Main network and distribution network combined secondary frequency modulation method considering distributed resource aggregation control

Abstract

The invention discloses a main and distribution network joint secondary frequency modulation method considering distributed resource aggregation control, which comprises the following steps: building a framework to obtain an information exchange platform; a plurality of distribution networks with distributed resources are connected to a plurality of nodes of a main network, and then are connected to a power system network; synchronizing information exchange of the control center, the distribution network and the main network, and determining a simulation time step length of information exchange between federates; establishing a secondary frequency modulation instruction issued by the control center to the main network and the distribution network by using the information exchange platform; based on the frequency modulation result, generator tripping disturbance is set, and dynamic calculation is carried out; and compared with a traditional unit which participates in secondary frequency modulation independently, the effect of the distributed resources participating in the secondary frequency modulation is evaluated. According to the method, the reasonable application of the available capacity of the distributed resources, the process that the distributed resources participate in secondary frequency modulation and the process that the power grid frequency rapidly recovers to the normal level after the power generation side fluctuates are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems and automation thereof, and in particular to a main distribution network joint secondary frequency regulation method taking into account distributed resource aggregation control. Background Art

[0002] Traditional power systems are highly dependent on centralized large-scale power generation resources and fossil energy. Under the pressure of energy transformation and environmental protection, their sustainability faces huge challenges. In today's power sector, with the transformation and upgrading of traditional power systems to new power systems, the access of distributed resources to the power grid is becoming a major development trend. Distributed resources have the advantages of rapid response and interruptibility. Reasonable use can improve the frequency stability of the power grid, reduce dependence on traditional centralized power generation resources, and achieve more flexible and efficient power system operation. But at the same time, the access of distributed resources to the power grid has brought considerable challenges to the balance of the power system and the stability of the system frequency. If distributed resources are not properly managed, it will not only seriously affect the voltage of the local distribution network, but also destroy the power balance of the transmission system. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a main and distribution network joint secondary frequency regulation method taking into account distributed resource aggregation control. The present invention realizes the rational use of the available capacity of distributed resources, the process of distributed resources participating in secondary frequency regulation, and the process of the grid frequency quickly returning to normal levels after being affected by fluctuations on the power generation side.

[0004] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0005] The present invention is a main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control, including the following operations:

[0006] Build a framework, including determining the publishing and subscription parameters of the control center, distribution network, and main network, using the simulation platform to federate the control center, main network, and distribution network, and build an information exchange platform;

[0007] Connect several distribution networks with distributed resources to several nodes of the main network and to the power system network;

[0008] Synchronize the information exchange between the control center, distribution network and main network, and determine the simulation time step for information exchange between each federation;

[0009] Based on the simulation time step and information exchange platform of the control center, the distribution network and the main network, the control center issues secondary frequency modulation instructions to the main network and the distribution network, and the main network and the distribution network perform secondary frequency modulation according to the secondary frequency modulation instructions;

[0010] Based on the frequency regulation results, set the generator tripping disturbance, perform dynamic calculations, and monitor the available capacity of distributed resources in the distribution network and the changes in grid frequency;

[0011] Compared with the traditional units participating in secondary frequency regulation alone, the effect of distributed resources participating in secondary frequency regulation is evaluated.

[0012] A further improvement of the present invention is that the simulation platform is the HELICS platform of the access transmission dynamic simulation tool ANDES and the distribution network solver OpenDSS.

[0013] A further improvement of the present invention is that the specific operation of building the framework includes:

[0014] Configure the corresponding json files for the control center, main network and distribution network respectively, and determine the publishing parameters and subscription parameters of the control center, distribution network and main network. Among them, the publishing parameters of the control center are the secondary frequency modulation instructions, the subscription parameters of the control center are the available capacity of distributed resources from the distribution network and the grid frequency from the main network, the publishing parameters of the distribution network are the active power and available capacity, the subscription parameters of the distribution network are the secondary frequency modulation instructions from the control center and the node voltage from the main network, the publishing parameters of the main network are the node voltage and grid frequency, and the subscription parameters of the main network are the secondary frequency modulation instructions from the control center and the active power from the distribution network;

[0015] The HELICS platform is used to federate the control center, main network and distribution network, build a framework for mutual communication, and obtain an information exchange platform.

