Multi-resource distributed cooperative control method for AC / DC hybrid power distribution network

Abstract

The invention discloses a multi-resource distributed cooperative control method for an alternating current and direct current hybrid power distribution network, relates to the technical field of power distribution network fault recovery, and provides a multi-region multi-stage multi-resource distributed cooperative control method based on a post-disaster alternating current and direct current hybrid power distribution network. A multi-stage action process of fault recovery is provided from the perspective of cooperative control of multiple inverters, and then distributed cooperative controllers of different types of resources in the alternating current and direct current hybrid power distribution network are designed, so that stable proceeding of different stages of cooperative control of the multiple inverters in the recovery process of the alternating current and direct current hybrid power distribution network after disasters is realized. The method solves a problem that a conventional fault recovery control technology does not fully consider the multi-region, multi-stage and multi-resource distributed cooperative fault recovery of the AC / DC hybrid power distribution network, provides technical support for post-disaster multi-stage dynamic cooperative recovery of the AC / DC power distribution network, and can effectively enhance the operation elasticity and fault recovery capability of the power distribution network. And the construction and development of a novel power system are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network fault recovery, and particularly to a multi-resource distributed collaborative control method for an AC-DC hybrid distribution network. Background Art

[0002] Extreme natural disasters such as typhoons, earthquakes, and hailstorms often cause the distribution network to disconnect from the upstream large power grid, resulting in large-scale power outages, which pose a huge threat to the promotion and stable operation of the new power system. When the distribution network is in a power-off state after a disaster, internal recovery resources such as energy storage, photovoltaic, wind power, and new interconnection devices can be used to form multiple microgrids operating in isolation. The electrical boundaries of the microgrids can also change dynamically according to the issued reconstruction instructions to form a scalable and expandable dynamic recovery area (DRA), so as to respond to the flexible reorganization process of the distribution network fault recovery and improve the reliability and response ability of the distribution network under extreme events.

[0003] With the proposal of China's "dual carbon" goal and the continuous promotion of the construction of the new power system, the access of high-proportion distributed energy and high-proportion power electronic devices has become inevitable, and it promotes the development and construction of China's distribution network as an important force in the energy structure transformation. The application technologies of DC loads such as electric vehicle charging piles and DC parks, as well as DC power sources such as energy storage, photovoltaic, and wind power, are constantly developing. Compared with the traditional method of accessing the AC distribution network through an AC-DC converter, directly accessing the DC distribution network has smaller losses and higher energy utilization efficiency. Its access demand is increasing day by day, and a certain scale of DC distribution network will be formed. Therefore, the evolution of the traditional AC distribution network to an AC-DC hybrid distribution network is one of the important directions for the development and construction of the future new power system. It is necessary to study the distributed collaborative control method of multi-resources during the fault recovery process of the AC-DC hybrid distribution network.

[0004] During the fault recovery process of the distribution network, due to the limited capacity of the recovery resources and to prevent cascading faults from affecting the stable recovery of the distribution network, the distribution network will first be divided into multiple independent island partitions that are powered stably through the internal recovery resources. Then, the topological structure of the distribution network will change dynamically according to the optimized reconstruction strategy, and multiple island partitions will merge or separate from each other. Finally, multiple island partitions operate synchronously and merge into a stable operating recovery area. At this time, it is necessary to reconnect seamlessly with the large power grid. Therefore, the collaborative control of multi-resources during the post-disaster recovery process of the distribution network should be a multi-stage action process. However, existing research lacks a clear understanding of the multi-stage action process of fault recovery from the perspective of the collaborative control of multi-resources. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-resource distributed collaborative control method for an AC-DC hybrid distribution network. The present invention can effectively enhance the operation flexibility and fault recovery ability of the distribution network.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A multi-resource distributed collaborative control method for an AC-DC hybrid distribution network according to the present invention includes:

[0008] Step 1: Clarify the dynamic microgrid multi-region operation framework of the post-disaster AC-DC hybrid distribution network. In the dynamic microgrid multi-region operation framework, the AC-DC hybrid distribution network is divided into multiple independently operating island partitions according to the spatial distribution and control characteristics of the restoration resources. Dynamic collaboration of resources is achieved between multiple island partitions through interconnected intelligent switches SSW or connection converters CC;

[0009] Step 2: Define the multi-stage action process of fault recovery from the perspective of the collaborative control of multiple inverters. The multi-stage action process includes the action process of the first stage, the action process of the second stage, and the action process of the third stage. Among them,

[0010] The action process of the first stage is:

[0011] Establish the voltage and frequency of multiple island partitions, and each island partition is re-powered through the restoration resources inside the island partition; among them, the restoration resources include network-forming resources, grid-following resources, and CC;

[0012] The action process of the second stage is:

[0013] Adjust the dynamic electrical boundary of the island partition, and adjust the state of the SSW for the specified action, so as to achieve the merger or separation of the island partitions;

[0014] The action process of the third stage is:

[0015] Adjust the state of the grid-connected switch to achieve the connection between the distribution network and the large power grid;

[0016] Step 3: In the action process of the first stage, design a distributed controller for the restoration resources in the distribution network according to the collaborative control target;

[0017] Step 4: In the action process of the second stage, design a distributed controller for different types of restoration resources according to the collaborative control target of the SSW state adjustment;

[0018] Step 5: In the action process of the third stage, design a distributed controller for different types of restoration resources according to the collaborative control target of the grid-connected switch state adjustment.

[0019] As a further optimization scheme of a multi - resource distributed collaborative control method for an AC - DC hybrid distribution network shown in the present invention, in step 3, during the operation of the first stage, the collaborative control objective is to ensure the stable operation of each island partition;

[0020] In step 4, during the operation of the second stage, the collaborative control objective of the SSW state regulation is: when the voltage phase and amplitude difference at both ends of the SSW are close to 0, close the SSW; when the active and reactive powers flowing through the SSW are close to 0, disconnect the SSW;

[0021] In step 5, during the operation of the third stage, the collaborative control objective of the grid - connected switch state regulation is: when the voltage phase and amplitude difference at both ends of the grid - connected switch are close to 0, close the grid - connected switch; when the active and reactive powers flowing through the grid - connected switch are close to 0, disconnect the grid - connected switch.

