A distributed control method and terminal of a micro-grid cluster system

Abstract

The application discloses a kind of micro-grid group system distributed control method and terminal, establish the distributed communication mode of micro-grid group system, the overall power shortage specific value of micro-grid group system is calculated based on distributed communication mode, with the minimum power interaction of the common grid connection point of micro-grid group system to establish objective function, and based on overall power shortage specific value establishes constraint condition, to build micro-grid group system energy scheduling model by this, and the output distribution strategy of each sub-micro-grid is obtained by solving model, and the output distribution strategy of each sub-micro-grid is issued and executed based on distributed communication mode, to realize the distributed communication between micro-grid of micro-grid group system, and the output distribution strategy of each sub-micro-grid is obtained by building micro-grid group system energy scheduling model through overall power shortage specific value, to compensate for power shortage, to effectively realize the supply and demand balance of micro-grid group system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro-grid group system control, and particularly relates to a distributed control method and terminal of a micro-grid group system. BACKGROUND

[0002] The existing energy system will accelerate the transformation to a new energy-based energy system. The traditional radial power grid power source is far away from the load, and long-distance transmission inevitably causes power loss or causes power grid operation safety problems. Distributed power (DG) is dispersed around the load, and the micro-grid effectively aggregates the regionally adjacent distributed power sources to quickly supply energy for the load, thereby relieving the power supply pressure of the power grid power source.

[0003] At present, domestic and foreign scholars have carried out a large amount of research on micro-grid technology, but the single micro-grid has small capacity and poor anti-interference ability. The micro-grid group interconnects the micro-grid systems adjacent in position, realizes energy interconnection of each region in the micro-grid group through coordinated control of each micro-grid in the micro-grid group, improves the self-balancing rate of the system, and improves the anti-interference ability. The safe and stable operation of the micro-grid group needs to be based on the mutual coordination mechanism between each micro-grid, to realize the mutual coordination between the micro-grid group and the micro-grid, and between the micro-grids. However, compared with the single micro-grid, the composition structure and control complexity of the micro-grid group system are greatly increased. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a distributed control method and terminal of a micro-grid group system, which can effectively realize the supply-demand balance of the micro-grid group system.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A distributed control method of a micro-grid group system, comprising the steps of:

[0007] establishing a distributed communication mode of the micro-grid group system;

[0008] calculating a specific value of a whole power shortage of the micro-grid group system based on the distributed communication mode;

[0009] establishing a target function with minimization of power interaction amount of a common grid-connected point of the micro-grid group system, and establishing a constraint condition based on the specific value of the whole power shortage;

[0010] constructing a micro-grid group system energy scheduling model according to the target function and the constraint condition, and solving the micro-grid group system energy scheduling model to obtain an output distribution strategy of each micro-grid in the micro-grid group system;

[0011] Distribute and execute the output distribution strategy of each sub-micro grid based on the distributed communication mode.

[0012] To solve the above technical problems, another technical solution adopted by the present application is:

[0013] A distributed control terminal of a micro grid group system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0014] Establish a distributed communication mode of the micro grid group system;

[0015] Calculate a specific value of the overall power shortage of the micro grid group system based on the distributed communication mode;

[0016] Establish an objective function based on the minimization of the power interaction amount at the common grid connection point of the micro grid group system, and establish a constraint condition based on the specific value of the overall power shortage;

[0017] Construct an energy scheduling model of the micro grid group system according to the objective function and the constraint condition, and solve the energy scheduling model of the micro grid group system to obtain an output distribution strategy of each sub-micro grid in the micro grid group system;

[0018] Distribute and execute the output distribution strategy of each sub-micro grid based on the distributed communication mode.

[0019] The present application has the beneficial effects that: a distributed communication mode of the micro grid group system is established, a specific value of the overall power shortage of the micro grid group system is calculated based on the distributed communication mode, an objective function is established based on the minimization of the power interaction amount at the common grid connection point of the micro grid group system, and a constraint condition is established based on the specific value of the overall power shortage, an energy scheduling model of the micro grid group system is constructed according to the objective function and the constraint condition, the model is solved, an output distribution strategy of each sub-micro grid is obtained, the output distribution strategy of each sub-micro grid is distributed and executed based on the distributed communication mode, the distributed communication between the micro grids of the micro grid group system is realized, the output distribution strategy of each sub-micro grid is obtained by constructing the energy scheduling model of the micro grid group system based on the specific value of the overall power shortage, the power shortage of each sub-micro grid is compensated, and the supply-demand balance of the micro grid group system is effectively realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A step flowchart of a distributed control method of a micro grid group system according to an embodiment of the present application;

[0021] Figure 2 A structural schematic diagram of a distributed control terminal of a micro grid group system according to an embodiment of the present application;

[0022] Figure 3 A micro-grid group system communication schematic diagram in a distributed control method of a micro-grid group system of an embodiment of the present application. DETAILED DESCRIPTION

[0023] To make the technical content of the present application, the achieved purposes and effects clear, the following will be described in combination with the embodiments and the accompanying drawings.

