A multi-energy-storage-station cooperative control method and system for wide frequency oscillation suppression

Abstract

The application discloses a kind of wide frequency oscillation suppression-oriented multi-energy storage station collaborative control method and system, the topology structure and electrical element basic parameters of the power system of the region to be controlled are acquired, impedance model is constructed according to topology structure and electrical element basic parameters, after obtaining the oscillation mode of power system, the observability of each energy storage station to oscillation mode is calculated, the energy storage station with greater observability than preset observability value is selected as the energy storage station to be distributed, and the energy storage capacity and comprehensive control gain for oscillation suppression of the energy storage station to be distributed are calculated and optimized to obtain the optimal energy storage capacity and optimal comprehensive control gain of each energy storage station for oscillation suppression. Through the method, the observability index of oscillation mode is introduced, the energy storage capacity for oscillation suppression in power system is optimized and dispatched, the scheduling efficiency and accuracy of energy storage capacity in light storage charging station are improved, and the stability of power system is maintained.

Description

Technical Field

[0001] This invention relates to the field of power control technology, and in particular to a collaborative control method and system for multiple energy storage stations aimed at broadband oscillation suppression. Background Technology

[0002] With the increasingly prominent "high-voltage and high-efficiency" characteristics of power systems, new power systems are undergoing significant changes in their physical characteristics and stability mechanisms, facing challenges from various new stability problems. Wide-band oscillations (WBOs) are a typical example. WBOs arise from the multi-timescale interactions of "mechanical-electrical-magnetic-control" processes formed by the interconnection of massive heterogeneous power electronic devices through complex power networks, with frequencies ranging from several Hz to several kHz. Suppression of WBOs is mainly achieved through active damping control on the source side or grid side; the former includes optimizing control parameter design and improving converter control strategies, while the latter often requires the configuration of specific electrical equipment, such as FACTS (Flexible Alternative Current Transmission System) controllers, static synchronous compensators, and energy storage stations. Improving the control structure of energy storage converters can increase system damping, suppress the interaction between the power electronic interface and the grid, and thus suppress oscillations; at the same time, energy storage can also provide services such as load regulation, peak shaving and frequency regulation, and emergency power supply, playing a key fundamental role in new power systems.

[0003] In existing technologies, most of them mainly use energy storage to suppress oscillations caused by a single target (such as grid-connected wind power), which is limited to a single device and a single unit equivalent system. When facing oscillations caused by multiple devices and multiple sites, they cannot accurately and efficiently dispatch the vast energy storage resources in the region. Summary of the Invention

[0004] This invention provides a collaborative control method and system for multiple energy storage stations oriented towards broadband oscillation suppression. By introducing a controllability index for oscillation modes, the energy storage capacity used for oscillation suppression in the power system is optimized and scheduled, thereby improving the scheduling efficiency and accuracy of energy storage capacity in photovoltaic-energy storage charging stations and maintaining power system stability.

[0005] A first aspect of this invention provides a collaborative control method for multiple energy storage stations aimed at suppressing broadband oscillations, the method comprising: Obtain the topology and basic parameters of electrical components of the power system in the area to be controlled; An impedance model is constructed using the topology and basic parameters of electrical components, and the oscillation mode of the power system is obtained using the impedance model. An observability analysis of the oscillation modes of the power system is performed to obtain the observability of each energy storage station in the power system for the oscillation modes. Energy storage stations with observability greater than the preset observability value are selected as energy storage stations to be allocated. The energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression. The comprehensive control gain of the energy storage stations to be allocated is obtained based on the energy storage capacity of the energy storage stations to be allocated for oscillation suppression. The energy storage capacity optimization model of the energy storage station is called to optimize the energy storage capacity of the energy storage station to be allocated for oscillation suppression, so as to obtain the optimal energy storage capacity and optimal comprehensive control gain of each energy storage station for oscillation suppression, so that the power system can allocate energy storage resources to each energy storage station according to the optimal energy storage capacity and optimal comprehensive control gain for oscillation suppression.

