A modeling method and system for electrochemical energy storage power stations suitable for dynamic simulation of large power grids

Abstract

The embodiment of the present invention discloses a modeling method and system for an electrochemical energy storage power station suitable for dynamic simulation of a large power grid. By collecting the grid frequency, the active power output of the electrochemical energy storage power station, the power value of the grid tie line, the grid side terminal voltage, the initial state of charge of the battery pack in the electrochemical energy storage power station, and pre-setting the frequency reference value, the terminal voltage reference value, the new energy power smoothing amount, and the active power reference value of the electrochemical energy storage power station, the frequency support model, secondary frequency modulation model, power control model, battery pack model, battery limitation model and grid connection interface model of the electrochemical energy storage power station are respectively established. The simulation model of the electrochemical energy storage power station participating in the multi-scenario regulation of the large power grid constructed by the method and system can accurately simulate the power response characteristics of the energy storage power station, and compared with conventional units, the energy storage power station can quickly respond to the control instructions of the AGC and quickly complete the frequency support requirements of the system.

Description

Technical Field

[0001] The present invention relates to the field of power systems and automation thereof, and in particular to a modeling method and system for an electrochemical energy storage power station suitable for dynamic simulation of a large power grid. Background Art

[0002] Energy storage technologies can be generally categorized by the form of energy storage, including mechanical (pumped hydro, compressed air, flywheels), electrochemical (various batteries), electrical (superconducting energy storage, supercapacitors), thermal, and chemical. Different types of energy storage have varying application scenarios and advantages, depending on their capacity, power, response speed, and characteristics. Currently, electrochemical energy storage offers significant advantages in terms of technological maturity and economic feasibility for large power grids, and has already reached engineering application.

[0003] Electrochemical energy storage, connected to AC systems via converters, offers fast response times and flexible power regulation. It has been extensively studied theoretically in various power grid application scenarios, including peak shaving, power flow control, smoothing renewable energy fluctuations, system voltage and frequency regulation, and power control. However, the lack of a robust dynamic simulation model for electrochemical energy storage power stations suitable for large-scale grid simulations has hindered comprehensive simulation analysis.

[0004] Currently, some scholars have conducted simulation modeling research on different components of energy storage systems. Based on the general control model for renewable energy models proposed by the Western Electricity Coordinating Council (WECC) in the United States—the generator control model REGC_A, the electrical control model REEC_C, and the plant-level control model REPC_A—an electromechanical transient simulation model for energy storage power stations was constructed. However, this model does not include modeling scenarios where energy storage participates in automatic generation control (AGC) secondary frequency regulation. Domestic modeling research on electrochemical energy storage power stations has primarily focused on selected application scenarios and functions. For example, these include simulation models for electrochemical energy storage power stations participating in grid frequency regulation, including different types of battery equivalent models such as the Rint model and the Thevenin model, and electromechanical transient models for time-delayed battery energy storage systems that take into account battery charge and discharge power and charge and discharge cycle limitations. However, these control models are relatively simplistic and lack the relevant functions for electrochemical energy storage power stations to participate in AGC secondary frequency regulation of the large power grid.

[0005] Overall, the currently proposed models are not perfect and cannot support the simulation analysis of energy storage power stations in different application scenarios of large power grids. In particular, there is a lack of models for medium- and long-term dynamic simulation of energy storage power stations participating in the AGC secondary frequency regulation of large power grids. Summary of the Invention

[0006] To address the technical problem in the prior art of lacking a model for medium- and long-term dynamic simulation of energy storage power stations participating in AGC secondary frequency modulation of large power grids, making it difficult to support simulation analysis of energy storage power stations in different application scenarios of large power grids, embodiments of the present invention provide a modeling method and system for electrochemical energy storage power stations suitable for dynamic simulation of large power grids.

[0007] According to one aspect of an embodiment of the present invention, a method for modeling an electrochemical energy storage power station suitable for dynamic simulation of a large power grid is provided, comprising:

[0008] Based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ;

[0009] Based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ;

[0010] Based on the preset active power reference value P of the electrochemical energy storage power station ref , New energy power suppression quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ;

[0011] According to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init Establishing a battery pack model, wherein the output of the battery pack model is an active current limit value;

[0012] According to the active current limit value, the active current component I drefp , reactive current component I qrefpand the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref ;

[0013] Based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

[0014] Optionally, in the above-mentioned embodiments of the present invention, based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include:

[0015] Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is:

[0016]

[0017] Where, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0018] Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is:

[0019]

[0020] Where DBf is the actual controller setting value;

[0021] Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is:

[0022]

[0023]

[0024] Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component;

[0025] Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is:

[0026]

[0027]

[0028] Where K w is the fourth proportional coefficient, T lpwi and T w0wi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component;

[0029] Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is:

[0030] P frc =dP f +dP w .

