Cooperative oscillation suppression device and method

Abstract

The invention provides an oscillation collaborative suppression device and method, and the device achieves the oscillation suppression through the power grid operation data collected by a plurality of measurement analyzers, the collaborative barrier suppression strategy issued by a collaborative controller, and the control protection device and the impedance remodeling device. Because the operation data of the power grid is real-time data, online suppression of oscillation can be realized. Meanwhile, power grid operation data of a plurality of nodes are considered, and collaborative suppression of oscillation is realized. That is to say, online collaborative suppression of oscillation can be realized in the oscillation generation process, and safe and stable operation of the power system can be ensured. Multi-point layout, collaborative suppression and collaborative blocking suppression are integrated, online collaborative centralized suppression of oscillation is achieved, the requirements of new energy station grid connection and high-proportion power electronic equipment for the stability of a power system can be met, and the method can be applied to weak / receiving end high-capacity new energy collection scenes and regional power transmission and distribution network scenes with massive isomerization interfaces.

Description

Technical Field

[0001] The present application relates to the technical field of power system automation, and in particular to an oscillation cooperative suppression device and method. Background Art

[0002] With the rapid development of new energy technologies such as wind power and photovoltaic power generation, power systems including new energy stations have been widely used. However, this will bring about the stability problem of the power system. The stability of the power system specifically refers to the ability of the power system to return to an operating equilibrium state after being disturbed by an oscillation. The destruction of the stability of the power system may cause power outages for a large number of users, with extremely serious consequences. Therefore, it is necessary to improve the stability of the power system to ensure the safe and reliable operation of the power system.

[0003] There is impedance interaction between new energy stations, collection stations and power grids in the power system. The oscillation cooperative suppression device provided by the related technology changes the impedance distribution of the power grid by setting impedance reshaping devices and control protection devices at oscillation-sensitive nodes, thereby achieving oscillation suppression. However, since the suppression method provided by the related technology is offline suppression, and the suppression time node is after the oscillation occurs, the safe and stable operation of the power system cannot be guaranteed. Summary of the invention

[0004] In order to solve the problem that the existing technology cannot ensure the safe and stable operation of the power system, the present application provides an oscillation cooperative suppression device, which may include multiple measurement analyzers, a cooperative controller, a control and protection device, and an impedance reshaping device.

[0005] Each measurement analyzer is used to collect grid operation data and upload it to the collaborative controller.

[0006] The collaborative controller is used to: send a collaborative isolation and suppression strategy to a measurement analyzer connected to a control protection device and an impedance reshaping device on the branch according to power grid operation data.

[0007] The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch is used to send an oscillation suppression instruction to the control protection device according to the coordinated isolation suppression strategy.

[0008] The control protection device is used to generate a control signal according to an oscillation suppression instruction and send it to the impedance reshaping device.

[0009] The impedance reshaping device is used to suppress oscillation according to the control signal.

[0010] In some possible implementations, the measurement analyzer connected to the control protection device and the impedance reshaping device on the branch is also used to: evaluate the oscillation suppression effect of the impedance reshaping device based on the grid operation data, and update the oscillation suppression instruction based on the evaluation results and the collaborative isolation suppression strategy.

[0011] Optionally, the power grid operation data includes equipment status data, line operation data, oscillation alarm data, and sampling and recording data of oscillation risk nodes. Among them, oscillation sensitive nodes are nodes where oscillation may occur, which can be new energy stations, collection stations, power grids, etc.

[0012] In some other possible implementations, the collaborative controller is specifically used to:

[0013] The oscillation properties of the oscillation risk nodes are identified online according to the grid operation data and the oscillation modes are recognized. A collaborative isolation and suppression strategy is formed according to the oscillation properties and oscillation modes and sent to the measurement analyzer connected to the control protection device and the impedance reshaping device on the branch.

[0014] Optionally, the oscillation properties include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node. The oscillation mode includes an oscillation frequency, an oscillation voltage amplitude, and an oscillation voltage phase.

[0015] Exemplarily, the impedance reshaping device includes a valve control unit, a valve unit, and a connection reactor.

