used as a broadband oscillation monitoring object in the current control round. In addition, in the proposed broadband oscillation selective cutting control of the transmission line of the present invention, the rated power of the new energy station and the primary system wiring method are comprehensively considered to select the set busbar where the collector lines converge as the broadband oscillation selective cutting control object of the transmission line, instead of directly cutting off the entire station. The set busbar represents all the collector line positions with the largest sum of broadband oscillation power amplitudes or the largest amplitude ratio. It is not only the position where the broadband oscillation of the collector line is most serious, but also the source of the broadband oscillation of the transmission line. Therefore, cutting the set busbar is an effective measure to suppress the broadband oscillation of the transmission line.

[0068] In the embodiment, the broadband oscillating current and power action setting of the transmission line are set according to the electromagnetic transient simulation analysis conclusion of the regional power grid. If there is no simulation analysis conclusion to support, the setting can be made with reference to similar projects in the region (considering the voltage level of the transmission line of the new energy station and the installed capacity of the new energy station), or with reference to similar projects in other regions.

[0069] 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.

[0070] Step 3, when it is determined based on the broadband oscillation information of the transmission line that broadband oscillation occurs simultaneously in multiple transmission lines, broadband oscillation control between new energy stations is performed to cut off the collector line of the set capacity or the transmission line of the set oscillation characteristic.

[0071] Specifically, step 3 includes: Step 3.1, when only the broadband oscillation multi-level control device is configured as the execution station at the new energy station end, 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 the 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 in an oscillation event set by the user, 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. .

[0072] In the embodiment, based on the offline electromechanical simulation data of the power grid, a typical new energy generation operation mode of the power grid is selected to calculate the power consumption of each new energy station. Short circuit ratio , and sort each new energy station in order of short-circuit ratio from small to large; set 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. In the embodiment, The values ​​are 3, 4, 5, 6, 7, 8, 9, and 10. In the grouping method of multiple renewable energy stations proposed in the present invention, in actual engineering, the order of renewable energy stations is determined in advance according to the short-circuit ratio of multiple renewable energy stations, and the order is written in the form of a fixed value in the broadband oscillation multi-level control device and is open to users for setting. Such grouping realizes that the capacity of each group is equivalent, and ensures that the renewable energy stations with a small short-circuit ratio and a high risk of broadband oscillation are given priority in taking control measures in the previous control rounds.

[0073] Specifically, 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:

[0074] In the formula, For the The action delay in each control round, is the baseline delay, .

[0075] When multiple renewable energy transmission lines in a region meet the oscillation conditions at the same time, in the absence of a master station, the renewable energy 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, while the groups have the same action delay, different groups of renewable energy stations can be switched off in different time periods to avoid large-scale power outages in the regional power grid; When a broadband oscillation multi-level control device is configured as an execution station at the renewable 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 renewable energy stations are connected, the action delay between each control round is a fixed value preset in the master station, and the fixed value is developed for grid users to set; In the embodiment, when broadband oscillations occur simultaneously in multiple outgoing transmission lines, the master station selects and cuts the station according to the oscillation characteristics of the outgoing transmission lines of each station at the time of oscillation, waits for a fixed delay, and then judges the second round, and still selects and cuts the station according to the oscillation characteristics of the outgoing transmission lines of each station. The delay between each control round and the total number of judgment rounds can be opened to the user for adjustment through the fixed value on the master station side.

[0076] 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:

[0077] 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.

[0078] In the embodiment, each station-end device sets the maximum total amount of power cuts in the regional power grid during an oscillation event. Openness is determined by the user; The maximum amount of power cuts for each renewable energy station in an oscillation event is determined by the user based on comprehensive adjustments based on economic and safety factors and the maximum amount of power cuts. , when the actual cutting amount is greater than When , it indicates that the current measures for controlling broadband oscillations cannot meet the economic and safety requirements of the regional power grid, and therefore the broadband oscillation control function of the new energy station is locked. This setting realizes a new energy multi-station broadband oscillation multi-level control mode driven by the response to the economy and safety of regional power grid users.

[0079] Furthermore, in the absence of a master station and in the absence of communication between new energy stations, the three levels of control are all completed by the control device of the new energy station, so the maximum amount of machine cutting in a new energy station in an oscillation event is a fixed value. After selecting the busbars in the new energy station group, calculate the sum of the amplitudes of the broadband oscillation power of the undecoupled collectors on each selected busbar, or calculate the amplitude ratio of the broadband oscillation power 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; 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 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 machine cutting amount of the new energy station in an oscillation event, the selected collector is the collector of the set capacity and is cut off.

[0080] Step 3.2, 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 together, 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.

[0081] Specifically, the set oscillation characteristics determined by the user include but are not limited to: short-circuit ratio of new energy multiple stations, real-time equivalent impedance of transmission lines, oscillation modal power flow direction, oscillation power amplitude, oscillation current amplitude, oscillation power amplitude ratio. The oscillation characteristics of the transmission line are open to users for selection and adjustment.

[0082] It is worth noting that the transmission line oscillation characteristics proposed in the embodiment are a non-restrictive and preferred choice, and those skilled in the art can adopt different transmission line oscillation characteristics according to actual engineering conditions, scheduling-related requirements and actual needs of power grid users.