[0031] Optionally, in the above-mentioned embodiments of the present invention, based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include:

[0032] Based on the grid frequency measurement value f, the preset frequency reference value f ref Calculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is:

[0033] P ACE =Δf*K F *B IASK +ΔP*K L

[0034]

[0035] Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0036] Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is:

[0037]

[0038] Where K P and K I are the first proportional coefficient and the first integral coefficient respectively;

[0039] For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator;

[0040] The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station R Make a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

[0041] Optionally, in the above-mentioned embodiments of the present invention, based on the preset active power reference value P of the electrochemical energy storage power station, ref , New energy power suppression quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ,include:

[0042] Based on the preset active power reference value P of the electrochemical energy storage power station ref and the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is:

[0043]

[0044]

[0045] Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively;

[0046] Based on the active power P of the electrochemical energy storage power station measured from the grid side gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in:

[0047] When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0的 The calculation formula is:

[0048]

[0049] Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively;

[0050] When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0051]

[0052] Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor;

[0053] According to the reactive power Q ref0 The reactive power Q actually output by the electrochemical energy storage power station is determined by the preset reactive power limit value of the electrochemical energy storage power station. ref , whose expression is:

[0054]

[0055] According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

[0056]

[0057] Optionally, in the above-mentioned method embodiments of the present invention, according to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including:

[0058] According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is:

[0059]

[0060] According to the state of charge SOC(t) and the preset operating range of the energy storage battery state of charge [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where:

[0061] When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0

[0062] When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0;

[0063] When SOC min ≤SOC(t)≤SOC max When I dmin =I dmin0 , I dmax =Idmax0 ;

[0064] Where, I dmin0 and I dmax0 are the preset lower and upper limits of the active current, I dmin and I dmax are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

[0065] Optionally, in the above-mentioned method embodiments of the present invention, according to the active current amplitude limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include:

[0066] According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in:

[0067]

[0068] According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is:

[0069]

[0070] Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current;

[0071] According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in:

[0072] When active power control mode takes priority,

[0073] I dref =I dref0

[0074]

[0075] When reactive power control mode takes priority:

[0076]

[0077] I qref =I qref0 .

[0078] Optionally, in the above-mentioned method embodiments of the present invention, based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is:

[0079]

[0080] Where θ is the measured value of the terminal voltage V t The phase angle.

[0081] According to another aspect of an embodiment of the present invention, there is provided an electrochemical energy storage power station modeling system suitable for dynamic simulation of a large power grid, the system comprising:

[0082] Frequency support model module, used to support the frequency of the grid based on the measured value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ;

[0083] Secondary frequency regulation model module, used to adjust the frequency based on the grid frequency measurement value f and the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ;

[0084] Power control model module, used for active power reference value P of electrochemical energy storage power station based on preset ref , New energy power leveling quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ;

[0085] The battery pack model module is used to calculate the active power P genAnd the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init Establishing a battery pack model, wherein the output of the battery pack model is an active current limit value;

[0086] The current limiting model module is used to calculate the active current component I according to the active current limit value. drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref ;

[0087] The grid interface model module is used to calculate the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

[0088] Optionally, in the above-mentioned system embodiments of the present invention, the frequency support model module is based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include:

[0089] Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is:

[0090]

[0091] Where, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0092] Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is:

[0093]

[0094] Where DBf is the actual controller setting value;

[0095] Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is:

[0096]

[0097]

[0098] Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component;

[0099] Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is:

[0100]

[0101]

[0102] Where K w is the fourth proportional coefficient, T lpwi and T w0wi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component;

[0103] Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is:

[0104] P frc =dP f +dP w .

[0105] Optionally, in the above-mentioned system embodiments of the present invention, the secondary frequency regulation model module is based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include:

[0106] Based on the grid frequency measurement value f, the preset frequency reference value f ref Calculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is:

[0107] P ACE =Δf*K F *B IASK +ΔP*K L

[0108]

[0109] Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0110] Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is:

[0111]

[0112] Where K P and K I are the first proportional coefficient and the first integral coefficient respectively;

[0113] For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator;

[0114] The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station R Make a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

[0115] Optionally, in the above-mentioned system embodiments of the present invention, the power control model module includes:

[0116] Active power control model module, used for active power reference value P of electrochemical energy storage power station based on preset refand the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is:

[0117]

[0118]

[0119] Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively;

[0120] Reactive power control model module for electrochemical energy storage power station based on active power P measured from the grid side gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in:

[0121] When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0122]

[0123] Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively;

[0124] When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0125]

[0126] Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor;