[0022] As a further optimization scheme of a multi - resource distributed collaborative control method for an AC - DC hybrid distribution network shown in the present invention, establishing the voltage and frequency of multiple island partitions includes: after a completely power - off distribution system is divided into multiple independently operating island partitions, each island partition restores the power - off load through the internal GFMS black - start. If there is GFLS, it is driven to start by GFMS, and the two operate collaboratively to restore the load.

[0023] As a further optimization scheme of a multi - resource distributed collaborative control method for an AC - DC hybrid distribution network shown in the present invention, in step 2, the multi - stage operation process includes:

[0024] The network - forming resources in the DC subnet adopt primary droop control to support the grid voltage and additional distributed secondary control to achieve the collaborative control objectives in each stage; specifically as follows:

[0025]

[0026] Among them, V i,dc represents the operating voltage of the i - th DG in the DC subnet; represents the reference value of the operating voltage of the i - th DG in the DC subnet; m i,dc represents the active - voltage droop coefficient of the i - th DG in the DC subnet; P i,dc represents the active power output by the i - th DG in the DC subnet; Δu i,dc represents the total secondary control variable of the distributed controller of the i - th DG in the DC subnet as a network - forming resource;

[0027] The grid - following resources in the DC subnet adopt primary inverted droop control to operate collaboratively with the network - forming resources, and at the same time additional distributed secondary control is adopted to achieve the collaborative control objectives in each stage, specifically as follows:

[0028]

[0029] Among them, w i,dc represents the active-voltage droop coefficient of the i-th DG in the DC sub-network; Δp i,dc represents the total secondary control variable of the distributed controller of the i-th DG in the DC sub-network as a grid-following resource;

[0030] In the AC-DC hybrid distribution network, dynamic coordination of resources is achieved between multiple island partitions through the connection converter CC. CC is responsible for regulating the coordinated operation of different types of resources in the AC sub-network and the DC sub-network, and controlling the reactive power output of CC to be 0; specifically as follows:

[0031]

[0032] Among them, ω cc and respectively represent the actual value and the reference value of the operating frequency of CC participating in the coordinated operation of the AC power grid; V cc and respectively represent the actual value and the reference value of the operating voltage of CC participating in the coordinated operation of the DC power grid; λ cc and η cc respectively represent the active-frequency droop coefficient of CC participating in the coordinated operation of the AC power grid and the active-voltage droop coefficient of CC participating in the coordinated operation of the DC power grid; P cc represents the active power output by CC; represents whether CC participates in the coordinated operation of the AC power grid. If it participates, the value is 1, otherwise it is 0; Δp cc represents the total secondary control variable of the distributed controller of CC.

[0033] As a further optimization scheme of a multi-resource distributed coordinated control method for an AC-DC hybrid distribution network shown in the present invention, step 3 includes:

[0034] The grid-forming resources in the DC sub-network should ensure the stable operation of the island partition. The variable Δu of the distributed controller in the first stage of the grid-forming resources S,dc is designed as:

[0035]

[0036] Among them, ΔV i,dc represents the deviation between the operating voltage of the i-th DG in the DC sub-network and the reference value; ΔP′ ij,dc = P′ i,dc - P′ j,dc , ΔP′ ij,dc represents the deviation of the unit active power output between the i-th DG and the j-th DG in the DC sub-network; c fd 、c pdrespectively represent ΔV i,dc and ΔP i ′ j,dc corresponding gains; d ij indicates whether there is a communication link between the i-th DG and the j-th DG in the DC subnet. If there is, the value is 1; otherwise, it is 0; α i,dc indicates whether the i-th DG in the DC subnet enables voltage regulation, P′ i,dc represents the unit active power output by the i-th DG in the DC subnet, P′ j,dc represents the unit active power output by the j-th DG in the DC subnet;

[0037] The variable Δp of the distributed controller in the first stage of the grid-following resources in the DC subnet S,dc is designed as:

[0038]

[0039] where, c fgd 、c pgd respectively represent the gains corresponding to the various variables to be adjusted in the design; ΔP ij,dc =P i,dc -P j,dc represents the active power deviation between the i-th DG and the j-th DG in the DC subnet, E rate is the rated capacity of the DG, P j,dc is the active power output by the j-th DG in the DC subnet;

[0040] The variable Δp of the distributed controller in the first stage of CC S,cc is designed as follows:

[0041]

[0042] where, Δω cc 、ΔV cc respectively represent the deviation between the frequency at which CC participates in the coordinated operation of the AC subnet and the voltage at which it participates in the coordinated operation of the DC subnet and the corresponding reference values; b ij indicates whether there is a communication link between the i-th DG and the j-th DG in the island partition of the AC subnet interconnected by CC and the island partition of the DC subnet. If there is, the value is 1; otherwise, it is 0; ΔP ij,cc =P i,cc -P j,cc ,ΔP ij,cc represents the active power deviation between the i-th DG and the j-th DG in the island partition of the AC subnet interconnected by CC and the island partition of the DC subnet; c fcc 、c pcc 、c fdcc 、c pdccrespectively represent the gains corresponding to each variable to be adjusted in the design; α cc indicates whether CC enables voltage regulation, P i,cc represents the active power output of the i-th DG in the AC subnet islanding partition and the DC subnet islanding partition interconnected by CC, P j,cc represents the active power output of the j-th DG in the AC subnet islanding partition and the DC subnet islanding partition interconnected by CC.

[0043] As a further optimization scheme of a multi-resource distributed collaborative control method for an AC-DC hybrid distribution network shown in the present invention, step 4 includes:

[0044] Adjust the state of the SSW, and the variable Δu of the distributed controller in the second stage of the network-forming resources in the DC subnet T,dc is designed as follows:

[0045] Δu T,dc = c td β i,dc ΔV SSWd,k + c spd γ i,dc ΔP S ′ SWd,k (7)

[0046] where, ΔV SSWd,k represents the voltage amplitude deviation across the k-th SSW in the DC subnet; ΔP SSWd,k represents the unit active power flowing through the k-th SSW in the DC subnet; β i,dc and γ i,dc respectively indicate whether the i-th DG in the DC subnet participates in adjusting the state of the SSW to meet the closing or opening condition. When the SSW changes from open to closed, β i,dc = 1, γ i,dc = 0. When the SSW changes from closed to open, β i,dc = 0, γ i,dc = 1. When the SSW does not operate, β i,dc = 0, γ i,dc = 0; c td 、c spd respectively represent the gains corresponding to each variable to be adjusted in the design;

