Multi-port micro-grid networking equipment power optimization control method and device

Abstract

The invention relates to a multi-port micro-grid networking equipment power optimization control method and device, and the method comprises the steps: judging the access state of a distributed energy port at an AC side; when no access element exists, a control strategy of alternating current and direct current micro-grid mutual standby power supply is adopted; when the access element exists, judging the type of the access element; when the access element is the energy storage module and the condition of the alternating current power supply port at the alternating current side is power loss, performing power optimization by adopting a first control strategy; when the access element is the energy storage module and the condition of the alternating current power supply port at the alternating current side is normal, performing power optimization by adopting a second control strategy; when the access element is a photovoltaic module and the condition of the alternating current power supply port at the alternating current side is normal, performing power optimization by adopting a third control strategy; and when the access element is the photovoltaic module and the condition of the AC power supply port at the AC side is power loss, not executing any power allocation. According to the invention, the adaptability of the micro-grid system to complex and changeable operation conditions can be improved.

Description

Technical Field

[0001] This invention relates to the field of microgrid energy management technology, and in particular to a power optimization control method and apparatus for multi-port microgrid networking equipment. Background Technology

[0002] With the development of distributed energy resources (such as photovoltaics) and energy storage technologies, the application of AC / DC hybrid microgrids is becoming increasingly widespread. Multi-port microgrid networking equipment, as the core equipment for constructing AC / DC hybrid microgrids, requires reasonable energy management strategies to coordinate the power flow at each port in order to improve energy utilization and ensure the stable operation of the microgrid.

[0003] Currently, in terms of microgrid energy management, there are problems such as insufficient consideration of power allocation and absorption under actual multi-scenario operation, and inadequate strategy flexibility and adaptability. Therefore, a more comprehensive energy management method is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a power optimization control method and device for multi-port microgrid networking equipment, which can improve the adaptability of microgrid systems to complex and variable operating conditions.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide a power optimization control method for multi-port microgrid networking equipment, comprising the following steps:

[0006] Determine the access status of the distributed energy ports on the AC side in a multi-port microgrid networking device;

[0007] When there are no connected elements on the AC side of the distributed energy port in the multi-port microgrid networking equipment, a control strategy of mutual backup power supply between AC and DC microgrids is adopted.

[0008] When there is an access element on the AC side of the distributed energy port in the multi-port microgrid networking equipment, determine the type of the access element;

[0009] When the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power, a first control strategy is adopted for power optimization. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment.

[0010] When the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, a second control strategy is adopted for power optimization. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port on the DC side of the multi-port microgrid networking equipment according to priority.

[0011] When the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, a third control strategy is adopted for power optimization. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port and the DC side photovoltaic port in the multi-port microgrid networking equipment.

[0012] When the access element is a photovoltaic module, and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power, no power allocation is performed.

[0013] The control strategy for the AC / DC microgrid mutual backup power supply is as follows:

[0014] When the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in DC voltage reactive (UdcQ) mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start in voltage frequency (Vf) mode, so that the AC load port on the AC side of the multi-port microgrid networking equipment is powered by the DC side of the multi-port microgrid networking equipment.

[0015] When the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start fault transfer, so that the AC side of the multi-port microgrid networking equipment supplies power to the DC load port on the DC side of the multi-port microgrid networking equipment.

[0016] The first control strategy is as follows:

[0017] When the state of charge of the energy storage module is greater than the state of charge limit, a first allocation strategy is adopted according to the operating mode of the AC power port on the DC side of the multi-port microgrid networking equipment. The first allocation strategy is used to prioritize the consumption of surplus photovoltaic power.

[0018] When the state of charge of the energy storage module is not greater than the state of charge limit, a second allocation strategy is adopted according to the operating mode of the AC power supply port on the DC side of the multi-port microgrid networking equipment. The second allocation strategy is used to restore the power of the AC side energy storage port while ensuring the AC load port on the AC side of the multi-port microgrid networking equipment.