[0127] According to the reactive power Qref0 The reactive power Q actually output by the electrochemical energy storage power station is determined by the preset reactive power limit value of the electrochemical energy storage power station. ref , whose expression is:

[0128]

[0129] According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

[0130]

[0131] Optionally, in the above-mentioned system embodiments of the present invention, the battery pack model module is based on the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including:

[0132] According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is:

[0133]

[0134] According to the state of charge SOC(t) and the preset operating range of the energy storage battery state of charge [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where:

[0135] When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0

[0136] When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0;

[0137] When SOC min ≤SOC(t)≤SOC max When I dmin =I dmin0 , I dmax =I dmax0 ;

[0138] Where, I dmin0 and I dmax0 are the preset lower and upper limits of the active current, I dmin and I dmax are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

[0139] Optionally, in the above-mentioned system embodiments of the present invention, the current limiting model module is based on the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include:

[0140] According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in:

[0141]

[0142] According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is:

[0143]

[0144] Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current;

[0145] According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in:

[0146] When active power control mode takes priority,

[0147] I dref =I dref0

[0148]

[0149] When reactive power control mode takes priority:

[0150]

[0151] I qref =I qref0 .

[0152] Optionally, in the above-mentioned system embodiments of the present invention, the grid-connected interface model module is based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is:

[0153]

[0154] Where θ is the measured value of the terminal voltage V t The phase angle.

[0155] Based on the above-mentioned embodiment of the present invention, the electrochemical energy storage power station modeling method and system for large-scale power grid dynamic simulation provided by the above-mentioned embodiment of the present invention collects the grid frequency, the active power output of the electrochemical energy storage power station, the power value of the grid tie line, the grid side terminal voltage, the initial state of charge of the battery pack in the electrochemical energy storage power station, and pre-sets the frequency reference value, the terminal voltage reference value, the new energy power smoothing amount, and the active power reference value of the electrochemical energy storage power station to respectively establish the frequency support model, secondary frequency regulation model, power control model, battery pack model, battery limitation model and grid interface model of the electrochemical energy storage power station. The method and system not only constructs an electromechanical transient and medium- and long-term dynamic simulation model of the electrochemical energy storage power station participating in the multi-scenario regulation of the large power grid, the constructed simulation model can accurately simulate the power response characteristics of the energy storage power station, and is suitable for simulation analysis of typical scenarios in the large power grid, but also constructs a model of the electrochemical energy storage power station participating in the AGC secondary frequency regulation. Compared with conventional units, the energy storage power station can quickly respond to the AGC control instructions and quickly meet the frequency support requirements of the system.

[0156] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0157] The above and other objects, features, and advantages of the present invention will become more apparent through a more detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are provided to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and are not intended to limit the present invention. In the drawings, the same reference numerals generally represent the same components or steps.

[0158] Figure 1It is a flow chart of a method for modeling an electrochemical energy storage power station applicable to dynamic simulation of a large power grid provided by an exemplary embodiment of the present invention;

[0159] FIG2( a ) is a schematic diagram showing a comparison of active power changes when an active power command step response is applied under discharge conditions according to an exemplary embodiment of the present invention;

[0160] FIG2( b ) is a schematic diagram showing a comparison of reactive power changes when an active power command step response is applied under discharge conditions according to an exemplary embodiment of the present invention;

[0161] Figure 3 is a schematic diagram of a reactive power command step response under a discharge condition provided by an exemplary embodiment of the present invention;

[0162] Figure 4 This is a schematic diagram comparing tie-line power changes during AGC secondary frequency regulation of a large power grid provided by an exemplary embodiment of the present invention;

[0163] Figure 5 It is a structural diagram of an electrochemical energy storage power station modeling system suitable for large power grid dynamic simulation provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0164] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0165] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0166] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0167] It should also be understood that, in the embodiments of the present invention, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0168] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0169] In addition, the term "and / or" in this invention merely describes an association relationship between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this invention generally indicates that the related objects are in an "or" relationship.

[0170] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced with each other. For the sake of brevity, they will not be described one by one.

[0171] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0172] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0173] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0174] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0175] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate in conjunction with numerous other general-purpose or specialized computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, among others.

[0176] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system-executable instructions (such as program modules) executed by a computer system. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked via a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media, including storage devices.

[0177] Exemplary Methods

[0178] Figure 1 This is a flow chart of a method for modeling an electrochemical energy storage power station for dynamic simulation of a large power grid provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the following steps are included:

[0179] Step 101: Based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc By constructing a frequency support model, the active power regulation amount of the electrochemical energy storage power station participating in primary frequency regulation and inertia support is determined, which can be used to simulate frequency support scenarios.

