WO2018058804A1 - 通用型包含恒功率和下垂控制的微电网群分布式控制方法 - Google Patents
通用型包含恒功率和下垂控制的微电网群分布式控制方法 Download PDFInfo
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- WO2018058804A1 WO2018058804A1 PCT/CN2016/110479 CN2016110479W WO2018058804A1 WO 2018058804 A1 WO2018058804 A1 WO 2018058804A1 CN 2016110479 W CN2016110479 W CN 2016110479W WO 2018058804 A1 WO2018058804 A1 WO 2018058804A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
Definitions
- the invention belongs to the field of micro-grid operation control, and in particular relates to a general-purpose distributed control method for micro-grid groups including constant power and droop control.
- the microgrid is an energy system that includes distributed generation equipment, energy storage devices, and local loads, and has certain self-regulation and control capabilities.
- the microgrid group is an effective way to solve the problems caused by the high-density access of distributed power sources, and will play an important role in the future smart distribution network.
- Control strategies based on multi-agent systems are recognized to play an important role in maintaining microgrid stability, including centralized and distributed control.
- centralized control which is used to process a large amount of data and is prone to failure.
- the advantages of distributed control include anti-indetermination interference and distributed information update capabilities, so that information can be effectively shared, ultimately making decision making and implementation more rapid.
- the containment control is an effective distributed control method for multi-agent systems. By pinning some nodes, the control can reduce the number of controllers of large complex control systems. Usually, such systems are difficult to implement by adding controllers to all nodes.
- the technical problem to be solved by the present invention is to provide a general-purpose distributed control method for a micro-grid group including constant power and droop control, the control method including a distributed power supply of two methods: droop control and constant power control
- the control method including a distributed power supply of two methods: droop control and constant power control
- the method eliminates the need for the central controller and the complicated communication topology, and only needs to be controlled. Part of the agent is pinned, and the remaining agents are synchronized with the pinning agent through communication coupling, thereby reducing the number of controllers.
- Distributed power control and mutual information interaction are handled by the multi-agent system, each distributed power source corresponds to a proxy, distribution The number of the power source is the same as the number of the agent corresponding to the distributed power source; wherein, some of the agents are controlled pinning agents, and the remaining agents track the synchronization in a distributed manner through communication with the pinning agent;
- the control method includes The following steps:
- Step 10 performing a control to maintain the power balance of the microgrid group
- Step 20 determining a predefined group consistency convergence value of the pinning agent
- Step 30 The agent other than the agent is seeking group consistency through the communication coupling and the pinning agent;
- Step 40 Adjust the output power to complete the secondary control.
- the step 10) specifically includes: in the island mode, when the microgrid group is disturbed, the distributed power cluster of the droop control automatically performs the primary control as shown in the formula (1), and the distribution of the droop control
- the power supply operates in a peer-to-peer control mode to maintain the power balance of the microgrid group:
- f i represents the frequency of the i-th droop controlled distributed power source
- f n,i represents the initial value of the distributed power frequency of the i-th droop control
- m P,i represents the distributed power of the i-th droop control Active droop coefficient
- P i represents the active power of the distributed power output of the i-th droop control
- P 0,i represents the initial value of the active power of the distributed power supply of the i-th droop control
- U i represents the i-th droop control voltage distributed power
- U n, i denotes an i-th reference voltage distributed power droop control
- n Q, i represents the i th coefficient reactive droop droop control of distributed power sources
- Q i denotes The reactive power output of the distributed power supply of the droop control
- Q 0,i represents the initial value of the reactive power of the distributed power supply of the i-th d
- the step 20) specifically includes: determining, under an uncertain communication topology, a predefined group consistency convergence value of the pinning agent, including a pinning agent pre-defined group consistency value based on the droop control, and based on constant power control.
- the pinning agent pre-defined group consistency value includes: determining, under an uncertain communication topology, a predefined group consistency convergence value of the pinning agent, including a pinning agent pre-defined group consistency value based on the droop control, and based on constant power control.