[0019] The first allocation strategy is as follows:

[0020] When the AC power port on the DC side of the multi-port microgrid network device operates in UdcQ mode, the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid network device is calculated. When the net power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid network device through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid network device. If the photovoltaic power is still not fully utilized at this time, the energy storage port on the DC side of the multi-port microgrid network device is charged. When the net power is not greater than zero, the AC load port on the AC side of the multi-port microgrid network device is powered by the energy storage port on the AC side, and power distribution is not performed.

[0021] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed;

[0022] When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment. When the net power value is not greater than zero, power allocation is not performed.

[0023] The second allocation strategy is as follows:

[0024] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, the DC side of the multi-port microgrid networking equipment supplies power to the AC load port on the AC side of the multi-port microgrid networking equipment and charges the energy storage port on the AC side of the multi-port microgrid networking equipment.

[0025] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed;

[0026] When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment and to charge the energy storage port on the AC side. When the net power value is not greater than zero, power dispatch is not performed.

[0027] The second control strategy is as follows:

[0028] Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment;

[0029] When the net power value is greater than zero, determine whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin.

[0030] When the DC-side energy storage port has a charging margin, the remaining photovoltaic power is used to charge the devices connected to the energy storage port. If there is still remaining photovoltaic power after the devices connected to the energy storage port are fully charged, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load ports on the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after powering the AC load ports on the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port.

[0031] When the DC-side energy storage port has no charging margin, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load port of the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the AC load port of the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port.

[0032] Power allocation will not be performed if the net power value is not greater than zero.

[0033] The third control strategy is specifically as follows:

[0034] Calculate the net power between the photovoltaic port and the AC load port on the AC side of the multi-port microgrid networking equipment to obtain the first net power value;

[0035] Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment to obtain the second net power value;

[0036] When both the first net power value and the second net power value are greater than zero, it is determined whether the DC-side energy storage port in the multi-port microgrid networking equipment has a charging margin. If the DC-side energy storage port has a charging margin, the equipment connected to the DC-side energy storage port is charged.

[0037] When the first net power value is greater than zero and the second net power value is not greater than zero, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power on the AC side of the multi-port microgrid networking equipment to the DC load port on the DC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the DC load port on the DC side, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power is used to charge the equipment connected to the energy storage port on the DC side.

[0038] When the first net power value is not greater than zero and the second net power value is greater than zero, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power on the DC side of the multi-port microgrid networking equipment is used to charge the equipment connected to the energy storage port on the DC side. If there is still remaining photovoltaic power after charging the equipment connected to the energy storage port on the DC side, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power to the AC side of the multi-port microgrid networking equipment to power the AC load port on the AC side of the multi-port microgrid networking equipment.

[0039] Power allocation is not performed when both the first net power value and the second net power value are not greater than zero.

[0040] The technical solution adopted by this invention to solve its technical problem is: to provide a power optimization control device for multi-port microgrid networking equipment, comprising:

[0041] The access status determination module is used to determine the access status of the distributed energy ports on the AC side in a multi-port microgrid networking device.

[0042] The first execution module is used to adopt a control strategy of mutual backup power supply between AC and DC microgrids when there are no connected elements on the distributed energy port of the AC side in the multi-port microgrid networking equipment.

[0043] The access element determination module is used to determine the type of the access element when there is an access element on the distributed energy port on the AC side of the multi-port microgrid networking equipment.

[0044] The second execution module is used to perform power optimization using a first control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment.

[0045] The third execution module is used to perform power optimization by adopting a second control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port on the DC side of the multi-port microgrid networking equipment according to priority.

[0046] The fourth execution module is used to perform power optimization using a third control strategy when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port and the DC side photovoltaic port in the multi-port microgrid networking equipment.

[0047] The fifth execution module is used to not perform any power allocation when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized.

[0048] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-mentioned power optimization control method for multi-port microgrid networking equipment.

[0049] The technical solution adopted by the present invention to solve its technical problem is: to provide a computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the steps of the above-mentioned power optimization control method for multi-port microgrid networking equipment are implemented.

