WO2016078329A1 - 一种多智能体结构的微电网优化运行方法 - Google Patents
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Definitions
- the invention relates to the field of power systems, in particular to a micro-grid optimization operation method of a multi-agent structure.
- MAS Multi-Agent Systems
- the micro-grid optimization operation using the MAS structure is aimed at the minimum cost based on the power generation, operation and maintenance costs of the network equipment or the cost of purchasing electricity from the main network [2], and the internal self-voluntary cooperation mode through the various agents (Agent) The full cooperation method for division of labor and cooperation.
- This type of operation mode is simple and practical in the case of single property rights in the microgrid.
- the microgrid marketization when there are different investment entities in the microgrid, such as the microgrid composed of many hotels, this type of operation cannot solve the problem of internal benefit distribution of the microgrid.
- each DER in the microgrid is allowed to have its own goals and interests, and can participate in the operation of the microgrid in an intentional way. At this time, voluntary collaboration is only a special case of interaction between agents.
- the bidding method and the microgrid control method can realize the decentralized decision of distributed power supply through the formulation of power generation bidding, and can also achieve centralized control by price coordination management. Due to the characteristics of the distributed power supply and the microgrid itself, the existing research results of the conventional power market cannot be simply transplanted into the microgrid, mainly in the following two aspects:
- the distributed bidding function is added on the basis of the existing operation control of the microgrid, the interests of each microgrid participant are reflected by the market means, and the microgrid optimization operation is guided; the artificial immune system is utilized in the bidding process ( Artificial Immune systems (AIS)'s adaptive and defect tolerance capabilities deal with the uncertainty caused by intermittent power supplies; and through the co-evolution process of the technology, improve the coordination of the entire microgrid MAS.
- Artificial Immune systems (AIS)'s adaptive and defect tolerance capabilities deal with the uncertainty caused by intermittent power supplies; and through the co-evolution process of the technology, improve the coordination of the entire microgrid MAS.
- the invention provides a micro-grid optimization operation method with multi-agent structure, and the invention can solve the problem that the existing operation mode cannot realize the internal benefit distribution of the micro-grid when the equipment property rights in the micro-grid are not uniform or involve the public micro-grid. .
- the method guides the optimization operation of the microgrid through the market mechanism of bidding. The specific process is described below:
- a micro-grid optimization operation method of a multi-agent structure comprising the following steps:
- microgrid distributed power source adopts unit bidding to realize quotation function; bid management agent assists in completing negotiation and optimization of each unit in microgrid;
- the bidding management agent sends the bidding results of each unit to the microgrid control system, and the microgrid control system performs the optimal operation of the microgrid based on the results of the bidding negotiation.
- the steps of the micro power grid distributed power source adopting the unit bidding to realize the quotation function are specifically:
- the affinity formula of the artificial immune algorithm is determined to form an artificial immune quotation environment antigen
- the antibody that meets the interests of the distributed power source is obtained, and the antibody is decoded to obtain the bidding scheme of the distributed power source, and submitted to the bid management agent.
- the steps of the bid management agent to assist in completing the negotiation and optimization of each unit in the micro grid are as follows:
- the objective function based on the distributed power supply itself bidding determines the affinity formula of the artificial immune algorithm, and the specific steps for forming the artificial immune quotation environment antigen are:
- the distributed power source owner determines the quotation form and the target letter of its own bid based on the bidding model of the micro grid. number;
- the bidding unit agent determines the antigenic representation of the artificial immune algorithm based on the characteristics of the distributed power source
- the bidding unit agent determines the antibody of the artificial immune algorithm and the encoding and decoding formula of the antibody based on the quotation form of the distributed power source;
- the bidding unit agent determines the affinity formula of the artificial immune algorithm based on the objective function of the distributed power source itself bidding;
- the bidding unit agent processes the collected information to form an artificial immune quotation environment antigen.
- the antigenic expression of the artificial immune algorithm includes the following three parts of information:
- the judgment condition is: the specified number of times is reached, and/or the clearing price in the micro grid does not change any more.
- the composition of the micro-grid may belong to different owners, and it is inevitable to optimize operation and control based on economic means such as bidding.
- the invention can solve the problem that when the equipment property rights in the micro grid are not uniform, or the public micro grid is involved, the existing operation mode cannot distribute the internal benefits of the micro grid, and the realization of the commercial operation of the micro grid is facilitated.
- the present invention adopts MAS's bid optimization operation and control, reflects the interests of each micro-grid participant through market means, and uses the bidding result to guide the micro-grid optimization, which is in line with the characteristics of micro-grid stratification and distributed control.