- the active preset group consistency value of the kth droop-controlled distributed power cluster Represents the active deficit in the entire microgrid group, ⁇ k, D represents the total number of non-zero participation factors in the kth droop control distributed power cluster, Representing the k-th reactive preset group consistency value based on the droop control distributed power cluster, Represents the lack of power in the entire microgrid group, Representing the kth frequency preset group consistency value based on the droop control distributed power cluster, Indicates the voltage pre-group consistency value of the kth droop-controlled distributed power cluster, m P,i represents the active droop coefficient, and n Q,i represents the reactive droop coefficient;
- the step 30) specifically includes: causing distributed power clusters and clusters by pinning control Other agents in the same time track the synchronization with the pinning agent, seeking to achieve predefined group consistency;
- e fk,i denotes the frequency control error of the droop control distributed power agent i
- e Uk,i denotes the voltage control error of the droop control distributed power agent i
- ⁇ f n,i denotes the droop control distributed power agent i
- the correction amount of the frequency in the secondary control, ⁇ U n,i represents the correction amount of the voltage of the distributed power source agent i in the secondary control;
- e Pk,i represents the active power control error of the constant power control distributed power agent i
- e Qk,i represents the reactive power control error of the constant power control distributed power agent i
- ⁇ P ref,i represents the constant power control distribution
- ⁇ Q ref, i represents the correction amount of the reactive power of the distributed power source agent i in the secondary control
- the k-th droop control controls the pinning control of the agent i in the distributed power cluster:
- e fUk,i Representing a set of agents adjacent to agent i in the kth distributed power cluster at time t m , Indicates the communication coupling coefficient between agent i and other agents in the cluster at time t m . If there is a communication line connection, otherwise, e fk,j represents the frequency control error of the droop control distributed power agent j, Representing a set of agents adjacent to the agent i in the lth distributed power cluster at time t m ; Indicates the communication coupling coefficient between agent i and the agents in other clusters at time t m .
- the step 40) specifically includes: each distributed power agent adjusts the output power based on the predefined power group consistency value based on the distributed power supply of the constant power control, and the distributed power recovery system frequency based on the droop control And voltage, together to complete the secondary control of the microgrid group;
- Represents a distributed power droop control agent i by the secondary control reference value of the frequency adjustment, f n, i represents the reference value of the distributed power droop control agent i in the primary frequency control, ⁇ f n, i denotes a distributed power supply droop control
- the amount of correction of the frequency of the agent i in the secondary control Denotes the reference value of the voltage that the distributed power agent i adjusts by the secondary control
- U n,i denotes the reference value of the droop control distributed power agent i in one control
- ⁇ U n,i denotes the droop control distributed power
- P ref, i represents the initial active reference value of the constant power control distributed power agent i
- ⁇ P ref, i represents the constant power control distributed
- the correction amount of the active power of the power agent i in the secondary control Represents the reactive power reference value of the constant power control distributed power agent i adjusted by the secondary control
- Q ref, i represents the initial reactive power reference value of the constant power control distributed power agent i
- ⁇ Q ref, i represents constant power control
- the universal type of the present invention includes a micro power grid group distributed control method for constant power and droop control, and is applicable to a micro power grid group and a distributed power cluster, and can be in a system Control when disturbance occurs, restore system frequency and voltage, and maintain system stability.
- the embodiment of the present invention is based on the hierarchical control of primary control and secondary control, and adopts the concept of cluster to implement the control of the multi-agent system based on the control.
- the cloth control method eliminates the need of the central controller and the complex communication topology, reduces the number of controllers, and satisfies the requirements of distributed power plug and play.
- the control method proposed by the invention performs a group-based consistency process in a distributed power supply cluster and between clusters, controls the frequency and voltage of the distributed power supply cluster cooperative recovery system, and the constant power control distributed power supply cluster cooperatively shares the power shortage. It can realize global coordination and local autonomy of distributed power clusters, and improve the reliability and adaptability of microgrid groups.
- the method of the invention can realize global coordinated control and local autonomous control of the micro grid group and the distributed power cluster, and includes two control modes of constant power control and droop control, which is a general-purpose method.
- Figure 1 is a flow chart of the present invention
- FIG. 2 is a schematic structural diagram of a microgrid group simulation system in an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a topology of a microgrid group communication in an embodiment of the present invention.
- FIG. 4 is a control effect diagram of a simulation scenario 1 in an embodiment of the present invention.
- FIG. 5 is a control effect diagram of a simulation scenario 2 in an embodiment of the present invention.
- FIG. 6 is a control effect diagram of the simulation scene 3 in the embodiment of the present invention.
- the micro-grid group includes m droop-controlled distributed power clusters and n constant-power controlled distributed power clusters; the distributed power control in the micro-grid group and the mutual information interaction between them
- the agent system is responsible for each distributed power source corresponding to an agent, the number of the distributed power source is the same as the number of the agent corresponding to the distributed power source; wherein, some of the agents are controlled by the pinning agent, and the remaining agents are through the agent Communication coupling, tracking synchronization in a distributed manner.