[0047] Adjust the state of the SSW, and the variable Δp of the distributed control in the second stage of the network-following resources in the DC subnet T,dc is designed as follows:

[0048] Δp T,dc = c tdg β i,dc ΔV SSWd,k + c spdg γ i,dcΔP SSWd,k (8)

[0049] Among them, c tdg and c spdg respectively represent the gains corresponding to each variable to be adjusted in the design; ΔP SSWd,k represents the active power flowing through the k-th SSW in the DC subnet, and ΔV SSWd,k is the voltage amplitude deviation across the k-th SSW in the DC subnet;

[0050] For adjusting the state of the SSW, the variable Δp of the distributed controller in the second stage of the CC is designed as follows: T,cc Design is as follows:

[0051]

[0052] Among them, β cc and γ cc respectively represent whether CC participates in adjusting the state of the SSW to meet the closing or opening conditions when participating in the coordinated operation of the AC subnet. When the SSW changes from open to closed, β cc = 1, γ cc = 0. When the SSW changes from closed to open, β cc = 0, γ cc = 1. When the SSW does not operate, β cc = 0, γ cc = 0; β dcc and γ dcc respectively represent whether CC participates in adjusting the state of the SSW to meet the closing or opening conditions when participating in the coordinated operation of the DC subnet. When the SSW changes from open to closed, β dcc = 1, γ dcc = 0. When the SSW changes from closed to open, β dcc = 0, γ dcc = 1. When the SSW does not operate, β dcc = 0, γ dcc = 0; c tcc 、c spcc 、c tdcc 、c spdcc respectively represent the gains corresponding to each variable to be adjusted in the design; Δθ SSWa,k represents the voltage phase deviation across the k-th SSW in the AC subnet, and ΔP SSWa,k represents the active power flowing through the k-th SSW in the AC subnet.

[0053] As a further optimization scheme of the multi-resource distributed cooperative control method for the AC-DC hybrid distribution network shown in the present invention, step 5 includes:

[0054] Adjust the state of the grid-connected switch, and the variable Δu of the distributed controller in the third stage of the grid-forming resources in the DC subnetwork R,dc is designed as follows:

[0055] Δu R,dc = c θd λ i,dc ΔV DC (10)

[0056] where ΔV DC represents the voltage amplitude deviation across the grid-connected switch connected to the DC subnetwork; λ i,dc represents whether the i-th DG in the DC subnetwork needs to participate in adjusting the state of the grid-connected switch to meet the closing condition. When the grid connection command is issued, λ i,dc = 1, otherwise λ i,dc = 0; c θd represents the gain corresponding to each variable that needs to be adjusted in the design;

[0057] Adjust the state of the grid-connected switch, and the variable Δp of the distributed controller in the third stage of the grid-following resources in the DC subnetwork R,dc is designed as follows:

[0058] Δp R,dc = c θgd λ i,dc ΔV DC (11)

[0059] where c θgd represents the gain corresponding to each variable that needs to be adjusted in the design;

[0060] Adjust the state of the grid-connected switch, and the variable Δp of the distributed controller in the third stage of the CC R,cc is designed as follows:

[0061]

[0062] where λ cc represents whether the CC needs to participate in adjusting the state of the grid-connected switch to meet the closing condition when participating in the coordinated operation of the AC subnetwork. When the grid connection command is issued, λ cc = 1, otherwise λ cc = 0; λ dcc represents whether the CC needs to participate in adjusting the state of the grid-connected switch to meet the closing condition when participating in the coordinated operation of the DC subnetwork. When the grid connection command is issued, λ dcc = 1, otherwise λ dcc = 0; c θcc 、c zcc 、c θdcc respectively represent the gain corresponding to each variable that needs to be adjusted in the design; Δθ Cis the voltage phase deviation across the grid-connection switch of the AC subnet, ΔV AC is the voltage amplitude deviation across the grid-connection switch of the AC subnet.

[0063] As a further optimization scheme of the multi-resource distributed collaborative control method for AC-DC hybrid distribution networks shown in the present invention,

[0064]

[0065] A computer device includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, the steps of the above-mentioned multi-resource distributed collaborative control method for AC-DC hybrid distribution networks are implemented.

[0066] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the above-mentioned multi-resource distributed collaborative control method for AC-DC hybrid distribution networks are implemented.

[0067] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

[0068] (1) The present invention solves the problem that the cooperative control technology of multiple inverters under traditional fault recovery does not consider the cooperative control of multi-regional and multi-resource in AC-DC distribution networks and the multi-stage action process of fault recovery, providing technical support for the multi-stage dynamic cooperative recovery of AC-DC distribution networks after disasters.

[0069] (2) The present invention can not only divide the post-disaster distribution network into multiple independently operating island partitions according to the spatial distribution and control characteristics of distributed resources, and the electrical boundaries of the partitions can change dynamically, but also clarify the multi-stage action process of fault recovery of the post-disaster distribution network from the perspective of cooperative control of multiple inverters, ensuring the smooth progress of the recovery process. This method can effectively enhance the operation flexibility and fault recovery ability of the distribution network and promote the construction and development of new power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 is the flowchart of the method of the present invention;

[0071] Figure 2 is the multi-region operation framework diagram of the dynamic microgrid of the present invention;

[0072] Figure 3 is the multi-stage action strategy diagram of fault recovery of the present invention;

[0073] Figure 4 is the experimental result obtained by using the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0074] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] As Figure 1 shown, a multi - resource distributed collaborative control method for an AC - DC hybrid distribution network considering multiple regions and multiple stages of the present invention includes the following steps:

[0076] 1) Clarify the dynamic micro - grid multi - region operation framework of the post - disaster AC - DC hybrid distribution network. In the dynamic micro - grid multi - region operation framework, divide the AC - DC hybrid distribution network into multiple independently operating island partitions according to the spatial distribution and control characteristics of the restoration resources. Resources between multiple island partitions achieve dynamic collaboration through interconnected intelligent switches SSW or connection converters CC.