[0006] In this embodiment, the topology and basic parameters of electrical components of the power system in the area to be controlled are obtained. An impedance model is constructed based on the topology and basic parameters of electrical components. After obtaining the oscillation mode of the power system, an observability analysis is performed on the oscillation mode to obtain the observability of each energy storage station for the oscillation mode. Then, energy storage stations with observability greater than a preset observability value are selected as energy storage stations to be allocated. Then, based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, the energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained. Based on the energy storage capacity for oscillation suppression of the energy storage stations to be allocated, the comprehensive control gain of the energy storage stations to be allocated is obtained. Finally, the energy storage capacity optimization model of the energy storage stations is called to optimize and solve the energy storage capacity for oscillation suppression of the energy storage stations to be allocated, to obtain the optimal energy storage capacity for oscillation suppression and the optimal comprehensive control gain of each energy storage station. This allows the power system to allocate energy storage resources to each energy storage station based on the optimal energy storage capacity for oscillation suppression and the optimal comprehensive control gain. This method comprehensively optimizes the allocation of energy storage capacity participating in oscillation suppression based on indicators such as total available capacity and observability, enabling the energy storage system to suppress broadband oscillations with a minimum capacity scale, thereby improving the scheduling efficiency and accuracy of energy storage capacity within the photovoltaic-storage charging station.

[0007] In one possible implementation of the first aspect, the oscillation mode of the power system is as follows: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

[0008] In one possible implementation of the first aspect, an observability analysis is performed on the oscillation modes of the power system to obtain the observability of each energy storage station in the power system for the oscillation modes, specifically: The relative amplitude of the oscillation component in the voltage of each energy storage station is calculated to obtain the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K.

[0009] In one possible implementation of the first aspect, the energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, specifically as follows: The capacity allocation calculation formula is used to calculate the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, thus obtaining the energy storage capacity for oscillation suppression of each energy storage station to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0010] In one possible implementation of the first aspect, the comprehensive control gain of the energy storage station to be allocated is obtained based on the energy storage capacity of the station to be allocated for oscillation suppression, specifically as follows: The comprehensive control gain of the energy storage station to be allocated is calculated based on the voltage level of the energy storage station, the feedback quantity in the broadband oscillation suppression process, and the energy storage capacity of the energy storage station to be allocated for oscillation suppression. The comprehensive control gain of the energy storage station to be allocated is: in, This indicates the voltage level at which the energy storage station is connected to the power grid. For the equivalent control loop gain, y This represents the feedback quantity during the broadband oscillation suppression process. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0011] In one possible implementation of the first aspect, the energy storage capacity optimization model for the energy storage station includes an objective function, energy storage power constraints, and system stability constraints, wherein the power system objective function is: in, This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. This represents the total energy storage capacity to be allocated for oscillation suppression; The energy storage power constraints are as follows: in, This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The system stability constraints are: in, This represents the damping of the power system in oscillation mode m. This represents the critical damping of the power system in oscillation mode m.

[0012] A second aspect of the present invention provides a multi-energy storage station collaborative control system for broadband oscillation suppression, the system comprising: The acquisition module is used to acquire the topology and basic parameters of electrical components of the power system in the area to be controlled. The module is used to construct an impedance model using the topology and basic parameters of electrical components, and then use the impedance model to obtain the oscillation mode of the power system. The observability calculation module is used to perform observability analysis on the oscillation mode of the power system, obtain the observability of each energy storage station in the power system to the oscillation mode, and select the energy storage station with an observability greater than the preset observability value as the energy storage station to be allocated. The energy storage capacity calculation module is used to obtain the energy storage capacity for oscillation suppression of each energy storage station to be allocated based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, and to obtain the comprehensive control gain of the energy storage stations to be allocated based on the energy storage capacity for oscillation suppression of the energy storage stations to be allocated. The solution module is used to call the energy storage capacity optimization model of the energy storage station to optimize the energy storage capacity of the energy storage station to be allocated for oscillation suppression, and obtain the optimal energy storage capacity and optimal comprehensive control gain for each energy storage station, so that the power system can allocate energy storage resources to each energy storage station according to the optimal energy storage capacity and optimal comprehensive control gain for oscillation suppression.