- a general-purpose distributed control method for a micro-grid group including constant power and droop control includes the following steps:
- Step 10 Perform a control to maintain the power balance of the microgrid group.
- the step 10) specifically includes: in the island mode, when the microgrid group is disturbed, the distribution of the droop control
- the power supply cluster automatically performs the primary control as shown in equation (1), and the distributed power supply of the droop control operates in the peer-to-peer control mode to maintain the power balance of the micro-grid group:
- f i represents the frequency of the i-th droop controlled distributed power source
- f n,i represents the initial value of the distributed power frequency of the i-th droop control
- m P,i represents the distributed power of the i-th droop control Active droop coefficient
- P i represents the active power of the distributed power output of the i-th droop control
- P 0,i represents the initial value of the active power of the distributed power supply of the i-th droop control
- U i represents the i-th droop control voltage distributed power
- U n, i denotes an i-th reference voltage distributed power droop control
- n Q, i represents the i th coefficient reactive droop droop control of distributed power sources
- Q i denotes The reactive power output of the distributed power supply of the droop control
- Q 0,i represents the initial value of the reactive power of the distributed power supply of the i-th d
- Step 20 Determine a predefined group consistency convergence value of the pinning agent.
- the step 20) specifically includes: determining, under an uncertain communication topology, a predefined group consistency convergence value of the pinning agent, including a pinning agent pre-defined group consistency value based on the droop control and a pinning agent pre-based based on constant power control Define group consistency values;
- the active preset group consistency value of the kth droop-controlled distributed power cluster Represents the active deficit in the entire microgrid group, ⁇ k, D represents the total number of non-zero participation factors in the kth droop control distributed power cluster, Representing the k-th reactive preset group consistency value based on the droop control distributed power cluster, Represents the lack of power in the entire microgrid group, Representing the kth frequency preset group consistency value based on the droop control distributed power cluster, Indicates the voltage pre-group consistency value of the kth droop-controlled distributed power cluster, m P,i represents the active droop coefficient, and n Q,i represents the reactive droop coefficient;
- Step 30 The agent other than the agent is seeking group consistency through the communication coupling and the pinning agent.
- the step 30) specifically includes: through the pinning control, synchronizing the other agents in the distributed power cluster with the other agents in the cluster, and seeking to achieve predefined group consistency;
- e fk,i denotes the frequency control error of the droop control distributed power agent i
- e Uk,i denotes the voltage control error of the droop control distributed power agent i
- ⁇ f n,i denotes the droop control distributed power agent i
- the correction amount of the frequency in the secondary control, ⁇ U n,i represents the correction amount of the voltage of the distributed power source agent i in the secondary control;
- e Pk,i represents the active power control error of the constant power control distributed power agent i
- e Qk,i represents the reactive power control error of the constant power control distributed power agent i
- ⁇ P ref,i represents the constant power control distribution
- ⁇ Q ref, i represents the correction amount of the reactive power of the distributed power source agent i in the secondary control
- the k-th droop control controls the pinning control of the agent i in the distributed power cluster:
- e fUk,i Representing a set of agents adjacent to agent i in the kth distributed power cluster at time t m , Indicates the communication coupling coefficient between agent i and other agents in the cluster at time t m . If there is a communication line connection, otherwise, e fk,j represents the frequency control error of the droop control distributed power agent j, Representing a set of agents adjacent to the agent i in the lth distributed power cluster at time t m ; Indicates the communication coupling coefficient between agent i and the agents in other clusters at time t m .
- Step 40 Adjust the output power to complete the secondary control.
- the step 40) specifically includes: each distributed power agent is based on the predefined predefined group consistency value, based on the constant
- the power control distributed power supply adjusts the output power, and the distributed power supply based on the droop control restores the system frequency and voltage to jointly complete the secondary control of the micro grid group;
- f n,i denotes the reference value of the droop control distributed power agent i in the frequency of one control
- ⁇ f n,i denotes the droop control distributed power source
- U n,i denotes the reference value of the droop control distributed power agent i in one control
- ⁇ U n,i denotes the droop control distributed power
- P ref, i represents the initial active reference value of the constant power control distributed power agent i
- ⁇ P ref, i represents the constant power control distributed
- the correction amount of the active power of the power agent i in the secondary control Represents the reactive power reference value of the constant power control distributed power agent i adjusted by the secondary control
- Q ref, i represents the initial reactive power reference value of the constant power control distributed power agent i
- ⁇ Q ref, i represents constant power control
- the control method of the present invention is directed to a microgrid group and a distributed power cluster, and based on the hierarchical control of primary control and secondary control, adopts the concept of cluster to implement the containment control based on the multi-agent system.