[0016] The valve control unit is used to enable the working mode of the impedance reshaping device according to the control signal and generate a trigger signal to the valve unit.

[0017] The valve unit is used to form a target voltage according to a trigger signal.

[0018] The connected reactor is used to generate a target current according to a target voltage, inject the target current into an oscillation risk node, and suppress oscillation by correcting the equivalent impedance of the oscillation risk node.

[0019] Optionally, the operating mode includes an oscillation suppression mode, a transient compensation mode, or a high and low voltage ride-through mode.

[0020] In some other possible implementations, the control protection device is further used to:

[0021] The working state and operation data of the impedance reshaping device are detected, and the operation mode of the impedance reshaping device is controlled according to the working state and operation data.

[0022] The working state includes detecting a communication failure, a drive failure, or insufficient power module redundancy of the impedance reshaping device. The operating data includes the current and voltage of the branch where the impedance reshaping device is located, and the temperature of the primary equipment in the impedance reshaping device. The operating mode includes tripping, locking, derating, or operating at rated output.

[0023] In a second aspect, the present application also provides a method for cooperatively suppressing oscillations, comprising:

[0024] Each measurement analyzer collects grid operation data and uploads it to the collaborative controller.

[0025] The collaborative controller sends a collaborative isolation and suppression strategy to a measurement analyzer connected to a control and protection device and an impedance reshaping device on the branch according to the grid operation data.

[0026] The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch sends an oscillation suppression instruction to the control protection device according to the coordinated isolation suppression strategy.

[0027] The control protection device generates a control signal according to the oscillation suppression instruction and sends it to the impedance reshaping device.

[0028] The impedance reshaping device suppresses the oscillation according to the control signal.

[0029] In a possible implementation, the oscillation cooperative suppression method further includes:

[0030] A measurement analyzer connected to a control protection device and an impedance reshaping device on the branch evaluates the oscillation suppression effect of the impedance reshaping device according to grid operation data, and updates the oscillation suppression instruction according to the evaluation result and the coordinated isolation suppression strategy.

[0031] Optionally, the power grid operation data includes equipment status data, line operation data, oscillation alarm data, and sampling and recording data of oscillation risk nodes.

[0032] In another possible implementation, the collaborative controller sends a collaborative isolation and suppression strategy to a measurement analyzer connected to a control and protection device and an impedance reshaping device on the branch according to the grid operation data, including:

[0033] The collaborative controller identifies the oscillation properties and oscillation modes of the oscillation risk nodes online based on the grid operation data, forms a collaborative isolation and suppression strategy based on the oscillation properties and oscillation modes, and sends it to the measurement analyzer connected to the control protection device and impedance reshaping device on the branch.

[0034] Optionally, the oscillation properties include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node. The oscillation mode includes an oscillation frequency, an oscillation voltage amplitude, and an oscillation voltage phase.

[0035] In another possible oscillation mode, the impedance reshaping device suppresses the oscillation according to the control signal, including:

[0036] The valve control unit of the impedance reshaping device enables the working mode of the impedance reshaping device according to the control signal and generates a trigger signal to the valve unit of the impedance reshaping device.

[0037] The valve unit forms a target voltage according to the trigger signal.

[0038] The connected inductor of the impedance reshaping device generates a target current according to the target voltage, and injects the target current into the oscillation risk node, thereby suppressing the oscillation by correcting the equivalent impedance of the oscillation risk node.

[0039] Exemplarily, the operating modes include an oscillation suppression mode, a transient compensation mode, or a high and low voltage ride-through mode.

[0040] In yet another possible implementation, the oscillation cooperative suppression method further includes:

[0041] The working state and operation data of the impedance reshaping device are detected, and the operation mode of the impedance reshaping device is controlled according to the working state and operation data.

[0042] The working state includes detecting a communication failure, a drive failure, or insufficient power module redundancy of the impedance reshaping device. The operating data includes the current and voltage of the branch where the impedance reshaping device is located, and the temperature of the valve unit and the connected reactor. The operating mode includes tripping, locking, derating, or operation at rated output.