[0013] In one possible implementation of the second aspect, the oscillation mode of the power system is as follows: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

[0014] In one possible implementation of the second aspect, the observability calculation module includes observability units. The observability unit is used to calculate the relative amplitude of the oscillation component in the voltage of each energy storage station, thereby obtaining the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K.

[0015] In one possible implementation of the second aspect, the energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, specifically as follows: The capacity allocation calculation formula is used to calculate the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, thus obtaining the energy storage capacity for oscillation suppression for each energy storage station to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating an embodiment of the multi-energy storage station collaborative control method for broadband oscillation suppression provided by the present invention. Figure 2 A schematic diagram of the power structure of an embodiment of the multi-energy storage station cooperative control method for broadband oscillation suppression provided by the present invention; Figure 3 This is a schematic diagram of the optimization solution process for an embodiment of the multi-energy storage station cooperative control method for broadband oscillation suppression provided by the present invention. Figure 4 This is a schematic diagram of the system structure of another embodiment of the multi-energy storage station cooperative control method for broadband oscillation suppression provided by the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 Please refer to Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of the multi-energy storage station cooperative control method for broadband oscillation suppression provided by the present invention, including steps S11 to S15. The specific steps are as follows: S11. Obtain the topology and basic parameters of electrical components of the power system in the area to be controlled.

[0019] In this embodiment, as Figure 2 As shown, Figure 2 This is a schematic diagram of a power system structure, showing a regional power grid containing... N One energy storage station, N Each energy storage station has a capacity of [number]. S 1- S N The functions of energy storage stations include load regulation, peak shaving and frequency regulation, and emergency power supply. They can also suppress oscillation modes in the system through additional damping control. However, due to total capacity constraints and utilization efficiency considerations, the energy storage capacity called up by damping control usually only accounts for a portion of the energy storage station's capacity. The specific proportion and value need to be obtained through optimization. The flowchart for the optimization solution of the collaborative control method is shown below. Figure 3 As shown.

[0020] First, obtain the topology of the power system in the area and the parameters of electrical components such as generators, transmission lines, and energy storage stations.

[0021] S12. Construct an impedance model using the topology and basic parameters of electrical components, and use the impedance model to obtain the oscillation mode of the power system.

[0022] In this embodiment, based on the topology and basic parameters of each electrical component within the region, a corresponding impedance model is established to obtain the oscillation modes present in the system. The oscillation modes can be represented as follows: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

[0023] S13. Perform observability analysis on the oscillation mode of the power system to obtain the observability of each energy storage station in the power system for the oscillation mode, and select the energy storage stations with observability greater than the preset observability value as the energy storage stations to be allocated.

[0024] In a preferred embodiment, an observability analysis is performed on the oscillation modes of the power system to obtain the observability of each energy storage station in the power system for the oscillation modes, specifically: The relative amplitude of the oscillation component in the voltage of each energy storage station is calculated to obtain the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K.

[0025] In this embodiment, the controllability and observability of the oscillation mode m for N energy storage station nodes are calculated based on the analysis method of observability and controllability of the oscillation mode.

[0026] An oscillation mode is observable if its dynamic process can be observed by the system's output. For an impedance network, if the voltage and branch current of an energy storage station node contain components of a certain mode, then that mode is observable. Therefore, observability is quantitatively described using the relative amplitude of the oscillation component in the energy storage station node voltage. The observability calculation formula is: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K; Similarly, controllability can also be defined. The physical meaning of controllability is the amplitude of oscillations induced after a disturbance is applied to a node / branch of an energy storage station, reflecting the ability to control the oscillations. The expression for controllability is: in, This indicates the controllability of energy storage station K. This represents the voltage component amplitude of oscillation mode m at energy storage station k. This represents the voltage component amplitude of the oscillation mode m after a disturbance is applied to the energy storage station.

