CN113725874A - Power grid oscillation suppression method and device, energy storage power station control equipment and storage medium - Google Patents
Power grid oscillation suppression method and device, energy storage power station control equipment and storage medium Download PDFInfo
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- CN113725874A CN113725874A CN202111026673.0A CN202111026673A CN113725874A CN 113725874 A CN113725874 A CN 113725874A CN 202111026673 A CN202111026673 A CN 202111026673A CN 113725874 A CN113725874 A CN 113725874A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The application provides a power grid oscillation suppression method and device, energy storage power station control equipment and a storage medium, and relates to the technical field of power system management. According to the method and the device, the power grid frequency deviation value when the target power grid generates low-frequency oscillation is determined, and under the condition that the target energy storage power station meets the oscillation suppression scheduling condition is detected, the maximum charging and discharging power constraint based on the power grid frequency deviation value and the target energy storage power station is calculated, the current power adjustment value of the target energy storage power station for the target power grid is calculated, then the target energy storage power station is controlled to adjust the active power of the target power grid according to the power adjustment value, so that the active power of the power grid is adjusted by utilizing the charging and discharging characteristics of the energy storage power station, the low-frequency oscillation of the power grid is effectively suppressed, and the power grid system is gradually restored to a normal operation state.
Description
Technical Field
The application relates to the technical field of power system management, in particular to a power grid oscillation suppression method and device, energy storage power station control equipment and a storage medium.
Background
With the continuous development of the power technology, the new energy power generation technology is gradually matured, and the existing power grid system starts to introduce a new energy power generation mode, but the new energy power generation mode is extremely unfriendly to the stable operation of the power grid system due to strong volatility, high uncertainty and weak frequency modulation. The application ratio of the new energy power generation in the power grid system is further improved, so that the power grid system is more prone to low-frequency oscillation, and the operation stability of the power grid system is affected.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and an apparatus for suppressing grid oscillation, an energy storage power station control device, and a storage medium, which can effectively suppress grid low-frequency oscillation by using charge and discharge characteristics of an energy storage power station, so that a grid system gradually recovers to a normal operating state.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, the present application provides a method for suppressing grid oscillation, the method including:
determining a current power grid frequency deviation value of a target power grid under the condition that the target power grid generates low-frequency oscillation;
detecting whether a target energy storage power station meets an oscillation suppression scheduling condition currently or not according to the power grid frequency deviation value, wherein the target energy storage power station is connected with the target power grid;
under the condition that the target energy storage power station is detected to meet oscillation suppression scheduling conditions, calculating a current power adjustment value of the target energy storage power station for a target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station;
and controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
In an optional embodiment, the step of determining the current grid frequency deviation value of the target grid includes:
acquiring a reference power grid frequency value of the target power grid and a current actual power grid frequency value of the target power grid;
and calculating a difference value between the actual power grid frequency value and the reference power grid frequency value to obtain the power grid frequency deviation value.
In an optional implementation manner, the step of detecting whether the target energy storage power station currently meets the oscillation suppression scheduling condition according to the power grid frequency deviation value includes:
the power grid frequency deviation value is compared with a preset frequency deviation range;
and if the power grid frequency deviation value is within the preset frequency deviation range, judging that the target energy storage power station does not meet the oscillation suppression scheduling condition currently, and otherwise, judging that the target energy storage power station meets the oscillation suppression scheduling condition.
In an optional embodiment, the step of calculating a current power adjustment value of the target energy storage power station for the target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station includes:
calculating the current operation adjusting power value of the target energy storage power station aiming at the target power grid according to the droop control coefficient, the integral control coefficient, the inertia control time constant and the power grid frequency deviation value of the target energy storage power station;
and carrying out power amplitude limiting processing on the operation adjusting power value according to the maximum charge and discharge power value to obtain the power adjusting value, wherein the absolute value of the power adjusting value is smaller than or equal to the absolute value of the maximum charge and discharge power value.
In an alternative embodiment, the calculation process of the operation adjustment power value is expressed by the following equation:
wherein Δ ω is used to represent the grid frequency deviation value, PBFor representing said operating regulation power value, KiFor indicating the droop control coefficient, KpFor representing said integral control coefficient, TwFor representing the inertial control time constant,
for representing the time-domain integral, T, of the droop control coefficientws is used to represent the time-domain differential to the inertial control time constant.