- the programmable controller embedded in the algorithm according to the MAS standard in the manufacturing controller can realize “plug and play” and directly participate in the system bid optimization operation.
- Figure 2 is a schematic diagram of the implementation time process of the microgrid optimization operation
- FIG. 5 is a flow chart of an optimization algorithm based on artificial immunity of a bidding single agent provided by the present invention
- FIG. 6 is a form of bid feedback provided by an exemplary embodiment of the present invention.
- Figure 8 is an example of a microgrid structure
- Figure 9 is a graph showing the trend of the affinity of antibody collection during an agent bidding process
- Figure 10 is a demonstration of the clearance price of the microgrid for multiple coordination during the bidding period
- Figure 11 shows the evolutionary algebraic distribution of the auction unit Agent for 5000 times
- Figure 12 shows the coordinated evolutionary algebraic distribution of the microgrid solved 100 times to reach the Nash equilibrium.
- the example provides a micro-grid optimization operation method of multi-agent structure, see FIG. 1 to FIG. 12, which are described in detail below:
- micro-grid optimization architecture based on distributed power bidding in the embodiment is shown in Figure 1. It mainly involves three types of agents: micro-grid optimization control, bidding management, and bidding unit, which have the following characteristics.
- Microgrid optimization control agent The agent sends the current microgrid operation status to the bid management agent, and receives the power generation and load energy balance information returned by the bid management agent.
- the microgrid optimization control agent also includes monitoring the voltage, power quality and frequency of the microgrid.
- the micro-grid optimization control agent under special circumstances (such as an accident in the large power grid, the micro-grid is switched from grid-connected to independent operation), the direct control method is used to carry out the load in the micro-grid and the distributed power generation output management. At this time, the bid management is ignored. Agent returns information.
- Bidding management agent This agent is a function of assisting the micro-grid optimization control agent to complete the economic distribution of power generation in the micro-grid, and represents the public network purchasing/selling price of all loads and DER unit agents in the micro-grid on the main network. It also manages the bidding information of the bidding unit Agents in the microgrid. The bidding interval is consistent with the bidding time of the connected grid, usually in a period of 15 minutes.
- the main functions of the Agent include: obtaining the bidding price of each DER, judging whether the negotiation is completed, the bidding information is filed, and the unit operation plan is obtained.
- the bidding unit Agent mainly the DER unit, and may include the load unit Agent under certain circumstances.
- the DER unit Agent is used to provide power to the energy source unit of the microgrid, such as a typical distributed energy source such as photovoltaic cells, wind turbines, fuel cells, micro turbines, and the like.
- the DER unit agent submits a power generation bid request to the bid management agent based on local measurement information and communication information with other agents, and the time is 15 minutes.
- the load unit is mainly for loads such as residential, commercial or industrial requirements in the microgrid, like the DER unit, negative
- the unit can submit the expected amount of electricity and the highest and lowest price it is willing to pay.
- the bid time is also 15 minutes, but does not participate in the auction.
- Energy storage equipment can be regarded as power supply or load equipment. When discharging, it can be quoted according to DER. When charging, bid according to load.
- the functions of the agent include: forming an antigen based on the published information, obtaining a bidding strategy through an artificial intelligence method, and submitting a bidding strategy.
- the solution and implementation of the above bidding function of the microgrid is carried out by relying on the co-evolution of MAS and the adaptability and powerful search capability of the single control algorithm.
- the general technology of the MAS system can be adopted, and the micro-grid bidding management agent collects the bidding information of each bidding agent through the inquiry method, and issues information through the blackboard system.
- micro-grid bidding optimization operation control is: based on the research results of the existing MAS microgrid control system, the bidding agent function is added to the system, and transmitted to the control agent to apply the bidding result to guide the optimization operation.
- the microgrid includes independent and grid-connected. In the grid-connected microgrid mode, the implementation time of the microgrid optimization operation is shown in Figure 2.
- the main processes include the following:
- the next period (1) connected to the main network to obtain micro grid sold to a user and the distributed power P buy electricity tariff repurchase P sell.
- each DER in the micro-grid considers its own economic benefits and conducts optimization calculation based on bidding for microgrid.
- the distributed power supply of the microgrid adopts the unit bidding agent to realize its own quotation function; the bid management agent assists in the negotiation and optimization of each bidding unit in the micro grid.
- the bidding management agent sends the bidding result of each agent to the running agent, and the micro grid records the result based on the bidding negotiation and guides the microgrid optimization operation.
