Micro-grid cluster system operation control method based on demand and contribution equivalence

Abstract

The application discloses a micro-grid cluster system operation control method based on demand and contribution peer-to-peer. According to the principles of power demand or power supply contribution and queuing rules agreed in advance, the micro-grid cluster electric quantity management and control system GEMS carries out statistical queuing on the micro-grid systems applying for power demand or power supply contribution according to the set balance adjustment period T, selects the power demand application in the front of the power demand queue, preferentially supplies power according to the micro-grid systems preferentially responding to power supply, and distributes the power supply according to the proportion of the power supply contribution power and electric quantity reported by other micro-grid systems, so as to generate electric quantity interaction instructions and send the electric quantity interaction instructions to the corresponding micro-grid systems EMS for execution. The settlement and accounting are carried out according to the agreed current electricity price at the end of the period T, the electric quantity of the micro-grid systems is orderly controlled and interacted, the micro-grid system electric quantity surplus and deficiency adjustment is reasonably solved, and the micro-grid cluster system is safely, reliably and stably operated.

Description

Technical Field

[0001] This invention belongs to the field of microgrid technology, specifically relating to a method for operating and controlling a microgrid cluster system based on the equivalence of demand and contribution. Background Technology

[0002] The transformation of the energy structure has promoted the widespread application of new energy sources, especially distributed renewable energy. However, the uncertainty and volatility of distributed renewable energy pose significant challenges to the stable operation of electricity and the power grid. To address this, using local microgrids to connect distributed renewable energy, energy storage, and loads for local balancing and consumption is one effective method for the efficient application of distributed renewable energy. Because distributed renewable energy has a relatively low power density, it is suitable for decentralized, localized installation and application. For example, building-based solar power systems combined with peak-shaving and valley-filling energy storage can form microgrid systems. Furthermore, different owners and investors invest in and construct distributed renewable energy microgrid systems at different times and locations based on their own conditions. The application of distributed renewable energy microgrid systems is a gradual and developing process, and the phenomenon of building multiple microgrid systems in a single area is beginning to emerge. Therefore, researching the connection of multiple decentralized microgrids to form a microgrid cluster system for overall operation and resource sharing is a development trend in the application of distributed renewable energy. Microgrid cluster system technology is complex and still in its early stages; currently, there is no mature and effective method for constructing and controlling a microgrid cluster system. Summary of the Invention

[0003] To explore effective operation and control methods for microgrid cluster systems, and to achieve effective and stable control of the overall operation and resource balance of a microgrid cluster system by connecting multiple dispersed microgrids, this invention, based on the main technical characteristics and interconnection features of microgrids, realizes reasonable regulation and balance control of the power output of each microgrid system. Specifically, this invention discloses a microgrid cluster system operation and control method based on demand-contribution parity, characterized by:

[0004] Under the constraint of the agreed-upon principle of equal power demand and power supply contribution, each independently operating microgrid system is connected to the same power bus via controlled switches to form a microgrid cluster system. This mainly includes: the power grid connected to the power line via a power grid switch; the power line connecting to the first microgrid system, the second microgrid system, the i-th microgrid system, and the n-th microgrid system via a first microgrid system access switch; and the GEMS (Power Management System) connecting to the first microgrid control system, the second microgrid control system, and the i-th microgrid system via communication lines. The grid control system EMS, the nth microgrid control system EMS, and the first microgrid system access switch, the second microgrid system access switch, the ith microgrid system access switch, and the nth microgrid system access switch constitute a microgrid cluster system operating in parallel / off-grid mode. Its characteristics further include: the microgrid cluster power management system GEMS is connected to each independently operating microgrid system EMS via a communication network; each microgrid system balances power according to the principle of equal power demand and power contribution, and follows queuing rules; and adjusts the power surplus and deficit among microgrid systems in stages according to a predetermined period T. This effectively addresses the power surplus and deficit adjustment needs of the microgrid system while ensuring the overall stable operation of the microgrid cluster system.

[0005] Its characteristic also lies in the control method and control process of the microgrid cluster system where the power demand and power supply contribution are equal:

[0006] ① The microgrid cluster system is running normally. Each microgrid system is managed by the microgrid system EMS, operates independently and self-balanced, and maintains normal communication with the microgrid cluster management system GEMS.