[0016] A further improvement of the present invention is to connect several distribution networks with distributed resources to several nodes of the main network and to the power system network, specifically including:

[0017] Select several nodes in the main network, and ensure that the total power of each selected node is greater than the power reserved by the distributed resources, connect the configured distribution networks with distributed resources to several nodes in the selected main network, and then connect to the power system network, where the total power of each selected node is greater than the power capacity reserved by the distributed resources, and the calculation expression of the active power P of each branch is:

[0018] P=(P 0 -P RES )+P DER (1)

[0019] Among them, P 0 is the original active power of the node, P DER is the actual power consumed by the distributed resource load in the distribution network, P RES Reserve capacity for distributed resources.

[0020] A further improvement of the present invention is that the simulation time step of information exchange between each federation is determined by:

[0021] The control center issues a secondary frequency modulation command every t 1 seconds to the conventional generators in the main grid and the distributed resources in the distribution grid. The conventional generators and distributed resources are sent every t 2 Seconds through power adjustment to execute the secondary frequency modulation command, where the distribution network calculates the active power after distributed resource adjustment, every t 3 seconds to the main grid, which calculates the grid frequency. 2 seconds to the control center; the main network calculates the node voltage of each distribution network, and sends it to the control center every t 3 seconds to each distribution network, where t 1 Greater than t 3 Greater than t 2 .

[0022] A further improvement of the present invention is to establish a secondary frequency modulation instruction issued by the control center to the main network and the distribution network based on the simulation time step and information exchange platform of the information exchange between the control center, the distribution network and the main network, specifically including:

[0023] Calculate the regional control error, the expression is:

[0024] ACE=γB(ff 0 )(2)

[0025] Among them, ACE is the regional control error, γ is the amplification factor, B is the frequency deviation coefficient, f0 is the rated frequency of the power grid, and f is the power grid frequency;

[0026] The regional control error is used as the adjustment signal, and the secondary frequency modulation command is calculated using the PI controller. The expression is:

[0027]

[0028] Among them, K p is the proportional gain, K i is the integral gain, ACE(t) is the area control error at time t, and ΔP is the power change;

[0029] The power variation ΔP is distributed, including increasing the active power output of each conventional generator set in the main grid and reducing the active power consumption of distributed resources in each distribution network:

[0030] P CGU =P 01 +ΔP / n 1 α (4)

[0031] P DER =P 02 -ΔP / n2 ·(1-α) (5)

[0032] Among them, Po 1 is the active power generated by each conventional generator set before executing the secondary frequency regulation command, n 1 is the number of conventional generator sets, α is the distribution coefficient of power variation ΔP between conventional generator sets and distributed energy, P 02 is the active power consumed by distributed resources in each distribution network before executing the secondary frequency modulation command, n 2 is the number of distribution networks, P CGU is the active power output of the conventional generator set, P DER It is the actual power consumed by the distributed resource load in the distribution network.

[0033] A further improvement of the present invention is that the expression for dynamic calculation is:

[0034]

[0035]

[0036] Among them, P i is the active power of node i, Q i is the reactive power of node i, V i is the voltage amplitude of node i, V j is the voltage amplitude at node j, G ij is the real part of the admittance of the line between node i and node j, B ij is the imaginary part of the admittance of the line between node i and node j, θ ij is the phase angle difference between node i and node j, I i is the current flowing into node i, Y ij is the admittance between node i and node j, and n is the number of nodes.

[0037] A further improvement of the present invention is to evaluate the effect of distributed resources participating in secondary frequency regulation in comparison with the traditional units participating in secondary frequency regulation alone, specifically including:

[0038] Three evaluation parameters are set, including frequency deviation Δf, stabilization time T, and distributed resource utilization η;

[0039] The three evaluation parameters are used to establish a comprehensive evaluation model S, and the expression of the comprehensive evaluation model S is:

[0040] S=ω T ·T i +ω f Δf i +ω η ·η i (9)

[0041]

[0042] η i =η (12)

[0043] ω T +ω f +ω η =1 (13)

[0044] Among them, T i , Δf i and η i are the index values ​​of stabilization time T, frequency deviation Δf, and distributed resource utilization η, ω T ,ω f and ω η T i , Δf i and η i The weight parameter, T max and T min is the maximum and minimum value of the stabilization time T, Δf max and Δf min are the maximum and minimum values ​​of the frequency deviation Δf.