[0024] Please refer to Figure 1 A distributed control method of a micro-grid group system, comprising the steps of:

[0025] establishing a distributed communication mode of the micro-grid group system;

[0026] calculating a specific value of a total power shortage of the micro-grid group system based on the distributed communication mode;

[0027] establishing an objective function based on minimization of a power interaction amount at a common grid connection point of the micro-grid group system, and establishing a constraint condition based on the specific value of the total power shortage;

[0028] constructing a micro-grid group system energy scheduling model according to the objective function and the constraint condition, and solving the micro-grid group system energy scheduling model to obtain an output distribution strategy of each sub-micro-grid in the micro-grid group system;

[0029] issuing and executing the output distribution strategy of each sub-micro-grid based on the distributed communication mode.

[0030] From the above description, the beneficial effects of the present application are that a distributed communication mode of the micro-grid group system is established, a specific value of a total power shortage of the micro-grid group system is calculated based on the distributed communication mode, an objective function is established based on minimization of a power interaction amount at a common grid connection point of the micro-grid group system, and a constraint condition is established based on the specific value of the total power shortage, a micro-grid group system energy scheduling model is constructed according to the objective function and the constraint condition, and the model is solved to obtain an output distribution strategy of each sub-micro-grid, the output distribution strategy of each sub-micro-grid is issued and executed based on the distributed communication mode, thereby realizing distributed communication among micro-grids of the micro-grid group system, and the output distribution strategy of each sub-micro-grid is obtained by constructing a micro-grid group system energy scheduling model based on the specific value of the total power shortage, the power shortage of each sub-micro-grid is compensated, and thus the supply-demand balance of the micro-grid group system is effectively realized.

[0031] Further, the establishment of the distributed communication mode of the micro-grid group system comprises:

[0032] selecting a distributed power supply in each sub-micro-grid of the micro-grid group system as a communication node, and selecting other distributed power supplies in each sub-micro-grid except the communication node as candidate agent nodes of the communication node;

[0033] iterating state variables of each of the communication nodes based on a consensus algorithm;

[0034] In the iterating process, if any of the communication nodes fails, a proxy node is determined from the candidate proxy nodes based on a proxy node selection mechanism, and the proxy node is used to replace the failed communication node.

[0035] From the above description, a distributed power supply is selected as a communication node from each sub-microgrid in the microgrid group system, the communication node is responsible for communication between sub-microgrids, state variables of each communication node are iterated based on a consensus algorithm, distributed control results of the entire system converge to a unified value, in the iterating process, when a communication node fails, the remaining distributed power supplies can quickly respond by using a proxy node selection mechanism, uninterrupted communication within the microgrid group is ensured, and thus the reliability of distributed communication of the microgrid group system is improved.

[0036] Further, the calculating the specific value of the overall power shortage of the microgrid group system based on the distributed communication mode comprises:

[0037] selecting any of the communication nodes based on the distributed communication mode, and evaluating the overall power shortage of the microgrid group system based on a power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value;

[0038] calculating the specific value of the overall power shortage according to the overall power shortage evaluation value.

[0039] From the above description, the overall power shortage of the microgrid group system is evaluated based on the power estimator accessed by the selected communication node, and then the specific value of the overall power shortage is calculated according to the overall power shortage evaluation value, so that the power shortage to be made up can be accurately understood, and the supply-demand balance of the system can be realized subsequently.