[0027] If all energy storage station nodes and all oscillation modes of the system are taken into consideration, it can form N The observability / controllability matrix of each node: Since both the nodal admittance matrix and the loop impedance matrix are symmetric matrices, the observability matrix can be mathematically proven. With controllability matrix Equivalence, that is According to its conclusion, the observability matrix With controllability matrix Equivalent, therefore controllability indicators can also be described by observability indicators.

[0028] Then, based on the system control requirements, set the observability threshold. If a node where an energy storage station is located is not observable for oscillation mode m, then its output voltage and current will not contain the oscillation component of mode m, and will not reflect the dynamic characteristics of that mode, making it more difficult to suppress the corresponding oscillation mode. Therefore, energy storage stations participating in oscillation suppression must have appropriate observability, that is, satisfy: in, This indicates the scalability of energy storage station K. The threshold representing observability.

[0029] Energy storage stations that meet the observability criteria will be selected as the energy storage stations to be allocated, and these stations will participate in the allocation of capacity used to suppress broadband oscillations.

[0030] S14. Based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, obtain the energy storage capacity for each energy storage station to be allocated for oscillation suppression, and obtain the comprehensive control gain of the energy storage stations to be allocated based on the energy storage capacity for oscillation suppression of the energy storage stations to be allocated.

[0031] In a preferred embodiment, the energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, specifically as follows: The capacity allocation calculation formula is used to calculate the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, thus obtaining the energy storage capacity for oscillation suppression for each energy storage station to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0032] In a preferred embodiment, the overall control gain of the energy storage station to be allocated is obtained based on the energy storage capacity used for oscillation suppression, specifically as follows: The comprehensive control gain of the energy storage station to be allocated is calculated based on the voltage level of the energy storage station, the feedback quantity in the broadband oscillation suppression process, and the energy storage capacity of the energy storage station to be allocated for oscillation suppression. The comprehensive control gain of the energy storage station to be allocated is: in, This indicates the voltage level at which the energy storage station is connected to the power grid. For the equivalent control loop gain, y This represents the feedback quantity during the broadband oscillation suppression process. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0033] In this embodiment, energy storage station k is allocated capacity for suppressing broadband oscillations during this control process. Its rated capacity and observability of oscillation modes Proportional to each other, therefore the energy storage capacity of energy storage station k used for oscillation suppression is calculated, and the capacity allocation calculation formula is: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0034] Then, based on the allocated capacity of the energy storage station, the comprehensive control gain is set. According to the basic definition of active power in a three-phase AC circuit, the energy storage station... k The capacity that needs to be called in collaborative control It can also be expressed as: After sorting: in, Indicates energy storage station k Voltage level to be connected to the power grid g For the equivalent control loop gain, y This represents the feedback quantity (usually the oscillation amplitude) during the broadband oscillation suppression process.

[0035] g and yThe product of the voltage and the grid voltage serves as a reference signal for the output current of the energy storage station, and thus can be multiplied with the grid voltage to characterize the power.

[0036] S15. Call the energy storage capacity optimization model of the energy storage station to optimize the energy storage capacity of the energy storage station to be allocated for oscillation suppression, and obtain the optimal energy storage capacity and optimal comprehensive control gain of each energy storage station for oscillation suppression, so that the power system can allocate energy storage resources to each energy storage station according to the optimal energy storage capacity and optimal comprehensive control gain for oscillation suppression.

[0037] In a preferred embodiment, the energy storage capacity optimization model for the energy storage station includes an objective function, energy storage power constraints, and system stability constraints. The power system objective function is: in, This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. This represents the total energy storage capacity to be allocated for oscillation suppression; The energy storage power constraints are as follows: in, This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The system stability constraints are: in, This represents the damping of the power system in oscillation mode. This represents the critical damping of the power system in oscillation mode.