- the distribution-based group consistency process in the distributed power cluster and between the clusters drooping controls the frequency and voltage of the distributed power cluster cooperative recovery system, and the constant power control distributed power cluster cooperatively shares the power shortage, enabling distributed power clusters Global coordination and local autonomy reduce the number of controllers and complex communication topologies, improving the reliability and adaptability of the microgrid group.
- FIG. 2 is a schematic structural diagram of a micro grid group used in the embodiment.
- the simulation model consists of 10 distributed power supplies (referred to as DG) and 5 load cells (Load1, Load2, Load3, Load4, Load5). Each distributed power supply is connected to the 0.4kV low-voltage distribution network by power electronic components.
- the system has two constant power control distributed power clusters and one droop control distributed power cluster, corresponding to microgrid 1, microgrid 2 and microgrid 3.
- Agents There are 10 distributed power agents (Agents), which are represented by A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, respectively, where A4 is constant
- A5 is the pinning agent of the constant power control cluster 2
- A8 is the pinning agent of the droop control cluster 3.
- An agent can only communicate with its agents that are directly adjacent to the communication topology.
- PSCAD/EMTDC power system/DC electromagnetic transient simulation
- the simulation micro-grid model is built, and the multi-agent system is simulated in the matrix laboratory (MATLAB), and the multi-agent system is established based on the control group.
- the micro-grid group distributed control algorithm program uses the user-defined interface (UDI) model in PSACD to jointly run the algorithm in MATLAB with the computer-aided design (PSCAD) model of power system to realize the joint simulation technology. Simulation verification of the control method of the present invention.
- UMI user-defined interface
- PSCAD computer-aided design
- the simulation of the disturbance of the microgrid group in the island mode is carried out to verify the control effect of the method of the invention.
- A1 to A7 work in the PQ control mode
- A8 to A10 work in the Droop control mode.
- This embodiment sets three simulation scenarios:
- the first scenario is that the microgrid group is switched from the grid-connected mode to the island mode.
- Each microgrid operates independently, and the distributed power supply with droop control maintains the power balance of the microgrid through one control.
- the power coordination of the microgrid group is first converted into the pre-defined consistency value of the distributed power cluster by the global coordination of the distributed power cluster containment control; then the agents in each distributed power cluster seek and The agent tracking synchronization is achieved to achieve a predefined group consistency value; finally, the distributed power cluster adjusts the output power according to the predefined group consistency value.
- the simulation results are shown in Figure 4.
- Fig. 4(a) shows the active power variation of each distributed power source in the microgrid 1
- Fig. 4(b) shows the reactive power variation of each distributed power source in the microgrid 1
- Fig. 4(c) shows the distributed in the microgrid 1
- FIG. 4(d) shows the frequency change of the microgrid 1. It can be seen from Fig. 4(a) to Fig. 4(d) that the constant power control microgrid 1 can maintain power balance in the island mode and basically restore the distributed power supply voltage and system frequency.
- Fig. 4(e) shows the active power variation of each distributed power source in the microgrid 2
- Fig. 4(f) shows the reactive power variation of each distributed power source in the microgrid 2
- Fig. 4(e) shows the active power variation of each distributed power source in the microgrid 2
- Fig. 4(f) shows the reactive power variation of each distributed power source in the microgrid 2
- Fig. 4(e) shows the active power variation of
- FIG. 4(g) shows the distributed in the microgrid 2
- the power supply voltage changes
- FIG. 4(h) shows the frequency change of the microgrid 2.
- the constant power control microgrid 2 can maintain power balance in the island mode and basically restore the distributed power supply voltage and system frequency.
- Fig. 4(i) shows the active power variation of each distributed power source in the microgrid 3
- Fig. 4(j) shows the reactive power variation of each distributed power source in the microgrid 3
- Fig. 4(k) shows the distributed in the microgrid 3
- the power supply voltage changes
- FIG. 4(l) shows the frequency variation of the microgrid 3.
- the droop control microgrid 3 can maintain power balance in the island mode, and substantially restore the distributed power supply voltage and system frequency.
- Scenario 2 is for local autonomous control to eliminate local disturbances.
- the microgrid group operates in the island mode.