[0043] Compared with the prior art, the beneficial effects of this application are:

[0044] The oscillation collaborative suppression device provided in the present application collects grid operation data through multiple measurement analyzers, and issues a collaborative isolation suppression strategy through a collaborative controller, combining a control protection device and an impedance reshaping device to achieve oscillation suppression. It can be seen that since the grid operation data is real-time data, the present application can achieve online suppression of oscillations. At the same time, the present application takes into account the grid operation data of multiple nodes and achieves collaborative suppression of oscillations. In other words, the present application can achieve online collaborative suppression of oscillations during the oscillation process, which can ensure the safe and stable operation of the power system.

[0045] The oscillation collaborative suppression device provided in the present application includes multiple measurement analyzers and collaborative controllers. That is, the present application integrates multi-point layout, collaborative suppression and collaborative barrier suppression to achieve online collaborative centralized suppression of oscillations, which can meet the requirements of new energy station grid connection and high-proportion power electronic equipment for power system stability.

[0046] The technical solution provided in this application can be applied to weak / receiving end large-capacity new energy aggregation scenarios and regional transmission and distribution network scenarios with massive heterogeneous interfaces.

[0047] The present application realizes online identification of the oscillation properties of oscillation risk nodes and recognition of oscillation modes through a collaborative controller, and provides a collaborative blocking suppression strategy for the measurement analyzer connected to the control protection device and the impedance reshaping device on the branch, that is, provides an oscillation auxiliary suppression strategy for the measurement analyzer, thereby improving the oscillation suppression capability of the entire oscillation collaborative suppression device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 is a schematic structural diagram of an oscillation cooperative suppression device in an embodiment of the present application;

[0050] Figure 2 is another schematic structural diagram of the oscillation cooperative suppression device in an embodiment of the present application;

[0051] Figure 3 is a schematic structural diagram of an impedance reshaping device in an embodiment of the present application;

[0052] Figure 4a A schematic structural diagram of a method of connecting an impedance reshaping device to a power grid in an embodiment of the present application;

[0053] Figure 4b Another schematic structural diagram of a method of connecting an impedance reshaping device to a power grid in an embodiment of the present application;

[0054] Figure 4c This is another schematic structural diagram of a method of connecting the impedance reshaping device to the power grid in an embodiment of the present application;

[0055] Figure 4d This is another schematic structural diagram of a method of connecting the impedance reshaping device to the power grid in an embodiment of the present application;

[0056] Figure 5a is a schematic structural diagram of a valve unit in the impedance reshaping device in an embodiment of the present application;

[0057] Figure 5b is another schematic structural diagram of a valve unit in the impedance reshaping device in an embodiment of the present application;

[0058] Figure 5c is another schematic structural diagram of a valve unit in the impedance reshaping device in an embodiment of the present application;

[0059] Figure 6 A schematic flowchart of the oscillation cooperative suppression method in an embodiment of the present application. DETAILED DESCRIPTION

[0060] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0061] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0062] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0063] The present application provides an oscillation cooperative suppression device, such as Figure 1 The oscillation cooperative suppression device 100 may include a plurality of measurement analyzers, a cooperative controller 20, a control protection device 30 and an impedance reshaping device 40. Optionally, the plurality of measurement analyzers may include a measurement analyzer 11, a measurement analyzer 12, ..., a measurement analyzer M.

[0064] Exemplarily, each measurement analyzer is used to collect power grid operation data and upload the data to the collaborative controller 20 . Figure 1 In the embodiment, the measurement analyzer 11 uploads the grid operation data D1 to the collaborative controller 20 , the measurement analyzer 12 uploads the grid operation data D2 to the collaborative controller 20 , and the measurement analyzer M uploads the grid operation data DM to the collaborative controller 20 .

[0065] The collaborative controller 20 is used to send a collaborative isolation and suppression strategy to a measurement analyzer (eg, measurement analyzer M) connected to a control and protection device 40 and an impedance reshaping device 30 on the branch according to the grid operation data.

