A power grid splitting method and system

Abstract

The application discloses a power grid splitting method and system applied to the field of power grid control and comprising the following steps: obtaining generator power information, generator power angle information, power state variables, energy output and load of a target power grid; constructing a power constraint condition based on the generator power information, constructing a power angle stability constraint condition based on the generator power angle information, and constructing a black start constraint condition based on the power state variables; converting an opportunity constraint condition constructed based on the energy output and the load into a deterministic constraint condition; and splitting the target power grid into multiple independent operation partitions based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition and a power grid splitting target. The application constructs deterministic multiple splitting constraints according to the operation state of the target power grid, and splits the target power grid accurately under the guidance of the power grid splitting target.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, and in particular to a power grid disconnection method and system. Background Technology

[0002] When a power grid is subjected to severe disturbances, the resulting faults can spread rapidly, affecting the overall stability of the power system. Taking precise control measures (such as grid disconnection) based on the power system's operating status can improve power system stability and reduce the risk of power system faults. Existing deterministic scheduling-based active grid disconnection methods determine the optimal disconnection boundary by acquiring the power system's state during real-time oscillations. However, when facing energy output with uncertain fluctuations in generation, existing deterministic scheduling-based active grid disconnection methods cannot provide accurate grid disconnection measures. Summary of the Invention

[0003] This invention provides a grid disconnection method and system to solve the technical problem that existing grid active disconnection methods based on deterministic scheduling cannot provide accurate grid disconnection measures when facing energy output with uncertain fluctuations.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a power grid disconnection method, comprising: Acquire generator power information, generator power angle information, power state variables, energy output and load of the target power grid; Power constraints are constructed based on the generator power information, power angle stability constraints are constructed based on the generator power angle information, and black start constraints are constructed based on the power state variables. The opportunity constraints based on the energy output and the load are transformed into deterministic constraints. Based on the power constraints, the power angle stability constraints, the black start constraints, the deterministic constraints, and the grid splitting target, the target grid is split into multiple independent operating zones.

[0005] As one preferred embodiment, the construction of power constraints based on the generator power information includes: Based on the generator active power limit, generator reactive power limit, and generator adjustment rate, determine the generator power constraint; Based on the line impedance, node phase angle difference, node voltage, and line on / off information of the target power grid, power flow constraints are determined. By integrating the generator power constraint and the power flow constraint, the power constraint condition is obtained.

[0006] As one preferred embodiment, the construction of power angle stability constraints based on the generator power angle information includes: Based on the generator rotor power angle trajectory and generator rotor speed, determine the generator zoning constraints; Based on the generator line phase angle and generator line impedance, determine the line power flow constraints; The generator partition constraints and the line power flow constraints are integrated to construct the power angle stability constraint conditions.

[0007] As one preferred embodiment, the construction of black-start constraints based on the power state variables includes: Synchronization vector measurement is performed on the target generator node to obtain the power state variables of the target generator node; Alternatively, the power state variables of the target generator node can be determined based on the synchronization vector measurement results of the neighboring nodes of the target generator node; Based on the number of generator nodes and the power state variables, black start constraints are constructed.

[0008] As one preferred embodiment, the transformation of the opportunity constraints based on the energy output and the load into deterministic constraints includes: Based on the output deviation, load deviation, and generator regulation active power of each generator node, the source load power constraint is determined. By integrating the source-load power constraints and the pre-set confidence level, the opportunity constraints are obtained. The chance constraints are sampled in multiple scenarios to obtain deterministic constraints.

[0009] Another embodiment of the present invention provides a grid disconnection system, comprising: The acquisition module is used to acquire generator power information, generator power angle information, power state variables, energy output and load of the target power grid; The target constraint construction module is used to construct power constraints based on the generator power information, power angle stability constraints based on the generator power angle information, and black start constraints based on the power state variables. A deterministic constraint construction module is used to transform chance constraints constructed based on the energy output and the load into deterministic constraints. The grid disconnection module is used to disconnect the target grid into multiple independent operating zones based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition, and the grid disconnection target.

[0010] As one preferred embodiment, the target constraint construction module includes: The generator power constraint determination unit is used to determine the generator power constraint based on the generator active power limit, the generator reactive power limit, and the generator adjustment rate. The power flow constraint determination unit is used to determine the power flow constraints based on the line impedance, node phase angle difference, node voltage and line on / off information of the target power grid. The power constraint construction unit is used to integrate the generator power constraint and the power flow constraint to obtain the power constraint condition.