[0040] Further, the evaluating the overall power shortage of the microgrid group system based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value comprises:

[0041]

[0042] wherein, represents the overall power shortage evaluation value of the microgrid group i, represents a first parameter coefficient of the power estimator, d ij represents the transmission power between the microgrid i and the microgrid j, represents the overall power shortage evaluation value of the microgrid group j, represents the average power of the microgrid i, Ei represents the output power of the distributed power supply of the micro-grid i, represents the second parameter coefficient of the power estimator, w j represents the change amount of the output power of the micro-grid j, w i represents the change amount of the output power of the micro-grid i, P PSi represents the exchange power of the tie line between the micro-grids, represents the maximum change amount of the distributed power during the evaluation of the overall power shortage difference of the micro-grid group, k represents the total number of micro-grid groups adjacent to the micro-grid group i;

[0043] The calculation of the specific value of the overall power shortage from the overall power shortage evaluation value comprises:

[0044]

[0045] In the formula, represents the specific value of the overall power shortage.

[0046] As can be seen from the above description, the calculation of the specific value of the overall power shortage from the overall power shortage evaluation value is more accurate and reliable.

[0047] Further, the target function is established by minimizing the power interaction amount of the common grid connection point of the micro-grid group system as:

[0048] min E pcc = K Ad A d + K Ac A c + K G G;

[0049] In the formula, E pcc represents the power interaction amount of the common grid connection point of the micro-grid group system, K Ad represents the discharge cost matrix of the micro-grid group, A d represents the output power of each sub-micro-grid in the micro-grid group, K Ac represents the purchase cost matrix of the micro-grid group, A c represents the consumption power of each sub-micro-grid in the micro-grid group, K G represents the power generation cost matrix of the distributed power supply of the micro-grid group, and G represents the output power of the distributed power supply of each sub-micro-grid in the micro-grid group.

[0050] The constraint condition is established based on the specific value of the overall power shortage as:

[0051]

[0052] E out = A c -A d + G;

[0053] 0≤A c ≤A e,i,t ;

[0054] 0≤A d ≤A s,i,t ;

[0055] A c A d =0;

[0056] 0≤E RaR,i ≤E RaR,i,t ;

[0057] 0≤E LaR,i ≤E LaR,i,t ;

[0058] 0≤G≤G max ;

[0059] In the formula, E out represents the total net output power of the energy storage and the distributed power supply in the micro-grid group, m represents the total number of micro-grid groups, represents the specific value of the overall power shortage, E RaR,i represents the standby power of the micro-grid group, E LaR,i represents the shortage power of the micro-grid group, A e,i,t represents the first state variable of the micro-grid at time t, A s,i,t represents the second state variable of the micro-grid at time t, E RaR,i,t represents the third state variable of the micro-grid at time t, E LaR,i,t represents the fourth state variable of the micro-grid at time t, G max represents the maximum output power of the distributed power supply of each sub-micro-grid in the micro-grid group.

[0060] As can be seen from the above description, the objective function is established by minimizing the power interaction amount of the common grid connection point of the micro-grid group system, and the constraint condition is established based on the specific value of the overall power shortage, so that the output of the distributed power supply in each sub-micro-grid of the micro-grid group can be dispatched according to the overall power shortage of the micro-grid group system, the power mutual aid between regions is realized, and the supply and demand balance in the micro-grid group is effectively realized through the power interaction on the tie line.

[0061] Please refer to Figure 2 A distributed control terminal of a micro-grid group system, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the following steps when executing the computer program:

[0062] Establishing a distributed communication mode of the micro-grid group system;

[0063] calculate a specific value of the overall power shortage of the micro-grid group system based on the distributed communication mode;

[0064] establish a target function based on minimization of power interaction at a common grid connection point of the micro-grid group system, and establish a constraint condition based on the specific value of the overall power shortage;

[0065] construct a micro-grid group system energy scheduling model according to the target function and the constraint condition, and solve the micro-grid group system energy scheduling model to obtain an output distribution strategy of each sub-micro-grid in the micro-grid group system;

[0066] issue and execute the output distribution strategy of each sub-micro-grid based on the distributed communication mode.

[0067] From the above description, the beneficial effects of the present application are that: a distributed communication mode of a micro-grid group system is established, a specific value of the overall power shortage of the micro-grid group system is calculated based on the distributed communication mode, a target function is established based on minimization of power interaction at a common grid connection point of the micro-grid group system, and a constraint condition is established based on the specific value of the overall power shortage, a micro-grid group system energy scheduling model is constructed according to the target function and the constraint condition, and the model is solved to obtain an output distribution strategy of each sub-micro-grid, the output distribution strategy of each sub-micro-grid is issued and executed based on the distributed communication mode, thereby realizing distributed communication between micro-grids of the micro-grid group system, and the output distribution strategy of each sub-micro-grid is obtained by constructing a micro-grid group system energy scheduling model based on the specific value of the overall power shortage, which compensates for the power shortage of itself, thereby effectively realizing supply-demand balance of the micro-grid group system.