[0066] The measurement analyzer (eg, measurement analyzer M) connected to the control protection device and the impedance reshaping device on the branch is used to send an oscillation suppression instruction downward to the control protection device 40 according to the coordinated blocking suppression strategy.

[0067] The control protection device 40 is used to generate a control signal according to the oscillation suppression instruction and send it to the impedance reshaping device 30 .

[0068] The impedance reshaping device 30 is used to suppress oscillation according to the control signal.

[0069] Optionally, multiple measurement analyzers can be deployed at multiple oscillation-sensitive nodes. Oscillation-sensitive nodes are nodes where oscillation may occur, and can be new energy stations, collection stations, power grids, etc. Figure 2 As shown, the plurality of oscillation-sensitive nodes include a node P1 , a node P2 , a node P3 , a node P4 , a node P5 , a node P6 , a node P7 , a node P8 , a node P9 , a node P10 , a node P11 , a node P12 , a node P13 and a node P14 .

[0070] Optionally, the oscillation cooperative suppression device 100 may further include a router 50 , and the cooperative controller 20 communicates with the multiple measurement analyzers through the router.

[0071] The first energy storage system (which can be a conventional energy storage system) can be connected to the 220kV AC bus through node P1. The offshore AC wind farm is connected to the 220kV AC bus through node P3. The offshore DC wind farm is connected to the 220kV AC bus through node P5. The impedance reshaping device 30 and the control protection device 40 can be connected to the metering station, the metering station is connected to the AC photovoltaic power station, and the AC photovoltaic power station is connected to the 220kV AC bus through node P7. The low-frequency photovoltaic power station is connected to the 220kV AC bus through node P9. The hydropower unit and the thermal power unit are connected to the 220kV AC bus through node P10.

[0072] Similarly, the second energy storage system (which can be an MMC energy storage system) is connected to the 500kV AC bus through node P12. The impedance reshaping device 30 and the control protection device 40 can also be connected to the 500kV AC bus. The 500kV AC bus is then connected to the transformer through node P13, and the transformer is connected to the power grid through node P14. The 500kV AC bus is connected to the 200Kv AC bus through a transformer.

[0073] from Figure 2 It can be seen that in the oscillation cooperative suppression device, the number of impedance reshaping devices 30 and the number of control and protection devices 40 can be the same.

[0074] In some embodiments, the collaborative controller 20 is specifically configured to:

[0075] According to the grid operation data (which may include grid operation data D1, grid operation data D2, ..., grid operation data DM), the oscillation properties of the oscillation risk node are identified online and the oscillation mode is recognized. According to the oscillation properties and oscillation mode, a collaborative isolation and suppression strategy is formed and sent to the measurement analyzer connected to the control protection device and the impedance reshaping device on the branch.

[0076] Optionally, the oscillation properties may include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node. The oscillation mode may include an oscillation frequency, an oscillation voltage amplitude, and an oscillation voltage phase.

[0077] For example, Figure 3 As shown, the impedance reshaping device 30 includes a valve control unit 31 , a valve unit 32 and a connecting reactor 33 .

[0078] The valve control unit 31 is used to receive a control signal, enable the working mode of the impedance reshaping device 30 according to the control signal, and generate a trigger signal to the valve unit 32 .

[0079] The valve unit 32 is used to form a target voltage according to a trigger signal.

[0080] The connecting reactor 33 is used to generate a target current according to the target voltage, inject the target current into the oscillation risk node, and suppress the oscillation by correcting the equivalent impedance of the oscillation risk node. The connecting reactor 33 is used to realize power exchange between the power grid and the valve unit 32 and smooth the current waveform.

[0081] Optionally, the working mode of the impedance reshaping device 30 includes an oscillation suppression mode, a transient compensation mode or a high and low voltage ride-through mode.

[0082] Optional, such as Figure 4a As shown, the impedance reshaping device 30 may also include a passive filtering unit 34. The valve control unit 31, the valve unit 32, the connecting inductor 33 and the passive filtering unit 34 are connected in sequence, and the impedance reshaping device 30 is directly connected to the 525kV ultra-high voltage power grid through the passive filtering unit 34. The passive filtering unit 34 is connected in series with the connecting inductor 33 to connect the valve unit 32 to the ultra-high voltage power grid and cooperate with the valve unit 32 to achieve impedance reshaping.