[0011] As one preferred embodiment, the target constraint construction module further includes: The generator partition constraint determination unit is used to determine the generator partition constraints based on the generator rotor power angle trajectory and the generator rotor speed. The line power flow constraint determination unit is used to determine the line power flow constraints based on the generator line phase angle and generator line impedance. The power angle stability constraint construction unit is used to integrate and construct the generator partition constraints and the line power flow constraints to obtain the power angle stability constraint conditions.

[0012] As one preferred embodiment, the target constraint construction module further includes: The power state variable determination unit is used to perform synchronization vector measurement on the target generator node to obtain the power state variables of the target generator node; Alternatively, the power state variables of the target generator node can be determined based on the synchronization vector measurement results of the neighboring nodes of the target generator node; The black-start constraint construction unit is used to construct black-start constraints based on the number of generator nodes and the power state variables.

[0013] As one preferred embodiment, the deterministic constraint construction module includes: The source load power constraint determination unit is used to determine the source load power constraint based on the output deviation, load deviation and generator regulation active power of each generator node. An opportunity constraint construction unit is used to integrate the source-load power constraints and the preset confidence level to obtain opportunity constraints. A multi-scenario sampling processing unit is used to perform multi-scenario sampling processing on the chance constraints to obtain deterministic constraints.

[0014] This invention provides a grid disconnection method and system. It acquires a series of information about the target grid, such as generator power information, generator power angle information, power state variables, energy output, and load. Based on the generator power information, generator power angle information, and power state variables, it constructs power constraints, power angle stability constraints, and black-start constraints, respectively. Then, it transforms the opportunistic constraints constructed based on uncertain energy output and load into deterministic constraints. Under multiple constraints such as power constraints, power angle stability constraints, black-start constraints, and deterministic constraints, and based on the grid disconnection logic constructed with the grid disconnection target, it precisely disconnects the target grid into multiple independent operating zones. This invention constructs deterministic multiple disconnection constraints through the operating state of the target grid, and performs precise disconnection of the target grid under the guidance of the grid disconnection target. Attached Figure Description

[0015] Figure 1 This is one of the flowcharts of the power grid disconnection method provided by the present invention; Figure 2 This is the second flowchart of the power grid disconnection method provided by the present invention; Figure 3 This is a schematic diagram of the power grid disconnection system provided by the present invention.

[0016] Figure label: Among them, 301 is the acquisition module; 302 is the target constraint construction module; 303 is the deterministic constraint construction module; and 304 is the power grid disconnection module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this application, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing specific embodiments only and is not intended to limit the invention. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] See Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the power grid disconnection method provided by the present invention, as shown below. Figure 1 As shown, this embodiment includes steps 100 to 400, and the specific steps are as follows: Step 100: Obtain generator power information, generator power angle information, power state variables, energy output and load of the target power grid; Specifically, the generator power information of the target power grid includes the minimum active power output, maximum active power output, minimum reactive power output, and maximum reactive power output of each generator node; it also includes the current active power output and current reactive power output of each generator node; the active power adjustment and reactive power adjustment of each generator node after the target power grid is disconnected; the upward and downward regulation rates of each generator node; and the line impedance between generator nodes, the phase difference between nodes, the node voltage, and the on / off information of the lines between nodes. This generator power information is used to construct power constraints. Generator power angle information includes the generator rotor power angle trajectory, generator rotor speed, generator phase angle, and generator line impedance. This generator power angle information is used to construct power angle stability constraints. The core power state variables include the bus voltage amplitude and bus voltage phase angle, used to describe the real-time operating state of the generators. Energy output and load are used to construct opportunity constraints.