[0180] Preferably, based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include:

[0181] Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is:

[0182]

[0183] Where, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0184] Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is:

[0185]

[0186] Where DBf is the actual controller setting value;

[0187] Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is:

[0188]

[0189]

[0190] Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component;

[0191] Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is:

[0192]

[0193]

[0194] Where K w is the fourth proportional coefficient, T lpwi and T w0wi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component;

[0195] Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is:

[0196] P frc =dP f +dP w .

[0197] Step 102: Based on the grid frequency measurement value f and the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc By constructing an electrochemical energy storage power station to participate in the AGC secondary frequency regulation model of the large power grid, it can be used to participate in fixed tie line control and secondary frequency regulation.

[0198] Preferably, based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include:

[0199] Based on the grid frequency measurement value f, the preset frequency reference value f ref Calculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is:

[0200] P ACE =Δf*K F *B IASK +ΔP*K L

[0201]

[0202] Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0203] Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is:

[0204]

[0205] Where K P and K I are the first proportional coefficient and the first integral coefficient respectively;

[0206] For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator;

[0207] The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station RMake a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

[0208] Step 103: Based on the preset active power reference value P of the electrochemical energy storage power station ref , New energy power leveling quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp By building a power control model, it can be used in scenarios of active power control and reactive power control.

[0209] Preferably, based on the preset active power reference value P of the electrochemical energy storage station ref , New energy power leveling quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ,include:

[0210] Based on the preset active power reference value P of the electrochemical energy storage power station ref and the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is:

[0211]

[0212]

[0213] Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively;

[0214] Based on the active power P of the electrochemical energy storage power station measured from the grid side gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in:

[0215] When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0216]

[0217] Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively;

[0218] When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0219]

[0220] Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor;

[0221] According to the reactive power Q ref0 The reactive power Q actually output by the electrochemical energy storage station is determined by the preset reactive power limit value of the electrochemical energy storage station. ref , whose expression is:

[0222]

[0223] According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

[0224]

[0225] Step 104: According to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, the output of which is the active current limit value. By constructing a battery pack module, it can be used to simulate the long-term full charge process of the energy storage battery in the electrochemical energy storage power station.

[0226] Preferably, according to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including:

[0227] According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is:

[0228]

[0229] According to the state of charge SOC(t) and the preset operating range of the energy storage battery state of charge [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where:

[0230] When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0

[0231] When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0;

[0232] When SOC min ≤SOC(t)≤SOC max When I dmin =I dmin0 , I dmax =I dmax0 ;

[0233] Where, I dmin0 and I dmax0are the preset lower and upper limits of the active current, I dmin and I dmax are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

[0234] Step 105: According to the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref By constructing a current limiting model, it can be used to simulate the overcurrent characteristics of an electrochemical energy storage power station.

[0235] Preferably, according to the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include:

[0236] According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in:

[0237]

[0238] According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is:

[0239]

[0240] Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current;

[0241] According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in:

[0242] When active power control mode takes priority,

[0243] I dref =I dref0

[0244]

[0245] When reactive power control mode takes priority:

[0246]

[0247] I qref =I qref0 .

[0248] Step 106: Based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

[0249] Preferably, based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is:

[0250]

[0251] Where θ is the measured value of the terminal voltage V t The phase angle.

[0252] In one implementation, a comparison of electromechanical transient simulation scenarios for an energy storage power station was conducted based on actual waveforms recorded from a grid-connected energy storage power station. The power storage station consisted of eight converters, each with a rated capacity of 2.5 MVA, for a total power station capacity of 20 MVA. The output power response characteristics of one of the converters were compared.

[0253] When the active power command responds in a step manner under the discharge condition, the fault is set to the initial active output of converter No. X of the energy storage power station as 0.5MW, and 0.5MW is used as the step command to gradually increase its active power command to the rated power, and then gradually reduce the active power command to the initial value. The reactive power control mode is set to constant power factor control, and the given power factor is 0.025. Figure 2(a) is a schematic diagram of the comparison of active power changes when the active power command responds in a step manner under the discharge condition provided by an exemplary embodiment of the present invention. As shown in Figure 2(a), the measured active power change curve is basically consistent with the simulated active power change curve. Figure 2(b) is a schematic diagram of the comparison of reactive power changes when the active power command responds in a step manner under the discharge condition provided by an exemplary embodiment of the present invention. As shown in Figure 2(b), the measured reactive power change curve is also basically consistent with the simulated reactive power change curve.

[0254] Figure 3 This is a schematic diagram of the reactive power command step response under discharge conditions provided by an exemplary embodiment of the present invention. The fault is set to the initial active output of the No. X converter of the energy storage power station to be 0.5MW, and the initial reactive output to be 0.025MVar (emitting reactive power). At 18 seconds, the reactive power command value is modified to increase in slope (absorbing reactive power), and is increased to 1MVar (absorbing reactive power) at 17 seconds; and restored to the initial value at 39 seconds according to the slope. Figure 3 As shown in the figure, the measured value of reactive power under active power instruction is basically consistent with the simulation result, which greatly verifies the accuracy of the model.