In an optional implementation manner, the step of controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value includes:
detecting whether the power adjustment value is a positive number;
under the condition that the power adjustment value is detected to be a positive number, controlling the target energy storage power station to perform power injection operation on the active power of the target power grid according to the power adjustment value;
and under the condition that the power adjustment value is detected to be a negative number, controlling the target energy storage power station to perform power absorption operation on the active power of the target power grid according to the absolute value of the power adjustment value.
In an alternative embodiment, the method further comprises:
and controlling the target energy storage power station not to adjust the active power of the target power grid under the condition that the target energy storage power station is detected not to meet the oscillation suppression scheduling condition.
In a second aspect, the present application provides a grid oscillation suppression apparatus, the apparatus comprising:
the frequency deviation determining module is used for determining a current power grid frequency deviation value of a target power grid under the condition that the target power grid generates low-frequency oscillation;
the energy storage scheduling detection module is used for detecting whether a target energy storage power station meets an oscillation suppression scheduling condition or not according to the power grid frequency deviation value, wherein the target energy storage power station is connected with the target power grid;
the power adjustment calculation module is used for calculating a current power adjustment value of the target energy storage power station aiming at a target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station under the condition that the target energy storage power station is detected to meet the oscillation suppression scheduling condition;
and the energy storage power station control module is used for controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
In an optional embodiment, the energy storage power station control module is further configured to control the target energy storage power station not to adjust the active power of the target power grid when it is detected that the target energy storage power station does not satisfy the oscillation suppression scheduling condition.
In a third aspect, the present application provides an energy storage power station control device, comprising a processor and a memory, wherein the memory stores a computer program executable by the processor, and the processor can execute the computer program to implement the grid oscillation suppression method according to any one of the foregoing embodiments.
In a fourth aspect, the present application provides a storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the grid oscillation suppression method according to any one of the preceding embodiments.
In this case, the beneficial effects of the embodiments of the present application include the following:
this application is determining the electric wire netting frequency deviation value when the target electric wire netting produces the low frequency oscillation, and under the condition that detects target energy storage power station and satisfies the vibration and restrain the dispatch condition, will regard as the restraint with the biggest charge-discharge power value of target energy storage power station based on electric wire netting frequency deviation value, calculate this target energy storage power station current power adjustment value to the target electric wire netting, control target energy storage power station then and adjust the active power of target electric wire netting according to power adjustment value, so that utilize the charge-discharge characteristic of energy storage power station to adjust electric wire netting active power, make electric wire netting low frequency oscillation obtain effective suppression, let the electric wire netting system resume normal operating condition gradually.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic composition diagram of an energy storage power station control device provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a power grid oscillation suppression method according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating the sub-steps included in step S240 in FIG. 2;
fig. 4 is a second schematic flowchart of a grid oscillation suppression method according to an embodiment of the present application;
fig. 5 is a schematic composition diagram of a grid oscillation suppression device according to an embodiment of the present application.
Icon: 10-energy storage power station control equipment; 11-a memory; 12-a processor; 13-a communication unit; 100-grid oscillation suppression means; 110-a frequency deviation determination module; 120-energy storage scheduling detection module; 130-a power adjustment calculation module; 140-energy storage power station control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be understood that relational terms such as the terms first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an energy storage plant control apparatus 10 according to an embodiment of the present disclosure. In this embodiment, the energy storage power station control device 10 is configured to control an operation status of the energy storage power station, so that the energy storage power station performs charging and discharging operations on a connected power grid system, and when the power grid system has low-frequency oscillation, the energy storage power station adjusts active power of the power grid system, so that the low-frequency oscillation of the power grid is effectively suppressed, and the power grid system can gradually return to a normal operation state. The energy storage power station control device 10 may be, but is not limited to, a smart phone, a tablet computer, a personal computer, a server, and the like.
In this embodiment, the energy storage plant control apparatus 10 may include a memory 11, a processor 12, a communication unit 13, and a grid oscillation suppression device 100. The various elements of the memory 11, the processor 12 and the communication unit 13 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the memory 11, the processor 12 and the communication unit 13 may be electrically connected to each other through one or more communication buses or signal lines.
In this embodiment, the Memory 11 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 11 is used for storing a computer program, and the processor 12 can execute the computer program after receiving an execution instruction.
In this embodiment, the processor 12 may be an integrated circuit chip having signal processing capabilities. The Processor 12 may be a general-purpose Processor including at least one of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Network Processor (NP), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, and discrete hardware components. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that implements or executes the methods, steps and logic blocks disclosed in the embodiments of the present application.