[0022] Step 200: Construct power constraints based on the generator power information, construct power angle stability constraints based on the generator power angle information, and construct black start constraints based on the power state variables; Specifically, one of the power constraints based on the minimum active power output, maximum active power output, current active power output, and active power adjustment of each generator node indicates that the active power output of each generator node is limited by its maximum and minimum technical active power output; another power constraint based on the minimum reactive power output, maximum reactive power output, current reactive power output, and reactive power adjustment of each generator node indicates that the reactive power output of each generator node is limited by its maximum and minimum technical reactive power output; and the third power constraint based on the maximum active power output of each generator node... The third power constraint condition, constructed based on active power output, upward regulation rate, and active power adjustment, indicates that the active power output of each generator node is limited by its active power ramp rate. The fourth power constraint condition, constructed based on the maximum reactive power output, downward regulation rate, and reactive power adjustment of each generator node, indicates that the reactive power output of each generator node is limited by its reactive power ramp rate. The fifth power constraint condition, constructed based on the line impedance between generator nodes, the phase difference between nodes, the node voltage, and the on / off information of the lines between nodes, represents the active power flow equation and the reactive power flow equation of the power grid.

[0023] After a grid disturbance, the rotor power angle trajectories of the generators in a generator group may remain synchronized or asynchronous. Synchronized generators are grouped into the same generator group. To ensure the power angle stability of the generators after grid disconnection, generators whose rotor power angle trajectories and rotor speeds are synchronized (i.e., co-tuning generators) are grouped into the same partition. Black-start constraints based on the power state variables of each generator node are used to monitor the state of the target grid in real time, ensuring the observability of the target grid.

[0024] See Figure 2 , Figure 2 This is a flowchart illustrating another embodiment of the power grid disconnection method provided by the present invention, as shown below. Figure 2 As shown, this embodiment is a further refinement of step 200 above, including steps 210 to 230, each of which is detailed below: Step 210: Determine the generator power constraints based on the generator active power limit, generator reactive power limit, and generator adjustment rate; Step 220: Determine power flow constraints based on the line impedance, node phase angle difference, node voltage, and line on / off information of the target power grid; Step 230: Integrate the generator power constraint and the power flow constraint to obtain the power constraint conditions.

[0025] Specifically, based on constraints on generator power and generator regulation rate, generator power constraint conditions are constructed, as shown in Formulas 1 to 4, where, For generator nodes The minimum active power output; For generator nodes Maximum active power output; For generator nodes The current merits and contributions; After disconnecting the target power grid, the generator node The active power adjustment; For generator nodes The minimum reactive power output; For generator nodes The maximum reactive power output; For generator nodes The current unproductive output; After disconnecting the target power grid, the generator node The reactive power adjustment amount.

[0026] (1) (2) (3) (4) For generator nodes The rate of adjustment refers to the increase in active power output per unit time after the generator receives an increase load command. It reflects the unit's ability to quickly increase output. For generator nodes The rate of decrease in power output refers to the rate by which the generator's active power output decreases per unit time after receiving a load reduction command. It measures the flexibility of the unit to quickly reduce its output.

[0027] (5) (6) Based on constraints on the active and reactive power flow of the power grid, power flow constraints are constructed, as shown in Formulas 5 and 6. Power grid power flow refers to the flow state and distribution pattern of electrical energy in the power system. For generator nodes and generator node The lines between The positive trend on the frontier; For generator nodes and generator node The lines between The unproductive current. It is a line The electrical conductivity; It is a line The susceptance; conductance and susceptance together constitute the admittance. Conductance is the real part of the admittance, and susceptance is the imaginary part of the admittance. The admittance is the reciprocal of the impedance. Therefore, based on the line... The impedance can determine the line Its electrical conductivity and susceptivity.

[0028] For generator nodes The voltage; For generator nodes The voltage; For generator nodes and generator node The phase angle difference; For the line The on / off status, =1 indicates the line Pass, =0 indicates the line Break.

[0029] This embodiment constructs corresponding constraint conditions based on the power constraints of the generator set, the regulation rate of the generator set, and the inherent active and reactive power flow equations of the power grid.

[0030] In another embodiment of the power grid disconnection method provided by the present invention, step 200 further includes: Step 240: Determine generator partition constraints based on generator rotor power angle trajectory and generator rotor speed; Step 250: Determine the line power flow constraints based on the generator line phase angle and generator line impedance; Step 260: Integrate the generator partition constraints and the line power flow constraints to obtain the power angle stability constraint conditions.

