Method and device for adjusting power factor of micro-grid based on reactive power

Abstract

The present application relates to the technical field of power grid control, and discloses a method and device for adjusting micro-grid power factor based on reactive power, which is based on active power in the last statistical cycle, sent reactive power and absorbed reactive power to calculate the first real-time power factor according to the first formula; if the first real-time power factor is less than the first preset standard power factor, the corresponding reactive power to be adjusted of all photovoltaic inverters is calculated according to the second formula based on the real-time reactive power, the preset safety factor and the rated power of all photovoltaic inverters; and the reactive power of the photovoltaic inverters is controlled to be sent to the power grid according to the preset working time of the day based on the reactive power to be adjusted. The reactive power output of the photovoltaic inverters is controlled according to the reactive power to be adjusted and the preset working time of the day, so that the power factor is effectively improved at a low cost, and the power factor can meet the standard requirements.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, specifically to a method and apparatus for adjusting the power factor of a microgrid based on reactive power. Background Technology

[0002] Currently, the power grid system has the authority to assess the power factor of electricity-consuming enterprises. The overall power factor must not be lower than 0.9; otherwise, the enterprise will face fines. Improving the power factor relies on hardware facilities such as SVG (Static Var Generator) and capacitor compensation cabinets, with different capacities of equipment installed based on electricity demand forecasts. In the past, industrial and commercial loads were mainly inductive, so using SVG and similar equipment could effectively solve the power factor problem. However, with the development of photovoltaic, energy storage, and charging services, the introduction of capacitive loads has increased the uncertainty of enterprise electricity consumption, and simply using SVG and similar equipment may not be able to solve all the problems.

[0003] Furthermore, some energy users may consider expanding their distributed photovoltaic (PV) power plants to address power factor issues. Existing capacitor compensation equipment may only be configured for past power consumption, lacking compatibility and unable to adapt to new situations. Moreover, the investment costs of equipment such as SVG (Static Var Generator) and capacitor compensation cabinets are relatively high, which some industrial and commercial power users may not be able to afford. Additionally, there may not be sufficient space to install the additional equipment, as SVG and capacitor compensation cabinets require specific locations, and space constraints may prevent the introduction of these devices. Summary of the Invention

[0004] In view of this, the present invention provides a method for adjusting the power factor of a microgrid based on reactive power, in order to solve the problem of how to effectively improve the power factor at a lower cost.

[0005] In a first aspect, the present invention provides a method for adjusting the power factor of a microgrid based on reactive power. The method includes: acquiring the active power drawn from the grid, the reactive power transmitted, the reactive power absorbed, and the real-time reactive power in the previous statistical period; calculating a first real-time power factor according to a first formula based on the active power drawn from the grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period; if the first real-time power factor is less than a first preset standard power factor, calculating the reactive power to be adjusted corresponding to all photovoltaic inverters according to a second formula based on the real-time reactive power, a preset safety factor, and the rated power of all photovoltaic inverters; and controlling multiple photovoltaic inverters to transmit reactive power to the grid according to a preset working time of the current statistical period based on the reactive power to be adjusted.

[0006] This invention, through obtaining the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in a statistical period at the power gateway location, effectively reduces costs by eliminating the need for equipment such as SVG (Static Var Generator) and capacitor compensation cabinets. A first real-time power factor is calculated. If the first real-time power factor does not reach the preset standard power factor (State Grid standard), the reactive power to be adjusted for all photovoltaic inverters is calculated according to a second formula based on the real-time reactive power, a preset safety factor, and the rated power of all photovoltaic inverters. The preset safety factor in the data calculation prevents the transmitted power from exceeding the rated power of the photovoltaic inverters, ensuring normal equipment operation and avoiding a reduction in photovoltaic power generation efficiency due to power factor adjustment. By controlling the reactive power output of the photovoltaic inverters according to the preset working time of the current statistical period using the reactive power to be adjusted, the power factor is effectively improved at a lower cost, ensuring that the power factor meets the standard requirements.

[0007] In one alternative implementation, the first formula is:

[0008]

[0009] Where γ is the real-time power factor, Δep grid For active power, ΔeReactive grid To transmit reactive power, ΔepReactive grid To absorb reactive power.

[0010] By using the first formula, the real-time power factor can be calculated based on active power, reactive power transmitted, and reactive power absorbed, providing a data basis for whether to initiate power factor adjustment in the future.

[0011] In one alternative implementation, the second formula is:

[0012]

[0013] Where, q instruction For the reactive power to be adjusted, q grid η is the real-time reactive power, η is the preset safety factor, and q is the reactive power. rate,i Let be the rated power of the i-th photovoltaic inverter, and n be the number of photovoltaic inverters.

[0014] This invention uses a second formula to obtain the smaller of the real-time reactive power measured by the meter and the rated power of multiple photovoltaic inverters, thus more accurately determining the reactive power to be adjusted. At the same time, a safety factor is defined to prevent the reactive power subsequently issued from exceeding the rated power of the photovoltaic inverter, ensuring the normal operation of the equipment, avoiding reactive power overcompensation, and preventing the reduction of photovoltaic power generation efficiency due to power factor adjustment. This provides a data basis for subsequent control of the photovoltaic inverter's power output.

