CN108365627B - Wind storage isolated grid power supply system coordination control method based on flexible coordination factors - Google Patents
Wind storage isolated grid power supply system coordination control method based on flexible coordination factors Download PDFInfo
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- H02J3/386—
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a wind storage isolated network system coordination control method based on a flexible coordination factor, and belongs to the technical field of power grid operation and control. The method is characterized by comprising the following steps: firstly, acquiring operation parameters of a wind storage isolated network power supply system; establishing a coordination control mechanism of the wind storage isolated network power supply system; the interaction behavior between the upper layer coordination control intelligent agent and the lower layer unit distributed control intelligent agent is realized through direct and indirect actions; calculating a flexible coordination factor for power balance of the wind storage isolated network power supply system; the upper layer coordination control intelligent agent distributes the flexible coordination factors to the lower layer energy storage unit distributed control intelligent agent; fifthly, the energy storage inverter performs power control. The wind storage isolated network power supply system coordination control method based on the flexible coordination factor can realize coordination control of each unit in the wind storage isolated network system, ensures the stability of output voltage and frequency of the wind storage isolated network system, and provides technical basis and practical method for stable operation of the wind storage isolated network system.
Description
Technical Field
The invention relates to a coordination control method of a wind storage isolated network power supply system, in particular to a coordination control method of a wind storage isolated network power supply system based on a flexible coordination factor, and belongs to the technical field of power grid operation and control.
Background
In distributed energy power generation, wind power generation is the most mature technology, the most developed condition and the most promising development prospect. However, due to the limitation of the acceptance of a large power grid, the problems of grid connection difficulty, wind abandon and the like existing in the process of accessing wind power into the power grid on a large scale become a great problem restricting the development of the wind power. And aiming at the wind power grid-connected problem, experts at home and abroad propose a wind-storage combined power generation technology. With the reduction of the cost of the energy storage device and the maturity of the technology, the wind storage isolated grid power generation technology is used as an effective form of a wind storage combined power generation technology, can provide a flexible operation mode for new energy dispersion and small-scale application, and is gradually valued by researchers.
The core technology of the stable operation of the wind storage isolated network system is a coordination control strategy among fan output, the fan, an energy storage inverter and energy storage charging/discharging conversion. The wind power output power has the characteristics of fluctuation and intermittence under the influence of natural environment and climate change, and the system power and frequency easily fluctuate in a large range in the isolated operation process of wind power due to the absence of the support of a large power grid, so that the load requirement is difficult to meet. In the wind storage isolated network system, the access of the energy storage unit can provide an effective mode for solving the problems of power fluctuation, frequency stability and the like in the system caused by wind power fluctuation and load disturbance.
At present, the research on the combined operation of wind storage systems at home and abroad mainly focuses on the aspects of grid-connected positions, operation cost, stable operation, control strategies with different fault characteristics and the like, and the research on wind storage isolated network systems is relatively less. Some documents research the operation mode and planning configuration of an isolated microgrid such as a wind storage grid, and provide a configuration scheme and a typical network topology structure of the isolated microgrid; some documents apply the control mode of the traditional power grid to an isolated microgrid, and provide a master-slave control method and an equivalent control strategy of the isolated microgrid; and some research institutions establish an experimental system of an isolated microgrid, verify the feasibility of the wind storage isolated grid power supply system from multiple angles of physical simulation, computer simulation and the like, but are limited to a control method and a control strategy and are to be further improved so as to improve the practical level. The core problem of the stable operation of the wind storage isolated power supply system is as follows: after the large power grid support is lost, the system is required to recover a stable operation state by self regulation capacity under various external disturbance conditions. In a traditional control mode, power regulation depends on a large power grid, a micro-grid is insensitive to changes of external conditions, and the regulation capacity is limited. Under the control mode, the wind storage system is fragile in operation, the possibility of operation failure exists under severe conditions, the application has great limitation, the commercial operation of the wind storage system is not facilitated, and the practicability is poor.
