New energy station reactive power coordination control method and system

Abstract

The invention discloses a new energy station reactive power coordination control method and system, and relates to the technical field of station coordination, and the method comprises the steps: collecting the data of a new energy station, constructing a target function, and setting a penalty factor; layered and partitioned control is implemented, terminal voltage and power factors of substations are set, and reactive voltage is optimized; the grid-connected point voltage of the power station is pre-judged and regulated, and the maximum capacity of reactive power regulation equipment is exerted; establishing a master-slave station communication and data transmission system, and integrating a reactive voltage control platform to carry out global analysis; and dividing a voltage control area, and performing closed-loop control based on a whole-network reactive target function. According to the invention, the active loss of the system caused by unnecessary reactive power flow is reduced; data are collected in real time through the AVC system and are analyzed and calculated on line, all load voltage regulation devices and reactive compensation devices of all substations in a power grid are monitored in a centralized mode, managed in a unified mode and controlled on line, and reactive voltage optimization control closed-loop operation of the whole grid is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of station coordination, and in particular to a reactive power coordination control method and system for a new energy station. Background Art

[0002] With the increasing reduction of traditional energy, renewable energy power generation has been increasingly widely used in my country in recent years. Compared with traditional power generation methods, renewable energy power generation has the advantages of being renewable, pollution-free, and having a short construction period. Wind and photovoltaic resources themselves have the characteristics of randomness, intermittency, periodicity, and volatility. The simultaneous grid connection of large-capacity wind power will cause the bus voltage quality of the connected substation to drop rapidly. The grid connection of photovoltaic power will also have a certain impact on the voltage quality of the distribution network and high-voltage transmission network.

[0003] The present invention overcomes the shortcomings of the prior art and provides a reactive power coordination control method for a new energy station. The reactive power of the grid-connected wind turbine and photovoltaic inverter, the input amount of reactive compensation equipment or the transformer substation voltage boost and transformer ratio are adjusted through a certain strategy to adjust the reactive power and voltage of the power station so that the voltage at the grid-connected point is within the normal operating range. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is: how to solve the problem that the existing large-capacity wind power grid connection will cause the bus voltage quality of the connected substation to drop rapidly, and the grid connection of photovoltaic power will also have a certain impact on the voltage quality of the distribution network and high-voltage transmission network.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for coordinated reactive power control of new energy stations, comprising: collecting data from new energy stations, constructing an objective function, and setting a penalty factor; implementing hierarchical and partitioned control, and setting the substation terminal voltage and power factor to optimize the reactive voltage; predicting and adjusting the voltage at the power station grid connection point to maximize the capacity of the reactive power regulation equipment; establishing a master-substation communication and data transmission system, and integrating a reactive voltage control platform for global analysis; dividing the voltage control area, and performing closed-loop control based on the reactive power objective function of the entire network.

[0007] As a preferred solution of the reactive power coordinated control method of a new energy station described in the present invention, the objective function includes the voltage of the main network central bus, the voltage of the photovoltaic power station grid connection point, the reactive power of the main network gateway and the reactive power of the booster station gateway as the penalty function, and the objective function is expressed as:

[0008]

[0009] Among them, ΔP ioss is the active network loss of the system, is the penalty function for the voltage exceeding the limit of the central busbar, n1 is the number of central buses in the system, is the penalty function for the voltage exceeding the limit of the high-voltage busbar on the booster station, n2 is the number of high-voltage busbars on the booster station, is the penalty function for the voltage exceeding the limit at the photovoltaic power station grid connection point, n3 is the number of buses at the photovoltaic power station grid connection point, The penalty function for the reactive power exceeding the limit of the main network interface, n4 is the number of main network interfaces, is the penalty function for reactive power exceeding the limit at the booster station checkpoint, and n5 is the number of booster station checkpoints.

[0010] As a preferred solution of the reactive power coordinated control method of a new energy station described in the present invention, the penalty factors include each penalty factor λ which is an open parameter, which is set according to the priority of each level of voltage, reactive power and network loss, and the priority option has a large penalty factor.

[0011] As a preferred solution of the reactive coordination control method of a new energy station described in the present invention, the hierarchical and zoned control includes dividing the part of the wind farm and photovoltaic power station 110kV and below lines connected to the main grid into the regional power grid control area to participate in the regional reactive voltage optimization; the main station sets the substation-end grid connection point voltage control value or power factor according to the reactive power regulation capability and balance of each area, and the wind farm and photovoltaic power station substation reasonably controls the wind turbine, photovoltaic inverter, centralized reactive compensation device and transformer according to the set voltage value, so that the grid connection point voltage meets the control requirements.