[0255] In another embodiment, the effectiveness of a model established according to the method described in the present invention in participating in the AGC secondary frequency regulation of a large power grid was verified based on a provincial power grid case study. Based on data from a provincial power grid, a simulation of an electrochemical energy storage power station participating in the AGC secondary frequency regulation function of a large power grid was conducted, with a simulation duration of 600 seconds. The power grid consisted of 28,202 nodes, 2,340 generators, and 34,041 branches. Among them, there were 28,698 MW of conventional units, a load of 32,928 MW, 4,000 MW of DC feed-in power, 1,354 MW of inter-provincial tie-line feed-in power, 2,100 MW of provincial AGC standby power, and a rated capacity of 600 MW for the energy storage power station. A single-pole DC lockout fault was set at 3 seconds, resulting in a grid power loss of 2,000 MW, a minimum system frequency of 49.275 Hz, a peak fluctuation of approximately 1,950 MW on the inter-provincial tie-line, and a significant over-limit of the tie-line transmission power. The AGC secondary frequency regulation function was enabled and set to fixed tie-line power control mode. Two operating conditions were set for comparison. Operating condition 1: The electrochemical energy storage power station participates in AGC secondary frequency regulation; Operating condition 2: The electrochemical energy storage power station does not participate in AGC secondary frequency regulation, and is replaced by a conventional unit of equal capacity to participate in AGC secondary frequency regulation.

[0256] Figure 4This is a comparative diagram of tie line power changes during AGC secondary frequency regulation of a large power grid provided by an exemplary embodiment of the present invention. Figure 4 It can be seen that when the electrochemical energy storage power station participates in the AGC secondary frequency regulation of the large power grid, the power of the tie line increases faster.

[0257] In summary, the electrochemical energy storage power station modeling method for large-scale power grid dynamic simulation provided by the embodiments of the present invention can conveniently simulate the dynamic simulation of electrochemical energy storage power station battery pack charging and discharging scenarios, frequency support scenarios, energy storage power station participation in large-scale power grid AGC secondary frequency regulation scenarios, power control scenarios, and current limiting scenarios. It can be applied to simulation calculations in different simulation scenarios after the electrochemical energy storage power station is connected to the large-scale power grid. Moreover, through functional verification of the simulation model, it is demonstrated that the method described in this embodiment can accurately simulate the power response characteristics of the electrochemical energy storage power station and the operation process of energy storage participating in AGC secondary frequency regulation. In addition, the energy storage has a fast response speed, which can significantly shorten the time required for system frequency and tie line recovery when participating in AGC regulation.

[0258] Exemplary Systems

[0259] Figure 5 FIG. 1 is a schematic diagram of a structure of an electrochemical energy storage power station modeling system suitable for dynamic simulation of a large power grid provided by an exemplary embodiment of the present invention. Figure 5 As shown, the electrochemical energy storage power station modeling system suitable for large power grid dynamic simulation described in this embodiment includes:

[0260] Frequency support model module 501 is used to calculate the frequency support model based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ;

[0261] The secondary frequency modulation model module 502 is used to adjust the frequency of the power grid based on the measured value f and the preset frequency reference value f. ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ;

[0262] The power control model module 503 is used to control the active power reference value P of the electrochemical energy storage power station based on the preset ref , New energy power suppression quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V tEstablish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ;

[0263] The battery pack model module 504 is configured to calculate the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init Establishing a battery pack model, wherein the output of the battery pack model is an active current limit value;

[0264] The current limiting model module 505 is used to calculate the active current component I according to the active current limit value. drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref ;

[0265] The grid interface model module 506 is used to calculate the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

[0266] Preferably, the frequency support model module 501 is based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include:

[0267] Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is:

[0268]

[0269] Where, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0270] Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is:

[0271]

[0272] Where DBf is the actual controller setting value;

[0273] Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is:

[0274]

[0275]

[0276] Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component;

[0277] Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is:

[0278]

[0279]

[0280] Where K w is the fourth proportional coefficient, T lpwi and T wOwi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component;

[0281] Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is:

[0282] P frc =dP f +dP w .