The key point of the problem is how to track and respond to the requirement of the alternating current system on power balance and carry out coordination control. The complexity of the control lies in that, on one hand, the control strategy is adapted to the change of various operation conditions, such as the energy storage state, the output change of the fan, the system load change and the like, the operation conditions are different, the power characteristics required to be provided by the energy storage control are also different, and the characteristics are related to the operation state of the wind storage system. On the other hand, how to coordinate and intelligently decide each operation unit in the wind storage isolated network, what control mode is adopted to establish a coordination control mechanism, and flexible control is implemented, which is also a key problem for realizing stable operation of the wind storage isolated network system.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a coordination control method of a wind storage isolated network system based on a flexible coordination factor. The coordination control method comprehensively considers various power balance requirements and operation constraints in the wind storage isolated network system, can more effectively and reliably coordinate and control the wind storage isolated network system, and provides technical basis and a practical method for stable coordination operation of the wind storage isolated network system.
The basic idea of the flexible self-starting method of the wind storage isolated network system provided by the invention is as follows: based on a multi-intelligent technology, establishing a coordination control mechanism of the wind storage isolated network system; comprehensively considering various power balance requirements, and establishing a flexible coordination factor control scheme meeting system operation constraints; based on the control method, the reliability and the practicability of the wind storage isolated network power supply system are improved.
The technical scheme adopted by the invention is as follows:
in an isolated power supply system consisting of a wind turbine generator and an energy storage device, the balance power of an isolated network system is dynamically calculated on line, and power control parameters of each operation unit are dynamically adjusted by adopting a flexible coordination factor according to the operation conditions of the system, so that the coordinated control and stable operation of the wind storage isolated network system are realized. The method is characterized by comprising the following steps:
step 1) acquiring operation parameters of a wind storage isolated network power supply system;
step 2) establishing a coordination control mechanism of the wind storage isolated network power supply system;
(1) establishing an upper layer coordination control intelligent agent of a wind storage isolated network power supply system;
(2) establishing a wind storage isolated network power supply system lower layer unit distributed control intelligent agent;
(3) the interaction between the upper layer coordination control intelligent agent and the lower layer unit distributed control intelligent agent is realized through direct action;
(4) the interaction behavior between the lower-layer unit decentralized control agent and the upper-layer coordinated control agent is realized through indirect action;
step 3) calculating a flexible coordination factor for power balance of the wind storage isolated network power supply system;
(1) the upper layer coordination control intelligent body samples the active power of the lower layer unit intelligent body of the wind storage isolated network system;
(2) the upper layer coordination control agent calculates the balance power deviation;
(3) judging whether the balance power deviation is greater than a power coordination control threshold value, and if the balance power deviation is greater than the power coordination control threshold value, performing the step (4); otherwise, turning to the step (1);
(4) distributing the balance power deviation to each energy storage unit to obtain a flexible coordination factor;
step 4), the upper layer coordination control intelligent agent distributes the flexible coordination factors to the lower layer energy storage unit distributed control intelligent agent;
and 5) carrying out power control on the energy storage inverter.
The wind storage isolated grid power supply system is an independent alternating current power supply system consisting of a wind turbine generator and an energy storage system.
The operation parameters of the wind storage isolated network system are parameters required by grid calculation and control, such as active power and reactive power output by the wind turbine generator, the charge state of the energy storage system, the load power of the wind storage isolated network system, the alternating-current bus voltage, the frequency and the like.
The method comprises the steps that a coordination control mechanism of a wind storage isolated network power supply system is established, namely, in the wind storage isolated network system, coordination control among wind power, stored energy power and load power is carried out by adopting a multi-agent-based control technology;
establishing an upper-layer coordination control intelligent body of the wind storage isolated network power supply system refers to establishing an intelligent centralized control module of the wind storage isolated network system, realizing the functions of communication and data acquisition with a lower-layer unit distributed control intelligent body, analyzing and deciding according to the history and the current operating state of the system, and issuing a coordination control instruction to the lower-layer unit distributed control intelligent body;
the establishment of the lower-layer unit decentralized control intelligent agent of the wind storage isolated network power supply system refers to the addition of an independent intelligent control module in a wind generating set, an energy storage unit and a load, and the functions of data acquisition, power control, communication with an upper-layer coordinated control intelligent agent and the like of each decentralized unit are realized;
the upper layer coordination control intelligent agent calculates the power balance deviation, namely, the power balance deviation is calculated according to the following formula:
ΔP＝KLPLOAD-KWPW-PB-KFΔF
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; pLOADActive load power in a wind storage isolated grid power supply system; pWActive power of a wind turbine generator in a wind storage isolated grid power supply system is provided; kLThe load power is a load power adjusting parameter, and the value of the load power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; kWThe wind power is a wind power adjusting parameter, and the value of the wind power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; pBCharging and discharging power sum of an energy storage unit in the wind storage isolated network power supply system; Δ F is the system frequency deviation; kFAnd the unit regulating power of the wind storage isolated network power supply system is provided.