[0077] As Figure 2 shown, in the proposed dynamic micro - grid multi - region operation framework of the post - disaster AC - DC hybrid distribution network, the AC subnet and the DC subnet are respectively divided into multiple independently operating island partitions through SSW, and the AC subnet and the DC subnet are connected through CC. In the divided island partitions, each partition needs to include at least one GFMS to support the voltage and frequency of the partition, and there may be GFLS participating in collaborative operation to restore more lost power loads. Multiple island partitions can operate independently or collaborate with adjacent regions through interconnected SSW or CC. At the same time, the electrical boundary of each island partition can change dynamically to respond to reconstruction instructions issued based on various system operation constraints such as the uncertainty of distributed resource output, load uncertainty, etc., and various optimization objectives such as minimum cost, maximum load restoration, etc., so as to optimize and adjust the operation topology of the system to meet various required operation objectives. The above - mentioned dynamic micro - grid multi - region operation framework supports scalable distributed control strategies specific to regional stable operation and the collaborative operation of restoration resources between the AC subnet and the DC subnet, thereby enhancing the operation resilience and fault recovery ability of the distribution network.

[0078] 2) Define the multi - stage action process of fault recovery from the perspective of the collaborative control of multiple inverters. The multi - stage action process includes the action process of the first stage, the action process of the second stage, and the action process of the third stage. Among them, the action process of the first stage is: establish the voltage and frequency of multiple island partitions, and each island partition is re - powered through the restoration resources inside the island partition; among them, the restoration resources include network - forming resources, grid - following resources, and CC; the action process of the second stage is: adjust the dynamic electrical boundary of the island partition and adjust the state of the SSW for the specified action, so as to achieve the merger or separation of the island partitions; the action process of the third stage is: adjust the state of the grid - connection switch to achieve the connection between the distribution network and the large grid.

[0079] AsFigure 3 As shown in Stage 1 in Figure 3 , during the fault recovery process of the distribution network, the distribution network is first divided into multiple independently operating island partitions, and the partitions are stably powered through internal recovery resources. As Figure 3 shown in Stage 2 in

[0080] Figure 3 , then the topological structure of the distribution network will change dynamically according to the optimized reconstruction strategy, and multiple island partitions will merge or separate from each other. As

[0081] Figure 3 shown in Stage 3 in

[0082] Figure 3 , finally, multiple island partitions operate synchronously and merge into a stable operating recovery area. At this time, it is necessary to reconnect seamlessly with the large power grid. Therefore, based on the operating concept of dynamic electrical boundaries, a multi-stage action process for fault recovery of the post-disaster distribution network is proposed from the perspective of coordinated control of multiple inverters, including the establishment of voltage and frequency in multiple island partitions, the adjustment of dynamic electrical boundaries of island partitions, and the seamless grid connection of the distribution network, so as to ensure the stable operation of the distribution network during the fault recovery process.

[0083] Figure 3 Stage 1, Stage 2, and Stage 3 in

[0084] 3) During the operation of the first stage, a distributed controller for the restoration resources in the distribution network is designed according to the coordinated control objective; where the coordinated control objective is to ensure the stable operation of each island partition.

[0085] The network-forming resources in the AC subnet have the ability to independently support the grid voltage and frequency. Usually, droop control is used to regulate the voltage and frequency in the microgrid, and distributed secondary control is added to achieve the coordinated control objectives at different stages. The overall control strategy is designed as follows:

[0086]

[0087] Among them, ω i,ac and V i,ac respectively represent the operating frequency and voltage of the i-th DG in the AC subnet; and respectively represent the reference values of the operating frequency and voltage of the i-th DG in the AC subnet; m i,ac and n i,ac respectively represent the active-frequency and reactive-voltage droop coefficients of the i-th DG in the AC subnet; P i,ac and Q i,ac respectively represent the active and reactive powers output by the i-th DG in the AC subnet; Δu i,ac and Δv i,ac represent the distributed secondary controller variables of the i-th network-forming resource in the AC subnet.

[0088] The grid-following resources in the AC subnet do not have the ability to independently support the grid voltage and frequency. Usually, primary inverted droop control is used to operate in coordination with the network-forming resources, and distributed secondary control is also added to achieve the coordinated control objectives at different stages. The overall control strategy is designed as follows:

[0089]

[0090] Among them, w i,ac and h i,ac respectively represent the active-frequency and reactive-voltage inverted droop coefficients of the i-th DG in the AC subnet; Δp i,ac and Δq i,ac represent the distributed secondary controller variables of the i-th grid-following resource in the AC subnet.

[0091] The network-forming resources in the DC subnet use primary droop control to support the grid voltage, and distributed secondary control is added to achieve the coordinated control objectives at each stage, as follows:

[0092]

[0093] Among them, V i,dc represents the operating voltage of the i-th DG in the DC subnet; represents the reference value of the operating voltage of the \(i\)-th DG in the DC subnet; \(m\) i,dc represents the active-power - voltage droop coefficient of the \(i\)-th DG in the DC subnet; \(P\) i,dc represents the active power output by the \(i\)-th DG in the DC subnet; \(\Delta u\) i,dc represents the total secondary control variable of the distributed controller of the \(i\)-th DG in the DC subnet as a network-forming resource.

[0094] The grid-following resources in the DC subnet adopt primary inverted droop control to operate in coordination with the network-forming resources, and at the same time, additional distributed secondary control is added to achieve the coordinated control objectives in each stage, as follows:

[0095]

[0096] where, \(w\) i,dc represents the active-power - voltage inverted droop coefficient of the \(i\)-th DG in the DC subnet; \(\Delta p\) i,dc represents the total secondary control variable of the distributed controller of the \(i\)-th DG in the DC subnet as a grid-following resource.

[0097] In the AC-DC hybrid distribution network, the CC is responsible for regulating the coordinated operation of different types of resources in the AC subnet and the DC subnet. Considering that the CC can interact with the AC subnet and at the same time participate in the coordinated operation of the DC subnet, the active power output control strategy of the CC is designed to achieve the mutual coupling with the two networks. At the same time, in order to simplify the communication structure and prevent the generation of reactive power circulation, the reactive power output of the CC is controlled to be 0. The overall control strategy is designed as follows:

[0098]

[0099] where, \(\omega\) cc and respectively represent the actual value and the reference value of the operating frequency of the CC participating in the coordinated operation of the AC power grid; \(V\) cc and respectively represent the actual value and the reference value of the operating voltage of the CC participating in the coordinated operation of the DC power grid; \(\lambda\) cc and \(\eta\) cc respectively represent the active-power - frequency droop coefficient of the CC participating in the coordinated operation of the AC power grid and the active-power - voltage droop coefficient of the CC participating in the coordinated operation of the DC power grid; \(P\) cc represents the active power output by the CC; represents whether the CC participates in the coordinated operation of the AC power grid. If it participates, the value is 1, otherwise it is 0; \(\Delta p\) cc represents the total secondary control variable of the distributed controller of the CC.

