Voltage control method and device for new energy grid-connected area and storage medium

Abstract

The invention discloses a voltage control method and device for a new energy grid-connected region and a storage medium, and the method comprises the steps: constructing an energy storage power station collection region, and bringing the plant stations of an energy storage power station into the energy storage power station collection region; constructing charging voltage constraints and discharging voltage constraints of all stations; in the collection period, if the sum of all outgoing line active values of the energy storage power stations in the energy storage power station collection area is smaller than a preset value, the current voltage constraint is switched into the charging voltage constraint; if the sum of the active values of all outgoing lines of the energy storage power stations in the energy storage power station collection area is greater than or equal to a preset value, switching the current voltage constraint into a discharge voltage constraint; constructing a quadratic programming model based on the current voltage constraint; and solving the quadratic programming model to obtain the minimum variable quantity of the wind power equivalent machine, and performing voltage control on the energy storage power station according to the minimum variable quantity of the wind power equivalent machine. The voltage control requirements of the energy storage power station in different operation states can be met, and the voltage control effect of the energy storage power station is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of voltage control technology, and in particular to a voltage control method, device and storage medium for a new energy grid-connected area. Background Art

[0002] Solar photovoltaic power generation is one of the important components of achieving my country's energy and electricity sustainable development strategy. Since photovoltaic output power is highly volatile and random, the instability of photovoltaic power seriously restricts the access and transmission of photovoltaic power. Energy storage technology can achieve functions such as peak shaving and valley filling, load tracking, frequency and voltage regulation, and power quality management. The photovoltaic energy storage system can also store excess electricity in the energy storage battery when the photovoltaic power station encounters power generation restrictions due to abandoned light. When the photovoltaic power generation is lower than the limit value or the peak power consumption at night, the energy in the battery is sent to the power grid through the energy storage inverter. The energy storage system participates in the peak shaving and valley filling of the power grid. The energy storage system can also use the peak-valley electricity price difference to create greater economic benefits, improve the system's own regulation ability, and can serve as an effective supporting technology for solving the problem of large-scale renewable energy power generation access to the power grid.

[0003] The existing voltage control methods in renewable energy grid-connected areas are usually unable to meet the voltage control requirements of energy storage power stations under different operating conditions, resulting in poor voltage control effects. Summary of the invention

[0004] The present invention provides a voltage control method, device and storage medium for a new energy grid-connected area to solve the technical problem that the existing voltage control method for a new energy grid-connected area is usually difficult to meet the voltage control requirements of an energy storage power station under different operating conditions, resulting in poor voltage control effect.

[0005] The present invention provides a voltage control method for a new energy grid-connected area, comprising:

[0006] Construct an energy storage power station collection area, and include the power plants on the energy storage power stations into the energy storage power station collection area; wherein the power plants include the substations on the energy storage power stations and the new energy stations directly connected to the energy storage power stations;

[0007] Constructing charging voltage constraints and discharging voltage constraints of all the plants;

[0008] During the collection period, if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value, the current voltage constraint is switched to a charging voltage constraint; if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to the preset value, the current voltage constraint is switched to a discharging voltage constraint;

[0009] Building a quadratic programming model based on the current voltage constraint;

[0010] The quadratic programming model is solved to obtain the minimum change amount of the wind power equivalent machine, and the voltage of the energy storage power station is controlled according to the minimum change amount of the wind power equivalent machine.

[0011] Furthermore, the charging voltage constraint is:

[0012]

[0013] in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus;

[0014] The discharge voltage constraint is:

[0015]

[0016] in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

[0017] Furthermore, the voltage control method of the new energy grid-connected area also includes:

[0018] The objective function of the quadratic programming model is constructed according to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine.

[0019] Furthermore, the constraints of the quadratic programming model include:

[0020] Voltage constraints on the main transformer high-voltage side busbars of the energy storage power stations and other new energy stations in the energy storage power station collection area;

[0021] 220kV bus voltage constraints of the grid-connected substations in the energy storage power station collection area;

[0022] Equivalent generator reactive power constraints of each station in the energy storage power station collection area.

[0023] Furthermore, the voltage control of the energy storage power station according to the minimum change amount of the wind power equivalent machine includes:

[0024] The minimum change amount of the wind power equivalent machine is used as the reactive power adjustment amount and sent to the voltage control substation, so that the voltage control substation adjusts the reactive power according to the reactive power adjustment amount to control the voltage of the energy storage power station within the target voltage range.