[0283] Preferably, the secondary frequency modulation model module 502 is based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include:

[0284] Based on the grid frequency measurement value f, the preset frequency reference value f refCalculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is:

[0285] P ACE =Δf*K F *B IASK +ΔP*K L

[0286]

[0287] Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor;

[0288] Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is:

[0289]

[0290] Where K P and K I are the first proportional coefficient and the first integral coefficient respectively;

[0291] For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator;

[0292] The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station R Make a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

[0293] Preferably, the power control model module 503 includes:

[0294] Active power control model module 531 is used to control the active power reference value P of the electrochemical energy storage power station based on the preset ref and the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is:

[0295]

[0296]

[0297] Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively;

[0298] Reactive power control model module 532 is used to control the active power P of the electrochemical energy storage power station based on the active power P measured from the grid side. gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in:

[0299] When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0300]

[0301] Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively;

[0302] When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is:

[0303]

[0304] Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor;

[0305] According to the reactive power Q ref0 The reactive power Q actually output by the electrochemical energy storage station is determined by the preset reactive power limit value of the electrochemical energy storage station. ref , whose expression is:

[0306]

[0307] According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

[0308]

[0309] Preferably, the battery pack model module 504 calculates the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including:

[0310] According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is:

[0311]

[0312] According to the state of charge SOC(t) and the preset operating range of the state of charge of the energy storage battery pack [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where:

[0313] When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0

[0314] When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0;

[0315] When SOC nin ≤SOC(t)≤SOC max When I dmin =I dmin0 , I dmax =I dmax0 ;

[0316] Where, I dmin0 and I dmax0 are the preset lower and upper limits of the active current, I dmin and I dmax are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

[0317] Preferably, the current limiting model module 505 is based on the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include:

[0318] According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in:

[0319] According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is:

[0320]

[0321] Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current;

[0322] According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in:

[0323] When active power control mode takes priority,

[0324] I dref =I dref0

[0325]

[0326] When reactive power control mode takes priority:

[0327]

[0328] I qref =I qref0 .

[0329] Preferably, the grid interface model module 506 is based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is:

[0330]

[0331] Where θ is the terminal voltage measurement value V t The phase angle.

[0332] The steps for modeling an electrochemical energy storage power station by the electrochemical energy storage power station modeling system suitable for large power grid dynamic simulation provided in this embodiment are the same as the steps taken by the electrochemical energy storage power station modeling method suitable for large power grid dynamic simulation provided in this embodiment, and the technical effects achieved are also the same, and will not be repeated here.

[0333] In addition to the above-mentioned methods and systems, an embodiment of the present disclosure may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the electrochemical energy storage power station modeling method suitable for large power grid dynamic simulation according to various embodiments of the present disclosure described in the above-mentioned "Exemplary Method" section of this specification.

[0334] The computer program product may be written in any combination of one or more programming languages to implement the operations of the disclosed embodiments, including object-oriented programming languages such as Java, C++, and conventional procedural programming languages such as C or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0335] In addition, an embodiment of the present disclosure may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, causes the processor to execute the steps of the electrochemical energy storage power station modeling method suitable for large power grid dynamic simulation according to various embodiments of the present disclosure described in the above "Exemplary Method" section of this specification.

[0336] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0337] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0338] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference can be made to the descriptions of the identical or similar parts between the various embodiments. For system embodiments, since they are essentially identical to the method embodiments, their description is relatively simple. For relevant parts, refer to the descriptions of the method embodiments.

[0339] The block diagrams of the devices, devices, equipment, and systems involved in this disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0340] The methods and apparatus of the present disclosure may be implemented in many ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless otherwise specified. In addition, in some embodiments, the present disclosure may also be implemented as programs recorded in a recording medium, which include machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers recording media that store programs for executing the methods according to the present disclosure.

[0341] It should also be noted that, in the apparatus, equipment and method of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present disclosure. The above description of the disclosed aspects is provided to enable any technician in this field to make or use the present disclosure. Various modifications to these aspects will be very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown here, but to the widest range consistent with the principles and novel features disclosed herein.

[0342] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A modeling method for an electrochemical energy storage power station suitable for dynamic simulation of a large power grid, characterized in that: The method comprises: Based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ; Based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ; Based on the preset active power reference value P of the electrochemical energy storage power station ref , New energy power suppression quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ; According to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init Establishing a battery pack model, wherein the output of the battery pack model is an active current limit value; According to the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref ; Based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

2. The method according to claim 1, characterized in that Based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include: Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is: Where, T pe is the measurement time constant, s is the frequency domain calculation factor; Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is: Where DBf is the actual controller setting value; Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is: Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component; Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is: Where K w is the fourth proportional coefficient, T lpwi and T w0wi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component; Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is: P frc =dP f +dP w 。 3. The method according to claim 1, characterized in that Based on the grid frequency measurement value f, the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include: Based on the grid frequency measurement value f, the preset frequency reference value f ref Calculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is: P ACE =Δf*K F *B IASK +ΔP*K L Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor; Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is: Where K P and K I are the first proportional coefficient and the first integral coefficient respectively; For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator; The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station R Make a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