In this embodiment, the communication unit 13 is configured to establish a communication connection between the energy storage power station control device 10 and other electronic devices through a network, and to transmit and receive data through the network, where the network includes a wired communication network and a wireless communication network. For example, the energy storage power station control device 10 may be communicatively connected to a certain power grid system through the communication unit 13 to obtain information about whether the power grid system generates low-frequency oscillation from the power grid system, and meanwhile, the energy storage power station control device 10 may also be communicatively connected to an energy storage power station connected to the power grid system through the communication unit 13 to send a corresponding control instruction to the energy storage power station.
In the present embodiment, the grid oscillation suppression device 100 includes at least one software function module that can be stored in the memory 11 in the form of software or firmware or in the operating system of the energy storage plant control equipment 10. The processor 12 may be used to execute executable modules stored by the memory 11, such as software functional modules and computer programs included in the grid oscillation suppression device 100. The energy storage power station control device 10 can adjust the active power of the power grid system by using the charging and discharging characteristics of the energy storage power station through the power grid oscillation suppression device 100, so that the low-frequency oscillation of the power grid is effectively suppressed, and the power grid system gradually returns to a normal operation state.
It is understood that the block diagram shown in fig. 1 is only one constituent schematic diagram of the energy storage plant control apparatus 10, and that the energy storage plant control apparatus 10 may also include more or fewer components than those shown in fig. 1, or have a different configuration than that shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
In the present application, in order to ensure that the energy storage power station control device 10 can effectively suppress the low-frequency oscillation of the power grid, so that the power grid system gradually recovers to a normal operation state, the foregoing functions are implemented by providing a power grid oscillation suppression method in the embodiments of the present application, and the power grid oscillation suppression method provided in the present application is explained in detail below.
Referring to fig. 2, fig. 2 is a schematic flow chart of a grid oscillation suppression method according to an embodiment of the present disclosure. In the embodiment of the present application, the grid oscillation suppression method may include steps S210 to S240.
Step S210, determining a current power grid frequency deviation value of the target power grid under the condition that the target power grid generates low-frequency oscillation.
In this embodiment, when the active power of the target power grid has a low-frequency oscillation phenomenon, the target power grid may notify the energy storage power station control device 10 through the network, and the energy storage power station control device 10 correspondingly obtains a current actual power grid frequency value of the target power grid, and then determines a power grid frequency deviation value of the target power grid compared with a stable operation state based on a reference power grid frequency value of the target power grid in the stable operation state. At this time, the step of determining the current grid frequency deviation value of the target grid may include:
acquiring a reference power grid frequency value of a target power grid and a current actual power grid frequency value of the target power grid;
and calculating a difference value between the actual power grid frequency value and the reference power grid frequency value to obtain the power grid frequency deviation value.
And step S220, detecting whether the target energy storage power station meets the oscillation suppression dispatching condition currently or not according to the power grid frequency deviation value.
In this embodiment, after the energy storage power station control device 10 determines the current power grid frequency deviation value of the target power grid, it is detected whether the target energy storage power station connected to the target power grid needs to perform oscillation suppression operation on the target power grid at present according to the power grid frequency deviation value. If the corresponding target energy storage power station currently meets the oscillation suppression scheduling condition, the oscillation suppression scheduling condition indicates that the target energy storage power station needs oscillation suppression operation; and if the corresponding target energy storage power station does not meet the oscillation suppression scheduling condition currently, the target energy storage power station is indicated to be free from oscillation suppression operation, and the current running state of the target power grid is restored to be close to a stable state. In this process, the step of detecting whether the target energy storage power station currently meets the oscillation suppression scheduling condition according to the power grid frequency deviation value includes:
the power grid frequency deviation value is compared with a preset frequency deviation range;
and if the power grid frequency deviation value is within the preset frequency deviation range, judging that the target energy storage power station does not meet the oscillation suppression scheduling condition currently, and otherwise, judging that the target energy storage power station meets the oscillation suppression scheduling condition.
The preset frequency deviation range is used for representing a frequency deviation numerical range of the corresponding power grid in a better state. In one embodiment of this embodiment, the upper limit value and the lower limit value of the frequency deviation corresponding to the preset frequency deviation range have the same absolute value.
And step S230, under the condition that the target energy storage power station is detected to meet the oscillation suppression scheduling condition, calculating a current power adjustment value of the target energy storage power station aiming at the target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station.