[0025] The present invention also provides a voltage control device for a new energy grid-connected area, comprising:

[0026] An energy storage power station collection area construction module is used to construct an energy storage power station collection area and incorporate the power stations on the energy storage power station into the energy storage power station collection area; wherein the power stations include the substations on the energy storage power station and the new energy stations directly connected to the energy storage power station;

[0027] A voltage constraint building module, used to build charging voltage constraints and discharging voltage constraints of all the plants;

[0028] A voltage constraint switching module is used to switch the current voltage constraint to a charging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value during a collection period; and to switch the current voltage constraint to a discharging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to the preset value;

[0029] A quadratic programming model building module, used to build a quadratic programming model based on the current voltage constraint;

[0030] The energy storage power station voltage control module is used to solve the quadratic programming model to obtain the minimum change of the wind power equivalent machine, and perform voltage control on the energy storage power station according to the minimum change of the wind power equivalent machine.

[0031] Furthermore, the charging voltage constraint is:

[0032]

[0033] in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus;

[0034] The discharge voltage constraint is:

[0035]

[0036] in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

[0037] Furthermore, the quadratic programming model building module is also used for:

[0038] The objective function of the quadratic programming model is constructed according to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine.

[0039] The present invention also provides a terminal device, comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the voltage control method for the new energy grid-connected area as described above is implemented.

[0040] The present invention also provides a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the voltage control method for the new energy grid-connected area as described above.

[0041] The present invention automatically switches the voltage constraints of all power plants in the energy storage power station gathering area according to the comparison result of the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area and a small preset value, so that when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is a negative number, it is a charging voltage constraint, and when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is not a negative number, it is a discharging constraint, thereby being able to meet the voltage control requirements of the energy storage power station in different operating states and improve the voltage control effect of the energy storage power station;

[0042] Furthermore, the present invention constructs a quadratic programming model based on the switched voltage constraint, and solves the quadratic programming model to obtain the minimum change of the wind power equivalent machine for controlling the voltage, thereby further improving the voltage control effect of the energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of a voltage control method for a new energy grid-connected area provided by an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of a power grid structure provided by an embodiment of the present invention;

[0045] Figure 3 It is a structural schematic diagram of a voltage control device in a new energy grid-connected area provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] See also Figure 1 The present invention provides a voltage control method for a new energy grid-connected area, comprising:

[0050] S1. Construct an energy storage power station gathering area and include the power plants on the energy storage power station into the energy storage power station gathering area; the power plants include the substations on the energy storage power station and the new energy stations directly connected to the energy storage power station;

[0051] In the embodiment of the present invention, the energy storage power station collection area is:

[0052] Z i ={S j}, j = 1…J

[0053] Among them, Z i It is the energy storage power station collection area, S j It is the jth station.

[0054] In the embodiment of the present invention, the plant stations on the energy storage power station can be included in the energy storage power station collection area to obtain a more complete energy storage power station collection area.

[0055] S2. Construct charging voltage constraints and discharging voltage constraints for all plants and stations;

[0056] The embodiment of the present invention repeats steps S1-S2 to complete the construction of all energy storage power station collection areas.

[0057] S3. During the collection period, if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value, the current voltage constraint is switched to a charging voltage constraint; if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to a preset value, the current voltage constraint is switched to a discharging voltage constraint;

[0058] In the embodiment of the present invention, the preset value may be 0. That is, when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is less than 0, if the current voltage constraint is not a charging voltage constraint, it is switched to a charging voltage constraint; when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is greater than or equal to 0, if the current voltage constraint is not a discharging voltage constraint, the current voltage constraint is switched to a discharging voltage constraint.

[0059] S4. Construct a quadratic programming model based on the current voltage constraint;

[0060] In the embodiment of the present invention, based on the current voltage constraint, the relevant parameters for constructing the quadratic programming model are determined according to the busbars and units of each plant in the energy storage power station collection area. For example, according to the busbars and units of each plant in the energy storage power station collection area, the actual value of the total reactive power of the energy storage power station is determined, so as to construct the objective function of the quadratic programming model, so as to construct the final quadratic programming model.

[0061] S5. Solve the quadratic programming model to obtain the minimum change of the wind power equivalent machine, and control the voltage of the energy storage power station according to the minimum change of the wind power equivalent machine.