[0012] As a preferred solution of the reactive power coordination control method of a new energy station described in the present invention, wherein: the pre-judgment and adjustment of the voltage at the power station grid connection point includes adjusting the voltage setting value of the power station grid connection point by pre-judgment of the reactive power demand and adjustable range of the wind farm and photovoltaic power station; based on the power forecast of the wind power and photovoltaic power station, the slow discrete power regulation equipment, parallel capacitors, reactors and fast continuous reactive power regulation equipment are coordinated and controlled, and the static reactive power compensation device of the capacitor and reactor is controlled in advance; the establishment of the master-substation communication and data transmission system includes the master station and the substation system realizing communication through the dispatching data network connection on the basis of meeting the secondary protection requirements, and through the standardized interface Build a seamless connection for data transmission; all functional software of the master station should be integrated into the same platform to realize reactive voltage control of the cluster. The master station system should perform global analysis and calculation based on the global network model and real-time data, and implement closed-loop control through hierarchical zoning; the master station divides the voltage control area according to the voltage level, and based on the reactive power objective function of the whole network, on the premise of ensuring stability indicators and optimal reactive power of the whole network, gives the set reference value and interconnection line information of the voltage amplitude of the central bus node of each control area. The substation controls the reactive power according to the available reactive equipment in the area, including SVC equipment, conventional unit AVR, and switchable capacitors, according to the set voltage reference value and adjustment amount.

[0013] As a preferred solution of the reactive power coordinated control method of a new energy station described in the present invention, the over-limit includes the over-limit value of voltage and reactive power expressed as:

[0014] ΔV i =V i -V imax (V i >V imax )

[0015] ΔV i =0(V i =V imax )

[0016] ΔV i =V imax -V i (V i <V imax )

[0017] ΔQ si =Q si -Q simax (Q si >Q simax )

[0018] ΔQ si =0(Q si =Q simax )

[0019] ΔQ si =Q simax- Q si (Q si <Q simax )

[0020] ΔQ di =Q di -Q dimax (Q di >Q dimax )

[0021] ΔQ di =0(Q di =Q dimax )

[0022] ΔQ di =Q dimax -Q di (Q di <Q dimax )

[0023] Where, ΔV i is the voltage difference of the ith bus, V i is the voltage value of the ith bus, V imaxis the maximum voltage of the i-th bus, ΔQ si and Q simax are the reactive power value and the maximum reactive power of the ith main gateway port, Q di and Q dimax are the reactive power value and maximum reactive power of the i-th booster station respectively.

[0024] As a preferred solution of the reactive power coordinated control method of a new energy station described in the present invention, wherein: the substation includes a substation to ensure that the voltage is qualified, which is consistent with the control direction of the secondary voltage control, and the control target is controlled according to the topology type. If the booster station has a high-voltage side bus and the topology is to the 330kV and 220kV main grid of the ground adjustment, the high-voltage side bus in the booster station is used as the control target. If the booster station does not have a high-voltage side bus or the high-voltage side bus cannot be measured, the high-voltage side bus of the booster station of the opposite line is searched through the topological relationship; after the topological search partition is completed, the main station is partitioned based on the network topology technology according to the structure of the booster station outgoing line connected to the regional power grid to check whether the control target voltage exceeds the limit. When the voltage exceeds the limit, over-limit correction control is adopted. When there is sufficient reactive power, the bus voltage is pulled into the normal control range. When there is not enough reactive power, the bus voltage is reduced from exceeding the limit.

[0025] Another object of the present invention is to provide a system for a reactive power coordination control method of a new energy station, which can solve the reactive power coordination control problem of a new energy station by constructing a reactive power coordination control system of a new energy station.

[0026] In order to solve the above technical problems, the present invention provides the following technical solutions: a new energy station reactive power coordination control system, comprising an objective function construction module, a hierarchical control module, an adjustment module, an analysis module and a control module; the objective function construction module is used to collect new energy station data, construct an objective function, and set a penalty factor; the hierarchical control module is used to implement hierarchical and partitioned control, and set the substation terminal voltage and power factor to optimize the reactive voltage; the adjustment module 300 is used to predict and adjust the power station grid connection point voltage to maximize the capacity of the reactive power regulation equipment; the analysis module is used to establish a master-substation communication and data transmission system, and integrate a reactive voltage control platform for global analysis; the control module is used to divide the voltage control area and perform closed-loop control based on the reactive power objective function of the entire network.