[0083] The master station calculates the total cut-off capacity of the new energy station based on the capacity of the collector line decoupled in the broadband oscillation decoupling control of the executing collector line sent by the executing station, and the capacity of the collector line removed in the broadband oscillation selective cutting control of the sending line. When the total cut-off capacity is greater than the maximum total cut-off capacity of the regional power grid in an oscillation event set by the user, all broadband oscillation control functions of the new energy station are blocked. The action delay between each control round is a preset value in the master station, and the set value is developed for the grid user to set.

[0084] The present invention proposes a response-driven wide-area broadband oscillation multi-level control system, comprising: When the execution station is configured only at the new energy station end, the execution station is used to obtain the monitoring data of the new energy station to determine the broadband oscillation information of the collector and the transmission line; set the total number of control rounds of the collector broadband oscillation decoupling control and the transmission line broadband oscillation selection control; in each control round, the execution station performs broadband oscillation monitoring on all undecoupled collectors and all transmission lines; 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 collector of the set capacity or all the collectors on the bus where the collector with broadband oscillation is located; or, when it is determined that a transmission line has broadband oscillation according to the broadband oscillation information of the transmission line , execute the broadband oscillation selection control of the transmission line to cut off the collector line of the set capacity or all the collector lines under the set bus; group the new energy stations according to the short-circuit ratio of the new energy stations, 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 line that broadband oscillation occurs simultaneously in multiple transmission lines, the execution station executes the 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 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.

[0085] The present invention also proposes another response-driven wide-area broadband oscillation multi-level control system, comprising: Configure an execution station at the new energy station end, and configure a master station at the AC system end to which multiple new energy stations are connected; each execution station communicates with the master station, and there is no communication between execution stations; The execution station is used to obtain the monitoring data of the new energy station to determine the broadband oscillation information of the collector and the transmission line; the execution station performs broadband oscillation monitoring on all the collectors that have not been decoupled; the execution station sends the broadband oscillation information of all the 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 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 collector of the set capacity or all the collectors on the bus where the collector with broadband oscillation is 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.

[0086] 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 carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0087] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but 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 above. More specific examples (a non-exhaustive list) of computer-readable storage media 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 disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the above. The computer-readable storage medium used herein is not to be interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0088] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, 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 can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The 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 the computer-readable storage medium in each computing / processing device.

[0089] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent 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 "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, as a separate software package, partially on the user's computer, 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., using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit may execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A response-driven wide-area broadband oscillation multi-level control method, characterized in that: include: Obtain monitoring data from 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, broadband oscillation monitoring is performed on all collector lines that have not been decoupling 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 decoupling 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 all the collector lines under the set bus; 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: include: Only when the broadband oscillation multi-level control device is configured as the 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 and transmission lines; 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 transmission lines to the master station, and the master station performs broadband oscillation monitoring on all the transmission lines.

4. The response-driven wide-area broadband oscillation multi-level control method according to claim 3, characterized in that: Executing the collector line wide-band oscillation decoupling control to decoupling the collector line of set capacity and executing the transmission line wide-band oscillation selective cutting control to cut off the collector line of set capacity, including: Calculate the sum of the amplitudes of the broadband oscillation power of the undecoupled collector wires on each section of the bus, or calculate the amplitude ratio of the broadband oscillation power of all undecoupled collector wires; 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 descending order of the sum of amplitudes or amplitude ratios; Based on the ranking, the collectors are selected in sequence, and when the sum of the capacities of the selected collectors is not less than the set capacity determined by the user, the selected collectors are de-listed or cut off.

5. The response-driven wide-area broadband oscillation multi-level control method according to claim 4, 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.

6. The response-driven wide-area broadband oscillation multi-level control method according to claim 5, 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.

7. The response-driven wide-area broadband oscillation multi-level control method according to claim 6, 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.

8. The response-driven wide-area broadband oscillation multi-level control method according to claim 7, 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.

9. The response-driven wide-area broadband oscillation multi-level control method according to claim 4, 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.

10. The response-driven wide-area broadband oscillation multi-level control method according to claim 9, 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.

11. The response-driven wide-area broadband oscillation multi-level control method according to claim 10, 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.

12. The response-driven wide-area broadband oscillation multi-level control method according to claim 11, 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.

13. 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, 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.

14. The response-driven wide-area broadband oscillation multi-level control method according to claim 13, 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. .

15. The response driven wide area broadband oscillation multi-level control method according to claim 14, 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, .

16. The response driven wide area broadband oscillation multi-level control method according to claim 14, 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.

17. The response driven wide area broadband oscillation multi-level control method according to claim 16, 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.

18. The response driven wide area broadband oscillation multi-level control method according to claim 14, 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.

19. The response driven wide area broadband oscillation multi-level control method according to claim 18, 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.

20. The response-driven wide-area broadband oscillation multi-level control method according to claim 18, 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.

21. The response driven wide area broadband oscillation multi-level control method according to claim 18, 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.

22. A response-driven wide-area broadband oscillation multi-level control system, characterized in that: include: Only when the execution station is configured at the new energy station end, the execution station is used to obtain the monitoring data of the new energy station to determine the broadband oscillation information of the 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.

23. A response-driven wide-area broadband oscillation multi-level control system, 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.

24. 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 21.

25. 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 21 are implemented.

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