[0062] In the embodiment of the present invention, the minimum change amount of the wind power equivalent machine is used as a control instruction and sent to the energy storage power station and the AVC substation of the directly connected new energy station. Each AVC substation completes the reactive power regulation in the corresponding plant. By adjusting the reactive power of the energy storage power station, the voltage of the energy storage power station can be accurately controlled so that the voltage of the energy storage power station is within the target voltage range.

[0063] According to the comparison result of the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area and the small preset value, the embodiment of the present invention automatically switches the voltage constraints of all power stations in the energy storage power station gathering area, so that when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is less than 0, it is a charging voltage constraint, and when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is greater than or equal to 0, it is a discharging constraint, thereby being able to meet the voltage control requirements of the energy storage power station in different operating states and improve the voltage control effect of the energy storage power station;

[0064] Furthermore, the embodiment of the present invention constructs a quadratic programming model based on the switched voltage constraint, and solves the quadratic programming model to obtain the minimum change of the wind power equivalent machine for controlling the voltage, thereby further improving the voltage control effect of the energy storage power station.

[0065] In one embodiment, the charging voltage constraint is:

[0066]

[0067] in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus;

[0068] The discharge voltage constraint is:

[0069]

[0070] in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

[0071] In one embodiment, step S3, during the collection period, if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value, the current voltage constraint is switched to a charging voltage constraint; if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to the preset value, the current voltage constraint is switched to a discharging voltage constraint, further comprising:

[0072] When the collection cycle arrives, calculate the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area P ln :

[0073]

[0074] Where L is the number of high-voltage outgoing lines of the energy storage power station, P l is the measured value of active power of each outgoing line. ln <0, the current voltage is constrained to V lmt Switch to charging voltage constraint:

[0075]

[0076] If P ln ≥0, the current voltage is constrained to V lmt Switch to discharge voltage constraint:

[0077]

[0078] The embodiment of the present invention repeats step S3 until the voltage constraint switching of all energy storage power station collection areas is completed.

[0079] In one embodiment, the voltage control method in the new energy grid-connected area further includes:

[0080] According to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine, the objective function of the quadratic programming model is constructed.

[0081] In the embodiment of the present invention, the voltage constraint of the quadratic programming model may be the voltage constraint of step S3, wherein the objective function is:

[0082]

[0083] Among them, Gate q is the actual value of the total reactive power of all outgoing lines of the energy storage power station, It is the total reactive power target value of all outgoing lines of the energy storage power station, which is generally 0. As a goal, calculate the minimum change ΔQ of the wind power equivalent machine g , parameter Θ g is the reactive power balance target part of each wind farm in the energy storage power station collection area, W p , W q They are the voltage control target weight coefficient and the reactive source balance control target weight coefficient respectively.

[0084] In one embodiment, the constraints of the quadratic programming model include:

[0085] The voltage constraints of the main transformer high-voltage side busbars of the energy storage power stations and other new energy stations in the energy storage power station collection area;

[0086] 220kV bus voltage constraints of the grid-connected substations in the energy storage power station collection area;

[0087] Equivalent generator reactive power constraints at each station in the energy storage power station collection area.

[0088] In the embodiment of the present invention, the constraints of the quadratic programming model are:

[0089]

[0090] Among them, C1 represents Z i The main transformer high-voltage side bus voltage constraint of the energy storage power station and other new energy stations, C2 represents Z i The 220kV bus voltage constraint of the grid-connected substation, C1 and C2 both use the voltage constraint of step S3, and C3 represents Z i When the equivalent generator reactive power constraints of each station, C lg , C hg , C sg , C pg is the sensitivity matrix.

[0091] The embodiment of the present invention sets the main transformer high-voltage side bus voltage constraint and the 220kV bus voltage constraint based on the voltage constraint condition of step S3, and can accurately control the main transformer high-voltage side bus voltage of the energy storage power station and other new energy sites, as well as the 220kV bus voltage of the grid-connected substation, which is beneficial to maintaining the grid voltage within a safe and stable range; by setting the reactive power constraint of the equivalent generator, it can ensure that the reactive power adjustment does not exceed the reactive power limit of the generator, thereby helping to optimize the resource allocation of the energy storage power station and other new energy sites and improve the overall efficiency of the grid.

[0092] In one embodiment, voltage control of an energy storage power station is performed according to a minimum change amount of a wind power equivalent machine, including:

[0093] The minimum change of the wind power equivalent machine is used as the reactive power adjustment amount and sent to the voltage control substation, so that the voltage control substation adjusts the reactive power according to the reactive power adjustment amount to control the voltage of the energy storage power station within the target voltage range.