The balance power deviation is distributed to each energy storage unit to obtain the flexible coordination factor, namely the power distribution is carried out according to the following constraints:
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; delta PiThe power regulating quantity of the ith energy storage unit in the wind storage isolated network system is the flexible coordination factor of the distributed power; pBiInstantaneous power of the ith energy storage unit; pBi maxThe instantaneous charging or discharging power limit value of the ith energy storage unit.
Compared with the prior art, the invention has the beneficial effects that:
1. the wind storage isolated network power supply system coordination control method based on the flexible coordination factors can improve the operation reliability of the system. In the traditional control method, the energy storage system only implements constant frequency and constant voltage control, and the control method cannot be insensitive to the change of external conditions, and the control units lack coordination, so that the mismatching power in the operation process is larger, and the transient impact is also larger. The invention reduces the impact of unbalanced power and improves the reliability of system operation by coordinating control and flexible control factors.
2. The method is easy to implement. The method is based on the original wind storage isolated network control link, a coordinated control finger mechanism and logic are established, the calculation of flexible control factors is simple and effective, the parameters and data of the original control system are utilized to the maximum extent, and the method is easy to implement from the aspect of control.
3. The method is convenient for commercial development. With the increase of the application of the wind storage isolated network system, the development of the control strategy of the system has larger requirements, and the system has better commercial development prospect.
Drawings
FIG. 1 is a schematic diagram of a wind storage grid system;
FIG. 2 is a multi-agent control intent;
FIG. 3 is a schematic view of a wind storage isolated network system coordination control instruction flow chart based on a flexible coordination factor;
FIG. 4 is a simulation graph of active power loaded on an alternating current bus side of a wind storage isolated network system based on a flexible coordination factor.
FIG. 5 is a system alternating current side frequency simulation graph of a wind storage isolated network system based on a flexible coordination factor.
FIG. 6 is a simulation graph of an alternating current load side output three-phase current of a wind storage isolated network system based on a flexible coordination factor.
FIG. 7 is a simulation graph of an alternating current load side output three-phase voltage of a wind storage isolated network system based on a flexible coordination factor.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings and simulation experiments.
As shown in fig. 1 to 7, a wind storage isolated grid power supply system coordination control method based on a flexible coordination factor includes the following steps:
step 1) acquiring operation parameters of a wind storage isolated network power supply system;
step 2) establishing a coordination control mechanism of the wind storage isolated network power supply system;
(1) establishing an upper layer coordination control intelligent agent of a wind storage isolated network power supply system;
(2) establishing a wind storage isolated network power supply system lower layer unit distributed control intelligent agent;
(3) the interaction between the upper layer coordination control intelligent agent and the lower layer unit distributed control intelligent agent is realized through direct action;
(4) the interaction behavior between the lower-layer unit decentralized control agent and the upper-layer coordinated control agent is realized through indirect action;
step 3) calculating a flexible coordination factor for power balance of the wind storage isolated network power supply system;
(1) the upper layer coordination control intelligent body samples the active power of the lower layer unit intelligent body of the wind storage isolated network system;
(2) the upper layer coordination control agent calculates the balance power deviation;
(3) judging whether the balance power deviation is greater than a power coordination control threshold value, and if the balance power deviation is greater than the power coordination control threshold value, performing the step (4); otherwise, turning to the step (1);
(4) distributing the balance power deviation to each energy storage unit to obtain a flexible coordination factor;
step 4), the upper layer coordination control intelligent agent distributes the flexible coordination factors to the lower layer energy storage unit distributed control intelligent agent;
step 5), the energy storage inverter implements power control;
the wind storage isolated grid power supply system is an independent alternating current power supply system consisting of a wind turbine generator and an energy storage system.
The operation parameters of the wind storage isolated network system are parameters required by grid calculation and control, such as active power and reactive power output by the wind turbine generator, the charge state of the energy storage system, the load power of the wind storage isolated network system, the alternating-current bus voltage, the frequency and the like.