[0027] A computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the reactive power coordinated control method of a new energy station are implemented.

[0028] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the reactive power coordinated control method of a new energy station as described above.

[0029] The beneficial effects of the present invention are as follows: the reactive power coordination control method provided by the present invention ensures that the voltage and power factor are qualified under the premise of meeting the safe and stable operation of the power grid, and reduces the active power loss of the system caused by unnecessary reactive power flow as much as possible; through the AVC system, the control model is obtained from the network analysis application, and the real-time acquisition data is obtained from the power grid steady-state monitoring application, and online analysis and calculation are performed, so that all load-regulating devices and reactive compensation equipment in each substation in the power grid are centrally monitored, uniformly managed and online controlled, so as to realize the closed-loop operation of the reactive voltage optimization control of the whole network. Based on the reactive voltage distribution characteristics of the new energy power plant and the current dispatching hierarchical management system, the present invention proposes a reactive voltage coordination control scheme based on automatic voltage control technology, and elaborates on the coordination control principle and implementation in detail. This method can effectively constrain the reactive power and voltage fluctuations of the new energy power plant, optimize the power grid flow, and realize the safe and economical operation of the power grid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0031] Figure 1 A flowchart of a reactive power coordinated control method for a new energy station is provided for the first embodiment of the present invention.

[0032] Figure 2 An overall architecture diagram of an AVC system for a reactive power coordinated control method for a new energy station provided in the first embodiment of the present invention.

[0033] Figure 3 A topology search flow chart of a reactive power coordinated control method for a new energy station provided in the first embodiment of the present invention.

[0034] Figure 4 A coordinated control flow chart of a reactive power coordinated control method for a new energy station provided in the first embodiment of the present invention.

[0035] Figure 5 A structural diagram of a reactive power coordination control system for a new energy station provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Example 1, reference Figure 1 to Figure 4 , which is the first embodiment of the present invention, and provides a method for coordinated reactive power control of a new energy station, including: collecting data of new energy stations, constructing an objective function, and setting a penalty factor; implementing hierarchical and partitioned control, and setting the substation terminal voltage and power factor to optimize the reactive voltage; predicting and adjusting the voltage at the power station grid connection point to maximize the capacity of the reactive power regulation equipment; establishing a master-substation communication and data transmission system, and integrating a reactive voltage control platform for global analysis; dividing the voltage control area, and performing closed-loop control based on the reactive power objective function of the entire network.

[0039] S1. Collect new energy station data, construct objective function, and set penalty factors.

[0040] S2. Implement hierarchical and partitioned control, set the substation voltage and power factor, and optimize reactive voltage.

[0041] S3. Predict and adjust the voltage at the power station grid connection point to maximize the capacity of the reactive power regulation equipment.

[0042] S4. Establish the master-substation communication and data transmission system and integrate the reactive power and voltage control platform for global analysis.

[0043] S5. Divide the voltage control area and perform closed-loop control based on the reactive power objective function of the entire network.

[0044] The voltage of the main network hub bus, the voltage of the photovoltaic power station grid connection point, the reactive power of the main network gateway and the reactive power of the booster station gateway are used as penalty functions, and the objective function is:

[0045]

[0046] Among them, ΔP ioss is the active network loss of the system, is the penalty function for the voltage exceeding the limit of the central busbar, n1 is the number of central buses in the system, is the penalty function for the voltage exceeding the limit of the high-voltage busbar on the booster station, n2 is the number of high-voltage busbars on the booster station, is the penalty function for the voltage exceeding the limit at the photovoltaic power station grid connection point, n3 is the number of buses at the photovoltaic power station grid connection point, The penalty function for the reactive power exceeding the limit of the main network interface, n4 is the number of main network interfaces, is the penalty function for reactive power exceeding the limit at the booster station checkpoint, and n5 is the number of booster station checkpoints.

[0047] The specific steps include:

[0048] Each penalty factor λ is an open parameter and is set according to the priority of each level of voltage, reactive power and network loss. The priority option has a larger penalty factor.

[0049] Adopting the mature hierarchical zoning and local balancing control concept of the traditional AVC system, the 110kV and below lines of wind farms and photovoltaic power stations connected to the main grid are divided into the regional power grid control area to participate in the regional reactive power voltage optimization. Figure 2 shown.