[0045] The main distribution network combined secondary frequency modulation system of the present invention taking into account distributed resource aggregation control comprises: a network interface, a memory and a processor; wherein the network interface is used to receive and send signals in the process of sending and receiving information between other external network elements;

[0046] The memory is used to store a computer program that can be run on the processor;

[0047] The processor is used to execute the steps of the above-mentioned main and distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control when running the computer program.

[0048] A computer storage medium of the present invention stores a program for main and distribution network joint secondary frequency modulation taking into account distributed resource aggregation control, and when the program for main and distribution network joint secondary frequency modulation taking into account distributed resource aggregation control is executed by at least one processor, the steps of the above-mentioned method for main and distribution network joint secondary frequency modulation taking into account distributed resource aggregation control are implemented.

[0049] The beneficial effects of the present invention are as follows: the present invention incorporates distributed resources into the distribution network category, overcoming the differences in simulation time scales and the complexity of system coupling. Traditional methods often do not consider the distribution network layer, but directly equate distributed resources to the main network nodes, ignoring the complex architecture and dynamic characteristics of the distribution network, and failing to simulate the problem of the real power flow distribution between the main and distribution networks. The present invention uses the dynamic joint simulation research of the main and distribution networks, and on this basis realizes the reasonable use of the available capacity of distributed resources, the process of distributed resources participating in secondary frequency modulation, and the process of the grid frequency quickly returning to normal levels after being affected by fluctuations on the power generation side. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of information interaction of an information exchange platform in an embodiment of the present invention;

[0051] Figure 2 is a graph showing changes in the AGC instructions over time in an embodiment of the present invention;

[0052] Figure 3 is a curve diagram of the available capacity of distributed resources in any distribution network in an embodiment of the present invention;

[0053] Figure 4 is a frequency variation curve of a power grid in which distributed resources participate in secondary frequency modulation in an embodiment of the present invention;

[0054] Figure 5 It is a frequency variation curve of a power grid in which only conventional generator sets participate in secondary frequency regulation in an embodiment of the present invention;

[0055] Figure 6 This is a comparison of two methods based on the comprehensive evaluation model in the embodiments of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0057] In order to consider how distributed resources in the transmission and distribution network participate in the secondary frequency regulation process, an efficient open source transmission and distribution dynamic joint simulation framework is particularly important. HELICS, as an open source network-physical joint simulation framework for energy systems, can exchange transmission and distribution joint simulation information and provide interfaces. The high-performance transmission dynamic simulation tool ANDES and the distribution network solver OpenDSS are connected to HELICS at the same time to build a joint simulation platform, and then the distributed resource aggregation control participating in the secondary frequency regulation is considered in the joint simulation platform.

[0058] The main distribution network joint secondary frequency modulation method considering distributed resource aggregation control in this embodiment includes the following operations:

[0059] Step 1: Build a framework, including determining the publishing and subscription parameters of the control center, distribution network, and main network, and using the HELICS platform that simultaneously accesses the transmission dynamic simulation tool ANDES and the distribution network solver OpenDSS to federate the control center, main network, and distribution network to build an information exchange platform. The specific steps include the following:

[0060] Step 1.1, configure the corresponding json files for the control center, main network and distribution network respectively, determine the publishing parameters and subscription parameters of the control center, distribution network and main network, among which the publishing parameters of the control center are the secondary frequency modulation instructions, the subscription parameters of the control center are the available capacity of the distributed resources from the distribution network and the frequency from the main network, the publishing parameters of the distribution network are the active power and available capacity, the subscription parameters of the distribution network are the secondary frequency modulation instructions from the control center and the node voltage from the main network, the publishing parameters of the main network are the node voltage and grid frequency, and the subscription parameters of the main network are the secondary frequency modulation instructions from the control center and the active power from the distribution network;

[0061] Step 1.2, use the HELICS platform to federate the control center, main network and distribution network, build a framework for mutual communication, and obtain an information exchange platform so that it can exchange information in real time. The information exchange platform of this embodiment exchanges information in the following way: Figure 1 shown.

[0062] Step 2: Select several nodes in the main network, connect the configured distribution networks with distributed resources to the selected nodes in the main network, and then connect them to the power system network. The total power of each selected node is greater than the power reserved by the distributed resources. The calculation expression of the active power P of each branch after replacement is:

[0063] P=(P 0 -P REs )+P DER (1)

[0064] Among them, P 0 is the original active power of the node, P DER It is the actual power consumed by the distributed resource load in the distribution network, and this value is controlled by the secondary frequency regulation command of the control center, and the load can be reduced according to the grid frequency requirements.