[0007] ② The microgrid cluster management system GEMS monitors in real time and counts the applications for power demand or power contribution from each microgrid system EMS within time period t. There are two or more applications. The application content includes at least the time, power, and amount of power demand, as well as the maximum power and maximum amount of power contribution in this period, and meets the requirement of ≥ power demand and time. Based on this, the microgrid cluster management system GEMS queues the applications submitted by the microgrid systems according to the queuing rules.

[0008] ③ During time period t, does the microgrid cluster management and control system GEMS analyze and determine if there are any applications for power extraction or power supply contributions? If yes, execute ④; if no, continue monitoring and execute ②.

[0009] ④ Based on the principles and queuing rules of power demand or power contribution, the microgrid cluster management system GEMS selects the power demand application at the front of the power demand queue and prioritizes power supply to the microgrid system that responds to the power supply priority. The remaining power is allocated according to the proportion of the power contribution power and electricity declared by other microgrid systems. In this way, an electricity interaction command is generated and sent to the EMS of the corresponding microgrid system that declared the power contribution for execution. When only one microgrid system applies for power demand or power contribution interaction electricity demand, the microgrid cluster management system GEMS will not generate an electricity interaction command and wait to enter the next cycle Ti.

[0010] ⑤ The microgrid cluster management and control system GEMS sends power interaction commands to the corresponding microgrid system EMS and monitors the power interaction operation status;

[0011] ⑥ The microgrid cluster management and control system GEMS monitors the execution of power interaction commands in the microgrid system in real time. If the power interaction command is completed, execute ⑦; otherwise, execute ⑤.

[0012] ⑦ The microgrid cluster management system GEMS will queue up microgrid systems that have completed the power demand interaction and preferentially respond to their power supply requests;

[0013] ⑧ Has the microgrid cluster management and control system GEMS monitored the time period t? If no, proceed to ③; if yes, proceed to ⑨.

[0014] ⑨ Does the microgrid cluster power management system GEMS monitor whether the current period T has ended? If the agreed time period Ti ends, the next time period Ti+1 is started; if not, then execute ③; if yes, the microgrid cluster power management system GEMS will settle and record the agreed electricity price for the current period, and then execute ②.

[0015] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized by: setting a time interval of a certain duration as a balance adjustment cycle T; each microgrid system, in the time period t before the end of cycle T, that is, in the time period t before the end of this cycle T, submits the maximum value of the interaction between power demand and power supply contribution for the next cycle Ti; based on the principle of power demand and power supply contribution parity, a microgrid system can apply for two or more power exchange requests within a cycle T; however, after completing a power demand exchange, it must complete a power supply contribution exchange before it can execute the next power demand exchange request; it cannot continuously execute power demand requests or power supply contribution requests independently.

[0016] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized by the following: the microgrid cluster management and control system (GEMS) executes and queues the interactive electricity declared by each microgrid system's EMS according to queuing rules, namely, the interactive electricity demand and the interactive electricity supply contribution are arranged into two queues, and the number of microgrid systems declaring demand is ≥2. The queue for electricity demand is arranged in chronological order, while the queue for electricity supply contribution is arranged in descending order of power supply volume. Microgrid systems that have not declared interactive electricity do not participate in the queuing. After each electricity interaction is completed, the queuing order is adjusted once. Before the end of each cycle T, the queuing for the next cycle Ti is re-established. At the end of the current cycle T, settlement and accounting are performed based on the actual interactive electricity demand and electricity supply contribution, as well as the agreed electricity price for the current period.

[0017] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized in that: when a microgrid system performs power exchange, other microgrid system EMSs receive the power exchange command generated by the current power exchange issued by the microgrid cluster management and control system GEMS, and respond to the power exchange command with the required power and amount of exchange, while also satisfying the maximum power and amount of exchange requested by the microgrid system itself.

[0018] This invention discloses a microgrid cluster system operation control method based on demand and contribution parity. Through pre-agreed principles and queuing rules for power demand or power contribution, the microgrid cluster power management system (GEMS) communicates in real time with the power management systems (EMS) of each microgrid system. According to a set balance adjustment cycle T, the GEMS statistically queues the microgrid systems applying for power demand or power contribution. The GEMS selects the microgrid system at the front of the power demand queue and prioritizes power supply to that system. Any remaining power is allocated according to the proportion of power contribution declared by other microgrid systems. This generates power interaction commands, which are sent to the corresponding EMS of the declared power contribution microgrid system for execution. At the end of cycle T, settlement and accounting are performed according to the agreed current electricity price, achieving effective resource regulation and balance of the microgrid cluster system. This enables orderly and controlled interaction of power supply among the microgrid systems, effectively resolving power surplus and deficit adjustments while ensuring the overall safe, reliable, and stable operation of the microgrid cluster system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a microgrid cluster system based on the principle of demand and contribution parity.