[0068] Further, the establishment of the distributed communication mode of the micro-grid group system comprises:

[0069] selecting a distributed power supply in each sub-micro-grid of the micro-grid group system as a communication node, and selecting other distributed power supplies in each sub-micro-grid except the communication node as candidate agent nodes of the communication node;

[0070] iterating state variables of each communication node based on a consensus algorithm;

[0071] In the process of iteration, if any communication node fails, an agent node is determined from the candidate agent nodes based on an agent node selection mechanism, and the agent node is used to replace the failed communication node.

[0072] From the above description, a distributed power supply is selected as a communication node from each sub-micro grid in the micro grid group system, the communication node is responsible for communication between sub-micro grids, the state variables of each communication node are iterated based on a consistency algorithm, distributed control results of the whole system are converged to a unified value, when a communication node fails in the iteration process, the remaining distributed power supply can quickly respond by using an agent node selection mechanism, uninterrupted communication inside the micro grid group is ensured, and the reliability of distributed communication of the micro grid group system is improved.

[0073] Further, the calculation of the specific value of the overall power shortage of the micro grid group system based on the distributed communication mode comprises:

[0074] An arbitrary communication node is selected based on the distributed communication mode, and the overall power shortage of the micro grid group system is evaluated based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value;

[0075] The specific value of the overall power shortage is calculated according to the overall power shortage evaluation value.

[0076] From the above description, the overall power shortage of the micro grid group system is evaluated based on the power estimator accessed by the selected communication node, and the specific value of the overall power shortage is calculated according to the overall power shortage evaluation value, so that the power shortage to be made up can be accurately understood, and the supply-demand balance of the system can be realized subsequently.

[0077] Further, the evaluation of the overall power shortage of the micro grid group system based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value comprises:

[0078]

[0079] In the formula, P i represents the overall power shortage evaluation value of the micro grid group i, d represents the first parameter coefficient of the power estimator, ij P ij represents the transmission power between the micro grid i and the micro grid j, P j represents the overall power shortage evaluation value of the micro grid group j, E i represents the average power of the micro grid i, i P i represents the output power of the distributed power supply of the micro grid i, w represents the second parameter coefficient of the power estimator, j w represents the change amount of the output power of the micro grid j, i P i represents the change amount of the output power of the micro grid i, PSi P ij represents the exchange power of the tie line between the micro grids, represents the extreme value of the distributed variation when the overall power shortage difference of the micro-grid group is evaluated, k represents the total number of micro-grid groups adjacent to the micro-grid group i;

[0080] The overall power shortage specific value is calculated according to the overall power shortage evaluation value, which includes:

[0081]

[0082] In the formula, represents the overall power shortage specific value.

[0083] According to the above description, the overall power shortage specific value is calculated according to the overall power shortage evaluation value, which is more accurate and reliable.

[0084] Further, the target function is established by minimizing the power interaction amount of the common grid connection point of the micro-grid group system, which is:

[0085] minE pcc =K Ad A d +K Ac A c +K G G;

[0086] In the formula, E pcc represents the power interaction amount of the common grid connection point of the micro-grid group system, K Ad represents the micro-grid group discharge cost matrix, A d represents the output power of each sub-micro-grid in the micro-grid group, K Ac represents the micro-grid group power purchase cost matrix, A c represents the consumption power of each sub-micro-grid in the micro-grid group, K G represents the micro-grid group distributed power generation cost matrix, and G represents the output power of the distributed power source in each sub-micro-grid in the micro-grid group.

[0087] The constraint condition is established based on the overall power shortage specific value, which includes:

[0088]

[0089] E out =A c -A d +G;

[0090] 0≤A c ≤A e,i,t ;

[0091] 0≤A d ≤A s,i,t ;

[0092] A c Ad = 0;

[0093] 0 ≤ E RaR,i ≤ E RaR,i,t ;

[0094] 0 ≤ E LaR,i ≤ E LaR,i,t ;

[0095] 0 ≤ G ≤ G max ;

[0096] In the formula, E out represents the total net output power of the energy storage and the distributed power supply in the micro-grid group, m represents the total number of micro-grid groups, represents the specific value of the overall power shortage, E RaR,i represents the standby power of the micro-grid group, E LaR,i represents the power shortage of the micro-grid group, A e,i,t represents the first state variable of the micro-grid at time t, A s,i,t represents the second state variable of the micro-grid at time t, E RaR,i,t represents the third state variable of the micro-grid at time t, E LaR,i,t represents the fourth state variable of the micro-grid at time t, G max represents the maximum output power of the distributed power supply of each sub-micro-grid in the micro-grid group.