[0083] like Figure 4b As shown, the impedance reshaping device 30 may also include a transformer 35. The valve control unit 31, the valve unit 32, the connecting inductor 33 and the transformer 35 are connected in sequence, and the impedance reshaping device 30 is connected to the 525kV ultra-high voltage power grid through the transformer 35. In other words, the transformer 35 is used to connect the valve unit 32 to the ultra-high voltage power grid and cooperate with the valve unit 32 to achieve impedance reshaping.

[0084] like Figure 4cAs shown, the impedance reshaping device 30 can also be connected to a medium-high voltage power grid (35 kV) in a direct hanging manner.

[0085] like Figure 4d As shown, the impedance reshaping device 30 can also be connected in series to a medium voltage grid (10 kV).

[0086] Exemplarily, the valve unit 32 is used to achieve the change of the impedance characteristic of the target point, and the three-phase cascade valve unit can select a delta connection mode or a star connection mode.

[0087] like Figure 5a , Figure 5b and Figure 5c As shown, the valve unit 32 may include N cascaded power modules. Figure 5a and Figure 5b The N power modules may include a power module M1, a power module M2, ..., a power module MN. Figure 5a Each power module can adopt a full-bridge structure. Figure 5b Each power module can adopt a half-bridge structure.

[0088] refer to Figure 5c The multiple power modules may include power module M1, power module M2, ..., power module Mn, power module M(n+1), power module M(n+2), ..., power module MN. Figure 5c In the embodiment, some power modules may adopt a full-bridge structure, and some power modules may adopt a half-bridge structure.

[0089] In some possible implementations, the control protection device 40 is further used to:

[0090] The working state and operation data of the impedance reshaping device 30 are detected, and the operation mode of the impedance reshaping device 30 is controlled according to the working state and the operation data.

[0091] The working state includes detecting a communication failure, a drive failure, or insufficient power module redundancy of the impedance reshaping device 30. The operating data includes the current and voltage of the branch where the impedance reshaping device 30 is located, and the temperature of the primary equipment (such as the valve unit 31 and the connection reactor 33) in the impedance reshaping device 30. The operating mode includes tripping, locking, derating, or operation at rated output.

[0092] The present application embodiment provides a method for cooperatively suppressing oscillations. Figure 6 As shown, the oscillation cooperative suppression method 200 includes the following steps:

[0093] Step S1 : each measurement analyzer in the above-mentioned oscillation cooperative suppression device 100 collects grid operation data and uploads it to the cooperative controller 200 .

[0094] Step S2: The collaborative controller 200 sends a collaborative isolation and suppression strategy to the measurement analyzer connected to the control and protection device 40 and the impedance reshaping device 30 on the branch according to the grid operation data.

[0095] Step S3: The measurement analyzer on the branch connected with the control protection device 40 and the impedance reshaping device 30 sends an oscillation suppression instruction to the control protection device 40 according to the coordinated blocking suppression strategy.

[0096] Step S4: the control protection device 40 generates a control signal according to the oscillation suppression instruction and sends it to the impedance reshaping device 30 .

[0097] Step S5: the impedance reshaping device 40 suppresses the oscillation according to the control signal.

[0098] In a possible implementation, the oscillation cooperative suppression method 200 further includes:

[0099] The measurement analyzer connected to the control protection device 40 and the impedance reshaping device 30 on the branch can evaluate the oscillation suppression effect of the impedance reshaping device 30 according to the grid operation data, and update the oscillation suppression instruction according to the evaluation result and the coordinated isolation suppression strategy.

[0100] Optionally, the above-mentioned power grid operation data includes equipment status data, line operation data, oscillation alarm data and oscillation risk nodes (refer to Figure 2 )’s sampled recorded data.