The method comprises the steps that a coordination control mechanism of a wind storage isolated network power supply system is established, namely, in the wind storage isolated network system, coordination control among wind power, stored energy power and load power is carried out by adopting a multi-agent-based control technology;
establishing an upper-layer coordination control intelligent body of the wind storage isolated network power supply system refers to establishing an intelligent centralized control module of the wind storage isolated network system, realizing the functions of communication and data acquisition with a lower-layer unit distributed control intelligent body, analyzing and deciding according to the history and the current operating state of the system, and issuing a coordination control instruction to the lower-layer unit distributed control intelligent body;
the establishment of the lower-layer unit decentralized control intelligent agent of the wind storage isolated network power supply system refers to the addition of an independent intelligent control module in a wind generating set, an energy storage unit and a load, and the functions of data acquisition, power control, communication with an upper-layer coordinated control intelligent agent and the like of each decentralized unit are realized.
The upper layer coordination control intelligent agent calculates the power balance deviation, namely, the power balance deviation is calculated according to the following formula:
ΔP＝KLPLOAD-KWPW-PB-KFΔF
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; pLOADActive load power in a wind storage isolated grid power supply system; pWActive power of a wind turbine generator in a wind storage isolated grid power supply system is provided; kLThe load power is a load power adjusting parameter, and the value of the load power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; kWThe wind power is a wind power adjusting parameter, and the value of the wind power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; pBCharging and discharging power sum of an energy storage unit in the wind storage isolated network power supply system; Δ F is the system frequency deviation; kFAnd the unit regulating power of the wind storage isolated network power supply system is provided.
The balance power deviation is distributed to each energy storage unit to obtain the flexible coordination factor, namely the power distribution is carried out according to the following constraints:
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; delta PiThe power regulating quantity of the ith energy storage unit in the wind storage isolated network system is the flexible coordination factor of the distributed power; pBiInstantaneous power of the ith energy storage unit; pBi maxThe instantaneous charging or discharging power limit value of the ith energy storage unit.
Fig. 1 is a schematic diagram of a wind storage isolated network system, and the system of the wind storage isolated network system mainly comprises: the system comprises a wind power generation system, an energy storage unit, a load and the like.
The independent wind storage micro-grid system mainly comprises a wind driven generator, a rectification and inversion control system, an energy storage system and an alternating current load; the energy storage system is connected to an alternating current bus as an energy conversion device, so that the redundant electric quantity generated by the wind turbine generator can be stored, the power fluctuation of the system is stabilized, the electric energy quality is improved, power can be supplied to a load under the extreme climate condition, the stability of the voltage and the frequency of the system is maintained, and the power supply quality of the wind storage isolated grid system is ensured so as to meet the power utilization requirement of the load. However, the single independent wind storage micro-grid system has poor operation reliability under the influence of wind resource randomness, volatility and characteristics of the wind turbine generator. Aiming at the situation, a plurality of wind turbines or the wind turbines and other renewable energy sources can be combined and used in the independent micro-grid system, so that the problem of poor operation reliability of the single independent micro-grid system is solved.
The structural schematic diagram of the wind storage isolated network system is shown in figure 1. The wind storage isolated network system mainly comprises a wind power generation system, an energy storage unit and a load. Compared with a double-fed wind generating set, the direct-drive permanent magnet wind generating set greatly reduces the maintenance cost of the system and improves the reliability of the system because an electric brush, a slip ring and a gear box are omitted.
In the wind storage isolated network system, the direct-drive permanent magnet wind power generation system mainly comprises a wind turbine, a direct-drive permanent magnet wind power generator, a machine side rectifier, a network side inverter and a filter device; the energy storage unit mainly comprises a storage battery, a DC/DC bidirectional converter, an energy storage inverter and a filter device, and the direct-drive permanent magnet wind driven generator and the energy storage unit jointly supply power to a load through an alternating current bus.
The working process of the wind storage isolated network system is as follows: the wind turbine captures the maximum mechanical power from natural wind and transmits the generated mechanical power to the generator set through the main shaft, and the electricity generated by the generator set supplies power to a load through the back-to-back converter control circuit and the filter device; the energy storage unit controls the on-off of each bridge arm of the energy storage inverter by collecting voltage and current signals of the side of the alternating current bus so as to restrain the fluctuation of wind power output power caused by sudden change of wind speed; when the wind power output is too small, the energy storage unit can deliver the stored power to supply power to the load.