[0020] Figure 2 This paper presents a microgrid cluster system operation control method and control flowchart based on demand and contribution parity. Detailed Implementation

[0021] As an example, a method for operating and controlling a microgrid cluster system based on demand-contribution equivalence is described in conjunction with the accompanying drawings. However, the described embodiments are only a portion, not all, of the embodiments of the present invention applied to the method for operating and controlling a microgrid cluster system based on demand-contribution equivalence. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the content given in this example.

[0022] like Figure 1 As shown, a microgrid cluster system operation control method based on demand and contribution parity is characterized by:

[0023] Under the constraint of the agreed power balance principle of equal demand and contribution, each independently operating microgrid system is connected to the same power bus through a controlled switch to form a microgrid cluster system. The main components include: the power grid (4) is connected to the power grid line (1) through the power grid switch (5), and the power grid line (1) is connected to the first microgrid system (11) through the first microgrid system access switch (31), the second microgrid system (12) through the second microgrid access switch (32), the i-th microgrid system (1i) through the i-th microgrid access switch (3i), and the n-th microgrid system (1n) through the n-th microgrid access switch (3n). At the same time, the microgrid cluster power management system GEMS (2) is connected to the first microgrid control system EMS (21) and the second microgrid system (1n) through the communication line (6). The microgrid cluster system consists of a microgrid control system EMS (22), an i-th microgrid control system EMS (2i), an n-th microgrid control system EMS (2n), a 1st microgrid system access switch (31), a 2nd microgrid system access switch (32), an i-th microgrid system access switch (3i), and an n-th microgrid system access switch (3n), and operates off-grid. Its characteristics are: the microgrid cluster power management system GEMS (2) is connected to each independently operating microgrid system EMS (2n) through a communication network, and each microgrid system balances power according to the principle of demand and contribution equality and queuing rules, and adjusts the power surplus and deficit between microgrids according to the agreed period T, so as to achieve reasonable solution of power surplus and deficit adjustment of microgrid system while ensuring the overall stable operation of microgrid cluster system.

[0024] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized by: setting a time interval of a certain duration as a balance adjustment cycle T; each microgrid system, in the time period t before the end of cycle T, that is, in the time period t before the end of this cycle T, submits the maximum value of the interaction between power demand and power supply contribution for the next cycle Ti; based on the principle of power demand and power supply contribution parity, a microgrid system can apply for two or more power exchange requests within a cycle T; however, after completing a power demand exchange, it must complete a power supply contribution exchange before it can execute the next power demand exchange request; it cannot continuously execute power demand requests or power supply contribution requests independently.

[0025] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized by the following: the microgrid cluster management and control system (GEMS) executes the interactive electricity declared by each microgrid system's EMS according to queuing rules, namely, the interactive electricity demand and the interactive electricity supply contribution are arranged into two queues, and the number of microgrid systems declaring the interactive electricity demand must be ≥2. The queue for electricity demand is arranged in chronological order, while the queue for declared electricity supply contribution is arranged in descending order of power supply volume. Microgrids that have not declared interactive electricity demand do not participate in the queuing. After each electricity interaction is completed, the queuing order is adjusted once. Before the end of each cycle T, the queues for the next cycle Ti are re-queued. At the end of the current cycle T, settlement and accounting are performed based on the actual interactive electricity demand and electricity supply contribution and the agreed electricity price for the current period.

[0026] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized in that: when a microgrid system performs power exchange, other microgrid system EMSs receive the power exchange command issued by the microgrid cluster management and control system GEMS, and respond to the power exchange command with the required power and amount of exchange, while also satisfying the maximum power and amount of exchange requested by the microgrid system itself.

[0027] The aforementioned microgrid cluster system operation control method based on demand and contribution parity is characterized by the following power balance operation method and control process based on the parity of power demand and power supply contribution:

[0028] ① The microgrid cluster system is running normally. Each microgrid system is managed by the microgrid system EMS, operates independently and self-balanced, and maintains normal communication with the microgrid cluster management system GEMS.