4. The method according to claim 1, wherein Based on the preset active power reference value P of the electrochemical energy storage power station ref , New energy power leveling quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ,include: Based on the preset active power reference value P of the electrochemical energy storage power station ref and the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is: Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively; Based on the active power P of the electrochemical energy storage power station measured from the grid side gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in: When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is: Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively; When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is: Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor; According to the reactive power Q ref0 The reactive power Q actually output by the electrochemical energy storage station is determined by the preset reactive power limit value of the electrochemical energy storage station. ref , whose expression is: According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

5. The method according to claim 1, wherein According to the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including: According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is: According to the state of charge SOC(t) and the preset operating range of the state of charge of the energy storage battery pack [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where: When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0 When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0; Our SOC min ≤SOC(t)≤SOC max time, I dmin =I dmin0 , I dmax =I dmax0 ; Where, I dmin0 and I dmax0 are the preset lower and upper limits of the active current, I dmin and I dma are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

6. The method according to claim 5, characterized in that According to the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include: According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in: According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is: Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current; According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in: When active power control mode takes priority, I dref =I dref0 When reactive power control mode takes priority: I qref =I qref0 。 7. The method according to claim 1, characterized in that Based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is: Where θ is the terminal voltage measurement value V t The phase angle.

8. An electrochemical energy storage power station modeling system suitable for dynamic simulation of large power grids, characterized in that: The system comprises: Frequency support model module, used to support the frequency of the grid based on the measured value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ; Secondary frequency regulation model module, used to adjust the frequency based on the grid frequency measurement value f and the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ; Power control model module, used for active power reference value P of electrochemical energy storage power station based on preset ref , New energy power suppression quantity P aux And the terminal voltage reference value V ref , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t Establish a power control model, the output of which is the active current component I drefp and reactive current component I qrefp ; The battery pack model module is used to calculate the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init Establishing a battery pack model, wherein the output of the battery pack model is an active current limit value; The current limiting model module is used to calculate the active current component I according to the active current limit value. drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref ; The grid interface model module is used to calculate the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y .

9. The system according to claim 8, characterized in that The frequency support model module is based on the grid frequency measurement value f and the preset frequency reference value f ref Establish a frequency support model, the output of which is the frequency support adjustment value P frc ,include: Based on the grid frequency measurement value f and the preset frequency reference value f ref Calculate the frequency deviation Δf, the calculation formula is: Where, T pe is the measurement time constant, s is the frequency domain calculation factor; Calculate the frequency deviation Δf after the frequency action dead zone limit based on the frequency deviation Δf b , and its calculation formula is: Where DBf is the actual controller setting value; Based on the frequency deviation Δf b The primary frequency modulation component dP is determined by the preset primary frequency modulation component limit value f , and its calculation formula is: Where, DPDF up is the proportional coefficient under positive frequency deviation conditions; DPDF dn is the proportional coefficient under negative frequency deviation conditions; DP min is the lower limit amplitude of the primary frequency modulation component, DP max is the upper limit amplitude of the primary frequency modulation component; Based on the frequency deviation Δf b And the preset inertia support component limit value determines the primary inertia support component dP w , and its calculation formula is: Where K w is the fourth proportional coefficient, T lpwi and T w0wi are controller time constants; P mnwl is the lower limit of the inertia support component, P mxwl is the upper limit amplitude of the inertia support component; Based on the primary frequency modulation component dP f and the inertial support component dP w Calculate the frequency support adjustment amount P frc , and its calculation formula is: P frc =dP f +dP w 。 10. The system according to claim 8, wherein: The secondary frequency regulation model module is based on the grid frequency measurement value f and the preset frequency reference value f ref The secondary frequency regulation model is established with the power value of the grid tie line ΔP. The output of the secondary frequency regulation model is the frequency regulation power adjustment value P agc ,include: Based on the grid frequency measurement value f, the preset frequency reference value f ref Calculate the regional power deviation P by using the power value of the grid tie line ΔP ACE , and its calculation formula is: P ACE =Δf*K F *B IASK +ΔP*K L Where K F is the frequency component coefficient, B IASK is the frequency deviation coefficient, K L is the tie line component coefficient, T pe is the measurement time constant, s is the frequency domain calculation factor; Based on the regional power deviation P ACE Calculate the regional power regulation value P ARR , and its calculation formula is: Where K P and K I are the first proportional coefficient and the first integral coefficient respectively; For several electrochemical energy storage power stations connected to the large power grid, the regional power regulation quantity P ARR After frequency division control and regulation amount distribution, the power regulation amount P allocated to each electrochemical energy storage power station is determined. R , where the frequency division control is used to divide the regulation amount into different frequency groups, the power regulation amount of the high-frequency group is sent to the electrochemical energy storage power station, and the regulation amount of the low-frequency group is sent to the conventional generator; The power regulation amount P allocated to each electrochemical energy storage power station R After the dead zone check, adjustment step check and output check, the frequency regulation power adjustment amount P of each electrochemical energy storage power station is determined according to the preset adjustment amount allocation rule. agc , where the dead zone check and adjustment step length check are for the power adjustment amount P allocated to each electrochemical energy storage power station R Make a judgment, if the power adjustment amount P R If the power regulation value is less than the preset dead zone threshold, the corresponding electrochemical energy storage power station will abandon the power regulation value P. R , if the power adjustment amount P R If the step length is greater than the adjustment amount corresponding to the maximum adjustment step length, the power adjustment amount P R Limiting and output verification are carried out to protect the unit and avoid invalid actions.