[0050] Beneficial effects

[0051] Due to the adoption of the above technical solutions, this invention has the following advantages and positive effects compared with the prior art: This invention classifies microgrid access elements according to scenarios and implements differentiated customization strategies, ensuring that there are clear power control strategies under different equipment configurations and operating conditions. Furthermore, it subdivides the power supply operating conditions on the AC side, realizing optimized control and allocation of power and stable and efficient operation under the arbitrary access conditions of multiple elements in multi-port microgrid networking equipment. At the same time, it solves the problem of high curtailment rate in traditional solutions. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of a multi-port microgrid networking device according to the first embodiment of the present invention;

[0053] Figure 2 This is a flowchart of the power optimization control method for multi-port microgrid networking equipment according to the first embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the control strategy for AC / DC microgrid mutual backup power supply in the first embodiment of the present invention;

[0055] Figure 4 This is a schematic diagram of the first control strategy in the first embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of the first allocation strategy in the first embodiment of the present invention;

[0057] Figure 6 This is a schematic diagram of the second allocation strategy in the first embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the second control strategy in the first embodiment of the present invention;

[0059] Figure 8 This is a schematic diagram of the third control strategy in the first embodiment of the present invention. Detailed Implementation

[0060] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0061] The first embodiment of the present invention relates to a power optimization control method for multi-port microgrid networking equipment. This method classifies the access status of microgrid elements, calculates the net power value of distributed energy and load ports on the AC and DC sides, formulates the power consumption sequence and energy management strategy of distributed photovoltaic power, and realizes adaptive optimization allocation of power at each port. It can quickly start energy storage power supply or cross-microgrid power mutual assistance when AC power fails, and allocates surplus photovoltaic power to energy storage or loads according to priority when there is surplus photovoltaic power. This realizes optimized power control between microgrids, effectively reduces curtailment of photovoltaic power and power outage time, improves system operation stability and economy, and can meet the power optimization allocation needs of multi-port microgrid networking equipment under any networking of multiple elements such as AC power, AC load, distributed photovoltaic, energy storage and DC load.

[0062] This method is mainly applied to multi-port microgrid networking equipment, such as... Figure 1As shown, the multi-port microgrid networking equipment includes an AC microgrid section, a DC microgrid section, and an interconnection ACDC module. The AC microgrid section has three ports: an AC power supply port, an AC load port, and a photovoltaic / energy storage port (i.e., a distributed energy port). The DC microgrid section has four ports: an AC power supply port, a distributed photovoltaic port, an energy storage port, and a DC load port. The AC power supply port can connect to AC power sources such as wind turbines and diesel generators on the low-voltage side of the distribution area.

[0063] like Figure 2 As shown, the power optimization control method for multi-port microgrid networking equipment in this embodiment includes the following steps:

[0064] Step 1: Determine the access status of the distributed energy port 3 on the AC side of the multi-port microgrid networking equipment.

[0065] Step 2: When there are no connected elements on the AC side of the distributed energy port 3 in the multi-port microgrid networking equipment, a control strategy of mutual backup power supply between AC and DC microgrids is adopted.

[0066] like Figure 3 As shown, the control strategy for the AC / DC microgrid mutual backup power supply is as follows:

[0067] When the AC power port 1 on the AC side of the multi-port microgrid networking equipment is de-energized, and the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start in Vf mode, and the AC load port 2 on the AC side of the multi-port microgrid networking equipment is powered by the DC side of the multi-port microgrid networking equipment.

[0068] When the AC power port 1 on the AC side of the multi-port microgrid networking equipment is in normal condition, and the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start fault transfer, and the AC side of the multi-port microgrid networking equipment supplies power to the DC load port 7 on the DC side of the multi-port microgrid networking equipment.

[0069] Step 3: When there is an access element on the AC side of the distributed energy port 3 in the multi-port microgrid networking equipment, determine the type of the access element.