[0097] As can be known from the above description, the objective function is established by minimizing the power interaction amount of the common grid connection point of the micro-grid group system, and the constraint condition is established based on the specific value of the overall power shortage, so that the output of the distributed power supply in each sub-micro-grid of the micro-grid group system can be dispatched according to the overall power shortage of the micro-grid group system, the power mutual aid between regions is realized, and the supply and demand balance in the micro-grid group is effectively realized through the power interaction on the tie line.

[0098] The above-mentioned distributed control method and terminal of the micro-grid group system of the application can be applied to the micro-grid group system considering the access of the distributed power supply, and the following will be described through specific embodiments:

[0099] Please refer to Figure 1 and Figure 3 , the embodiment one of the application is:

[0100] A distributed control method of a micro-grid group system, comprising the steps of:

[0101] S1, establishing a distributed communication mode of the micro-grid group system, specifically comprising S11-S12:

[0102] S11, selecting a distributed power supply as a communication node from each sub-microgrid in the microgrid group system, and selecting other distributed power supplies in each sub-microgrid as candidate agent nodes of the communication node.

[0103] S12, iteratively updating state variables of each communication node based on a consensus algorithm; during the iteration, if any communication node fails, an agent node is determined from the candidate agent nodes based on an agent node selection mechanism, and the agent node is used to replace the failed communication node.

[0104] The iterative updating of the state variables of each communication node based on the consensus algorithm comprises:

[0105]

[0106] wherein, represents the rate of change of the state variable of node v i at time t, N i represents the set of adjacent nodes of node v i , a ij represents the element of the state transition matrix A, X i (t) represents the state variable of node v i , X j (t) represents the state variable of node v j . The state variable is any data that needs to be interacted, such as the power flowing into or out of the node.

[0107] Using the Metropolis method (an algorithm for Monte Carlo simulation), the above formula can be discretized as:

[0108]

[0109] wherein, X i (k+1) represents the state variable of node v i at the k+1th iteration, X j (k) represents the state variable of node v j at the kth iteration, s i represents the number of adjacent nodes of node v i , s j represents the number of adjacent nodes of node v j .

[0110] If any communication node fails during the iteration, an agent node is determined from the candidate agent nodes based on an agent node selection mechanism, and the agent node is used to replace the failed communication node, comprising:

[0111] Each sub-microgrid in the microgrid cluster system contains n i distributed power nodes, and the controller of each distributed power stores a candidate agent node list in order During communication, each distributed power node needs to maintain two information, one is the optimal agent node number u i with the highest priority among its adjacent nodes, and the other is the list L i The list L i stores the optimal agent node value in the last iteration period, and the two information satisfy the following formula:

[0112] u i =f max (L i );

[0113] In the formula, f max (·) represents a function of determining the optimal agent node with the highest priority.

[0114] (1) The first iteration selects l1 as the initial agent node, that is, the communication node, so u i =l1, and the value of the list L i maintained by each node is l1. For example, a microgrid contains four distributed power nodes numbered 1, 2, 3, and 4, and the candidate agent node list L=(1, 2, 3, 4), that is, the priority of power 1 is the highest, and the priority of power 4 is the lowest. At this time, it is the first iteration, and power 1 is selected as the communication node, so u i =1.

[0115] (2) Each node sends u i to its adjacent nodes during the iteration period, and each node updates the list L i based on the above formula after receiving the optimal agent node value feedback from all adjacent nodes. Based on the example in (1), since the communication node is power 1 in this iteration, each node sends the information that the communication node is 1 to the adjacent nodes. Therefore, the list maintained by each node is (1, 1, 1, 1).

[0116] (3) Each iteration judges whether the adjacent node j of each node i is faulty, if so, and u i =j, then set all values equal to j in the list L i to zero; when u i =f max (L i ) exists, u i is normally updated, otherwise u i= i, and at the next iteration, node i sends the information that node j exits. Based on (2), if power 1 fails before the beginning of this step, each node judges the adjacent nodes in this step. At this time, each node finds that power 1 fails, and power 1 is the communication node, so each value in the list of each node is 0, i.e., the list of each node is (0, 0, 0, 0). And u i = f max (L i ) has no solution, then reset u i = i. That is, node 2 considers that the optimal proxy node is 2, node 3 considers that the optimal proxy node is 3, and node 4 considers that the optimal proxy node is 4.