In this embodiment, when the energy storage power station control device 10 determines that the target energy storage power station satisfies the oscillation suppression scheduling condition, the energy storage power station control device 10 calculates a current power adjustment value of the target energy storage power station for the target power grid by using the maximum charging and discharging power value of the target energy storage power station as a power adjustment constraint on the basis of the power grid frequency deviation value, so that the target energy storage power station provides positive damping to the target power grid when operating based on the power adjustment value to suppress low-frequency oscillation of the target power grid. The whole calculation process of the power adjustment value can be regarded as a combination of a proportional-integral droop control link, an inertia control link and an amplitude limiting control link, and at this time, the step of calculating the current power adjustment value of the target energy storage power station for the target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station may include:
calculating the current operation adjusting power value of the target energy storage power station aiming at the target power grid according to the droop control coefficient, the integral control coefficient, the inertia control time constant and the power grid frequency deviation value of the target energy storage power station;
and carrying out power amplitude limiting processing on the operation adjusting power value according to the maximum charge and discharge power value to obtain the power adjusting value, wherein the absolute value of the power adjusting value is smaller than or equal to the absolute value of the maximum charge and discharge power value.
Wherein, the calculation process of the operation adjustment power value is expressed by the following formula:
wherein Δ ω is used to represent the grid frequency deviation value, PBFor representing said operating regulation power value, KiFor indicating the droop control coefficient, KpFor representing said integral control coefficient, TwFor representing the inertial control time constant,
for representing the time-domain integral, T, of the droop control coefficientws is used to represent the time-domain differential to the inertial control time constant.
The maximum charging and discharging power values include a maximum charging power value and a maximum discharging power value, and respective power absolute values (i.e., power amplitudes) of the maximum charging power value and the maximum discharging power value are equal to each other. In the process of performing power amplitude limiting processing on the operation adjusting power value, if the absolute value of the operation adjusting power value is greater than the absolute value of the maximum charge-discharge power value, the correspondingly obtained absolute value of the power adjusting value is equal to the absolute value of the maximum charge-discharge power value, and the positive and negative attributes of the power adjusting value and the operation adjusting power value are kept consistent; and if the absolute value of the operation adjustment power value is smaller than or equal to the absolute value of the maximum charge-discharge power value, the correspondingly obtained power adjustment value is the operation adjustment power value.
And S240, controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
In this embodiment, when the energy storage power station control device 10 determines that the target energy storage power station satisfies the oscillation suppression scheduling condition, the required power adjustment value controls the target energy storage power station to inject power into the active power of the target power grid according to the power adjustment value (i.e., controls the target energy storage power station to discharge), or controls the target energy storage power station to absorb power from the active power of the target power grid (i.e., controls the target energy storage power station to charge), so as to provide positive damping for the target power grid to suppress low-frequency oscillation of the target power grid, and gradually recover the target power grid to a normal operation state.
In this process, the target power grid can be regarded as a single-machine-infinite system, and the linearized mathematical model corresponding to the target power grid can be expressed by using the following equation set:
wherein, TjAnd
respectively, the inertia time constant and the d-axis open-circuit transient time constant, M, of the target power grideAnd MmGenerator electromagnetic torque and prime mover mechanical torque, ω' and ω, respectively, of the target grid0' rotor speed and synchronous speed of the generator in the target grid respectively, D is damping coefficient of the target grid, and delta is rotor (position) angle, E ' of the generator in the target grid 'qAnd EfdQ-axis transient electromotive force and d-axis excitation electromotive force, x, respectivelydAnd x'dSynchronous reactance of d-axis and transient reactance of generator, idIs the d-axis component of the generator-side current.
Then, the target energy storage power station is considered in a linearized mathematical model of the target power grid, that is, the power adjustment value is substituted into the linearized mathematical model of the target power grid for model remodeling, and the linearized mathematical model integrating the target energy storage power station and the target power grid is obtained by:
wherein, K1～K6And
and model coefficients of a power supply system consisting of the target energy storage power station and the target power grid at different operating points are used. Therefore, the damping representation condition of the whole power supply system can be adjusted by adjusting the power adjustment value of the target energy storage power station, so that the low-frequency oscillation of the power grid is effectively inhibited, and the power grid system gradually recovers to a normal operation state.
Optionally, referring to fig. 3, fig. 3 is a flowchart illustrating sub-steps included in step S240 in fig. 2. In this embodiment, the step S240 may include substeps S241 to S243.