[0029] ② The microgrid cluster management system GEMS monitors in real time and counts the applications for power demand or power contribution from each microgrid system EMS within time period t. There are two or more applications. The application content includes at least the time, power, and amount of power demand, as well as the maximum power and maximum amount of power contribution in this period, and meets the requirement of ≥ power demand and time. Based on this, the microgrid cluster management system GEMS queues the applications submitted by the microgrid systems according to the queuing rules.

[0030] ③ During time period t, does the microgrid cluster management and control system GEMS analyze and determine if there are any applications for power extraction or power supply contributions? If yes, execute ④; if no, continue monitoring and execute ②.

[0031] ④ Based on the principles and queuing rules of power demand or power contribution, the microgrid cluster management system GEMS selects the power demand application at the front of the power demand queue and prioritizes power supply to the microgrid system that responds to the power supply priority. The remaining power is allocated according to the proportion of the power contribution power and electricity declared by other microgrid systems. In this way, an electricity interaction command is generated and sent to the EMS of the corresponding microgrid system that declared the power contribution for execution. When only one microgrid system applies for power demand or power contribution interaction electricity demand, the microgrid cluster management system GEMS will not generate an electricity interaction command and wait to enter the next cycle Ti.

[0032] ⑤ The microgrid cluster management and control system GEMS sends power interaction commands to the corresponding microgrid system EMS and monitors the power interaction operation status;

[0033] ⑥ The microgrid cluster management and control system GEMS monitors the execution of power interaction commands in the microgrid system in real time. If the power interaction command is completed, execute ⑦; otherwise, execute ⑤.

[0034] ⑦ The microgrid cluster management system GEMS will queue up microgrid systems that have completed the power demand interaction and preferentially respond to their power supply requests;

[0035] ⑧ Has the microgrid cluster management and control system GEMS monitored the time period t? If no, proceed to ③; if yes, proceed to ⑨.

[0036] ⑨ Does the microgrid cluster power management system GEMS monitor whether the current cycle T has ended? If the agreed time cycle Ti (such as 0-12 or 13-24 hours) ends, the next time cycle Ti+1 is started; if not, then execute ③; if yes, the microgrid cluster power management system GEMS will settle and record the agreed electricity price for the current period, and then execute ②.

[0037] This invention discloses a microgrid cluster system operation control method based on demand and contribution parity. Through pre-agreed principles and queuing rules for power demand or power contribution, the microgrid cluster power management system (GEMS) communicates in real time with the power management systems (EMS) of each microgrid system. According to a set balance adjustment cycle T, the GEMS statistically queues the microgrid systems applying for power demand or power contribution. The GEMS selects the microgrid system at the front of the power demand queue and prioritizes supplying power to it. Any remaining power is allocated according to the proportion of power contribution declared by other microgrid systems. This generates power interaction commands, which are sent to the corresponding microgrid system EMS for execution. At the end of cycle T, settlement and accounting are performed according to the agreed current electricity price, achieving effective resource regulation and balance of the microgrid cluster system. This enables orderly and controlled interaction of power among the microgrid systems, effectively resolving power surplus and deficit adjustments while ensuring the overall safe, reliable, and stable operation of the microgrid cluster system.