[0050] The master station sets the voltage control value or power factor of the grid-connected point at the substation according to the reactive power regulation capability and balance of each zone. The substations of wind farms and photovoltaic power stations reasonably control the wind turbines, photovoltaic inverters, centralized reactive power compensation devices and transformers according to the set voltage value, so that the voltage at the grid-connected point meets the control requirements.

[0051] By prejudging the reactive power demand and adjustable range of wind farms and photovoltaic power stations, the voltage setting value of the power station grid connection point is adjusted to give full play to the reactive power regulation capabilities of wind turbines and photovoltaic arrays.

[0052] Based on the power forecast of wind power and photovoltaic power stations, the slow discrete power regulation equipment, parallel capacitors, reactors and fast continuous reactive power regulation equipment are coordinated and controlled, and the static reactive power compensation devices of capacitors and reactors are controlled in advance.

[0053] On the basis of meeting the secondary protection requirements, the main station and substation systems achieve communication through the dispatching data network connection and realize seamless connection of data transmission through the construction of standardized interfaces.

[0054] All functional software of the master station should be integrated into the same platform to realize reactive voltage control of the cluster. The master station system should perform global analysis and calculation based on the global network model and real-time data, and try closed-loop control through hierarchical zoning. For wind farms and photovoltaic power stations, since the master station system issues voltage or power factor curves, the electric field is executed on-site to ensure that it does not have a negative impact on the reactive voltage of the main grid.

[0055] The master station divides the voltage control area according to the voltage level, and based on the reactive power objective function of the whole network, on the premise of ensuring the stability index and the optimal reactive power of the whole network, gives the set reference value and interconnection line information of the voltage amplitude of the central bus node of each control area. The calculation cycle is 10-60 minutes. The substation uses the available reactive power control equipment in the area, including SVC equipment, conventional unit AVR, and switchable capacitors, according to the set voltage reference value and adjustment amount to ensure that the central node voltage is near the set value. Each command control cycle is within 5 minutes.

[0056] The voltage and reactive power over-limit values ​​are:

[0057] ΔV i =V i -V imax (V i >V imax )

[0058] ΔV i =0(V i =V imax )

[0059] ΔV i =V imax- V i (V i <V imax )

[0060] ΔQ si =Q si -Q simax (Q si >Q simax )

[0061] ΔQ si =0(Q si =Q simax )

[0062] ΔQ si =Q simax -Q si (Q si <Q simax )

[0063] ΔQ di =Q di -Q dimax (Q di >Q dimax )

[0064] ΔQ di =0(Q di =Q dimax )

[0065] ΔQ di =Q dimax-Q di (Q di <Q dimax )

[0066] Where, ΔV i is the voltage difference of the ith bus, V i is the voltage value of the ith bus, V imax is the maximum voltage of the i-th bus, ΔQ si and Q simax are the reactive power value and the maximum reactive power of the ith main gateway port, Q di and Q dimax are the reactive power value and maximum reactive power of the i-th booster station respectively.

[0067] The substation should ensure that the voltage is qualified and consistent with the control direction of the secondary voltage control. The control target is controlled according to the topology type. If the booster station has a high-voltage side bus and can be topologically connected to the 330kV and 220kV main grid of the ground adjustment, the high-voltage side bus in the booster station is the control target. If the booster station does not have a high-voltage side bus or the high-voltage side bus cannot be measured, the high-voltage side bus of the booster station on the opposite line is searched through the topological relationship. Figure 3 shown.

[0068] After the topology search and zoning are completed, the master station first divides the network topology into zones according to the structure of the booster station outgoing lines connected to the regional power grid, and checks whether the control target voltage exceeds the limit. If the voltage exceeds the limit, over-limit correction control is adopted. If there is sufficient reactive power, the bus voltage is pulled into the normal control range. If there is not enough reactive power, the bus voltage is reduced to the maximum extent possible.

[0069] In the above description, when the control target does not exceed the limit, the secondary voltage control in the participating area adjusts the voltage according to the voltage situation in the area. The secondary voltage control strategy is mainly based on margin adjustment, and its calculation formula is:

[0070]

[0071] ∫ dn =1-∫ up

[0072] Among them, V c , V max , V min They are the current voltage, voltage upper limit and voltage lower limit respectively, Q c , Q max , Q min They are the current reactive power of all busbar units, the upper and lower limits of reactive power regulation of all busbar units, and Q vq is the margin weight of voltage to reactive power.