[0038] In this embodiment, after obtaining the energy storage capacity allocated to the energy storage station for oscillation suppression and the overall control gain, it is necessary to optimize the energy storage capacity allocated to the energy storage station for oscillation suppression to obtain the optimal energy storage capacity and overall control gain for oscillation suppression. The control gain also needs to be determined among the various physical quantities. g The value of . g The value of has a dual impact on the oscillation control effect: on the one hand, a larger ... g This value can improve control performance and ensure system safety and stability, but it also requires a larger scale of energy storage, increasing operating costs and resource consumption. The goal is to find the optimal value under the target oscillation mode. g An optimization model needs to be established and implemented to solve the problem. The objective function of the optimization problem is to minimize the energy storage capacity of the entire system. The objective function of the power system is: in, This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. This represents the total energy storage capacity to be allocated for oscillation suppression; The energy storage power constraints are as follows: in, This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The system stability constraints are: in, This represents the damping of the power system in oscillation mode m. This represents the critical damping of the power system in oscillation mode m.

[0039] There are two ways to obtain it: 1) Establish a small disturbance model of the power grid within the region and solve for its oscillation mode. m The characteristic roots below, i.e., the oscillation mode formula The real part of the characteristic root corresponds to damping. ; 2) Establish an overall model of the power system in the region, and observe and measure the voltage / current attenuation through electromagnetic transient simulation.

[0040] The optimal energy storage capacity for oscillation suppression, the optimal integrated control gain, and the optimal total energy storage capacity to be allocated for oscillation suppression for each energy storage station, obtained through optimization, are displayed to relevant personnel to facilitate collaborative control.

[0041] This invention obtains the topology and basic parameters of electrical components of the power system in the area to be controlled. Based on the topology and basic parameters, an impedance model is constructed to obtain the oscillation modes of the power system. Observability analysis is then performed on these oscillation modes to obtain the observability of each energy storage station for each oscillation mode. Energy storage stations with observability greater than a preset observability value are selected as energy storage stations to be allocated. The energy storage capacity for oscillation suppression of each energy storage station is obtained based on its preset energy storage capacity and the total energy storage capacity to be allocated for oscillation suppression. The comprehensive control gain of each energy storage station is then obtained based on its energy storage capacity for oscillation suppression. Finally, an energy storage capacity optimization model is called to optimize the energy storage capacity for oscillation suppression of each energy storage station, obtaining the optimal energy storage capacity and optimal comprehensive control gain for each station. This allows the power system to allocate energy storage resources to each energy storage station based on the optimal energy storage capacity and optimal comprehensive control gain for oscillation suppression. This method comprehensively optimizes the allocation of energy storage capacity participating in oscillation suppression based on total available capacity and observability indicators, enabling the energy storage system to suppress broadband oscillations with a minimum capacity scale, thereby improving the scheduling efficiency and accuracy of energy storage capacity within the photovoltaic-storage charging station.

[0042] Example 2 Accordingly, see Figure 4 , Figure 4 The present invention provides a multi-energy storage station collaborative control system for broadband oscillation suppression, as shown in the figure. This multi-energy storage station collaborative control system for broadband oscillation suppression includes: The acquisition module 401 is used to acquire the topology and basic parameters of electrical components of the power system in the area to be controlled; Module 402 is used to construct an impedance model using the topology and basic parameters of electrical components, and to obtain the oscillation mode of the power system using the impedance model. The observability calculation module 403 is used to perform observability analysis on the oscillation mode of the power system, obtain the observability of each energy storage station in the power system to the oscillation mode, and select the energy storage station with an observability greater than the preset observability value among all energy storage stations as the energy storage station to be allocated. The energy storage capacity calculation module 404 is used to obtain the energy storage capacity for oscillation suppression of each energy storage station to be allocated based on the preset energy storage capacity of the energy storage station to be allocated and the total energy storage capacity to be allocated for oscillation suppression, and to obtain the comprehensive control gain of the energy storage station to be allocated based on the energy storage capacity for oscillation suppression of the energy storage station to be allocated. The solver module 405 is used to call the energy storage capacity optimization model of the energy storage station to optimize the energy storage capacity of the energy storage station to be allocated for oscillation suppression, and obtain the optimal energy storage capacity and optimal comprehensive control gain of each energy storage station for oscillation suppression, so that the power system can allocate energy storage resources to each energy storage station according to the optimal energy storage capacity and optimal comprehensive control gain for oscillation suppression.