Claims

1. A microgrid cluster system operation control method based on demand and contribution parity, characterized by: Under the constraint of the agreed-upon principle of equal power demand and power supply contribution, each independently operating microgrid system is connected to the same power bus via a controlled switch to form a microgrid cluster system. This mainly includes: the power grid connected to the power line via a power grid switch; the power line connected to the first microgrid system via a first microgrid access switch, the second microgrid system via a second microgrid access switch, the i-th microgrid system via an i-th microgrid access switch, and the n-th microgrid system via an n-th microgrid access switch; and the microgrid cluster power management system (GEMS) connected to the first microgrid control system (EMS), the second microgrid control system (EMS), and the i-th microgrid system via communication lines. The control system EMS, the nth microgrid control system EMS, and the first microgrid system access switch, the second microgrid system access switch, the ith microgrid system access switch, and the nth microgrid system access switch constitute a microgrid cluster system operating in parallel / off-grid mode. Its characteristics further include: the microgrid cluster power management system GEMS is connected to each independently operating microgrid control system EMS via a communication network; and each microgrid system balances power according to the principle of equal power demand and power contribution, and follows queuing rules; and adjusts the power surplus and deficit among microgrid systems in stages according to a predetermined period T. This effectively addresses the power surplus and deficit adjustment needs of the microgrid system while ensuring the overall stable operation of the microgrid cluster system. Its characteristic also lies in the control method and control process of the operation of the microgrid cluster system where the power demand and power supply contribution are equal: ① The microgrid cluster system is running normally. Each microgrid system is managed by the microgrid control system EMS, operates independently and self-balanced, and maintains normal communication with the microgrid cluster management system GEMS. ② The microgrid cluster management system GEMS monitors in real time and, during the time period t before the end of cycle T, that is, during the time period t before the end of this cycle T, counts the applications for power demand or power contribution from each microgrid control system EMS, and there are two or more applications. The application content includes at least the time, power, and amount of power demand, as well as the maximum power and maximum amount of power contribution in this cycle. Based on this, the microgrid cluster management system GEMS queues the applications submitted by the microgrid systems according to the queuing rules. ③ Before the end of this cycle T, the microgrid cluster management and control system GEMS analyzes and judges whether there are any applications for power demand or power supply contribution. If yes, execute ④; if no, continue monitoring and execute ②. ④ Based on the principles and queuing rules of power demand or power contribution, the microgrid cluster management system GEMS selects the power demand application at the front of the power demand queue and prioritizes power supply to the microgrid system that responds to the power supply priority. The remaining power is allocated according to the proportion of the power contribution and electricity of other microgrid systems. This generates an electricity interaction command, which is sent to the corresponding microgrid control system EMS to execute. When only one microgrid system applies for power demand or power contribution interaction electricity demand, the microgrid cluster management system GEMS will not generate an electricity interaction command and will wait to enter the next cycle Ti. ⑤ The microgrid cluster management and control system GEMS sends power interaction commands to the corresponding microgrid control system EMS and monitors the power interaction operation status; ⑥ The microgrid cluster management and control system GEMS(2) monitors the execution of power interaction commands in the microgrid system in real time. When the power interaction command is completed, it executes ⑦; otherwise, it executes ⑤. ⑦ The microgrid cluster management system GEMS will queue up microgrid systems that have completed the power demand interaction and preferentially respond to their power supply requests; ⑧ The microgrid cluster management and control system GEMS monitors whether the time t before the end of this cycle T has been reached. If not, execute ③; if yes, execute ⑨. ⑨ The microgrid cluster power management system GEMS monitors whether the current period T has ended. If the agreed time period T ends, the next time period Ti is started; if not, then ③ is executed; if yes, the microgrid cluster power management system GEMS will settle and record the agreed electricity price for the current period, and then ② is executed.

2. The microgrid cluster system operation control method based on demand and contribution parity as described in claim 1, characterized in that: A time interval of a certain duration is defined as a balancing and adjustment cycle T. During the time period t before the end of cycle T, each microgrid system submits the maximum value of the interaction between power demand and power supply contribution for the next cycle Ti. Based on the principle of equivalence between power demand and power supply contribution, a microgrid system can apply for two or more power exchange requests within a cycle T. However, after completing a power demand exchange, a power supply contribution exchange must be completed before the next power demand exchange can be executed. Continuous execution of power demand requests or power supply contribution requests is not allowed.

3. The microgrid cluster system operation control method based on demand and contribution parity as described in claim 1, characterized in that: the microgrid The cluster management system GEMS executes and queues the interactive electricity declared by each microgrid control system EMS according to queuing rules. That is, the interactive electricity for power demand and the interactive electricity for power supply contribution are arranged into two queues, and the number of microgrid systems that declare demand is ≥2. The queue for power demand is arranged in chronological order, and the queue for power supply contribution is arranged in descending order of power supply amount. Microgrid systems that have not declared interactive electricity do not participate in queuing. After each electricity interaction is completed, the queuing order is adjusted once. Before the end of each cycle T, the queuing for the next cycle Ti is re-established. At the end of the current cycle T, settlement and accounting are performed according to the actual interactive electricity demand and power supply contribution and the agreed electricity price for the current period.

4. The microgrid cluster system operation control method based on demand and contribution parity as described in claim 1, characterized in that: in When a microgrid system performs power exchange, other microgrid control systems (EMS) receive the power exchange command generated by the current power exchange from the microgrid cluster management system (GEMS), and respond to the power exchange command with the required power and amount of power, while also meeting the maximum power and amount of power requested by the microgrid system itself.

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