[0101] In another possible implementation, the collaborative controller 20 sends a collaborative isolation and suppression strategy to a measurement analyzer connected to the control protection device 40 and the impedance reshaping device 30 on the branch according to the grid operation data, including:

[0102] The collaborative controller 20 identifies the oscillation properties of the oscillation risk node and recognizes the oscillation mode online based on the grid operation data, forms a collaborative isolation and suppression strategy based on the oscillation properties and oscillation mode, and sends it to the measurement analyzer on the branch line connected to the control protection device 40 and the impedance reshaping device 30.

[0103] Optionally, the oscillation properties may include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node. The oscillation mode includes an oscillation frequency, an oscillation voltage amplitude, an oscillation voltage phase, and the like.

[0104] In another possible oscillation mode, the impedance reshaping device 30 may suppress the oscillation according to the control signal, including:

[0105] Figure 3The valve control unit 31 of the impedance reshaping device 30 shown enables the working mode of the impedance reshaping device 30 according to the control signal and generates a trigger signal to the valve unit 32 of the impedance reshaping device 30 .

[0106] The valve unit 32 forms a target voltage according to the trigger signal.

[0107] The connection reactor 33 of the impedance reshaping device 30 generates a target current according to the target voltage, and injects the target current into the oscillation risk node, thereby suppressing the oscillation by correcting the equivalent impedance of the oscillation risk node.

[0108] Exemplarily, the working modes of the impedance reshaping device 30 include an oscillation suppression mode, a transient compensation mode, or a high and low voltage ride-through mode.

[0109] In yet another possible implementation, the oscillation cooperative suppression method 200 further includes:

[0110] The working state and operation data of the impedance reshaping device 30 are detected, and the operation mode of the impedance reshaping device 30 is controlled according to the working state and the operation data.

[0111] The working state includes detecting a communication failure, a drive failure, or insufficient power module redundancy of the impedance reshaping device 30. The operating data includes the current and voltage of the branch where the impedance reshaping device 30 is located, and the temperature of the valve unit and the connected reactor. The operating mode includes tripping, locking, derating, or operating at rated output.

[0112] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An oscillation cooperative suppression device, characterized in that: It includes a plurality of measurement analyzers, a coordinated controller, a control protection device and an impedance reshaping device; Each of the plurality of measurement analyzers is used to: collect power grid operation data and upload the data to the collaborative controller; The collaborative controller is used to: send a collaborative isolation and suppression strategy to a measurement analyzer connected to the control and protection device and the impedance reshaping device on the branch according to the power grid operation data; The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch is used to: send an oscillation suppression instruction downward to the control protection device according to the coordinated isolation suppression strategy; The control protection device is used to: generate a control signal according to the oscillation suppression instruction and send it to the impedance reshaping device; The impedance reshaping device is used to suppress oscillation according to the control signal.

2. The oscillation cooperative suppression device according to claim 1, characterized in that: The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch is also used to: evaluate the oscillation suppression effect of the impedance reshaping device according to the power grid operation data, and update the oscillation suppression instruction according to the evaluation result and the collaborative isolation suppression strategy.

3. The oscillation cooperative suppression device according to claim 1, characterized in that: The power grid operation data includes equipment status data, line operation data, oscillation alarm data, and sampling and recording data of oscillation risk nodes.

4. The oscillation cooperative suppression device according to claim 3, characterized in that: The collaborative controller is specifically used for: The oscillation properties of the oscillation risk node are identified online according to the grid operation data and the oscillation mode is recognized, and the collaborative isolation and suppression strategy is formed according to the oscillation properties and the oscillation mode and sent to the measurement analyzer on the branch connected with the control protection device and the impedance reshaping device.

5. The oscillation cooperative suppression device according to claim 4, characterized in that: The oscillation properties include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node; The oscillation mode includes an oscillation frequency, an oscillation voltage amplitude and an oscillation voltage phase.

6. The oscillation cooperative suppression device according to claim 3, characterized in that: The impedance reshaping device includes a valve control unit, a valve unit and a connection reactor; The valve control unit is used to: enable the working mode of the impedance reshaping device according to the control signal and generate a trigger signal to the valve unit; The valve unit is used to: form a target voltage according to the trigger signal; The connection reactor is used to generate a target current according to the target voltage, inject the target current into the oscillation risk node, and suppress the oscillation by correcting the equivalent impedance of the oscillation risk node.