[0117] (4) In each iteration, it is judged whether the adjacent node j of each node i is recovered from the failure state and re-joins, if so, u i = i. That is, if power 1 is added to the operation again, it is considered that u1 = 1, and it is transmitted to other nodes, which is used for updating the list of each node in the next iteration period.

[0118] (5) In each iteration, it is judged whether each node i receives the signal that the adjacent node j exits the operation, if so, (3) is executed to update u i and is transmitted to the adjacent nodes.

[0119] (6) In each iteration, if the node satisfies u i = i, the node becomes the candidate proxy node of the communication node, and still maintains u w = i in the next 2(n0-s i ) iterations, n0 represents the number of nodes that have not exited in the system, and s w represents the number of nodes that have not exited among the adjacent nodes of node i.

[0120] S2, calculating the specific value of the overall power shortage of the micro-grid group system based on the distributed communication mode, specifically comprising S21-S22:

[0121] S21, selecting any communication node based on the distributed communication mode, and evaluating the overall power shortage of the micro-grid group system based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value, specifically:

[0122]

[0123] In the formula, P represents the overall power shortage evaluation value of the micro-grid group i, represents the first parameter coefficient of the power estimator, d ij represents the transmission power between the micro-grid i and the micro-grid j, an overall power shortage evaluation value of the micro-grid group j, an average power of the micro-grid i, E i an output power of the distributed power supply of the micro-grid i, a second parameter coefficient of the power estimator, w j a variation of the output power of the micro-grid j, w i a variation of the output power of the micro-grid i, P PSi an exchange power of the tie line between the micro-grids, a maximum variation of the distributed power supply when the overall power shortage difference evaluation value of the micro-grid group is evaluated, k represents the total number of micro-grid groups adjacent to the micro-grid group i;

[0124] S22, calculating an overall power shortage specific value according to the overall power shortage evaluation value, specifically comprising:

[0125]

[0126] wherein, an overall power shortage specific value.

[0127] S3, establishing a target function with the minimum power interaction of the common grid connection point of the micro-grid group system, and establishing a constraint condition based on the overall power shortage specific value.

[0128] wherein, the target function established with the minimum power interaction of the common grid connection point of the micro-grid group system is:

[0129] min E pcc = K Ad A d + K Ac A c + K G G;

[0130] wherein, E pcc represents the power interaction of the common grid connection point of the micro-grid group system, K Ad represents the discharge cost matrix of the micro-grid group, A d represents the output power of each sub-micro-grid in the micro-grid group, K Ac represents the purchase cost matrix of the micro-grid group, A c represents the consumption power of each sub-micro-grid in the micro-grid group, K G represents the power generation cost matrix of the distributed power supply of the micro-grid group, G represents the output power of the distributed power supply of each sub-micro-grid in the micro-grid group;

[0131] the constraint condition established based on the overall power shortage specific value is:

[0132]

[0133] E out =A c -A d +G;

[0134] 0≤A c ≤A e,i,t ;

[0135] 0≤A d ≤A s,i,t ;

[0136] A c A d =0;

[0137] 0≤E RaR,i ≤E RaR,i,t ;

[0138] 0≤E LaR,i ≤E LaR,i,t ;

[0139] 0≤G≤G max ;

[0140] In the formula, E out This represents the total net output power of energy storage and distributed generation within the microgrid group, where m represents the total number of microgrid groups. E represents the specific value of the overall power deficit. RaR,i E represents the reserve power of a microgrid group. LaR,i A represents the shortfall in electricity for the microgrid group. e,i,t Let A represent the first state variable of the microgrid at time t. s,i,t E represents the second state variable of the microgrid at time t. RaR,i,t E represents the third state variable of the microgrid at time t. LaR,i,t Let G represent the fourth state variable of the microgrid at time t. max This represents the maximum output power of distributed power sources in each sub-microgrid within the microgrid group.

[0141] S4. Construct a microgrid group system energy dispatch model based on the objective function and the constraints, and solve the microgrid group system energy dispatch model to obtain the power allocation strategy of each sub-microgrid in the microgrid group system.

[0142] S5. Issue and execute the power allocation strategy for each sub-microgrid based on the distributed communication method.

[0143] Specifically, the power allocation strategy of each sub-microgrid is issued based on the distributed communication method, and the communication node supervises each distributed power source to execute the power allocation strategy of each sub-microgrid.