[0065] Step 3: Synchronize the information exchange between the control center, distribution network and main network, and determine the simulation time step of information exchange between each federation.1 seconds to the conventional generators in the main grid and the distributed resources in the distribution grid. The conventional generators and distributed resources are sent every t 2 The automatic power generation control signal is executed through power adjustment in seconds, where the distribution network calculates the adjusted active power of distributed resources, and each t 3 seconds to the main grid; the main grid calculates the grid frequency, every t 2 seconds to the control center; the main network calculates the node voltage of each distribution network, and sends it to the control center every t 3 seconds to each distribution network. 1 Greater than t 3 Greater than t 2 Under the premise of 1 ,t 2 and t 3 It can be adjusted according to actual conditions.

[0066] Step 4: Based on the simulation time step and information exchange platform of the control center, the distribution network and the main network, the control center issues a secondary frequency modulation instruction to the main network and the distribution network. The main network and the distribution network perform secondary frequency modulation according to the secondary frequency modulation instruction. In addition, before the secondary frequency modulation, the control center performs primary frequency modulation using droop control.

[0067] Step 4.1, calculate the area control error (ACE), which is mainly related to the current grid frequency f. The expression is:

[0068] ACE=γB(ff 0 )(2)

[0069] Among them, ACE is the area control error, γ is the amplification factor, B is the frequency deviation coefficient, f0 is the rated frequency of the power grid, and f is the power grid frequency.

[0070] Step 4.2, taking the regional control error as the adjustment signal, the PI controller is used to calculate the secondary frequency modulation command, that is, the AGC frequency modulation command. The expression of the power change ΔP that the power system needs to adjust is:

[0071]

[0072] Among them, K p is the proportional gain, K i is the integral gain, ACE(t) is the area control error at time t, and ΔP is the power change.

[0073] Step 4.3 distributes the power change ΔP. Since only the sudden drop in grid frequency is considered, it is manifested as increasing the active power output of each conventional generator set in the main grid and reducing the active power consumption of distributed resources in each distribution network:

[0074] P CGU =P 01 +ΔP / n 1 α (4)

[0075] P DER =P 02 -ΔP / n 2 ·(1-α) (5)

[0076] Among them, P 01 is the active power generated by each conventional generator set before executing the secondary frequency regulation command, n 1 is the number of conventional generator sets, α is the distribution coefficient of power variation ΔP between conventional generator sets and distributed energy, P 02 is the active power consumed by distributed resources in each distribution network before executing the secondary frequency modulation command, n 2 is the number of distribution networks, P CGU is the active power output of the conventional generator set, P DER It is the actual power consumed by the distributed resource load in the distribution network.

[0077] Step 5: Based on the frequency regulation results, the generator tripping disturbance is set, dynamic calculation is performed, and the available capacity of distributed resources in the distribution network and the changes in the grid frequency are monitored.

[0078]

[0079]

[0080] Among them, P i is the active power of node i, Q i is the reactive power of node i, V i is the voltage amplitude of node i, V j is the voltage amplitude at node j, G ij is the real part of the admittance of the line between node i and node j, B ij is the imaginary part of the admittance of the line between node i and node j, θ ij is the phase angle difference between node i and node j, I i is the current flowing into node i, Y ij is the admittance between node i and node j, and n is the number of nodes.

[0081] Step 6: In order to evaluate the effect of the participation of distributed resources in the frequency regulation process, the effect of the participation of distributed resources in the secondary frequency regulation is compared with the participation of traditional units alone in the secondary frequency regulation, and the effect of the participation of distributed resources in the secondary frequency regulation is evaluated.