- the key of this technology is the adaptive immune algorithm of single agent, and the realization of cooperative evolution of each agent based on this.
- the micro-grid bidding feedback and co-evolutionary scheme are shown in Figure 3.
- the technical idea is: the bidding unit DER is regarded as an agent with perceptual ability and rational thinking.
- the agent interacts with the submitted bidding information (antibody representation).
- the grid uses the bidding feedback provided by the bid management agent to realize the power supply and load in the micro grid and the power supply negotiation between the power sources.
- An artificial immune solution process of the bidding unit Agent is a bidding process.
- the antigenic form used by the bidding unit during the bidding process is shown in Figure 4.
- the DER bidding unit first uses the self-environment and main grid price information as the antigen to perform artificial immune antibody solution to obtain the bid; then the bid management agent collects the bidding information and publishes it to each bidding unit agent in the form of bidding feedback.
- the bidding unit agent generates a new antigen based on the feedback information and recalculates the bidding strategy. Through multiple rounds of feedback and negotiation, the final form of quotation is obtained.
- the number of feedbacks allowed in the above bidding process determines the number of co-evolution of artificial immunity; the bidding of the microgrid The feedback determines the antigenic form of the artificial immune algorithm.
- Different types of bidding models will vary.
- the bidding feedback content received by the bidding unit may be the clearance price p cl or the bidding information of each bidding unit.
- the feedback information p cl needs to be analyzed and analyzed by the bidding management agent.
- the agent fails, the entire bidding function may collapse.
- the bidding feedback is the bidding information of each agent, the DER bidding unit needs a larger amount of calculation.
- the example uses the microgrid bidding process to allow multiple feedbacks (k is an integer greater than one), and the feedback is the quote for each bidding unit.
- Other types of market bidding environments can use the same method, the specific antigen form and the maximum allowable feedback times of the bidding process (allowing the number of negotiations), and have no effect on the application of the method.
- the auction feedback information in the method is the only way and content of the interaction between the agents.
- the bid information of each bidding unit agent is used.
- the initial value of the bidding information may be a real operating cost reflection, or may be a bidding information formulated through a strategy.
- the optimal value obtained based on the artificial immune algorithm under the guidance of the set affinity is dynamic.
- the bidding unit agent is based on the artificial immune algorithm flow, as shown in FIG. 5, and the following steps are specifically implemented.
- the distributed power source owner determines the form of the offer and the objective function of the own bid based on the bidding model of the microgrid.
- each DER bidding unit in the microgrid can use the quotation form of reporting four parameters [b i , c i , Q imin , Q imax ], and the price function and power limit form are:
- B i (Q i ) is the bid price of the DER based on the generating capacity
- b i and c i are the coefficients of the online bid of the i-th DER, and the bid directly determines whether the DER can win the bid and the amount of power generated by the bid.
- Q imin and Q imax describe the maximum and minimum power generation during this time period, determined by distributed power unit characteristics and environmental factors.
- the objective function ⁇ i (b i , c i ) of the distributed power bid is determined by the bidding method adopted by each distributed power source.
- the bidding unit agent determines the antigenic representation of the artificial immune algorithm based on the characteristics of the distributed power source device.
- the antigen model of each DER bidding unit may include three parts, (a) the environmental information of the bidding equipment itself, which is private information, and different equipments pay different attention, such as the micro-combustion machine pays attention to the natural gas price, and the solar power intensity in the time period of photovoltaic power generation attention The fan pays attention to the wind intensity during the time period. (b) During the optimized operation period, the price of electricity purchased by the microgrid from the main network and the price of electricity sold to the main network; (c) the quotation of other bidding unit agents, including the bidding coefficients b i and c of the distributed power source i , and the maximum and minimum power generation capacity.
- the submitted bid feedback form is shown in Figure 6. This part of the information can be obtained from the bid management agent or through the information exchange between the agents.
- the antibody represents the number of elements in the set n is the number of agents of the auction DER.
- the environmental factors (antigen part 1) and their own technical parameters of each bidding DER determine the power generation cost, and the time period Q imin and Q imax ;
- the market purchase price P buy and P sell (antigen part 2) determine the micro grid The upper and lower limits of the internal clearing price p cl ;
- the bidding unit Agent's own quotation and bidding feedback information (antigen part 3) determine the clearing price P cl value of the micro grid, which is the core of the micro grid bidding, which is related to The interests of the various participants in the microgrid.
- the interaction of information between agents is realized through the submission of bids, and is announced to other bidding agents in the form of bid feedback.
- the bidding unit agent determines the antibody of the artificial immune algorithm and the encoding and decoding of the antibody based on the quotation form of the distributed power source.