[0073] When the master station is executing regional reactive power control, it can sort the control targets according to the margin value to achieve sequence regulation so that the regulation effect is close to the optimal one.

[0074] When the regional voltage needs to be adjusted upward, the control bus voltage with a large upward adjustment margin is adjusted first, and the bus voltage with a small upward adjustment margin is temporarily kept at the original value. When the regional voltage needs to be adjusted downward, the control bus voltage with a large downward adjustment margin is adjusted first, and the bus voltage with a small downward adjustment margin is temporarily kept at the original value. When the regional voltage does not need to be adjusted, the adjustment direction of each control bus is determined according to the adjustment margin and adjusted accordingly. Figure 4 shown.

[0075] The present invention adopts an automatic voltage control AVC system in wind farms and photovoltaic power stations to adjust the voltage and reactive power of the grid-connected point. The AVC system can accept the limit settings of the bus voltage and total reactive power from the dispatcher and the bus voltage and reactive power settings in the power station. Through a certain strategy, the reactive power of the grid-connected wind turbine, the reactive power of the photovoltaic inverter, the input amount of the reactive compensator or the transformation ratio of the substation step-up transformer is adjusted to adjust the reactive power and voltage of the power station, so that the voltage at the grid-connected point is within the normal operating range.

[0076] Example 2, reference Figure 5 , which is the second embodiment of the present invention, is different from the previous embodiment in that it provides a new energy station reactive power coordination control system, including: an objective function construction module 100, a hierarchical control module 200, an adjustment module 300, an analysis module 400 and a control module 500.

[0077] The objective function construction module 100 is used to collect new energy station data, construct an objective function, and set a penalty factor.

[0078] The hierarchical control module 200 is used to implement hierarchical and partitioned control, set the substation terminal voltage and power factor, and optimize the reactive voltage.

[0079] The regulation module 300 is used to predict and regulate the voltage at the power station grid connection point, and to maximize the capacity of the reactive power regulation equipment.

[0080] The analysis module 400 is used to establish a master-substation communication and data transmission system and integrate a reactive power voltage control platform for global analysis.

[0081] The control module 500 is used to divide the voltage control area and perform closed-loop control based on the reactive power objective function of the entire network.

[0082] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0083] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0084] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0085] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0086] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A reactive power coordination control method for a new energy station, characterized in that: include, Collect new energy station data, build objective functions, and set penalty factors; Implement hierarchical and zoned control, set substation terminal voltage and power factor, and optimize reactive voltage; Predict and adjust the voltage at the power station grid connection point to maximize the capacity of reactive power regulation equipment; Establish master-substation communication and data transmission system, and integrate reactive power and voltage control platform for global analysis; Divide the voltage control area and perform closed-loop control based on the reactive power objective function of the entire network.

2. A reactive power coordinated control method for a new energy station as claimed in claim 1, characterized in that: The objective function includes the voltage of the main network hub bus, the voltage of the photovoltaic power station grid connection point, the reactive power of the main network gateway and the reactive power of the booster station gateway as the penalty function. The objective function is expressed as: Among them, ΔP ioss is the active network loss of the system, is the penalty function for the voltage exceeding the limit of the central busbar, n1 is the number of central buses in the system, is the penalty function for the voltage exceeding the limit of the high-voltage busbar on the booster station, n2 is the number of high-voltage busbars on the booster station, is the penalty function for the voltage exceeding the limit at the photovoltaic power station grid connection point, n3 is the number of buses at the photovoltaic power station grid connection point, The penalty function for the reactive power exceeding the limit of the main network interface, n4 is the number of main network interfaces, is the penalty function for reactive power exceeding the limit at the booster station checkpoint, and n5 is the number of booster station checkpoints.

3. A reactive power coordination control method for a new energy station as claimed in claim 2, characterized in that: The penalty factors include penalty factors λ which are open parameters and are set according to the priority of each level of voltage, reactive power and network loss. The priority option has a large penalty factor.

4. A reactive power coordinated control method for a new energy station as claimed in claim 3, characterized in that: The hierarchical zoning control includes the division of the parts of wind farms and photovoltaic power stations with 110kV and below lines connected to the main grid into the regional power grid control area, participating in the regional reactive power voltage optimization; The master station sets the voltage control value or power factor of the grid-connected point at the substation according to the reactive power regulation capability and balance of each zone. The substations of wind farms and photovoltaic power stations reasonably control the wind turbines, photovoltaic inverters, centralized reactive power compensation devices and transformers according to the set voltage value, so that the voltage at the grid-connected point meets the control requirements.