[0100] To ensure the stable operation of each island partition and achieve the undifferentiated recovery of the AC subnet voltage / frequency and power sharing, the variables Δu of the grid-forming resource distributed controller in the first stage S,ac and Δv S,ac are designed as follows:

[0101]

[0102] Among them, and respectively represent the deviations of the operating frequency and voltage of the i-th DG in the AC subnet from the reference values; a ij indicates whether there is a communication link between the i-th DG and the j-th DG in the AC subnet. If there is, the value is 1; otherwise, it is 0; ΔP′ ij,ac =P′ i,ac -P′ j,ac and ΔQ′ ij,ac =Q′ i,ac -Q′ j,ac respectively represent the deviations of the active and reactive power outputs per unit of the i-th DG and the j-th DG in the AC subnet; c f 、c p 、c v 、c q respectively represent the corresponding secondary controller variable gains; α i,ac indicates whether the voltage regulation of the i-th DG in the AC subnet is enabled.

[0103] To ensure the coordinated and stable operation of the grid-following resources and grid-forming resources in the AC subnet, the variables Δp S,ac and Δq S,ac of the distributed controller of the grid-following resources in the first stage are designed as follows:

[0104]

[0105] Among them, c fg 、c pg 、c vg 、c qg respectively represent the corresponding secondary controller variable gains; E rate represents the rated capacity value of the inverter; ΔP ij,ac =P i,ac -P j,ac and ΔQ ij,ac =Q i,ac -Q j,ac respectively represent the deviations of the active and reactive power outputs of the i-th DG and the j-th DG in the AC subnet.

[0106] The grid-forming resources in the DC subnet need to ensure the stable operation of the island partition. The variable Δu of the distributed controller of the grid-forming resources in the first stage S,dc is designed as follows:

[0107]

[0108] Among them, ΔV i,dc represents the deviation between the operating voltage of the i-th DG in the DC subnet and the reference value; ΔP′ ij,dc = P′ i,dc - P′ j,dc ΔP′ ij,dc represents the deviation of the unit active power output between the i-th DG and the j-th DG in the DC subnet; c fd and c pd respectively represent the gains corresponding to ΔV i,dc and ΔP′ ij,dc ; d ij represents whether there is a communication link between the i-th DG and the j-th DG in the DC subnet. If there is, the value is 1; otherwise, it is 0; α i,dc represents whether the i-th DG in the DC subnet enables voltage regulation, P′ i,dc represents the unit active power output of the i-th DG in the DC subnet, and P′ j,dc represents the unit active power output of the j-th DG in the DC subnet.

[0109] The variable Δp of the distributed controller in the first stage of the grid-following resources in the DC subnet S,dc is designed as:

[0110]

[0111] Among them, c fgd and c pgd respectively represent the gains corresponding to each variable to be adjusted in the design; ΔP ij,dc = P i,dc - P j,dc represents the active power deviation between the i-th DG and the j-th DG in the DC subnet, E rate is the rated capacity of the DG, and P j,dc is the active power output of the j-th DG in the DC subnet.

[0112] To ensure the stable operation of the AC-DC hybrid distribution network and establish stable voltage and frequency in each island partition of the AC subnet and the DC subnet, the variable Δp of the distributed controller in the first stage of the CC S,cc is designed as follows:

[0113]

[0114] Among them, Δω cc and ΔV ccrespectively represent the frequency of the CC participating in the coordinated operation of the AC subnet and the deviation of the voltage participating in the coordinated operation of the DC subnet from the corresponding reference value; b ij indicates whether there is a communication link between the i-th DG and the j-th DG in the island partition of the AC subnet interconnected by the CC and the island partition of the DC subnet. If there is, the value is 1; otherwise, it is 0; ΔP ij,cc =P i,cc -P j,cc ,ΔP ij,cc represents the deviation of the active power output of the i-th DG and the j-th DG in the island partition of the AC subnet interconnected by the CC and the island partition of the DC subnet; c fcc 、c pcc 、c fdcc 、c pdcc respectively represent the gains corresponding to each variable to be adjusted in the design; α cc indicates whether the CC enables voltage regulation, P i,cc represents the active power output of the i-th DG in the island partition of the AC subnet interconnected by the CC and the island partition of the DC subnet, P j,cc represents the active power output of the j-th DG in the island partition of the AC subnet interconnected by the CC and the island partition of the DC subnet.

[0115] As Figure 4 shown from 0 to 5 s in, each island partition of the AC and DC subnets establishes its own voltage and frequency through the internal DG, and the DGs in each island partition achieve equal power sharing. It should be noted that the DGs in the DC subnet do not output reactive power, and the SOP controls the output reactive power to be 0 when interacting with the AC subnet.

[0116] 4) During the operation of the second stage, the coordinated control objective of the SSW state regulation is: close the SSW when the voltage phase and amplitude difference at both ends of the SSW are close to 0, and open the SSW when the active and reactive powers flowing through the SSW are close to 0; design distributed controllers for different types of restoration resources according to the coordinated control objective of the SSW state regulation.

[0117] For the regulation of the SSW state, the secondary control variables Δu T,ac and Δv T,ac of the network-forming resources in the AC subnet are designed as follows:

[0118]

[0119] where, Δθ SSWa,k and ΔV SSWa,k respectively represent the voltage phase and amplitude deviation at both ends of the k-th SSW in the AC subnet; ΔP′ SSWa,k and ΔQ SSWa,k respectively represent the unit active and reactive powers flowing through the k-th SSW in the AC subnet; βi,ac and γ i,ac respectively represent whether the i-th DG in the AC subnet participates in regulating the SSW state to meet the closing or opening condition. When it is required that the SSW changes from open to closed, β i,ac = 1, γ i,ac = 0. When it is required that the SSW changes from closed to open, β i,ac = 0, γ i,ac = 1. When the SSW does not act, β i,ac = 0, γ i,ac = 0; c t 、c sp 、c o 、c sq respectively represent the corresponding secondary controller variable gains.