- the operation process of the artificial immune algorithm is not directly operated on the actual decision variable (power generation quotation) of the problem solved, but the cloning, mutation and selection of the individual codes representing the feasible solution, and the optimization is achieved by this immune method.
- the bidding form of the bidding DER contains four parameters, [b i , c i , Q imin , Q imax ], and the antibody of the artificial immune algorithm forms a spatial correspondence relationship with the above four parameters through encoding and decoding.
- an antibody as described includes only two b i and c i gene elements
- the coding of the antibody is also two genetic elements for b i and c i .
- the antibody coding of the exemplary example adopts the Gray code coding method, and its main advantage is that the change of adjacent values conforms to the principle of minimum character set coding, which is convenient for improving the local search capability of the AIS method.
- the bidding unit agent determines the affinity formula of the artificial immune algorithm based on the objective function of the distributed power supply itself bidding.
- the affinity of the antigen and the antibody reflects the bidding target and the profit of the bidding unit, and the affinity of the antibody and the antigen determines the pros and cons of the antibody, and the calculation of the affinity is determined by the bidding method adopted by each distributed power source.
- the Agent is based on antigen and matures by increasing the affinity.
- an antibody Ab can be formed and corresponds to a gain ⁇ i (b i , c i ), and the size of the gain determines the affinity of the antibody.
- the affinity is considered to be the highest.
- the bidding unit Agent Based on the antigen expression form of step 402, the bidding unit Agent processes the collected information to form an artificially immunized environmental antigen.
- the auction feedback information in the method is the only way and content of the interaction between the agents.
- the bid information of each bidding unit agent is used.
- the initial value of the bidding information may be a real operating cost reflection, or may be a bidding information formulated through a strategy.
- the optimal value obtained based on the artificial immune algorithm under the guidance of the set affinity is dynamic.
- the unit bidding agent is based on the quotation environment antigen, and is solved by an artificial immune algorithm to obtain an antibody that conforms to the interests of the distributed power source, and the antibody is decoded to obtain the bidding scheme of the distributed power source, and submitted to the bid management agent.
- each bidding process is an immunization process.
- the bidding process can use various intelligent algorithms with adaptive, including but not limited to artificial immune algorithms, genetic algorithms and other intelligent algorithms.
- the bidding unit Agent cooperatively evolves and performs steps 405 and 406.
- the bidding management agent assists the bidding unit agent in the micro-grid to achieve negotiation and optimization by collecting and sending bidding information.
- the specific implementation steps include:
- 502 Wait and accept bid information submitted by each bidding unit agent in the micro grid.
- the judgment conditions include two types: (a) reaching the specified number of consultations; (b) the clearance power price in the micro grid does not change after the negotiation.
- microgrid negotiation bid allowed to be based on the number of max bid market rules microgrid determined, in the case of allowing multiple negotiations, preferably an integer of 3 to 10.
- step 505 If it is judged that the negotiation is completed, the process proceeds to step 501, and the bidding unit agent in the micro power grid is negotiated by repeating the bidding manner.
- the application of this method is mainly considered.
- the microgrid adopts a centralized and distributed hybrid control method, and adopts a release form with higher efficiency. If there is an information interaction channel between the bidding units, the participation of the bid management agent is not required, and the information interaction between the bidding unit agents can be realized.
- the artificial immune algorithm is a parallel optimization calculation process based on the biological immune mechanism.
- the above-mentioned various bidding unit agents only search for antigens in their own bidding space, and search through the antibody set and the gene pool, the process does not need central control. Assist, complete in parallel.
- the antigen of each bidding unit agent contains bidding feedback information (such as other antibody bidding information content or clearance price cl ) issued from the bidding management agent, so the antigen content is global.
- the micro-grid bidding process of AIS system based on co-evolution is shown in Fig. 7.
- the application demonstration is carried out for the commercial microgrid project shown in Figure 8 for the system structure.
- the microgrid is divided into three feeders, including two micro-combustion engines, two diesel engines, and four different types of distributed power sources such as solar photovoltaic solar energy.
- the reactive part does not need to be considered.
- the cost factors of each distributed power supply and the upper and lower limits of the power generation are shown in Table 1.
- the price of microgrid purchases and sales from the main network is 0.022$/kWh and 0.03$/kWh, respectively. Since the time period of each stage is fixed (15 min), the power in the micro grid can be used instead of the power. The active power demand of the three loads during this period is 130 kW, and the reactive power demand and influence are not considered in the micro grid.