[0144] As Figure 3 shown, Figure 3 The micro-grid group system is composed of three sub-micro-grids, each of which includes four distributed power supply nodes v1-v4, and the distributed power supply nodes communicate with each other, and the communication content is the obtained output distribution strategy.

[0145] Please refer to Figure 2 , the second embodiment of the present application is:

[0146] A distributed control terminal of a micro-grid group system, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements each step in the distributed control method of the micro-grid group system in the first embodiment when executing the computer program.

[0147] In summary, the present application provides a distributed control method and terminal of a micro-grid group system, establishes a distributed communication mode of the micro-grid group system, calculates the specific value of the overall power shortage of the micro-grid group system based on the distributed communication mode, establishes an objective function based on the minimum power interaction of the common grid connection point of the micro-grid group system, and establishes a constraint condition based on the specific value of the overall power shortage, thereby constructing an energy scheduling model of the micro-grid group system, solving the model, obtaining the output distribution strategy of each sub-micro-grid, and issuing and executing the output distribution strategy of each sub-micro-grid based on the distributed communication mode, thereby realizing distributed communication between micro-grids in the micro-grid group system, and effectively realizing supply and demand balance of the micro-grid group system by constructing the energy scheduling model of the micro-grid group system based on the specific value of the overall power shortage to obtain the output distribution strategy of each sub-micro-grid and compensate for the power shortage of itself.

[0148] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in related technical fields based on the content of the specification and drawings of the present application is also included in the patent protection scope of the present application.

Claims

1. A method for distributed control of a microgrid cluster system, the method comprising: The method comprises the steps of: establishing a distributed communication mode of the micro-grid group system; calculating a specific value of overall power shortage of the micro-grid group system based on the distributed communication mode; establishing an objective function by minimizing power interaction at a common grid connection point of the micro-grid group system, and establishing a constraint condition based on the specific value of overall power shortage; constructing a micro-grid group system energy scheduling model according to the objective function and the constraint condition, and solving the micro-grid group system energy scheduling model to obtain an output distribution strategy of each sub-micro-grid in the micro-grid group system; issuing and executing the output distribution strategy of each sub-micro-grid based on the distributed communication mode; the step of establishing the distributed communication mode of the micro-grid group system comprises: selecting a distributed power supply in each sub-micro-grid of the micro-grid group system as a communication node, and selecting other distributed power supplies in each sub-micro-grid except the communication node as candidate agent nodes of the communication node; iterating state variables of each communication node based on a consensus algorithm; in the iteration process, if any communication node fails, an agent node is determined from the candidate agent nodes based on an agent node selection mechanism, and the agent node is used to replace the failed communication node; the step of calculating the specific value of overall power shortage of the micro-grid group system based on the distributed communication mode comprises: selecting an arbitrary communication node based on the distributed communication mode, and evaluating overall power shortage of the micro-grid group system based on a power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value; calculating the specific value of overall power shortage according to the overall power shortage evaluation value; the step of establishing the objective function by minimizing power interaction at the common grid connection point of the micro-grid group system comprises: ； In the formula, represents the power interaction quantity of the public grid-connected point of the micro-grid group system, represents a micro-grid group discharge cost matrix, represents the output power of each sub-micro-grid in the micro-grid group, represents a micro-grid group power purchase cost matrix, represents the consumption power of each sub-micro-grid in the micro-grid group, represents a micro-grid group distributed power generation cost matrix, and G represents the output power of the distributed power source of each sub-micro-grid in the micro-grid group. the step of establishing the constraint condition based on the specific value of overall power shortage comprises: ； ； ； ； ； ； ； ； wherein, represents the total net output power of the energy storage and the distributed power supply in the micro-grid group, and m represents the total number of the micro-grid groups, represents the specific value of the overall power shortage, represents the standby power of the micro-grid group, represents the shortage power of the micro-grid group, represents the first state variable of the micro-grid at time t, represents the second state variable of the micro-grid at time t, represents the third state variable of the micro-grid at time t, represents the fourth state variable of the micro-grid at time t, represents the maximum output power of the distributed power supply of each sub-micro-grid in the micro-grid group.