[0120] For regulating the state of the SSW, the secondary control variables Δp T,ac and Δq T,ac of the grid-following resources in the second stage of the AC subnet are designed as follows:

[0121]

[0122] Among them, c tg 、c spg 、c og 、c sqg respectively represent the corresponding secondary controller variable gains; ΔP SSWa,k and ΔQ SSWa,k respectively represent the active and reactive powers flowing through the k-th SSW in the AC subnet.

[0123] For regulating the state of the SSW, the variable Δu T,dc of the distributed controller in the second stage of the grid-forming resources in the DC subnet is designed as follows:

[0124] Δu T,dc = c td β i,dc ΔV SSWd,k + c spd γ i,dc ΔP S ′ SWd,k (13)

[0125] Among them, ΔV SSWd,k represents the voltage amplitude deviation across the k-th SSW in the DC subnet; ΔP′ SSWd,k represents the unit active power flowing through the k-th SSW in the DC subnet; β i,dc and γ i,dc respectively represent whether the i-th DG in the DC subnet participates in regulating the SSW state to meet the closing or opening condition. When the SSW changes from open to closed, β i,dc= 1, γ i,dc = 0, when SSW changes from closed to open, β i,dc = 0, γ i,dc = 1, when SSW is not operating, β i,dc = 0, γ i,dc = 0; c td and c spd respectively represent the gains corresponding to the respective variables to be adjusted in the design.

[0126] Adjust according to the state of SSW. The variable Δp of the second-stage distributed control of the grid-following resources in the DC subnet T,dc is designed as follows:

[0127] Δp T,dc = c tdg β i,dc ΔV SSWd,k + c spdg γ i,dc ΔP SSWd,k (14)

[0128] where c tdg and c spdg respectively represent the gains corresponding to the respective variables to be adjusted in the design; ΔP SSWd,k represents the active power flowing through the k-th SSW in the DC subnet, and ΔV SSWd,k is the voltage amplitude deviation across the k-th SSW in the DC subnet.

[0129] Adjust according to the state of SSW. The variable Δp of the second-stage distributed controller of CC T,cc is designed as follows:

[0130]

[0131] where β cc and γ cc respectively represent whether CC participates in adjusting the state of SSW to meet the closing or opening conditions when participating in the coordinated operation of the AC subnet. When SSW changes from open to closed, β cc = 1, γ cc = 0, when SSW changes from closed to open, β cc = 0, γ cc = 1, when SSW is not operating, β cc = 0, γ cc = 0; β dcc and γ dcc respectively represent whether CC participates in adjusting the state of SSW to meet the closing or opening conditions when participating in the coordinated operation of the DC subnet. When SSW changes from open to closed, β dcc = 1, γ dcc= 0. When SSW changes from closed to open, β dcc = 0, γ dcc = 1. When SSW does not operate, β dcc = 0, γ dcc = 0; c tcc and c spcc and c tdcc and c spdcc respectively represent the gains corresponding to the various variables to be adjusted in the design; Δθ SSWa,k represents the voltage phase deviation across the k-th SSW in the AC sub-network, and ΔP SSWa,k represents the active power flowing through the k-th SSW in the AC sub-network.

[0132] As Figure 4 shown in 5 - 25 s, during the dynamic reconfiguration of the distribution network topology, the merging or separation of DRAs is achieved through the seamless closing or opening of SSWs. As reflected in the figure, all DGs within the merged DRA achieve power sharing, and all DGs within each separated DRA achieve power sharing. The output power of the SOP also changes accordingly, and the control modes for interacting with the DC sub-network and the AC sub-network achieve smooth conversion.

[0133] 5) During the operation in the third stage, the cooperative control objective for adjusting the grid-connected switch state is: the voltage phase and amplitude difference across the grid-connected switch approach 0 and the grid-connected switch closes; the active and reactive power flowing through the grid-connected switch approach 0 and the grid-connected switch opens; design distributed controllers for different types of restoration resources according to the cooperative control objective for adjusting the grid-connected switch state.

[0134] Adjust the state of the grid-connected switch. The secondary control variables Δu R,ac and Δv R,ac of the network-forming resources in the AC sub-network in the third stage are designed as follows:

[0135]

[0136] Among them, Δθ C and ΔV AC respectively represent the voltage phase and amplitude deviations across the grid-connected switch connected to the AC sub-network; λ i,ac represents whether the i-th DG in the AC sub-network needs to participate in adjusting the state of the grid-connected switch to meet the closing condition. When a grid-connection command is issued, λ i,ac = 1, otherwise λ i,ac = 0; c θ and c z respectively represent the gains of the corresponding secondary controller variables.

[0137] Adjust the state of the grid-connected switch, and the secondary control variables Δp in the third stage of the grid-following resources in the AC subnet R,ac and Δq R,ac are designed as follows:

[0138]

[0139] where c θg and c zg respectively represent the corresponding secondary controller variable gains.

[0140] Adjust the state of the grid-connected switch, and the variable Δu of the distributed controller in the third stage of the grid-forming resources in the DC subnet R,dc is designed as follows:

[0141] Δu R,dc = c θd λ i,dc ΔV DC (18)

[0142] where ΔV DC represents the voltage amplitude deviation at both ends of the grid-connected switch connected to the DC subnet; λ i,dc indicates whether the i-th DG in the DC subnet needs to participate in adjusting the state of the grid-connected switch to meet the closing condition. When the grid connection instruction is issued, λ i,dc = 1, otherwise λ i,dc = 0; c θd represents the gain corresponding to each variable that needs to be adjusted in the design.

[0143] Adjust the state of the grid-connected switch, and the variable Δp of the distributed controller in the third stage of the grid-following resources in the DC subnet R,dc is designed as follows:

[0144] Δp R,dc = c θgd λ i,dc ΔV DC (19)

[0145] where c θgd represents the gain corresponding to each variable that needs to be adjusted in the design.