[0043] In a preferred embodiment, the oscillation mode of the power system is: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

[0044] In a preferred embodiment, the observability calculation module 403 includes an observability unit 4031. Among them, the observability unit 4031 is used to calculate the relative amplitude of the oscillation component in the voltage of each energy storage station to obtain the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K.

[0045] In a preferred embodiment, the energy storage capacity for oscillation suppression of each energy storage station to be allocated is obtained based on the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, specifically as follows: The capacity allocation calculation formula is used to calculate the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression, thus obtaining the energy storage capacity for oscillation suppression for each energy storage station to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage stations to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

[0046] In summary, implementing the embodiments of the present invention has the following beneficial effects: The process involves acquiring the topology and basic parameters of electrical components of the power system in the area to be controlled. An impedance model is then constructed based on these parameters to obtain the power system's oscillation modes. Observability analysis is performed on these modes to determine the observability of each energy storage station. Energy storage stations with observability greater than a preset observability value are selected as those to be allocated. The energy storage capacity for oscillation suppression at each station is then calculated based on its preset capacity and the total capacity allocated for oscillation suppression. The comprehensive control gain of each station is then calculated based on this capacity. Finally, an energy storage capacity optimization model is used to optimize the energy storage capacity for oscillation suppression at each station, yielding the optimal capacity and optimal comprehensive control gain. This allows the power system to allocate energy storage resources to each station based on the optimal capacity and optimal comprehensive control gain for oscillation suppression. This method comprehensively optimizes the allocation of energy storage capacity participating in oscillation suppression based on total available capacity and observability indicators, enabling the energy storage system to suppress broadband oscillations with a minimum capacity scale, thereby improving the scheduling efficiency and accuracy of energy storage capacity within the photovoltaic-storage charging station.

[0047] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A collaborative control method for multiple energy storage stations aimed at suppressing broadband oscillations, characterized in that, include: Obtain the topology and basic parameters of electrical components of the power system in the area to be controlled; An impedance model is constructed using the aforementioned topology and the basic parameters of the electrical components, and the oscillation mode of the power system is obtained using the impedance model. An observability analysis is performed on the oscillation mode of the power system to obtain the observability of each energy storage station in the power system for the oscillation mode. The energy storage stations with observability greater than a preset observability value are selected as energy storage stations to be allocated. The preset energy storage capacity and the total energy storage capacity to be allocated for oscillation suppression of the energy storage stations to be allocated are calculated using the capacity allocation calculation formula to obtain the energy storage capacity for oscillation suppression of each of the energy storage stations to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage station to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The overall control gain of the energy storage station to be allocated is obtained based on the energy storage capacity used for oscillation suppression of the energy storage station to be allocated; The energy storage capacity optimization model for the energy storage stations is invoked to optimize the energy storage capacity used for oscillation suppression for the energy storage stations to be allocated. This yields the optimal energy storage capacity and optimal integrated control gain for each energy storage station, enabling the power system to allocate energy storage resources to each station based on these optimal values. The energy storage capacity optimization model includes an objective function, energy storage power constraints, and system stability constraints. The objective function is: in, This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. This represents the total energy storage capacity to be allocated for oscillation suppression; The energy storage power constraint condition is as follows: in, This indicates the preset energy storage capacity of the energy storage station to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The system stability constraints are as follows: in, This represents the damping of the power system in oscillation mode m. This represents the critical damping of the power system in oscillation mode m.