[0094] In the embodiment of the present invention, the minimum change amount of the wind power equivalent machine is the reactive power adjustment amount, which is the reactive power amount that the energy storage power station needs to adjust in order to achieve the voltage control target. For example, increasing the reactive power output can increase the voltage level, while reducing the reactive power output can reduce the voltage level. Therefore, by adjusting the reactive power, the purpose of voltage control can be achieved.

[0095] The embodiment of the present invention obtains the minimum change of the wind power equivalent machine by solving the quadratic programming model, so that the reactive power of the energy storage power station can be adjusted according to the minimum change of the wind power equivalent machine, and then the voltage control of the energy storage power station can be realized according to actual needs, effectively improving the voltage control effect of the energy storage power station.

[0096] See also Figure 2 In one embodiment, a 220kV energy storage collection area is taken as an example to perform voltage control of the energy storage power station. The 220kV energy storage collection area includes a 220kV energy collection station, a photovoltaic power station and an energy storage power station. A certain energy storage station has two equivalent generators, and a certain photovoltaic power station has two equivalent generators.

[0097] In the embodiment of the present invention, the control period of the energy storage collection area is set to 1 minute, and the data collection period is set to 30 seconds.

[0098] S10. For the three 220kV buses in the 220kV energy storage collection area, establish charging constraint and discharging constraint models:

[0099]

[0100] S20. When the collection cycle arrives, calculate the total active value of all outgoing lines of a certain energy storage power station:

[0101] P ln =P1+P2=25.00+25.00=50MW

[0102] Because P ln >0, then set the current voltage constraint

[0103] S30, when the calculation cycle arrives, a secondary programming model is constructed for the 220kV energy storage collection area. The voltage constraints of each bus in the collection area are set to V lmt ,Right now:

[0104]

[0105] S40, solving the quadratic programming model, and sending the calculated voltage command on the high-voltage side of the main transformer of the energy storage power station to the substation for execution, so as to control the voltage of the energy storage power station.

[0106] The implementation of the embodiments of the present invention has the following beneficial effects:

[0107] According to the comparison result of the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area and the small preset value, the embodiment of the present invention automatically switches the voltage constraints of all power stations in the energy storage power station gathering area, so that when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is less than 0, it is a charging voltage constraint, and when the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station gathering area is greater than or equal to 0, it is a discharging constraint, thereby being able to meet the voltage control requirements of the energy storage power station in different operating states and improve the voltage control effect of the energy storage power station;

[0108] Furthermore, the embodiment of the present invention constructs a quadratic programming model based on the switched voltage constraint, and solves the quadratic programming model to obtain the minimum change of the wind power equivalent machine for controlling the voltage, thereby further improving the voltage control effect of the energy storage power station.

[0109] See also Figure 3 Based on the same inventive concept as the above embodiment, the present invention also provides a voltage control device for a new energy grid-connected area, comprising:

[0110] The energy storage power station collection area construction module 10 is used to construct the energy storage power station collection area and include the power stations on the energy storage power station into the energy storage power station collection area; wherein the power stations include the substations on the energy storage power station and the new energy stations directly connected to the energy storage power station;

[0111] A voltage constraint building module 20 is used to build charging voltage constraints and discharging voltage constraints of all power plants;

[0112] The voltage constraint switching module 30 is used to switch the current voltage constraint to a charging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value during the collection period; and to switch the current voltage constraint to a discharging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to a preset value;

[0113] A quadratic programming model building module 40, used to build a quadratic programming model based on the current voltage constraint;

[0114] The energy storage power station voltage control module 50 is used to solve the quadratic programming model, obtain the minimum change amount of the wind power equivalent machine, and control the voltage of the energy storage power station according to the minimum change amount of the wind power equivalent machine.

[0115] In one embodiment, the charging voltage constraint is:

[0116]

[0117] in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus;

[0118] The discharge voltage constraint is:

[0119]

[0120] in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

[0121] Furthermore, the quadratic programming model building module 40 is also used for:

[0122] According to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine, the objective function of the quadratic programming model is constructed.

[0123] Correspondingly, an embodiment of the present invention also provides a terminal device, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the voltage control method of the new energy grid-connected area of ​​any one of the above embodiments.

[0124] The terminal device of this embodiment includes: a processor, a memory, and a computer program and computer instructions stored in the memory and executable on the processor. When the processor executes the computer program, each step in the above embodiment 1 is implemented, for example Figure 1Alternatively, when the processor executes the computer program, the functions of each module / unit in the above device embodiment, such as the voltage constraint switching module 30, are implemented.