[0146] Adjust the state of the grid-connected switch, and the variable Δp of the distributed controller in the third stage of CC R,cc is designed as follows:

[0147]

[0148] where λ cc indicates whether CC needs to participate in adjusting the state of the grid-connected switch to meet the closing condition when participating in the coordinated operation of the AC subnet. When the grid connection instruction is issued, λcc = 1, otherwise λ cc = 0; λ dcc Indicates whether CC needs to participate in regulating the grid - connection switch state to meet the closing condition when participating in the coordinated operation of the DC subnet. When the grid - connection command is issued, λ dcc = 1, otherwise λ dcc = 0; c θcc 、c zcc 、c θdcc respectively represent the gains corresponding to each variable to be adjusted in the design; Δθ C is the voltage phase deviation across the grid - connection switch of the AC subnet, ΔV AC is the voltage amplitude deviation across the grid - connection switch of the AC subnet.

[0149] As Figure 4 shown in 25 - 30s of, after the power supply of the distribution network is restored, the state of the grid - connection switch is adjusted, which is reflected in the figure as a corresponding change in the output power of the DG.

[0150] According to the multi - stage action process of fault recovery proposed in step 2), the secondary control variables designed for different action stages are summed up to jointly form the total secondary control variables corresponding to different types of resources, that is:

[0151]

[0152] As described above, only the specific embodiments of the present invention are given, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A multi-resource distributed collaborative control method for an AC / DC hybrid distribution network, characterized in that: include: Step 1: Clarify the dynamic microgrid multi-regional operation framework of the post-disaster AC / DC hybrid distribution network. In the dynamic microgrid multi-regional operation framework, the AC / DC hybrid distribution network is divided into multiple independently operated island partitions according to the spatial distribution and control characteristics of the recovery resources. The multiple island partitions realize dynamic coordination of resources through interconnected smart switches SSW or connected converters CC; Step 2: Define a multi-stage action process for fault recovery from the perspective of coordinated control of multiple inverters. The multi-stage action process includes a first stage action process, a second stage action process, and a third stage action process, wherein: The first stage of the process is: Establish multi-island partition voltage and frequency, and each island partition is re-powered through the internal recovery resources of the island partition; the recovery resources include network-building resources, network-following resources, and CC; The second stage of the process is: Adjust the dynamic electrical boundaries of the island partitions and adjust the state of the SSW of the specified action to achieve the merging or separation of the island partitions; The action process of the third stage is: Adjust the state of the grid-connected switch to connect the distribution network to the large power grid; Step 3: During the first phase of the operation, a distributed controller of the restoration resources in the distribution network is designed according to the collaborative control target; Step 4: During the second phase of the action, design distributed controllers for different types of recovery resources according to the collaborative control objectives of the SSW state adjustment; Step 5: During the third phase, distributed controllers of different types of recovery resources are designed according to the coordinated control objectives of grid-connected switch state regulation.

2. A method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 1, characterized in that: In step 3, during the first phase of the action, the coordinated control goal is to ensure the stable operation of each island partition; In step 4, during the second stage of operation, the coordinated control goal of the SSW state regulation is: when the voltage phase and amplitude difference at both ends of the SSW is close to 0, close the SSW, and when the active and reactive power flowing through the SSW is close to 0, open the SSW; In step 5, during the third stage of operation, the coordinated control target of the grid-connected switch state regulation is: the voltage phase and amplitude difference at both ends of the grid-connected switch is close to 0, and the grid-connected switch is closed; The active and reactive power flowing through the grid-connected switch is close to 0, and the grid-connected switch is disconnected.

3. The method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 1, characterized in that: Establishing multi-island partition voltage and frequency includes: after a completely power-off distribution system is divided into multiple independently operated island partitions, each island partition restores the power-off load through the internal GFMS black start. If GFLS exists, it is started through GFMS, and the two work together to restore the load.

4. The method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 1, characterized in that: In step 2, the multi-stage action process includes: The grid-forming resources in the DC subgrid use primary droop control to support the grid voltage, and additional distributed secondary control to achieve the coordinated control objectives of each stage; the details are as follows: Among them, V i,dc represents the operating voltage of the ith DG in the DC subnet; represents the operating voltage reference value of the ith DG in the DC subnet; m i,dc P represents the active power-voltage droop coefficient of the ith DG in the DC subnet; i,dc represents the active power output by the i-th DG in the DC subnet; Δu i,dc represents the total secondary control variable of the distributed controller of the ith DG in the DC subnet as a networking resource; The grid-following resources in the DC subgrid adopt primary droop control to operate in coordination with the grid-forming resources, and additional distributed secondary control is used to achieve the coordinated control objectives of each stage, as follows: Among them, w i,dc represents the active power-voltage droop coefficient of the ith DG in the DC subnet; Δp i,dc represents the total secondary control variable of the distributed controller of the ith DG in the DC subnet as a grid-following resource; In the AC / DC hybrid distribution network, multiple island partitions realize dynamic coordination of resources by connecting converters CC. CC is responsible for regulating the coordinated operation of different types of resources in the AC subnet and the DC subnet, and controlling the reactive output of CC to 0; the details are as follows: Among them, ω cc and They represent the actual value and reference value of the operating frequency of CC participating in the coordinated operation of the AC power grid; V cc and They represent the actual value and reference value of the operating voltage of CC participating in the coordinated operation of the DC grid; λ cc and η cc They represent the active-frequency droop coefficient of CC participating in the coordinated operation of AC power grid and the active-voltage droop coefficient of CC participating in the coordinated operation of DC power grid respectively; P cc Indicates the active power output by CC; Indicates whether CC participates in the coordinated operation of the AC power grid. If so, the value is 1, otherwise it is 0; Δp cc represents the total secondary control variable of the distributed controller of CC.