[0070] Step 4: When the distributed energy port 3 on the AC side of the multi-port microgrid networking equipment is connected to an energy storage module, and the AC power port 1 on the AC side of the multi-port microgrid networking equipment is in a state of power failure, the energy storage module of the distributed energy port 3 starts up in Vf mode and uses the first control strategy for power optimization. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment.

[0071] like Figure 4 As shown, the first control strategy is as follows:

[0072] When the state of charge of the energy storage module is greater than the state of charge limit, a first allocation strategy is adopted according to the operating mode of the AC power port 4 on the DC side of the multi-port microgrid networking equipment. The first allocation strategy is used to prioritize the consumption of surplus photovoltaic power.

[0073] When the state of charge of the energy storage module is not greater than the state of charge limit, a second allocation strategy is adopted according to the operating mode of the AC power port 4 on the DC side of the multi-port microgrid networking equipment. The second allocation strategy is used to restore the power of the energy storage module at port 3 as soon as possible while ensuring the power supply to the AC load port 2 on the AC side.

[0074] like Figure 5 As shown, the first allocation strategy is as follows:

[0075] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, calculate the net power between the photovoltaic port 5 and the DC load port 7 on the DC side of the multi-port microgrid networking equipment. When the net power value When the power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment; if the photovoltaic power is still not fully utilized at this time, the energy storage port 6 on the DC side of the multi-port microgrid networking equipment is charged; when the net power value is zero... When the value is not greater than zero, the AC load port 2 on the AC side of the multi-port microgrid networking equipment is powered by the energy storage port 3 on the AC side of the multi-port microgrid networking equipment, and no power distribution is performed.

[0076] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed.

[0077] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, calculate the net power between the photovoltaic port 5 and the DC load port 7 on the DC side of the multi-port microgrid networking equipment. When the net power value When the power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to supply the AC load port 2 of the AC side of the multi-port microgrid networking equipment; when the net power is... When the value is not greater than zero, power allocation is not performed.

[0078] like Figure 6 As shown, the second allocation strategy is as follows:

[0079] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, the DC side of the multi-port microgrid networking equipment supplies power to the AC load port 2 on the AC side of the multi-port microgrid networking equipment and charges the AC energy storage port 3 on the AC side.

[0080] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed.

[0081] When the AC power port 4 on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, calculate the net power between the photovoltaic port 5 and the DC load port 7 on the DC side of the multi-port microgrid networking equipment. When the net power value When the power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment and to charge the AC energy storage port 3; when the net power value is zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment and to charge the AC energy storage port 3. When the value is not greater than zero, power allocation is not performed.

[0082] Step 5: When the element connected to port 3 on the AC side of the multi-port microgrid networking equipment is an energy storage module, and the AC power port 1 on the AC side of the multi-port microgrid networking equipment is in normal condition, the second control strategy is adopted for power optimization. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port 5 on the DC side of the multi-port microgrid networking equipment according to priority.

[0083] like Figure 7 As shown, the second control strategy is specifically as follows:

[0084] Calculate the net power between the photovoltaic port 5 and the DC load port 7 on the DC side of the multi-port microgrid networking equipment. ;

[0085] When the net power value When the value is greater than zero, determine whether the energy storage port 6 on the DC side of the multi-port microgrid networking equipment has a charging margin.

[0086] When the DC-side energy storage port 6 has a charging margin, the remaining photovoltaic power is used to charge the device connected to the energy storage port 6. If there is still remaining photovoltaic power after the device connected to the energy storage port 6 is fully charged, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after powering the AC load port 2 on the AC side, it is determined whether the AC-side energy storage port 3 has a charging margin. If the AC-side energy storage port 3 has a charging margin, energy storage charging is performed on the AC-side energy storage port 3.

[0087] When the DC-side energy storage port 6 has no charging margin, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after powering the AC load port 2 on the AC side, it is determined whether the AC-side energy storage port 3 has a charging margin. If the AC-side energy storage port 3 has a charging margin, energy storage charging is performed on the AC-side energy storage port 3.

[0088] When the net power value If the value is not greater than zero, power allocation will not be performed.