2. The multi-energy storage station cooperative control method for broadband oscillation suppression as described in claim 1, characterized in that, The oscillation mode of the power system is: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

3. The multi-energy storage station cooperative control method for broadband oscillation suppression as described in claim 1, characterized in that, The observability analysis of the oscillation modes of the power system is performed to obtain the observability of each energy storage station in the power system for the oscillation modes, specifically as follows: The relative amplitude of the oscillation component in the voltage of each energy storage station is calculated to obtain the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at point k of the energy storage station. This indicates the observability of energy storage station K.

4. The multi-energy storage station cooperative control method for broadband oscillation suppression as described in claim 1, characterized in that, The process of obtaining the comprehensive control gain of the energy storage station to be allocated based on its energy storage capacity for oscillation suppression is specifically as follows: The comprehensive control gain of the energy storage station to be allocated is calculated based on the voltage level of the energy storage station, the feedback quantity during the broadband oscillation suppression process, and the energy storage capacity of the energy storage station to be allocated for oscillation suppression. The comprehensive control gain of the energy storage station to be allocated is: in, This indicates the voltage level at which the energy storage station is connected to the power grid. For the equivalent control loop gain, y This represents the feedback quantity during the broadband oscillation suppression process. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated.

5. A multi-energy storage station collaborative control system for broadband oscillation suppression, characterized in that, include: The acquisition module is used to acquire the topology and basic parameters of electrical components of the power system in the area to be controlled. A construction module is used to construct an impedance model using the topology and basic parameters of the electrical components, and to obtain the oscillation mode of the power system using the impedance model; The observability calculation module is used to perform observability analysis on the oscillation mode of the power system, obtain the observability of each energy storage station in the power system for the oscillation mode, and select the energy storage station with an observability greater than a preset observability value as the energy storage station to be allocated. The energy storage capacity calculation module is used to calculate the preset energy storage capacity of the energy storage stations to be allocated and the total energy storage capacity to be allocated for oscillation suppression using a capacity allocation calculation formula, thereby obtaining the energy storage capacity for oscillation suppression for each of the energy storage stations to be allocated. The capacity allocation calculation formula is as follows: in, This represents the total energy storage capacity to be allocated for oscillation suppression. This indicates the apparent value of each energy storage station. This indicates the preset energy storage capacity of the energy storage station to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The overall control gain of the energy storage station to be allocated is obtained based on the energy storage capacity used for oscillation suppression of the energy storage station to be allocated; The solution module is used to call the energy storage capacity optimization model of the energy storage station to optimize the energy storage capacity for oscillation suppression of the energy storage stations to be allocated, and to obtain the optimal energy storage capacity for oscillation suppression and the optimal comprehensive control gain for each energy storage station. This allows the power system to allocate energy storage resources to each energy storage station based on the optimal energy storage capacity for oscillation suppression and the optimal comprehensive control gain. The energy storage capacity optimization model includes an objective function, energy storage power constraints, and system stability constraints. The objective function is: in, This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated. This represents the total energy storage capacity to be allocated for oscillation suppression; The energy storage power constraint condition is as follows: in, This indicates the preset energy storage capacity of the energy storage station to be allocated. This indicates the energy storage capacity for oscillation suppression at the energy storage stations to be allocated; The system stability constraints are as follows: in, This represents the damping of the power system in oscillation mode m. This represents the critical damping of the power system in oscillation mode m.

6. The multi-energy storage station collaborative control system for broadband oscillation suppression as described in claim 5, characterized in that, The oscillation mode of the power system is: Where M is the total number of oscillation modes, and These represent the damping and angular frequency of the oscillation mode m, respectively.

7. The multi-energy storage station collaborative control system for broadband oscillation suppression as described in claim 6, characterized in that, The observability calculation module includes observability units. The observability unit is used to calculate the relative amplitude of the oscillation component in the voltage of each energy storage station to obtain the observability of each energy storage station. The calculation formula is as follows: in, This represents the voltage component amplitude of oscillation mode m at energy storage station k. This indicates the observability of energy storage station K.

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