2. The method of claim 1, wherein, the step of evaluating overall power shortage of the micro-grid group system based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value comprises: ； ； In the formula, represents the overall power shortage evaluation value of the micro-grid group i, represents the first parameter coefficient of the power estimator, represents the transmission power between the micro-grid i and the micro-grid j, represents the overall power shortage evaluation value of the micro-grid group j, represents the average power of the micro-grid i, represents the output power of the distributed power supply of the micro-grid i, represents the second parameter coefficient of the power estimator, represents the change amount of the micro-grid j output power, represents the change amount of the micro-grid i output power, represents the exchange power of the inter-micro-grid tie line, represents the distributed change amount extreme value when the overall power shortage difference value of the micro-grid group is evaluated, and k represents the total number of micro-grid groups adjacent to the micro-grid group i. the step of calculating the specific value of overall power shortage according to the overall power shortage evaluation value comprises: ； In the formula, represents the specific value of the overall power deficit.

3. A distributed control terminal of a microgrid cluster system, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program comprises the following steps of: receiving a control command from a master control terminal; determining a control strategy according to the control command; and sending a control signal to a microgrid according to the control strategy. the processor executes the computer program to realize the following steps: establishing a distributed communication mode of the micro-grid group system; calculating a specific value of overall power shortage of the micro-grid group system based on the distributed communication mode; establishing an objective function by minimizing power interaction at a common grid connection point of the micro-grid group system, and establishing a constraint condition based on the specific value of overall power shortage; constructing a micro-grid group system energy scheduling model according to the objective function and the constraint condition, and solving the micro-grid group system energy scheduling model to obtain an output distribution strategy of each sub-micro-grid in the micro-grid group system; issuing and executing the output distribution strategy of each sub-micro-grid based on the distributed communication mode; the step of establishing the distributed communication mode of the micro-grid group system comprises: selecting a distributed power supply as a communication node from each sub-microgrid in the microgrid group system, and selecting other distributed power supplies in each sub-microgrid as candidate agent nodes of the communication node; iterating state variables of each communication node based on a consensus algorithm; in the iteration process, if any communication node fails, an agent node is determined from the candidate agent nodes based on an agent node selection mechanism, and the agent node is used to replace the failed communication node; the specific value of the overall power shortage of the microgrid group system is calculated based on the distributed communication mode, including: selecting any communication node based on the distributed communication mode, and evaluating the overall power shortage of the microgrid group system based on a power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value; calculating the specific value of the overall power shortage according to the overall power shortage evaluation value; the objective function is established by minimizing the power interaction amount of the common grid connection point of the microgrid group system, including: ； In the formula, represents the power interaction quantity of the public grid-connected point of the micro-grid group system, represents the micro-grid group discharge cost matrix, represents the output power of each sub-micro-grid in the micro-grid group, represents the micro-grid group power purchase cost matrix, represents the accommodation power of each sub-micro-grid in the micro-grid group, represents the micro-grid group distributed power generation cost cost matrix, and G represents the output power of the distributed power supply of each sub-micro-grid in the micro-grid group. the constraint condition is established based on the specific value of the overall power shortage, including: ； ； ； ； ； ； ； ； wherein, represents the total net output power of the energy storage and the distributed power supply in the micro-grid group, and m represents the total number of the micro-grid groups, represents the specific value of the overall power shortage, represents the standby power of the micro-grid group, represents the power shortage of the micro-grid group, represents the first state variable of the micro-grid at time t, represents the second state variable of the micro-grid at time t, represents the third state variable of the micro-grid at time t, represents the fourth state variable of the micro-grid at time t, represents the maximum output power of the distributed power supply of each sub-micro-grid in the micro-grid group.

4. The distributed control terminal of a microgrid cluster system according to claim 3, characterized by, the overall power shortage of the microgrid group system is evaluated based on the power estimator accessed by the selected communication node to obtain an overall power shortage evaluation value, including: ； ； In the formula, represents the overall power shortage evaluation value of the micro-grid group i, represents the first parameter coefficient of the power estimator, represents the transmission power between the micro-grid i and the micro-grid j, represents the overall power shortage evaluation value of the micro-grid group j, represents the average power of the micro-grid i, represents the output power of the distributed power supply of the micro-grid i, represents the second parameter coefficient of the power estimator, represents the change amount of the output power of the micro-grid j, represents the change amount of the output power of the micro-grid i, represents the exchange power of the inter-micro-grid tie line, represents the extreme value of the distributed change amount when the overall power shortage difference of the micro-grid group is evaluated, and k represents the total number of micro-grid groups adjacent to the micro-grid group i. the specific value of the overall power shortage is calculated according to the overall power shortage evaluation value, including: ； In the formula, represents the specific value of the overall power deficit.

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