[0089] Step 6: When the element connected to port 3 is a photovoltaic module, and the AC power port 1 on the AC side of the multi-port microgrid networking equipment is in normal condition, a third control strategy is adopted for power optimization. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port 3 and the DC side photovoltaic port 5 in the multi-port microgrid networking equipment.

[0090] like Figure 8 As shown, the third control strategy is specifically as follows:

[0091] Calculate the net power between the photovoltaic port 3 and the AC load port 2 on the AC side of the multi-port microgrid networking equipment to obtain the first net power value. ;

[0092] Calculate the net power between the photovoltaic port 5 and the DC load port 7 on the DC side of the multi-port microgrid networking equipment to obtain the second net power value. ;

[0093] When the first power net value and the second net power value When all values ​​are greater than zero, determine whether the DC-side energy storage port 6 in the multi-port microgrid networking equipment has a charging margin. If the DC-side energy storage port 6 has a charging margin, then charge the equipment connected to the DC-side energy storage port 6.

[0094] When the first power net value Greater than zero, and the second net power value When the value is not greater than zero, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power on the AC side of the multi-port microgrid networking equipment to the DC load port 7 on the DC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the DC load port 7 on the DC side, it is determined whether the energy storage port 6 on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port 6 on the DC side has a charging margin, the remaining photovoltaic power is used to charge the equipment connected to the energy storage port 6 on the DC side.

[0095] When the first power net value Not greater than zero, and the second net power value When the value is greater than zero, it is determined whether there is a charging margin in the DC side energy storage port 6 of the multi-port microgrid networking equipment. If there is a charging margin in the DC side energy storage port 6, the remaining photovoltaic power on the DC side of the multi-port microgrid networking equipment is used to charge the equipment connected to the DC side energy storage port 6. If there is still remaining photovoltaic power after charging the equipment connected to the DC side energy storage port 6, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power to the AC side of the multi-port microgrid networking equipment to power the AC load port 2 on the AC side of the multi-port microgrid networking equipment.

[0096] When the first power net value and the second net power value If none of the values ​​are greater than zero, then power allocation will not be performed.

[0097] Step 7: When the element connected to port 3 is a photovoltaic module, and the AC power port 1 on the AC side of the multi-port microgrid networking equipment is out of power, the distributed photovoltaic system actively prevents islanding and does not perform any power allocation.

[0098] Therefore, this implementation method, through real-time calculation of the net power value of distributed power sources and load ports and identification of port operating modes, dynamically adjusts interconnection power, power supply paths, and equipment start-up and shutdown techniques. This achieves optimized power control and stable, efficient operation of the microgrid integrated machine under various multi-element access conditions. Simultaneously, by calculating the remaining photovoltaic power through the net port power value, it clarifies the priority of transferring remaining photovoltaic power from local microgrid energy storage charging to cross-microgrid load supply and cross-microgrid energy storage charging. For AC power outage scenarios, it clearly adopts a response logic from energy storage startup to cross-microgrid power mutual assistance, thereby improving the renewable energy absorption rate and reducing curtailment.

[0099] The second embodiment of the present invention relates to a power optimization control device for multi-port microgrid networking equipment, comprising:

[0100] The access status determination module is used to determine the access status of the distributed energy ports on the AC side in a multi-port microgrid networking device.

[0101] The first execution module is used to adopt a control strategy of mutual backup power supply between AC and DC microgrids when there are no connected elements on the distributed energy port of the AC side in the multi-port microgrid networking equipment.

[0102] The access element determination module is used to determine the type of the access element when there is an access element on the distributed energy port on the AC side of the multi-port microgrid networking equipment.

[0103] The second execution module is used to perform power optimization using a first control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment.

[0104] The third execution module is used to perform power optimization by adopting a second control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port on the DC side of the multi-port microgrid networking equipment according to priority.

[0105] The fourth execution module is used to perform power optimization using a third control strategy when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port and the DC side photovoltaic port in the multi-port microgrid networking equipment.

[0106] The fifth execution module is used to not perform any power allocation when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized.