[0031] Specifically, based on the constraint of the power angle stability of the generator units in each zone after the generator group is split up, power angle stability constraint conditions are constructed, as shown in Formulas 7 and 8, where the superscript... Represents dummy variables related to power angle stability; This indicates the line introduced when constructing the power angle stability constraint. Virtual trends on the internet; For generator nodes The virtual phase angle; For generator nodes The virtual phase angle; This is a virtual impedance, which can be a small constant. Let K be the set of nodes for the kth co-tuning generator group, k=1,2,...,K, where K is the total number of co-tuning generator groups; These are constants that are not equal.

[0032] (7) ; (8) As shown in Formula 7, if = That is, generator node and generator node In the same homology group, then It can be 1, meaning that after the grid is disconnected, the generator node... and generator node Belonging to the same isolated partition; if ≠ That is, generator node and generator node If they are not in the same harmonic group, then The value is 0, meaning that after the grid is disconnected, the generator node... and generator node They do not belong to the same isolated partition.

[0033] This embodiment constructs corresponding power angle stability constraints by assessing the power angle stability of generator units in each zone after grid disconnection.

[0034] In another embodiment of the power grid disconnection method provided by the present invention, step 200 further includes: Step 270: Perform synchronization vector measurement on the target generator node to obtain the power state variables of the target generator node; Alternatively, the power state variables of the target generator node can be determined based on the synchronization vector measurement results of the neighboring nodes of the target generator node; Step 280: Based on the number of generator nodes and the power state variables, construct black start constraints.

[0035] Specifically, black start refers to the gradual restoration of power supply through self-starting power sources within the power system after a complete power outage due to a fault, without the assistance of external power sources. During grid disconnection, black start constraints are constructed based on the requirements of black start, which necessitate real-time monitoring of the power system's status to ensure its observability.

[0036] (9) As shown in Formula 9, where, Indicates generator node Whether a synchronous vector measurement device is installed at the location, i.e., whether it can measure the generator node. The synchronization vector, =1 indicates that generator nodes can be measured. The synchronization vector, =0 indicates that generator nodes cannot be measured. The synchronization vector, the synchronization vector measurement device can directly measure the power state variables of the generator node. This represents the total number of generator nodes. Formula 9 indicates that at least one synchronization vector measurement device is installed at each generator node. or generator node The adjacent nodes. It can also be accessed through the target generator node. The synchronization vector measurement results of adjacent nodes are used to indirectly calculate the generator node. The power state variables.

[0037] This embodiment ensures the observability of the target power grid by constructing black-start constraints.

[0038] Step 300: Transform the opportunity constraints based on the energy output and the load into deterministic constraints; Specifically, the uncertainty of renewable energy output leads to unpredictable fluctuations in power generation at generator nodes. These fluctuations in energy output and load can affect the power balance of the target power grid. Therefore, it is necessary to transform the opportunistic constraints based on energy output and load into deterministic constraints. This invention provides a method for transforming multiple random variables into deterministic constraints through scenario sampling.

[0039] In another embodiment of the power grid disconnection method provided by the present invention, step 300 specifically includes: Step 310: Determine the source load power constraint based on the output deviation, load deviation and generator regulation active power of each generator node; Step 320: Integrate the source-load power constraints and the preset confidence level to obtain the opportunity constraints; Step 330: Perform multi-scenario sampling processing on the chance constraints to obtain deterministic constraints.

[0040] Specifically, since energy output and load are uncertain, corresponding opportunity constraints are established based on this, and their uncertainty is modeled by opportunity constraint programming. The conservatism of robust programming is mitigated by opportunity constraints with given confidence levels, as shown in Equation 10. Equation 10 is further transformed to obtain Equation 11 and Equation 12.

[0041] (10) (11) (12) in, It is a probability function; , where is the confidence level, representing the probability that the constraint holds. For the generator node in the s-th scenario The deviation between the actual and predicted values ​​of photovoltaic power; For the generator node in the s-th scenario The deviation between the actual and predicted values ​​of wind power in Shanghai; For the generator node in the s-th scenario The deviation between the actual and predicted load values; For the generator node in the s-th scenario The active power regulation of the generator (active power regulation amount).

[0042] (13) (14) (15) By sampling from multiple scenarios, the chance constraints are transformed into deterministic constraints, as shown in Equations 13 to 15, where... and Variables are 0 and 1; It is a constant. If the left side of formula 13 is less than 0, then =0; if the left side of formula 14 is less than 0, then =0. Given confidence level In order to satisfy formula 15, then and At least The second equals 1, meaning the left side of formulas 13 and 14 should be at least 1. The second time greater than 0. According to the law of large numbers, when When the value is large enough, it can be determined that formulas 13 to 15 are equivalent to formulas 11 and 12.