- the various bidding unit agents in the micro-grid will achieve coordinated evolution. Since each part is based on its own private information, it will be based on other agent quotations, and the bid price will converge quickly to reach the Nash equilibrium state.
- the bid price convergence in the microgrid is shown in Figure 10.
- the microgrid agent can achieve the minimum power generation and transmission cost of the microgrid while maintaining the maximum utilization efficiency of photovoltaic and wind power generation.
- the bidding results are shown in Table 2.
- the artificial immune algorithm is a random algorithm.
- the running time of the system may be different.
- This method performs statistical analysis on the expected algebra of the optimal solution for a single agent.
- the system runs 5000 times on the micro-combustion engine Agent bidding process.
- the statistical results of the adaptive bidding scheme are shown in Fig. 11.
- the horizontal axis represents evolutionary algebra, and the vertical axis represents that the global optimal solution can be found after running to the corresponding evolutionary algebra. Number of times (frequency). It can be seen from the figure that the global optimal solution is found with high probability within 30 generations, and the average algebra of the optimal solution is found to be 13.5 generations.
- Figure 12 is a case where 100 microgrid co-evolutions are obtained to obtain an optimal result.
- the maximum expected number of Nash equilibrium prices based on bidding negotiation is 5 times. In order to save runtime, fewer feedbacks and negotiated times can be defined to complete the bidding within the microgrid.
- the invention runs on the basis of the antibody gene pool, and ensures rapid convergence and global optimization of the artificial immune bidding scheme.
- the bidding process is an iterative process. In practice, the anomalous events are far less than the normal events.
- the new antibodies generated during the initial response process have memory.
- the second response mechanism is used to quickly obtain the optimal bidding scheme. .
- each agent is running in parallel calculation, and the overall efficiency is high.
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Abstract
Description
Claims (6)
- 一种多智能体结构的微电网优化运行方法,其特征在于,所述方法包括以下步骤:(1)微电网获得连接主网下一时段出售给用户的电价Pbuy和分布式电源回购的电价Psell;(2)进行基于竞价的微电网优化运行计算;微电网分布式电源采用单元竞价实现报价功能;竞价管理智能体协助完成微电网内各单元的协商和优化;(3)竞价管理智能体将各单元发电量竞价结果发送给微电网控制系统,微电网控制系统基于竞价协商后的结果进行微电网的优化运行。
- 根据权利要求1所述的一种多智能体结构的微电网优化运行方法,其特征在于,所述微电网分布式电源采用单元竞价实现报价功能的步骤具体为:基于分布式电源自身竞价的目标函数,确定人工免疫算法的亲和度公式,形成人工免疫的报价环境抗原;通过对人工免疫算法进行求解,获得符合分布式电源自身利益的抗体,将抗体解码获得分布式电源的竞价方案,并提交给竞价管理智能体。
- 根据权利要求1所述的一种多智能体结构的微电网优化运行方法,其特征在于,所述竞价管理智能体协助完成微电网内各单元的协商和优化的步骤具体为:判断微电网内分布式电源和负荷之间是否达成平衡;如果是,则备案各竞价单元的竞价情况,并获得机组运行方案,提交给微电网控制系统;如果否,通过多次竞价方式使微电网内分布式电源和负荷之间达成平衡。
- 根据权利要求2所述的一种多智能体结构的微电网优化运行方法,其特征在于,所述基于分布式电源自身竞价的目标函数,确定人工免疫算法的亲和度公式,形成人工免疫的报价环境抗原具体步骤为:(1)分布式电源所有者基于微电网的竞价模型,确定报价形式,以及自身竞价的目标函数;(2)竞价单元智能体基于分布式电源自身特性,确定人工免疫算法的抗原表现形式;(3)竞价单元智能体基于分布式电源的报价形式,确定人工免疫算法的抗体,以及抗体的编码和解码公式;(4)竞价单元智能体基于分布式电源自身竞价的目标函数,确定人工免疫算法的亲 和度公式;(5)竞价单元智能体对收集到的信息进行加工,形成人工免疫的报价环境抗原。
- 根据权利要求4所述的一种多智能体结构的微电网优化运行方法,其特征在于,人工免疫算法的抗原表现形式包括以下三部分信息:(a)竞价设备自身的环境信息;(b)优化运行时间内,微电网从连接主网的购电价格以及出售给主网的售电价格;(c)其他单元竞价智能体t的报价信息。
- 根据权利要求3所述的一种多智能体结构的微电网优化运行方法,其特征在于,判断条件为:达到规定的次数,和/或微电网内的清仓电价不再变化。
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