[0107] The control strategy for the AC / DC microgrid mutual backup power supply is as follows:

[0108] When the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start in Vf mode, and the AC load port on the AC side of the multi-port microgrid networking equipment is powered by the DC side of the multi-port microgrid networking equipment.

[0109] When the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start fault transfer, so that the AC side of the multi-port microgrid networking equipment supplies power to the DC load port on the DC side of the multi-port microgrid networking equipment.

[0110] The first control strategy is as follows:

[0111] When the state of charge of the energy storage module is greater than the state of charge limit, a first allocation strategy is adopted according to the operating mode of the AC power port on the DC side of the multi-port microgrid networking equipment. The first allocation strategy is used to prioritize the consumption of surplus photovoltaic power.

[0112] When the state of charge of the energy storage module is not greater than the state of charge limit, a second allocation strategy is adopted according to the operating mode of the AC power supply port on the DC side of the multi-port microgrid networking equipment. The second allocation strategy is used to restore the power of the AC side energy storage port while ensuring the AC load port on the AC side of the multi-port microgrid networking equipment.

[0113] The first allocation strategy is as follows:

[0114] When the AC power port on the DC side of the multi-port microgrid network device operates in UdcQ mode, the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid network device is calculated. When the net power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid network device through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid network device. If the photovoltaic power is still not fully utilized at this time, the energy storage port on the DC side of the multi-port microgrid network device is charged. When the net power is not greater than zero, the AC load port on the AC side of the multi-port microgrid network device is powered by the energy storage port on the AC side, and power distribution is not performed.

[0115] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed;

[0116] When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment. When the net power value is not greater than zero, power allocation is not performed.

[0117] The second allocation strategy is as follows:

[0118] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in UdcQ mode, the DC side of the multi-port microgrid networking equipment supplies power to the AC load port on the AC side of the multi-port microgrid networking equipment and charges the energy storage port on the AC side of the multi-port microgrid networking equipment.

[0119] When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in Vf mode, power regulation is not performed;

[0120] When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in UdcQ mode and not operating in Vf mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment and to charge the energy storage port on the AC side. When the net power value is not greater than zero, power dispatch is not performed.

[0121] The second control strategy is as follows:

[0122] Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment;

[0123] When the net power value is greater than zero, determine whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin.

[0124] When the DC-side energy storage port has a charging margin, the remaining photovoltaic power is used to charge the devices connected to the energy storage port. If there is still remaining photovoltaic power after the devices connected to the energy storage port are fully charged, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load ports on the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after powering the AC load ports on the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port.

[0125] When the DC-side energy storage port has no charging margin, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load port of the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the AC load port of the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port.

[0126] Power allocation will not be performed if the net power value is not greater than zero.

[0127] The third control strategy is specifically as follows:

[0128] Calculate the net power between the photovoltaic port and the AC load port on the AC side of the multi-port microgrid networking equipment to obtain the first net power value;

[0129] Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment to obtain the second net power value;

[0130] When both the first net power value and the second net power value are greater than zero, it is determined whether the DC-side energy storage port in the multi-port microgrid networking equipment has a charging margin. If the DC-side energy storage port has a charging margin, the equipment connected to the DC-side energy storage port is charged.

[0131] When the first net power value is greater than zero and the second net power value is not greater than zero, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power on the AC side of the multi-port microgrid networking equipment to the DC load port on the DC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the DC load port on the DC side, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power is used to charge the equipment connected to the energy storage port on the DC side.

[0132] When the first net power value is not greater than zero and the second net power value is greater than zero, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power on the DC side of the multi-port microgrid networking equipment is used to charge the equipment connected to the energy storage port on the DC side. If there is still remaining photovoltaic power after charging the equipment connected to the energy storage port on the DC side, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power to the AC side of the multi-port microgrid networking equipment to power the AC load port on the AC side of the multi-port microgrid networking equipment.

[0133] Power allocation is not performed when both the first net power value and the second net power value are not greater than zero.

[0134] The third embodiment of the present invention relates to an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the power optimization control method for multi-port microgrid networking equipment of the first embodiment.