[0043] This embodiment achieves constraint transformation of multiple random variables through scene sampling, transforming chance constraints into deterministic constraints.

[0044] Step 400: Based on the power constraint, the power angle stability constraint, the black start constraint, the deterministic constraint, and the grid splitting target, the target grid is split into multiple independent operating zones.

[0045] Specifically, based on the above constraints, the objective function for the target grid disconnection is determined. The unbalanced power after grid disconnection is an important indicator for measuring the reliability of grid operation. The smaller the unbalanced power after grid disconnection, the better the corresponding disconnection strategy. Therefore, the target of grid disconnection is set as: minimizing the average unbalanced power under different scenarios. The objective function is shown in Formula 16.

[0046] (16) The final operating logic of the grid disconnection model used to disconnect the target grid can be expressed as Equations 1 to 9, and Equations 13 and 16 above.

[0047] This embodiment acquires a series of information about the target power grid, such as generator power information, generator power angle information, power state variables, energy output, and load. Based on the generator power information, generator power angle information, and power state variables, it constructs power constraints, power angle stability constraints, and black start constraints, respectively. Then, the opportunity constraints constructed based on uncertain energy output and load are transformed into deterministic constraints. Under multiple constraints such as power constraints, power angle stability constraints, black start constraints, and deterministic constraints, and based on the grid disconnection target constructed with grid disconnection logic, the target power grid is precisely disconnected into multiple independent operating zones. This invention constructs deterministic multiple disconnection constraints based on the operating state of the target power grid, and performs precise disconnection of the target power grid under the guidance of the grid disconnection target.

[0048] The power grid disconnection system provided by the present invention is described below. The power grid disconnection system described below can be referred to in correspondence with the power grid disconnection method described above.

[0049] Please refer to Figure 3 The present invention also provides a grid disconnection system, comprising: The acquisition module 301 is used to acquire generator power information, generator power angle information, power state variables, energy output and load of the target power grid; The target constraint construction module 302 is used to construct power constraint conditions based on the generator power information, construct power angle stability constraint conditions based on the generator power angle information, and construct black start constraint conditions based on the power state variables. The deterministic constraint construction module 303 is used to convert the chance constraints constructed based on the energy output and the load into deterministic constraints. The grid disconnection module 304 is used to disconnect the target grid into multiple independent operating zones based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition, and the grid disconnection target.

[0050] Optionally, the target constraint construction module includes: The generator power constraint determination unit is used to determine the generator power constraint based on the generator active power limit, the generator reactive power limit, and the generator adjustment rate. The power flow constraint determination unit is used to determine the power flow constraints based on the line impedance, node phase angle difference, node voltage and line on / off information of the target power grid. The power constraint construction unit is used to integrate the generator power constraint and the power flow constraint to obtain the power constraint condition.

[0051] Optionally, the target constraint construction module further includes: The generator partition constraint determination unit is used to determine the generator partition constraints based on the generator rotor power angle trajectory and the generator rotor speed. The line power flow constraint determination unit is used to determine the line power flow constraints based on the generator line phase angle and generator line impedance. The power angle stability constraint construction unit is used to integrate and construct the generator partition constraints and the line power flow constraints to obtain the power angle stability constraint conditions.

[0052] Optionally, the target constraint construction module further includes: The power state variable determination unit is used to perform synchronization vector measurement on the target generator node to obtain the power state variables of the target generator node; Alternatively, the power state variables of the target generator node can be determined based on the synchronization vector measurement results of the neighboring nodes of the target generator node; The black-start constraint construction unit is used to construct black-start constraints based on the number of generator nodes and the power state variables.