7. The oscillation cooperative suppression device according to claim 6, characterized in that: The working modes include an oscillation suppression mode, a transient compensation mode or a high and low voltage ride-through mode.

8. The oscillation cooperative suppression device according to claim 1, characterized in that: The control protection device is also used for: detecting a working state and operating data of the impedance reshaping device, and controlling an operating mode of the impedance reshaping device according to the working state and the operating data; Among them, the working state includes detecting a communication failure, a drive failure or insufficient power module redundancy of the impedance reshaping device; the operating data includes the current and voltage of the branch where the impedance reshaping device is located and the temperature of the primary equipment in the impedance reshaping device; the operating mode includes tripping, locking, derating operation or operation at rated output.

9. A method for cooperatively suppressing oscillations, characterized in that: include: Each measurement analyzer collects grid operation data and uploads it to the collaborative controller; The collaborative controller sends a collaborative blocking suppression strategy to a measurement analyzer connected to the control protection device and the impedance reshaping device on the branch according to the power grid operation data; The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch sends an oscillation suppression instruction to the control protection device according to the collaborative blocking suppression strategy; The control protection device generates a control signal according to the oscillation suppression instruction and sends it to the impedance reshaping device; The impedance reshaping device suppresses oscillation according to the control signal.

10. The oscillation cooperative suppression method according to claim 9, characterized in that: The oscillation cooperative suppression method further comprises: The measurement analyzer connected to the control protection device and the impedance reshaping device on the branch evaluates the oscillation suppression effect of the impedance reshaping device according to the grid operation data, and updates the oscillation suppression instruction according to the evaluation result and the collaborative isolation suppression strategy.

11. The oscillation cooperative suppression method according to claim 9, characterized in that: The power grid operation data includes equipment status data, line operation data, oscillation alarm data, and sampling and recording data of oscillation risk nodes.

12. The oscillation cooperative suppression method according to claim 11, characterized in that: The collaborative controller sends a collaborative blocking and suppression strategy to a measurement analyzer connected to the control and protection device and the impedance reshaping device on the branch according to the power grid operation data, including: The collaborative controller identifies the oscillation properties of the oscillation risk node and recognizes the oscillation mode online based on the power grid operation data, forms the collaborative isolation and suppression strategy based on the oscillation properties and the oscillation mode, and sends it to the measurement analyzer on the branch line connected to the control protection device and the impedance reshaping device.

13. The oscillation cooperative suppression method according to claim 12, characterized in that: The oscillation properties include an oscillation source node, an oscillation propagation path node, and an oscillation receiving node; The oscillation mode includes an oscillation frequency, an oscillation voltage amplitude and an oscillation voltage phase.

14. The oscillation cooperative suppression method according to claim 11, characterized in that: The impedance reshaping device suppresses oscillation according to the control signal, including: The valve control unit of the impedance reshaping device enables the working mode of the impedance reshaping device according to the control signal and generates a trigger signal to the valve unit of the impedance reshaping device; The valve unit forms a target voltage according to the trigger signal; The connection inductor of the impedance reshaping device generates a target current according to the target voltage, and injects the target current into the oscillation risk node, thereby suppressing the oscillation by correcting the equivalent impedance of the oscillation risk node.

15. The oscillation cooperative suppression method according to claim 14, characterized in that: The working modes include an oscillation suppression mode, a transient compensation mode or a high and low voltage ride-through mode.

16. The oscillation cooperative suppression method according to claim 14, characterized in that: The oscillation cooperative suppression method further comprises: detecting a working state and operating data of the impedance reshaping device, and controlling an operating mode of the impedance reshaping device according to the working state and the operating data; Among them, the working state includes detecting a communication failure, a drive failure or insufficient power module redundancy of the impedance reshaping device; the operating data includes the current and voltage of the branch where the impedance reshaping device is located, and the temperature of the valve unit and the connected inductor; the operating mode includes tripping, locking, derating operation or operation at rated output.

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