FIG. 2 is a multi-agent control intent; a "multi-agent" is generally a multi-agent system (or multi-agent technology. the multi-agent system is an important branch of distributed artificial intelligence, and is the leading discipline of artificial intelligence internationally in the last 20 th century to the beginning of 21 st century. research aims at solving large and complex real problems, and the capacity of a single agent is exceeded by the research, the multi-agent system is a set of a plurality of agents, and aims at constructing a large and complex system into small, mutually communicating and coordinating with each other, and easily managed systems, the research of the multi-agent relates to the knowledge, target, skill, planning of the agents, and how to make the agents take coordination action to solve the problems, etc. the research mainly aims at interactive communication, coordination and conflict resolution among the agents, emphasizes close group cooperation among the agents rather than autonomous and play of individual capacity, it is mainly explained how to analyze, design and integrate a plurality of agents to form a system which cooperates with each other.
The multi-agent technology is a behavior characteristic that the functions of the system are realized through the autonomous behavior of each agent and the coordination, control, scheduling and the like among unit agents. As an important branch of the artificial intelligence system, the multi-agent technology is a major research direction in the future because it can solve the problem of coordination control and communication of the control system. Based on a plurality of advantages of the multi-agent technology, the method can be applied to the coordination control of the wind storage isolated network system, not only can the problem of communication lag existing in the traditional coordination algorithm be solved, but also the coordination control of the wind storage isolated network system can be realized in a layered mode.
Wind storage isolated network system coordination control based on multi-agent technology can be realized through two layers of agents: the upper layer coordination control intelligent agent and the lower layer unit decentralized control intelligent agent. In the wind storage isolated network system, the distributed control of the lower unit intelligent bodies is realized by designing inverter interfaces and load ports of a wind power generation system and an energy storage unit, and the distributed control of the lower unit intelligent bodies mainly realizes the power and voltage output control, system power sampling and alternating current bus voltage sampling of each unit of the wind power generation system and the energy storage unit in the wind storage isolated network system. The upper-layer coordination control intelligent agent performs relevant calculation on an active power sampling value and a voltage sampling value of the lower-layer unit intelligent agent of the wind storage isolated network system at any moment, issues an action execution command through the decision module and the coordination control command module, and sends the command to the lower-layer unit distributed control intelligent agent through the communication channel. In the wind storage isolated network system, an interactive behavior exists between an upper layer coordination control intelligent agent and a lower layer unit distributed control intelligent agent, the interactive behavior between the upper layer coordination control intelligent agent and the lower layer unit distributed control intelligent agent is realized through direct action, and the interactive behavior between the lower layer unit distributed control intelligent agent and the upper layer coordination control intelligent agent is realized through indirect action. The upper layer coordinately controls the intelligent agent and the lower layer unit dispersedly controls the interactive process of the intelligent agent. In the wind storage isolated network power supply system based on the flexible coordination factor, the lower unit distributed control intelligent body can realize the sensing and interaction between the lower unit and the external environment, and can also realize the control of each unit intelligent body in the wind storage isolated network system, thereby ensuring the stability of the output voltage and frequency of the wind storage isolated network system. Meanwhile, the upper-layer coordination control intelligent body can judge the active power difference of each unit in the lower-layer unit distributed control intelligent body under the conditions of operation and disturbance, and control the instruction module to issue an action execution command;
FIG. 3 is a schematic view of a wind storage isolated network system coordination control instruction flow chart based on a flexible coordination factor;
after the principle of the wind storage isolated network system based on the multi-agent technology and the interactive response process, how to realize the design of the wind storage isolated network system coordination control instruction based on the multi-agent technology is the key for ensuring the coordinated operation of the wind storage isolated network system. The generation of the active power coordination control instruction in the wind storage isolated network system is mainly determined by an active balance power difference calculation module, a decision module, a coordination control instruction and other modules of an upper layer coordination control intelligent agent, and the generation process of the wind storage isolated network system coordination control instruction based on the multi-intelligent agent technology is as follows: the upper-layer coordination control intelligent body performs subtraction and judgment on active power sampling values of the lower-layer unit intelligent bodies of the wind storage isolated network system at any moment, and gives a trigger signal control instruction of charging/discharging of the bidirectional DC/DC converter through the decision module and the coordination control instruction module; after the lower-layer unit distributed control intelligent body receives the action execution command of the upper-layer coordination control intelligent body, the charge and discharge of the energy storage system are controlled through the negotiation layer and the reaction layer. The method comprises the following specific steps:
(1) acquiring operating parameters of a wind storage isolated network power supply system;
(2) establishing a coordination control mechanism of the wind storage isolated network power supply system;
(3) calculating a flexible coordination factor of power balance of the wind storage isolated network power supply system;
1) the upper layer coordination control intelligent body samples the active power of the lower layer unit intelligent body of the wind storage isolated network system;
2) the upper layer coordination control agent calculates the balance power deviation;
3) judging whether the balance power deviation is greater than a power coordination control threshold value, and if the balance power deviation is greater than the power coordination control threshold value, performing the step 4); otherwise, turning to the step 1);
4) distributing the balance power deviation to each energy storage unit to obtain a flexible coordination factor;
(4) the upper-layer coordination control intelligent agent distributes the flexible coordination factors to the lower-layer energy storage unit distributed control intelligent agent;
(5) the energy storage inverter performs power control;
a wind storage isolated power grid model which is mainly composed of a wind turbine generator, an energy storage unit and a load is built according to a system block diagram in the figure 1, wherein a wind power generation system adopts a direct-drive permanent magnet wind turbine generator, and therefore an electric brush, a pulley, a gear box and the like can be omitted, maintenance cost of the system can be greatly reduced, and reliability of the system can be improved.
A wind power generation system in a wind storage isolated network system based on a flexible coordination factor mainly adopts a control strategy of a back-to-back converter, the back-to-back converter of the wind power generation system mainly comprises a generator side rectifier and a network side inverter, and the generator side rectifier is connected with the network side inverter through a direct current side capacitor. The generator side rectifier mainly has the functions of realizing the control of the active power of the generator and reducing the power loss of the generator; the grid-side inverter is mainly used for realizing grid-side power factor adjustment or reactive power control and providing stable direct-current voltage control, and adopts a PQ control strategy of a voltage outer ring and a current inner ring.
The energy storage unit in the wind storage isolated network system based on the flexible coordination factor achieves coordination control of active power of the energy storage unit and maintains stability of voltage and frequency of an alternating current bus side according to cooperative work of the energy storage inverter and the bidirectional DC/DC converter. The bidirectional DC/DC converter adopts a control strategy of a voltage outer ring and a current inner ring, and the energy storage inverter adopts a droop control mode. The energy storage unit Agent is designed at an energy storage inverter interface so as to realize output control of energy storage unit power and voltage, system power sampling and voltage sampling.
And building a system simulation model in a Matlab/Simulink platform according to the control strategy and the model selection expression. The basic parameters are set as follows: the rated wind speed is 12m/s, the rated active power output by the fan is 25kW, the initial active power of the load on the AC bus side is 40kW, the reactive power is 0kVar, the initial value of the charge state of the storage battery is 80%, and the simulation time is 2 s.
In the simulation process, the load is stably operated within the first 1s, the load active power of the alternating current side is reduced to 30KW within 1s, and the load of the alternating current bus side is restored to the initial active power of 40KW after 1.5 s. Before 1s, the system was in steady state operation. At 1s, the load on the side of the alternating current bus is reduced to 30KW, the frequency fluctuation amplitude is reduced at the moment of sudden load change, the output current on the side of the alternating current load is reduced along with the reduction of the load, the three-phase voltage output by the side of the alternating current load slightly oscillates at the moment of 1s load reduction, however, the reactive power parameter is 0 due to model building, the multi-agent interaction principle system is safe and stable in the wind storage isolated grid power supply system based on the flexible coordination factor, and the output three-phase voltage returns to the stable operation state. After 1.5s, the load on the side of the alternating current bus is recovered to the initial active power of 40KW, the frequency fluctuation amplitude on the side of the alternating current bus is consistent with the stable running state before 1s, and the three-phase current output by the side of the alternating current load is recovered to the original value. Therefore, the conclusion can be drawn that the coordination control method of the wind storage isolated network power supply system based on the flexible coordination factor has effectiveness.