- the corresponding output power is changed, while the micro grid 2 and the micro grid 3 remain unchanged, and the simulation results are shown in Fig. 5.
- Fig. 5(a) shows the active power variation of each distributed power source in the island microgrid 1
- Fig. 5(b) shows the reactive power variation of each distributed power source in the island microgrid
- Fig. 5(c) shows the island microgrid
- Fig. 5(d) shows the frequency variation of the island microgrid 1.
- the distributed power sources can coordinately adjust the output power to keep the system frequency substantially unchanged.
- Scenario 3 is for uncertain communication topology changes.
- the microgrid group operates in island mode.
- the predefined group of the microgrid 1 The consistency value changes, A1 and A2 track the synchronization pinning agent A4 in a distributed manner, increase the output power to maintain the power balance, and restore the system voltage and frequency.
- the simulation results are shown in Fig. 6.
- Fig. 6(a) shows the active power variation of each distributed power source in the island microgrid 1
- Fig. 6(b) shows the reactive power variation of each distributed power source in the island microgrid 1
- FIG. 6(c) shows the island microgrid
- the voltage variation of each distributed power source in Fig. 6 (d) shows the frequency variation of the island microgrid 1. It can be seen from Fig. 6 that after the DG3 is removed in the microgrid 1, the remaining distributed power sources can cooperate to reduce the power reduced by the DG3 cutoff, so that the system frequency remains unchanged.
- the microgrid group can perform effective distributed cooperative control, and each distributed power cluster maintains power balance of the system and restores system frequency through primary control and secondary control. And voltage, indicating that the method proposed by the present invention has a good control effect.
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Claims (5)
- 一种通用型包含恒功率和下垂控制的微电网群分布式控制方法,其特征在于,所述微电网群包含m个下垂控制的分布式电源集群和n个恒功率控制的分布式电源集群;微电网群中分布式电源的控制及相互间的信息交互由多代理体***负责,每个分布式电源对应一个代理,分布式电源的编号和与该分布式电源对应的代理的编号相同;其中,一部分代理是被控制的牵制代理,其余代理通过与牵制代理的通信耦合,以分布的方式跟踪同步;所述控制方法包括以下步骤:步骤10)进行一次控制,维持微电网群的功率平衡;步骤20)确定牵制代理的预定义群一致性收敛值;步骤30)牵制代理以外的其他代理通过通信耦合与牵制代理寻求群一致性;步骤40)调整输出功率,完成二次控制。