In the substep S241, it is checked whether the power adjustment value is positive.
And a substep S242, controlling the target energy storage power station to perform power injection operation on the active power of the target power grid according to the power adjustment value under the condition that the power adjustment value is detected to be a positive number.
And a substep S243, controlling the target energy storage power station to perform power absorption operation on the active power of the target power grid according to the absolute value of the power adjustment value under the condition that the power adjustment value is detected to be a negative number.
Therefore, the active power of the power grid system can be adjusted by executing the steps S210 to S240 and utilizing the charging and discharging characteristics of the energy storage power station, so that positive damping is provided for the power grid system to suppress low-frequency oscillation of the target power grid, the low-frequency oscillation of the power grid is effectively suppressed, and the power grid system gradually returns to a normal operation state. Meanwhile, the active power of the power grid system can be adjusted by fully utilizing the charging and discharging characteristics of the energy storage power station by executing the substep S241 to the substep S243.
Optionally, referring to fig. 4, fig. 4 is a second schematic flowchart of the grid oscillation suppression method according to the embodiment of the present application. In the embodiment of the present application, compared with the grid oscillation suppression method shown in fig. 2, the grid oscillation suppression method shown in fig. 4 may further include step S250.
And step S250, controlling the target energy storage power station not to adjust the active power of the target power grid under the condition that the target energy storage power station is detected not to meet the oscillation suppression scheduling condition.
In this embodiment, if it is detected that the target energy storage power station does not satisfy the oscillation suppression scheduling condition, it may be indicated that the current operation state of the target power grid tends to a stable state, and at this time, oscillation suppression operation is not required, and at this time, the target energy storage power station may be directly controlled not to perform power injection operation or power absorption operation on the target power grid, so as to reduce the oscillation suppression energy consumption of the target energy storage power station.
Therefore, the present application can reduce the oscillation suppression energy consumption of the target energy storage power station by executing the step S250.
In order to ensure that the energy storage plant control device 10 can perform the grid oscillation suppression method through the grid oscillation suppression device 100, the energy storage plant control device 100 performs the functions by dividing the grid oscillation suppression device 100 into functional modules. The specific components of the grid oscillation suppression device 100 provided in the present application are described correspondingly below.
Referring to fig. 5, fig. 5 is a schematic composition diagram of a grid oscillation suppression device 100 according to an embodiment of the present disclosure. In the embodiment of the present application, the grid oscillation suppression apparatus 100 may include a frequency deviation determination module 110, an energy storage scheduling detection module 120, a power adjustment calculation module 130, and an energy storage power station control module 140.
The frequency deviation determining module 110 is configured to determine a current grid frequency deviation value of a target grid when the target grid generates low-frequency oscillation.
And the energy storage scheduling detection module 120 is configured to detect whether a target energy storage power station currently meets an oscillation suppression scheduling condition according to the power grid frequency deviation value, where the target energy storage power station is connected to the target power grid.
And a power adjustment calculation module 130, configured to calculate a current power adjustment value of the target energy storage power station for the target power grid according to the power grid frequency deviation value and the maximum charge-discharge power value of the target energy storage power station when it is detected that the target energy storage power station satisfies the oscillation suppression scheduling condition.
And the energy storage power station control module 140 is configured to control the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
The energy storage power station control module 140 is further configured to control the target energy storage power station not to adjust the active power of the target power grid when it is detected that the target energy storage power station does not satisfy the oscillation suppression scheduling condition.