5. A reactive power coordinated control method for a new energy station as claimed in claim 4, characterized in that: The pre-judgment and adjustment of the voltage at the power station grid connection point includes adjusting the voltage setting value at the power station grid connection point by pre-judgment of the reactive power demand and adjustable range of the wind farm and the photovoltaic power station; Based on the power forecast of wind power and photovoltaic power stations, the slow discrete reactive power regulation equipment, parallel capacitors, reactors and fast continuous reactive power regulation equipment are coordinated and controlled, and the static reactive power compensation device of capacitors and reactors is controlled in advance; The establishment of the master-substation communication and data transmission system includes the master station and the substation system achieving communication through a dispatching data network connection on the basis of meeting the secondary protection requirements, and achieving seamless connection of data transmission through the construction of standardized interfaces; All functional software of the master station should be integrated into the same platform to realize reactive power and voltage control of the cluster. The master station system should perform global analysis and calculation based on the global network model and real-time data, and implement closed-loop control through hierarchical partitioning. The master station divides the voltage control area according to the voltage level, and based on the reactive power objective function of the whole network, on the premise of ensuring the stability index and the optimal reactive power of the whole network, gives the set reference value and interconnection line information of the voltage amplitude of the central bus node of each control area. The substation controls the reactive power of the available equipment in the area, including SVC equipment, conventional unit AVR, and switchable capacitors, according to the set voltage reference value and adjustment amount.

6. A reactive power coordination control method for a new energy station as claimed in claim 5, characterized in that: The over-limit values ​​of voltage and reactive power are expressed as: ΔV i =V i -V imax (V i >V imax ) ΔV i＝0 (V i =V imax ) ΔV i =V imax -V i (V i <V imax ) ΔQ si =Q si -Q simax (Q si >Q simax ) ΔQ si＝0 (Q si =Q simax ) ΔQ si =Q simax- Q si (Q si <Q simax ) ΔQ di =Q di -Q dimax (Q di >Q dimax ) ΔQ di＝0 (Q di =Q dimax ) ΔQ di =Q dimax -Q di (Q di <Q dimax ) Where, ΔV i is the voltage difference of the ith bus, V i is the voltage value of the ith bus, V imax is the maximum voltage of the i-th bus, ΔQ si and Q simax are the reactive power value and the maximum reactive power of the ith main gateway port, Q di and Q dimax are the reactive power value and maximum reactive power of the i-th booster station respectively.

7. A reactive power coordination control method for a new energy station as claimed in claim 6, characterized in that: The substation includes a substation to ensure that the voltage is qualified, which is consistent with the control direction of the secondary voltage control. The control target is controlled according to the topology type. If the booster station has a high-voltage side bus and the topology is to the 330kV and 220kV main grid of the ground adjustment, the high-voltage side bus in the booster station is the control target. If the booster station does not have a high-voltage side bus or the high-voltage side bus cannot collect measurements, the high-voltage side bus of the booster station of the opposite line is searched through the topological relationship; After the topology search and zoning are completed, the master station will partition the network based on the network topology technology according to the structure of the substation outgoing line connected to the regional power grid to check whether the control target voltage exceeds the limit. If the voltage exceeds the limit, over-limit correction control will be adopted to bring the bus voltage into the normal control range if there is sufficient reactive power. If there is not enough reactive power, the bus voltage will be reduced from exceeding the limit.

8. A system using a reactive power coordinated control method for a new energy station as claimed in any one of claims 1 to 7, characterized in that: It includes an objective function building module (100), a hierarchical control module (200), an adjustment module (300), an analysis module (400) and a control module (500); The objective function construction module (100) is used to collect new energy station data, construct an objective function, and set a penalty factor; The hierarchical control module (200) is used to implement hierarchical and partitioned control, set the substation terminal voltage and power factor, and optimize the reactive voltage; The regulating module (300) is used to predict and regulate the voltage at the power station grid connection point, so as to maximize the capacity of the reactive power regulating equipment; The analysis module (400) is used to establish a master-substation communication and data transmission system, and integrate a reactive voltage control platform to perform global analysis; The control module (500) is used to divide the voltage control area and perform closed-loop control based on the reactive power target function of the entire network.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a reactive power coordinated control method for a new energy station according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a reactive power coordinated control method for a new energy station according to any one of claims 1 to 7 are implemented.

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