[0082] This embodiment sets the time step from the start of the secondary frequency modulation, the frequency reaches the rated frequency and recovers stability, that is, the stabilization time T, the difference from the rated frequency in the final stable state, that is, the frequency deviation Δf, and the utilization rate of the available capacity of distributed resources in the distribution network, that is, the distributed resource utilization rate η. The three evaluation parameters are used to establish a comprehensive evaluation model S, and the expression of the comprehensive evaluation model S is:

[0083] S=ω T ·T i +ω f Δf i +ω η ·η i (9)

[0084]

[0085] η i =η (12)

[0086] ω T +ω f +ω η =1 (13)

[0087] Among them, T i , Δf i and η i are the index values ​​of stabilization time T, frequency deviation Δf, and distributed resource utilization η, ω T ,ω f and ω η T i , Δf i and η i The weight parameter, T max and T min is the maximum and minimum value of the stabilization time T, Δf max and Δf min are the maximum and minimum values ​​of the frequency deviation Δf.

[0088] The generator tripping operation is performed at the set time, and the power flow calculation of this embodiment is used to obtain the AGC frequency modulation instruction, the available capacity of the distributed resources in the distribution network, and the changes in the grid frequency are as follows: Figure 2 , 3 , as shown in Figure 4.

[0089] The secondary frequency regulation effect achieved by using the conventional generator set single secondary frequency regulation method for power flow calculation is as follows: Figure 5 As shown. Combined Figure 4 and Figure 5 As shown, compared with the secondary frequency regulation of conventional generator sets alone, the distributed resource participation in the secondary frequency regulation method in this embodiment has little difference in the final frequency deviation, but the frequency regulation time is significantly improved.

[0090] This embodiment uses the proposed comprehensive evaluation model S to evaluate the results and compares them with the results of the conventional generator set single secondary frequency regulation method to obtain the index values ​​of frequency deviation Δf, stabilization time T, distributed resource utilization rate η and the comprehensive score S as shown in the figure: Figure 6 Compared with the conventional generator set single secondary frequency regulation method, the distributed resource participation secondary frequency regulation method has little difference in the final frequency deviation, but is significantly better in terms of stabilization time and distributed resource utilization, and the final comprehensive score is about 46.3% higher than the conventional generator set single secondary frequency regulation method.

[0091] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have the same meaning as in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined similarly here.

[0092] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control, characterized in that: The following operations are included: Build a framework, including determining the publishing and subscription parameters of the control center, distribution network, and main network, using the simulation platform to federate the control center, main network, and distribution network, and build an information exchange platform; Connect several distribution networks with distributed resources to several nodes of the main network and to the power system network; Synchronize the information exchange between the control center, distribution network and main network, and determine the simulation time step for information exchange between each federation; Based on the simulation time step and information exchange platform of the control center, the distribution network and the main network, the control center issues secondary frequency modulation instructions to the main network and the distribution network, and the main network and the distribution network perform secondary frequency modulation according to the secondary frequency modulation instructions; Based on the frequency regulation results, set the generator tripping disturbance, perform dynamic calculations, and monitor the available capacity of distributed resources in the distribution network and the changes in grid frequency; Compared with the traditional units participating in secondary frequency regulation alone, the effect of distributed resources participating in secondary frequency regulation is evaluated.

2. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The simulation platform is the HELICS platform of the access transmission dynamic simulation tool ANDES and the distribution network solver OpenDSS.

3. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 2 is characterized by: The specific operations of building the framework include: Configure the corresponding json files for the control center, main network and distribution network respectively, and determine the publishing parameters and subscription parameters of the control center, distribution network and main network. Among them, the publishing parameters of the control center are the secondary frequency modulation instructions, the subscription parameters of the control center are the available capacity of distributed resources from the distribution network and the grid frequency from the main network, the publishing parameters of the distribution network are the active power and available capacity, the subscription parameters of the distribution network are the secondary frequency modulation instructions from the control center and the node voltage from the main network, the publishing parameters of the main network are the node voltage and grid frequency, and the subscription parameters of the main network are the secondary frequency modulation instructions from the control center and the active power from the distribution network; The HELICS platform is used to federate the control center, main network and distribution network, build a framework for mutual communication, and obtain an information exchange platform.

4. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The step of connecting several distribution networks with distributed resources to several nodes of the main network and to the power system network specifically includes: Select several nodes in the main network, connect several configured distribution networks with distributed resources to several nodes in the selected main network, and then connect to the power system network. The total power of each selected node is greater than the power reserved by the distributed resources. The calculation expression of the active power P of each branch is: P=(P0-P REs )+P DER (1) Among them, P0 is the original active power of the node, P DER is the actual power consumed by the distributed resource load in the distribution network, P REs Reserve capacity for distributed resources.

5. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The simulation time step for information exchange between each federation is determined as follows: The control center issues secondary frequency modulation instructions, which are sent to conventional generators in the main grid and distributed resources in the distribution grid every t1 seconds. Conventional generators and distributed resources execute secondary frequency modulation instructions through power adjustment every t2 seconds. The distribution grid calculates the adjusted active power of distributed resources and sends it to the main grid every t3 seconds. The main grid calculates the grid frequency and sends it to the control center every t2 seconds. The main grid calculates the node voltage of each distribution grid and sends it to each distribution grid every t3 seconds, where t1 is greater than t3 and greater than t2.

6. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The simulation time step and information exchange platform based on the information exchange between the control center, the distribution network and the main network establish the secondary frequency modulation instructions issued by the control center to the main network and the distribution network, specifically including: Calculate the regional control error, the expression is: ACE=γB(f-f0) (2) Among them, ACE is the regional control error, γ is the amplification factor, B is the frequency deviation coefficient, f0 is the rated frequency of the power grid, and f is the current power grid frequency; The regional control error is used as the adjustment signal, and the secondary frequency modulation command is calculated using the PI controller. The expression is: Among them, K p is the proportional gain, K i is the integral gain, ACE(t) is the area control error at time t, and ΔP is the power change; The power variation ΔP is distributed, including increasing the active power output of each conventional generator set in the main grid and reducing the active power consumption of distributed resources in each distribution network: P CGU =P 01 +ΔP / n1·α (4) P DER =P 02 -ΔP / n2·(1-a) (5) Among them, P 01 is the active power generated by each conventional generator set before executing the secondary frequency regulation command, n1 is the number of conventional generator sets, α is the distribution coefficient of the power change ΔP between conventional generator sets and distributed energy resources, P 02 is the active power consumed by distributed resources in each distribution network before executing the secondary frequency modulation command, n2 is the number of distribution networks, P CGU is the active power output of the conventional generator set, P DER It is the actual power consumed by the distributed resource load in the distribution network.

7. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The expression of the dynamic calculation is: Among them, P i is the active power of node i, Q i is the reactive power of node i, V i is the voltage amplitude of node i, V j is the voltage amplitude at node j, G ij is the real part of the admittance of the line between node i and node j, B ij is the imaginary part of the admittance of the line between node i and node j, θ ij is the phase angle difference between node i and node j, I i is the current flowing into node i, Y ij is the admittance between node i and node j, and n is the number of nodes.

8. The main distribution network joint secondary frequency modulation method taking into account distributed resource aggregation control according to claim 1 is characterized by: The above is compared with the traditional unit participating in the secondary frequency regulation alone, and the effect of the distributed resources participating in the secondary frequency regulation is evaluated, including: Three evaluation parameters are set, including frequency deviation Δf, stabilization time T, and distributed resource utilization η; The three evaluation parameters are used to establish a comprehensive evaluation model S, and the expression of the comprehensive evaluation model S is: S=ω T ·T i +oh f ·Δf i +oh η ·or i (9) or i =h (12) oh T +oh f +oh η =1 (13) Among them, T i , Δf i and η i are the index values ​​of stabilization time T, frequency deviation Δf, and distributed resource utilization η, ω T ,ω f and ω η T i , Δf i and η i The weight parameter, T max and T min is the maximum and minimum value of the stabilization time T, Δf max and Δf min are the maximum and minimum values ​​of the frequency deviation Δf.

9. A main distribution network combined with a secondary frequency modulation system taking into account distributed resource aggregation control, characterized in that: The system comprises: a network interface, a memory and a processor; wherein the network interface is used to receive and send signals during the process of sending and receiving information with other external network elements; The memory is used to store a computer program that can be run on the processor; The processor is used to execute the steps of the main and distribution network joint secondary frequency regulation method taking into account distributed resource aggregation control as described in any one of claims 1 to 8 when running the computer program.

10. A computer storage medium, characterized in that: The computer storage medium stores a program for the joint secondary frequency modulation of the main distribution network taking into account the distributed resource aggregation control. When the program for the joint secondary frequency modulation of the main distribution network taking into account the distributed resource aggregation control is executed by at least one processor, the steps of the method for the joint secondary frequency modulation of the main distribution network taking into account the distributed resource aggregation control as described in any one of claims 1 to 8 are implemented.

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