[0135] The fourth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the power optimization control method for multi-port microgrid networking equipment of the first embodiment.

[0136] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0137] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction methods implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0139] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0140] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-port microgrid networking device power optimization control method, characterized in that, Includes the following steps: Determine the access status of the distributed energy ports on the AC side in a multi-port microgrid networking device; When there are no connected elements on the AC side of the distributed energy port in the multi-port microgrid networking equipment, a control strategy of mutual backup power supply between AC and DC microgrids is adopted. When there is an access element on the AC side of the distributed energy port in the multi-port microgrid networking equipment, determine the type of the access element; When the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power, a first control strategy is adopted for power optimization. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment. When the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, a second control strategy is adopted for power optimization. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port on the DC side of the multi-port microgrid networking equipment according to priority. When the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, a third control strategy is adopted for power optimization. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port and the DC side photovoltaic port in the multi-port microgrid networking equipment. When the access element is a photovoltaic module, and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power, no power allocation is performed.

2. The multi-port microgrid networking device power optimization control method of claim 1, wherein, The control strategy for the AC / DC microgrid mutual backup power supply is as follows: When the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in DC voltage reactive mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start in voltage frequency mode, so that the AC load port on the AC side of the multi-port microgrid networking equipment is powered by the DC side of the multi-port microgrid networking equipment. When the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition, and the AC power port on the DC side of the multi-port microgrid networking equipment is operating in voltage-frequency mode, the interconnection ACDC module in the multi-port microgrid networking equipment is controlled to start fault transfer, so that the AC side of the multi-port microgrid networking equipment supplies power to the DC load port on the DC side of the multi-port microgrid networking equipment.

3. The multi-port microgrid networking device power optimization control method of claim 1, wherein, The first control strategy is as follows: When the state of charge of the energy storage module is greater than the state of charge limit, a first allocation strategy is adopted according to the operating mode of the AC power port on the DC side of the multi-port microgrid networking equipment. The first allocation strategy is used to prioritize the consumption of surplus photovoltaic power. When the state of charge of the energy storage module is not greater than the state of charge limit, a second allocation strategy is adopted according to the operating mode of the AC power supply port on the DC side of the multi-port microgrid networking equipment. The second allocation strategy is used to restore the power of the AC side energy storage port while ensuring the AC load port on the AC side of the multi-port microgrid networking equipment.

4. The power optimization control method for multi-port microgrid networking equipment according to claim 3, characterized in that, The first allocation strategy is as follows: When the AC power port on the DC side of the multi-port microgrid network device operates in DC voltage reactive mode, the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid network device is calculated. When the net power is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid network device through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid network device. If the photovoltaic power is still not fully utilized at this time, the energy storage port on the DC side of the multi-port microgrid network device is charged. When the net power is not greater than zero, the AC load port on the AC side of the multi-port microgrid network device is powered by the energy storage port on the AC side, and no power distribution is performed. When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in voltage-frequency mode, power regulation is not performed. When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in DC voltage reactive mode and not operating in voltage frequency mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment. When the net power value is not greater than zero, power allocation is not performed.

5. The power optimization control method for multi-port microgrid networking equipment according to claim 3, characterized in that, The second allocation strategy is as follows: When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in DC voltage reactive mode, the DC side of the multi-port microgrid networking equipment supplies power to the AC load port on the AC side of the multi-port microgrid networking equipment and charges the energy storage port on the AC side of the multi-port microgrid networking equipment. When the AC power port on the DC side of the multi-port microgrid networking equipment is operating in voltage-frequency mode, power regulation is not performed. When the AC power port on the DC side of the multi-port microgrid networking equipment is not operating in DC voltage reactive mode and not operating in voltage frequency mode, the net power value between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment is calculated. When the net power value is greater than zero, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module to power the AC load port on the AC side of the multi-port microgrid networking equipment and to charge the energy storage port on the AC side. When the net power value is not greater than zero, power dispatch is not performed.