It should be noted that the fundamental principle and the generated technical effect of the grid oscillation suppression device 100 provided in the embodiment of the present application are the same as those of the grid oscillation suppression method described above. For a brief description, where not mentioned in this embodiment section, reference may be made to the above description of the grid oscillation suppression method.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part. The functions may be stored in a storage medium if they are implemented in the form of software function modules and sold or used as separate products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In summary, in the power grid oscillation suppression method and apparatus, the energy storage power station control device, and the storage medium provided in the present application, when a power grid frequency deviation value is determined when a target power grid generates a low-frequency oscillation condition, and it is detected that the target energy storage power station satisfies an oscillation suppression scheduling condition, a current power adjustment value of the target energy storage power station for the target power grid is calculated based on the power grid frequency deviation value with a maximum charge-discharge power value of the target energy storage power station as a constraint, and then the target energy storage power station is controlled to adjust the active power of the target power grid according to the power adjustment value, so that the active power of the power grid is adjusted by using the charge-discharge characteristics of the energy storage power station, so that the low-frequency oscillation of the power grid is effectively suppressed, and the power grid system gradually returns to a normal operation state.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A method for grid oscillation suppression, the method comprising:
determining a current power grid frequency deviation value of a target power grid under the condition that the target power grid generates low-frequency oscillation;
detecting whether a target energy storage power station meets an oscillation suppression scheduling condition currently or not according to the power grid frequency deviation value, wherein the target energy storage power station is connected with the target power grid;
under the condition that the target energy storage power station is detected to meet oscillation suppression scheduling conditions, calculating a current power adjustment value of the target energy storage power station for a target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station;
and controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
2. The method of claim 1, wherein the step of determining the current grid frequency deviation value of the target grid comprises:
acquiring a reference power grid frequency value of the target power grid and a current actual power grid frequency value of the target power grid;
and calculating a difference value between the actual power grid frequency value and the reference power grid frequency value to obtain the power grid frequency deviation value.
3. The method of claim 1, wherein the step of detecting whether a target energy storage power station currently meets oscillation suppression scheduling conditions according to the grid frequency deviation value comprises:
the power grid frequency deviation value is compared with a preset frequency deviation range;
and if the power grid frequency deviation value is within the preset frequency deviation range, judging that the target energy storage power station does not meet the oscillation suppression scheduling condition currently, and otherwise, judging that the target energy storage power station meets the oscillation suppression scheduling condition.
4. The method according to claim 1, wherein the step of calculating the current power adjustment value of the target energy storage power station for the target power grid according to the grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station comprises:
calculating the current operation adjusting power value of the target energy storage power station aiming at the target power grid according to the droop control coefficient, the integral control coefficient, the inertia control time constant and the power grid frequency deviation value of the target energy storage power station;
and carrying out power amplitude limiting processing on the operation adjusting power value according to the maximum charge and discharge power value to obtain the power adjusting value, wherein the absolute value of the power adjusting value is smaller than or equal to the absolute value of the maximum charge and discharge power value.
5. The method of claim 4, wherein the calculation of the running trim power value is expressed by the following equation:
wherein Δ ω is used to represent the grid frequency deviation value, PBFor representing said operating regulation power value, KiFor indicating the droop control coefficient, KpFor representing said integral control coefficient, TwFor representing the inertial control time constant,
for representing the time-domain integral, T, of the droop control coefficientws is used to represent the time-domain differential to the inertial control time constant.
6. The method of claim 1, wherein the step of controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value comprises:
detecting whether the power adjustment value is a positive number;
under the condition that the power adjustment value is detected to be a positive number, controlling the target energy storage power station to perform power injection operation on the active power of the target power grid according to the power adjustment value;
and under the condition that the power adjustment value is detected to be a negative number, controlling the target energy storage power station to perform power absorption operation on the active power of the target power grid according to the absolute value of the power adjustment value.
7. The method according to any one of claims 1-6, further comprising:
and controlling the target energy storage power station not to adjust the active power of the target power grid under the condition that the target energy storage power station is detected not to meet the oscillation suppression scheduling condition.
8. A grid oscillation suppression apparatus, the apparatus comprising:
the frequency deviation determining module is used for determining a current power grid frequency deviation value of a target power grid under the condition that the target power grid generates low-frequency oscillation;
the energy storage scheduling detection module is used for detecting whether a target energy storage power station meets an oscillation suppression scheduling condition or not according to the power grid frequency deviation value, wherein the target energy storage power station is connected with the target power grid;
the power adjustment calculation module is used for calculating a current power adjustment value of the target energy storage power station aiming at a target power grid according to the power grid frequency deviation value and the maximum charging and discharging power value of the target energy storage power station under the condition that the target energy storage power station is detected to meet the oscillation suppression scheduling condition;
and the energy storage power station control module is used for controlling the target energy storage power station to adjust the active power of the target power grid according to the power adjustment value.
9. The apparatus of claim 8,
the energy storage power station control module is further configured to control the target energy storage power station not to adjust the active power of the target power grid under the condition that the target energy storage power station is detected not to meet the oscillation suppression scheduling condition.
10. An energy storage plant control apparatus, characterized by comprising a processor and a memory, the memory storing a computer program executable by the processor, the processor being capable of executing the computer program to implement the grid oscillation suppression method of any one of claims 1 to 7.
11. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the grid oscillation suppression method according to any of claims 1-7.
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