[0125] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in a memory and executed by a processor to complete the present invention. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device. For example, the voltage constraint switching module 30 is used to switch the current voltage constraint to a charging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value during the acquisition cycle; if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to a preset value, the current voltage constraint is switched to a discharge voltage constraint.

[0126] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or may combine certain components, or different components. For example, the terminal device may also include an input / output device, a network access device, a bus, etc.

[0127] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0128] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile terminal, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (F l ash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0129] Among them, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0130] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the voltage control method of the new energy grid-connected area of ​​any one of the above embodiments.

[0131] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A voltage control method for a new energy grid-connected area, characterized in that: include: Construct an energy storage power station collection area, and include the power plants on the energy storage power stations into the energy storage power station collection area; wherein the power plants include the substations on the energy storage power stations and the new energy stations directly connected to the energy storage power stations; Constructing charging voltage constraints and discharging voltage constraints of all the plants; During the collection period, if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value, the current voltage constraint is switched to a charging voltage constraint; if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to the preset value, the current voltage constraint is switched to a discharging voltage constraint; Building a quadratic programming model based on the current voltage constraint; The quadratic programming model is solved to obtain the minimum change amount of the wind power equivalent machine, and the voltage of the energy storage power station is controlled according to the minimum change amount of the wind power equivalent machine.

2. The voltage control method for a new energy grid-connected area according to claim 1, characterized in that: The charging voltage constraint is: in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus; The discharge voltage constraint is: in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

3. The voltage control method for a new energy grid-connected area according to claim 1, characterized in that: Also includes: The objective function of the quadratic programming model is constructed according to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine.

4. The voltage control method for a new energy grid-connected area according to claim 1, characterized in that: The constraints of the quadratic programming model include: Voltage constraints on the main transformer high-voltage side busbars of the energy storage power stations and other new energy stations in the energy storage power station collection area; 220kV bus voltage constraints of the grid-connected substations in the energy storage power station collection area; Equivalent generator reactive power constraints of each station in the energy storage power station collection area.

5. The voltage control method for a new energy grid-connected area according to claim 1, characterized in that: The voltage control of the energy storage power station according to the minimum change amount of the wind power equivalent machine includes: The minimum change amount of the wind power equivalent machine is used as the reactive power adjustment amount and sent to the voltage control substation, so that the voltage control substation adjusts the reactive power according to the reactive power adjustment amount to control the voltage of the energy storage power station within the target voltage range.

6. A voltage control device for a new energy grid-connected area, characterized in that: include: An energy storage power station collection area construction module is used to construct an energy storage power station collection area and incorporate the power stations on the energy storage power station into the energy storage power station collection area; wherein the power stations include the substations on the energy storage power station and the new energy stations directly connected to the energy storage power station; A voltage constraint building module, used to build charging voltage constraints and discharging voltage constraints of all the plants; A voltage constraint switching module is used to switch the current voltage constraint to a charging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is less than a preset value during a collection period; and to switch the current voltage constraint to a discharging voltage constraint if the sum of all outgoing active values ​​of the energy storage power stations in the energy storage power station collection area is greater than or equal to the preset value; A quadratic programming model building module, used to build a quadratic programming model based on the current voltage constraint; The energy storage power station voltage control module is used to solve the quadratic programming model to obtain the minimum change of the wind power equivalent machine, and perform voltage control on the energy storage power station according to the minimum change of the wind power equivalent machine.

7. The voltage control device for the new energy grid-connected area according to claim 6, characterized in that: The charging voltage constraint is: in, represents the upper limit of the charging voltage constraint of the nth bus, where Indicates the lower limit of the charging voltage constraint of the nth bus; The discharge voltage constraint is: in, represents the upper limit of the discharge voltage constraint of the nth bus, where Represents the lower limit of the discharge voltage constraint of the nth bus.

8. The voltage control device for the new energy grid-connected area according to claim 6, characterized in that: The quadratic programming model building module is also used to: The objective function of the quadratic programming model is constructed according to the actual value of the total reactive power of the energy storage power station, the target value of the total reactive power of the energy storage power station and the minimum change of the wind power equivalent machine.

9. A terminal device, characterized in that: include: A processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the voltage control method for the new energy grid-connected area as described in any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program; wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the voltage control method for the new energy grid-connected area as described in any one of claims 1-5.

Images