6. The power optimization control method for multi-port microgrid networking equipment according to claim 1, characterized in that, The second control strategy is as follows: Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment; When the net power value is greater than zero, determine whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. When the DC-side energy storage port has a charging margin, the remaining photovoltaic power is used to charge the devices connected to the energy storage port. If there is still remaining photovoltaic power after the devices connected to the energy storage port are fully charged, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load ports on the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after powering the AC load ports on the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port. When the DC-side energy storage port has no charging margin, the remaining photovoltaic power is transferred to the AC side of the multi-port microgrid networking equipment through the interconnection ACDC module in the multi-port microgrid networking equipment to power the AC load port of the AC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the AC load port of the AC side, it is determined whether the AC-side energy storage port has a charging margin. If the AC-side energy storage port has a charging margin, energy storage charging is performed on the AC-side energy storage port. Power allocation will not be performed if the net power value is not greater than zero.

7. The power optimization control method for multi-port microgrid networking equipment according to claim 1, characterized in that, The third control strategy is specifically as follows: Calculate the net power between the photovoltaic port and the AC load port on the AC side of the multi-port microgrid networking equipment to obtain the first net power value; Calculate the net power between the photovoltaic port and the DC load port on the DC side of the multi-port microgrid networking equipment to obtain the second net power value; When both the first net power value and the second net power value are greater than zero, it is determined whether the DC-side energy storage port in the multi-port microgrid networking equipment has a charging margin. If the DC-side energy storage port has a charging margin, the equipment connected to the DC-side energy storage port is charged. When the first net power value is greater than zero and the second net power value is not greater than zero, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power on the AC side of the multi-port microgrid networking equipment to the DC load port on the DC side of the multi-port microgrid networking equipment. If there is still remaining photovoltaic power after supplying the DC load port on the DC side, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power is used to charge the equipment connected to the energy storage port on the DC side. When the first net power value is not greater than zero and the second net power value is greater than zero, it is determined whether the energy storage port on the DC side of the multi-port microgrid networking equipment has a charging margin. If the energy storage port on the DC side has a charging margin, the remaining photovoltaic power on the DC side of the multi-port microgrid networking equipment is used to charge the equipment connected to the energy storage port on the DC side. If there is still remaining photovoltaic power after charging the equipment connected to the energy storage port on the DC side, the interconnection ACDC module in the multi-port microgrid networking equipment is activated to transfer the remaining photovoltaic power to the AC side of the multi-port microgrid networking equipment to power the AC load port on the AC side of the multi-port microgrid networking equipment. Power allocation is not performed when both the first net power value and the second net power value are not greater than zero.

8. A power optimization control device for multi-port microgrid networking equipment, characterized in that, include: The access status determination module is used to determine the access status of the distributed energy ports on the AC side in a multi-port microgrid networking device. The first execution module is used to adopt a control strategy of mutual backup power supply between AC and DC microgrids when there are no connected elements on the distributed energy port of the AC side in the multi-port microgrid networking equipment. The access element determination module is used to determine the type of the access element when there is an access element on the distributed energy port on the AC side of the multi-port microgrid networking equipment. The second execution module is used to perform power optimization using a first control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is out of power. The first control strategy is used to ensure power supply to the AC load port on the AC side of the multi-port microgrid networking equipment. The third execution module is used to perform power optimization by adopting a second control strategy when the access element is an energy storage module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The second control strategy is used to allocate and consume the photovoltaic power of the photovoltaic port on the DC side of the multi-port microgrid networking equipment according to priority. The fourth execution module is used to perform power optimization using a third control strategy when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is in normal condition. The third control strategy is used to absorb the photovoltaic power of the AC side distributed energy port and the DC side photovoltaic port in the multi-port microgrid networking equipment. The fifth execution module is used to not perform any power allocation when the access element is a photovoltaic module and the AC power port on the AC side of the multi-port microgrid networking equipment is de-energized.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the power optimization control method for multi-port microgrid networking equipment as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the power optimization control method for multi-port microgrid networking equipment as described in any one of claims 1-7.

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