Claims (1)
1. A wind storage isolated network power supply system coordination control method based on flexible coordination factors is characterized in that in an isolated power supply system composed of a wind turbine generator and an energy storage device, the balance power of the isolated network system is dynamically calculated on line, and power control parameters of each operation unit are dynamically adjusted by the flexible coordination factors according to the operation conditions of the system, so that the wind storage isolated network system is coordinately controlled and stably operated; the method is characterized in that: the method comprises the following steps:
step 1) acquiring operation parameters of a wind storage isolated network power supply system;
step 2) establishing a coordination control mechanism of the wind storage isolated network power supply system;
(1) establishing an upper layer coordination control intelligent agent of a wind storage isolated network power supply system;
(2) establishing a wind storage isolated network power supply system lower layer unit distributed control intelligent agent;
(3) the interaction between the upper layer coordination control intelligent agent and the lower layer unit distributed control intelligent agent is realized through direct action;
(4) the interaction behavior between the lower-layer unit decentralized control agent and the upper-layer coordinated control agent is realized through indirect action;
step 3) calculating a flexible coordination factor for power balance of the wind storage isolated network power supply system;
(1) the upper layer coordination control intelligent agent samples active power of the lower layer unit distributed control intelligent agent of the wind storage isolated network system;
(2) the upper layer coordination control agent calculates the balance power deviation;
(3) judging whether the balance power deviation is greater than a power coordination control threshold value, and if the balance power deviation is greater than the power coordination control threshold value, performing the step (4); otherwise, turning to the step (1);
(4) distributing the balance power deviation to each energy storage unit to obtain a flexible coordination factor;
step 4), the upper layer coordination control intelligent agent distributes the flexible coordination factors to the lower layer unit distributed control intelligent agent;
step 5), the energy storage inverter implements power control;
the wind power storage isolated grid power supply system in the step 1) is an independent alternating current power supply system consisting of a wind turbine generator and an energy storage system;
the method comprises the following steps that 1) the operation parameters of the wind storage isolated network system are parameters required by grid calculation and control, such as active power, reactive power, the charge state of an energy storage system, the load power of the wind storage isolated network system, alternating-current bus voltage and frequency and the like, which are output by a wind turbine generator;
the step 2) of establishing a coordination control mechanism of the wind storage isolated network power supply system refers to that coordination control among wind power, stored energy power and load power is carried out in the wind storage isolated network system by adopting a multi-agent-based control technology;
step 2) establishing an upper-layer coordination control intelligent body of the wind storage isolated network power supply system refers to establishing an intelligent centralized control module of the wind storage isolated network system, realizing the functions of communication and data acquisition with a lower-layer unit distributed control intelligent body, analyzing and deciding according to the history and the current operating state of the system, and issuing a coordination control instruction to the lower-layer unit distributed control intelligent body;
the establishment of the lower-layer unit decentralized control intelligent agent of the wind storage isolated network power supply system refers to the addition of an independent intelligent control module in a wind generating set, an energy storage unit and a load, and the functions of data acquisition, power control, communication with an upper-layer coordinated control intelligent agent and the like of each decentralized unit are realized;
the upper layer coordination control intelligent agent calculates the power balance deviation, namely, the power balance deviation is calculated according to the following formula:
ΔP＝KLPLOAD-KWPW-PB-KFΔF
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; pLOADActive load power in a wind storage isolated grid power supply system; pWActive power of a wind turbine generator in a wind storage isolated grid power supply system is provided; kLThe load power is a load power adjusting parameter, and the value of the load power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; kWThe wind power is a wind power adjusting parameter, and the value of the wind power adjusting parameter is obtained by analyzing and predicting by an upper layer coordination control intelligent agent according to the historical data and the current running state of the system; pBCharging and discharging power sum of an energy storage unit in the wind storage isolated network power supply system; Δ F is the system frequency deviation; kFThe unit power of the wind storage isolated network power supply system is adjusted;
the balance power deviation is distributed to each energy storage unit to obtain the flexible coordination factor, namely the power distribution is carried out according to the following constraints:
wherein: delta P represents a balance power difference value required in the process of coordinating active power balance and maintaining system frequency by the system; delta PiFor the power regulation quantity of the ith energy storage unit in the wind storage isolated network system, namely, distributing powerA flexible co-ordination factor of (c); pBiInstantaneous power of the ith energy storage unit; pBi maxThe instantaneous charging or discharging power limit value of the ith energy storage unit.
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