5. The method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 4, characterized in that: Step 3 includes: The networking resources in the DC subnet must ensure the stable operation of the island partition. The variable Δu of the distributed controller in the first stage of the networking resources S,dc Designed for: in, ΔV i,dc Indicates the deviation between the operating voltage of the ith DG in the DC subnet and the reference value; ΔP i ' j,dc =P i ' ,dc -P j ' ,dc , ΔP ij ' ,dc represents the output unit active power deviation between the ith DG and the jth DG in the DC subnet; c fd 、c pd Respectively represent ΔV i,dc and ΔP′ ij,dc The corresponding gain; d ij Indicates whether there is a communication link between the i-th DG and the j-th DG in the DC subnet. If yes, the value is 1, otherwise it is 0; α i,dc Indicates whether the i-th DG in the DC subnet enables voltage regulation, P′ i,dc P′ represents the unit active power output of the ith DG in the DC subnet. j,dc It represents the unit active power output by the jth DG in the DC subnet; The variable Δp of the distributed controller of the first stage of the grid-following resource in the DC subnet S,dc Designed for: Among them, c fgd 、c pgd They represent the gains corresponding to the variables that need to be adjusted in the design; ΔP ij,dc =P i,dc -P j,dc It represents the output active power deviation between the i-th DG and the j-th DG in the DC subnet, E rate is the rated capacity of DG, P j,dc Output active power of the jth DG in the DC subnet; The variable Δp of the distributed controller in the first stage of CC S,cc The design is as follows: in, Δω cc , ΔV cc They represent the deviations of the frequency of CC participating in the coordinated operation of the AC subnet and the voltage of CC participating in the coordinated operation of the DC subnet from the corresponding reference values; b ij Indicates whether there is a communication link between the ith DG and the jth DG in the AC subnet island partition and the DC subnet island partition of the CC interconnection. If yes, the value is 1, otherwise it is 0; ΔP ij,cc =P i,cc -P j,cc , ΔP ij,cc represents the output active power deviation of the i-th DG and the j-th DG in the AC subnet island partition and the DC subnet island partition of CC interconnection; c fcc 、c pcc 、c fdcc 、c pdcc They represent the gains corresponding to the variables that need to be adjusted in the design; α cc Indicates whether CC enables voltage regulation, P i,cc P represents the active power output of the ith DG in the AC subnet island partition and the DC subnet island partition interconnected by CC, j,cc It represents the active power output by the jth DG of the AC subnet island partition and the DC subnet island partition interconnected by CC.

6. A method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 5, characterized in that: Step 4 includes: To adjust the state of SSW, the variable Δu of the second-stage distributed controller of the network-forming resource in the DC subnet T,dc The design is as follows: Thu T,dc =c td b i,dc ΔV SSWd,k +c spd c i,dc ΔP S ′ SWd,k (7) Where, ΔV SSWd,k represents the voltage amplitude deviation across the kth SSW in the DC subnet; ΔP′ SSWd,k represents the unit active power flowing through the kth SSW of the DC subnet; β i,dc and γ i,dc They respectively represent whether the i-th DG of the DC subnet participates in regulating the SSW state to meet the closing or opening conditions. When the SSW changes from opening to closing, β i,dc =1,γ i,dc =0, when SSW changes from closed to open, β i,dc =0,γ i,dc =1, when SSW does not act, β i,dc =0,γ i,dc =0;c td 、c spd They respectively represent the gains corresponding to the various variables that need to be adjusted in the design; According to the state of SSW, the variable Δp of the second stage of distributed control of the grid-following resources in the DC subnet is adjusted T,dc The design is as follows: Δp T,dc =c tdg b i,dc ΔV SSWd,k +c spdg c i,dc ΔP SSWd,k (8) Among them, c tdg 、c spdg They represent the gains corresponding to the variables that need to be adjusted in the design; ΔP SSWd,k represents the active power flowing through the kth SSW in the DC subnet, ΔV SSWd,k is the voltage amplitude deviation across the kth SSW in the DC subnet; According to the state of SSW, the variable Δp of the distributed controller in the second stage of CC is adjusted T,cc The design is as follows: Among them, β cc and γ cc They respectively indicate whether CC participates in adjusting the SSW state to meet the closing or opening conditions when participating in the coordinated operation of the AC subnet. When the SSW changes from opening to closing, β cc =1,γ cc =0, when SSW changes from closed to open, β cc =0,γ cc =1, when SSW does not act, β cc =0,γ cc =0;β dcc and γ dcc They respectively indicate whether CC participates in adjusting the SSW state to meet the closing or opening conditions when participating in the coordinated operation of the DC subgrid. When the SSW changes from opening to closing, β dcc =1,γ dcc =0, when SSW changes from closed to open, β dcc =0,γ dcc =1, when SSW does not act, β dcc =0,γ dcc =0;c tcc 、c spcc 、c tdcc 、c spdcc They represent the gains corresponding to the variables that need to be adjusted in the design; Δθ SSWa,k represents the voltage phase deviation across the kth SSW in the AC subnet, ΔP SSWa,k It represents the active power flowing through the kth SSW in the AC subnet.

7. The method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 6, characterized in that: Step 5 includes: According to the state of the grid-connected switch, the variable Δu of the third-stage distributed controller of the grid-connected resource in the DC subnet is adjusted. R,dc The design is as follows: Δu R,dc =c θd λ i,dc ΔV DC (10) Where, ΔV DC Indicates the voltage amplitude deviation across the grid-connected switch connected to the DC subgrid; i,dc Indicates whether the i-th DG in the DC subnet needs to participate in adjusting the grid-connected switch state to meet the closing condition. When the grid-connected command is issued, λ i,dc =1, otherwise λ i,dc =0;c θd Indicates the gains corresponding to the various variables that need to be adjusted in the design; According to the state of the grid-connected switch, the variable Δp of the third-stage distributed controller of the grid-connected resource in the DC subnet is adjusted. R,dc The design is as follows: Δp R,dc =c θgd λ i,dc ΔV DC (11) Where c θgd Indicates the gains corresponding to the various variables that need to be adjusted in the design; According to the state of the grid-connected switch, the variable Δp of the distributed controller in the third stage of CC is adjusted R,cc The design is as follows: Among them, λ cc Indicates whether CC needs to participate in adjusting the grid-connected switch state to meet the closing condition when participating in the coordinated operation of the AC subnet. When the grid-connected command is issued, λ cc =1, otherwise λ cc =0;λ dcc Indicates whether CC needs to participate in adjusting the grid-connected switch state to meet the closing condition when participating in the coordinated operation of the DC subgrid. When the grid-connected command is issued, λ dcc =1, otherwise λ dcc =0;c θcc 、c zcc 、c θdcc They represent the gains corresponding to the variables that need to be adjusted in the design; Δθ C is the voltage phase deviation across the AC subgrid grid-connected switch, ΔV AC is the voltage amplitude deviation across the AC subgrid grid-connected switch.

8. The method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network according to claim 7, characterized in that:

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the computer program, the steps of the method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network as described in any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for distributed collaborative control of multiple resources in an AC / DC hybrid distribution network as described in any one of claims 1 to 8 are implemented.

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