11. The system according to claim 8, wherein: The power control model module includes: Active power control model module, used for active power reference value P of electrochemical energy storage power station based on preset ref and the new energy power suppression quantity P aux , and frequency support adjustment amount P frc , FM power regulation amount P agc , the active power P of the electrochemical energy storage power station measured from the grid side gen and the measured voltage value V t An active power control model is established, the output of which is the active current component I drefp , and its calculation formula is: Where T1 and T2 are the first inertia time constant and the second inertia time constant respectively, K Ip and K pp are the second proportional coefficient and the second integral coefficient respectively; Reactive power control model module for electrochemical energy storage power station based on active power P measured from the grid side gen , Grid side terminal voltage measurement value V t and the preset terminal voltage reference value V ref Establish a reactive power control model, the output of which is the reactive current component I qrefp ,in: When constant AC voltage control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is: Where, T r and T v are the third inertia time constant and the fourth inertia time constant, K pv and K vi are the third proportional coefficient and the third integral coefficient respectively; When constant power factor control is performed, the reactive power Q output by the electrochemical energy storage power station is theoretically ref0 The calculation formula is: Where, T PE is the fifth inertia time constant, PF ref is the preset initial power factor; According to the reactive power Q ref0 The reactive power Q actually output by the electrochemical energy storage station is determined by the preset reactive power limit value of the electrochemical energy storage station. ref , whose expression is: According to the reactive power Q ref and terminal voltage V t Calculate the reactive current component I qrefp , and its calculation formula is:

12. The system according to claim 8, wherein: The battery pack model module calculates the active power P gen And the initial state of charge SOC of the energy storage battery pack in the electrochemical energy storage power station init A battery pack model is established, wherein the output of the battery pack model is an active current limit value including: According to the active power P gen And the state of charge SOC of the energy storage battery pack at the initial moment in each energy storage system init , calculate the state of charge SOC(t) at any time t during the charging and discharging process of the energy storage battery pack. The calculation formula is: According to the state of charge SOC(t) and the preset operating range of the state of charge of the energy storage battery pack [SOC min , SOC max ], determine the active current limit value of the energy storage battery pack charging and discharging at time t, where: When SOC(t)>SOC max When I dmin =0,I dmax =I dmax0 When SOC(t)<SOC min When I dmin =I dmin0 , I dmax =0; Our SOC min ≤SOC(t)≤SOC max time, I dmin =I dmin0 , I dmax =I dmax0 ; Where, I dmin0 and I dmax0 are the preset lower and upper limits of the active current, I dmin and I dmax are the lower limit and upper limit of the active current charging and discharging of the energy storage battery pack at time t.

13. The system according to claim 12, wherein: The current limiting model module is based on the active current limit value, the active current component I drefp , reactive current component I qrefp and the preset reactive current limit value to establish a current limiting model, the output of the current limiting model is the active current component I dref and reactive current component I qref include: According to the active current limit value and the active current component I drefp Calculate the active current component I dref0 ,in: According to the reactive current component I qrefp and the preset reactive current limit value to calculate the reactive current component I qref0 , and its calculation formula is: Where, I qmin and I qmax are respectively the preset lower limit and upper limit of reactive current; According to the active current component I dref0 , I qref0 and the preset maximum converter current value I max Calculate the active current component I output by the electrochemical energy storage station dref and reactive current component I qref ,in: When active power control mode takes priority, I dref =I dref0 When reactive power control mode takes priority: I qref =I qref0 。 14. The system according to claim 8, wherein: The grid interface model module is based on the active current component I drefp and reactive current component I qrefp Establish a grid-connected interface model, the output of which is the active current component I in the xy coordinate system x and reactive current component I y , and its calculation formula is: Where θ is the terminal voltage measurement value V t The phase angle.

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