- 按照权利要求1所述的通用型包含恒功率和下垂控制的微电网群分布式控制方法,其特征在于,所述的步骤10)具体包括:在孤岛模式下,当微电网群发生扰动时,下垂控制的分布式电源集群自动进行如式(1)所示的一次控制,下垂控制的分布式电源运行在对等控制模式,维持微电网群的功率平衡:式中,fi表示第i个下垂控制的分布式电源的频率,fn,i表示第i个下垂控制的分布式电源频率初始值,mP,i表示第i个下垂控制的分布式电源的有功下垂系数,Pi表示第i个下垂控制的分布式电源输出的有功功率,P0,i表示第i个下垂控制的分布式电源的有功功率初始值,Ui表示第i个下垂控制的分布式电源的电压;Un,i表示第i个下垂控制的分布式电源电压的参考值;nQ,i表示第i个下垂控制的分布式电源的无功下垂系数;Qi表示第i个下垂控制的分布式电源输出的无功功率;Q0,i表示第i个下垂控制的分布式电源的无功功率初始值。
- 按照权利要求1所述的通用型包含恒功率和下垂控制的微电网群分布式控制方法,其特征在于,所述的步骤20)具体包括:在不确定通信拓扑下,确定牵制代理的预定义群一致性收敛值,包括基于下垂控制的牵制代理预定义群一致性值以及基于恒功率控制的牵制代理预定义群一致性值;根据式(2)确定下垂控制分布式电源集群的分配系数:其中,表示第k个下垂控制分布式电源集群的有功分配系数;ωk,D,i表示第k个下垂控制分布式电源集群中代理i的参与因子,如果与代理i对应的分布式电源参与二次控制,则ωk,D,i=1,否则ωk,D,i=0;表示第k个下垂控制分布式电源集群中代理i的有功容量,ωk,PQ,i表示第k个恒功率控制分布式电源集群中代理i的参与因子,如果与代理i对应的的分布式电源参与二次控制,则ωk,PQ,i=1,否则ωk,PQ,i=0;表示第k个恒功率控制分布式电源集群中代理i的有功容量,表示第k个下垂控制分布式电源集群的无功分配系数,表示第k个下垂控制分布式电源集群中代理i的无功容量,表示第k个恒功率控制分布式电源集群中代理i的无功容量;根据式(3)确定恒功率控制分布式电源集群的分配系数:其中,表示第k个恒功率控制分布式电源集群的有功分配系数;ωk,PQ,i表示第k个恒功率控制分布式电源集群中代理i的参与因子,如果该分布式电源参与二次控制,则ωk,PQ,i=1,否则ωk,PQ,i=0;表示第k个恒功率控制分布式电源集群中代理i的有功容量,表示第k个恒功率控制分布式电源集群的无功分配系数,表示第k个恒功率控制分布式电源集群中代理i的无功容量;根据式(4)确定基于下垂控制的牵制代理预定义的群一致性值:式中,表示第k个基于下垂控制分布式电源集群的有功预设群一致性值,表示整个微电网群中有功缺额,ηk,D表示第k个下垂控制分布式电源集群中非零参与因子的总数,表示第k个基于下垂控制分布式电源集群的无功预设群一致性值,表示整个微电网群中无功缺额,表示第k个基于下垂控制分布式电源集群的频率预设群一致性值,表示第k个基于下垂控制分布式电源集群的电压预设群一致性值,mP,i表示有功下垂系数,nQ,i表示无功下垂系数;根据式(5)确定基于恒功率控制的牵制代理预定义的群一致性值:
- 按照权利要求1所述的通用型包含恒功率和下垂控制的微电网群分布式控制方法,其特征在于,所述的步骤30)具体包括:通过牵制控制,使分布式电源集群内与集群间的其他代理同牵制代理跟踪同步,寻求达到预定义的群一致性;按照式(6)确定下垂控制分布式电源代理i的控制误差efUk,i:式中,efk,i表示下垂控制分布式电源代理i的频率控制误差,eUk,i表示下垂控制分布式电源代理i的电压控制误差,Δfn,i表示下垂控制分布式电源代理i在二次控制中频率的修正量,ΔUn,i表示下垂控制分布式电源代理i在二次控制中电压的修正量;按照式(7)确定恒功率控制分布式电源代理i的控制误差ePQk,i:其中,ePk,i表示恒功率控制分布式电源代理i的有功功率控制误差,eQk,i表示恒功率控制分布式电源代理i的无功功率控制误差,ΔPref,i表示恒功率控制分布式电源代理i在二次控制中有功功率的修正量,ΔQref,i表示恒功率控制分布式电源代理i在二次控制中无功功率的修正量;通过式(8)进行第k个下垂控制分布式电源集群中代理i的牵制控制:式中,表示对efUk,i进行求导,表示tm时刻第k个分布式电源集群中与代理i相邻的代理的集合,表示在tm时刻代理i和该集群内的其他代理之间的通信耦合系数,若存在通信线路连接,否则,efk,j表示下垂控制分布式电源代理j的频率控制误差,表示tm时刻第l个分布式电源集群中与代理i相邻的代理的集合;表示在tm时刻代理i和其他集群中的代理之间的通信耦合系数,若存在通信 线路连接,否则,表示在tm时刻代理i的牵制控制增益, 表示没有针对代理i的牵制控制;eUk,j表示下垂控制分布式电源代理j的电压控制误差;通过式(9)进行第k个恒功率控制分布式电源集群中代理i的牵制控制:
- 按照权利要求1所述的通用型包含恒功率和下垂控制的微电网群分布式控制方法,其特征在于,所述的步骤40)具体包括:各分布式电源代理根据达到的预定义群一致性值,基于恒功率控制的分布式电源调整输出功率,基于下垂控制的分布式电源恢复***频率和电压,共同完成微电网群的二次控制;按照式(10)进行下垂控制分布式电源代理i的二次控制:式中,表示下垂控制分布式电源代理i通过二次控制调整的频率的参考值,fn,i表示下垂控制分布式电源代理i在一次控制中频率的参考值,Δfn,i表示下垂控制分布式电源代理i在二次控制中频率的修正量,表示下垂控制分布式电源代理i通过二次控制调整的电压的参考值,Un,i表示下垂控制分布式电源代理i在一次控制中电压的参考值,ΔUn,i表示下垂控制分布式电源代理i在二次控制中电压的修正量;按照式(11)进行恒功率控制分布式电源代理i的二次控制:
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