[0053] Optionally, the deterministic constraint construction module includes: The source load power constraint determination unit is used to determine the source load power constraint based on the output deviation, load deviation and generator regulation active power of each generator node. An opportunity constraint construction unit is used to integrate the source-load power constraints and the preset confidence level to obtain opportunity constraints. A multi-scenario sampling processing unit is used to perform multi-scenario sampling processing on the chance constraints to obtain deterministic constraints.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for disconnecting power grids, characterized in that, include: Acquire generator power information, generator power angle information, power state variables, energy output and load of the target power grid; Power constraints are constructed based on the generator power information, power angle stability constraints are constructed based on the generator power angle information, and black start constraints are constructed based on the power state variables. The opportunity constraints based on the energy output and the load are transformed into deterministic constraints. Based on the power constraints, the power angle stability constraints, the black start constraints, the deterministic constraints, and the grid splitting target, the target grid is split into multiple independent operating zones; The black-start constraints constructed based on the power state variables include: At least one synchronization vector measurement device is installed at the target generator node or an adjacent node of the target generator node; The synchronization vector measurement device is used to perform synchronization vector measurement on the target generator node or its adjacent nodes to obtain the power state variables of the target generator node. Based on the number of generator nodes and the power state variables, black start constraints are constructed. The process of transforming the opportunity constraints based on the energy output and the load into deterministic constraints includes: Based on the output deviation, load deviation, and generator regulation active power of each generator node, the source load power constraint is determined. By integrating the source-load power constraints and the pre-set confidence level, the opportunity constraints are obtained. The chance constraints are sampled in multiple scenarios to obtain deterministic constraints.

2. The power grid disconnection method as described in claim 1, characterized in that, The power constraint conditions constructed based on the generator power information include: Based on the generator active power limit, generator reactive power limit, and generator adjustment rate, determine the generator power constraint; Based on the line impedance, node phase angle difference, node voltage, and line on / off information of the target power grid, power flow constraints are determined. By integrating the generator power constraint and the power flow constraint, the power constraint condition is obtained.

3. The power grid disconnection method as described in claim 1, characterized in that, The power angle stability constraint conditions constructed based on the generator power angle information include: Based on the generator rotor power angle trajectory and generator rotor speed, determine the generator zoning constraints; Based on the generator line phase angle and generator line impedance, determine the line power flow constraints; The generator partition constraints and the line power flow constraints are integrated to construct the power angle stability constraint conditions.

4. A power grid disconnection system, characterized in that, include: The acquisition module is used to acquire generator power information, generator power angle information, power state variables, energy output and load of the target power grid; The target constraint construction module is used to construct power constraints based on the generator power information, power angle stability constraints based on the generator power angle information, and black start constraints based on the power state variables. A deterministic constraint construction module is used to transform chance constraints constructed based on the energy output and the load into deterministic constraints. The grid disconnection module is used to disconnect the target grid into multiple independent operating zones based on the power constraint condition, the power angle stability constraint condition, the black start constraint condition, the deterministic constraint condition, and the grid disconnection target. The target constraint construction module further includes: The power state variable determination unit is used to perform synchronization vector measurement on the target generator node to obtain the power state variables of the target generator node; Alternatively, the power state variables of the target generator node can be determined based on the synchronization vector measurement results of the neighboring nodes of the target generator node; The black-start constraint construction unit is used to construct black-start constraints based on the number of generator nodes and the power state variables. The deterministic constraint construction module includes: The source load power constraint determination unit is used to determine the source load power constraint based on the output deviation, load deviation and generator regulation active power of each generator node. An opportunity constraint construction unit is used to integrate the source-load power constraints and the preset confidence level to obtain opportunity constraints. A multi-scenario sampling processing unit is used to perform multi-scenario sampling processing on the chance constraints to obtain deterministic constraints.

5. The power grid disconnection system as described in claim 4, characterized in that, The target constraint construction module includes: The generator power constraint determination unit is used to determine the generator power constraint based on the generator active power limit, the generator reactive power limit, and the generator adjustment rate. The power flow constraint determination unit is used to determine the power flow constraints based on the line impedance, node phase angle difference, node voltage and line on / off information of the target power grid. The power constraint construction unit is used to integrate the generator power constraint and the power flow constraint to obtain the power constraint condition.

6. The grid disconnection system as described in claim 4, characterized in that, The target constraint construction module further includes: The generator partition constraint determination unit is used to determine the generator partition constraints based on the generator rotor power angle trajectory and the generator rotor speed. The line power flow constraint determination unit is used to determine the line power flow constraints based on the generator line phase angle and generator line impedance. The power angle stability constraint construction unit is used to integrate and construct the generator partition constraints and the line power flow constraints to obtain the power angle stability constraint conditions.

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