[0015] In one optional implementation, controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to a preset working time of the current statistical period includes: based on the reactive power to be adjusted q instruction The first output power ratio pmt1 is calculated based on the preset damping coefficient c and the rated power of n photovoltaic inverters according to the following third formula;

[0016]

[0017] If the first power distribution ratio is greater than or equal to a preset ratio, then the first power distribution ratio is used as the target power ratio to generate a control command. Based on the control command, the n photovoltaic inverters are controlled to distribute reactive power to the grid according to the preset working time of the current statistical period. If the first power distribution ratio is less than the preset ratio, then at least j photovoltaic inverters are removed from the n photovoltaic inverters, based on the reactive power q to be adjusted. instruction The second power output ratio pmt2 is calculated based on the preset damping coefficient c and the rated power of nj photovoltaic inverters according to the following fourth formula.

[0018]

[0019] Wherein, the value of j ensures that the second power transmission ratio is greater than or equal to the preset ratio; the second power transmission ratio is used as the target power ratio to generate control instructions, and based on the control instructions, the nj photovoltaic inverters are controlled to transmit reactive power to the grid according to the preset working time of the current statistical period.

[0020] In this embodiment of the invention, the first power output ratio is calculated using a third formula, and it is determined whether the ratio is greater than or equal to a preset ratio. If the ratio is less than the preset ratio, the number of devices is gradually reduced and the adjusted reactive power is recalculated to gradually increase the proportion of reactive power output by each inverter to the rated power, so that it reaches the preset ratio. This ensures that the photovoltaic inverter operates within a more suitable power range, avoiding the zero-drift phenomenon of the photovoltaic inverter due to low power operation. At the same time, a damping coefficient is introduced to further avoid the power overcompensation phenomenon caused by the time difference between data acquisition and power output.

[0021] In one optional implementation, after the step of controlling the photovoltaic inverter to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: obtaining the active power, reactive power sent, and reactive power absorbed by the grid at the current time of the current statistical period; calculating a second real-time power factor according to a first formula based on the active power, reactive power sent, and reactive power absorbed by the grid at the current time of the current statistical period; if the second real-time power factor is greater than the second preset standard power factor, then controlling at least one photovoltaic inverter to stop sending reactive power to the grid at the current time.

[0022] In this embodiment of the invention, after controlling the inverter to distribute power, a second real-time power factor is obtained again based on the first formula. It is then determined whether the second real-time power factor exceeds the maximum second preset standard power factor. If it exceeds the second preset standard power factor, the reactive power compensation operation of at least one inverter is terminated until the power factor drops below the second preset standard power factor. This effectively avoids overcompensation in the system and ensures reasonable reactive power compensation.

[0023] In an optional implementation, before the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: taking the time interval from the first hour after sunrise to the last hour before sunset as the equipment working time interval; dividing the equipment working time interval into multiple time units, and setting the start time corresponding to each time unit as the preset working time.

[0024] In this embodiment of the invention, the photovoltaic inverter is a device that converts solar energy into electrical energy. During the period from sunrise to sunset, the solar radiation intensity is relatively high, and the power generation efficiency of the photovoltaic inverter is also relatively high. By setting this period as the device's working time interval, dividing the device's working time interval into multiple time units, and setting preset working times, the operating time of the photovoltaic inverter can be optimized, thereby improving the efficiency of the photovoltaic inverter's power output.

[0025] In one optional implementation, after the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to a preset working time of the current statistical period, the method further includes: real-time monitoring of the reactive power direction at the current moment of the current statistical period; if the reactive power direction changes, then controlling all photovoltaic inverters to stop sending reactive power to the grid at the current moment, and continuing to control the multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted at the next preset working time of the current moment.

[0026] In this embodiment of the invention, the change in the direction of reactive power may cause fluctuations in voltage and current in the power grid, which may lead to damage to the inverter equipment or, after compensation has been performed, generate more reactive power loss. By stopping operation and delaying control until the next preset operating time, the inverter is ensured to restart operation in a stable state to maintain the safe and stable operation of the power grid, thereby effectively avoiding more reactive power loss.

[0027] In an optional implementation, after the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to a preset working time of the current statistical period, the method further includes:

[0028] Get the active power Δep at the current moment of the current statistical period. grid ΔeReactive power is sent up. grid ΔepReactive power absorption grid And combined with the preset target power factor pf target The target reactive power Q is calculated according to the fifth formula below;

[0029]

[0030] Get the sum of compensated reactive power Q from multiple time units prior to the current moment in the current statistical period. t If the sum of the compensated reactive power is Q t If the reactive power is less than the target reactive power Q, and the current time is within the equipment's operating time interval, then the multiple photovoltaic inverters will continue to send reactive power to the grid according to the next preset operating time based on the reactive power to be adjusted.

[0031] This invention determines whether the target power is exceeded by obtaining the compensated reactive power and restricts the reactive power adjustment process within the equipment's operating time range, minimizing the impact of the external environment on the power grid operation. During this time period, the output power of the photovoltaic power generation system is relatively stable, and the photovoltaic inverter is adjusted uniformly and stably to send reactive power to the power grid according to the preset operating time, thereby efficiently compensating the reactive power of the power grid and ensuring the stable operation of the power grid.

[0032] Secondly, the present invention provides a device for adjusting the power factor of a microgrid based on reactive power, the device comprising:

[0033] The data acquisition module is used to obtain the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in the previous statistical period.

[0034] The power factor calculation module is used to calculate the first real-time power factor based on the active power taken from the power grid, the reactive power sent up, and the reactive power absorbed in the previous statistical period, according to the first formula.

[0035] The power acquisition module is used to calculate the reactive power to be adjusted for all photovoltaic inverters based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, according to the second formula if the first real-time power factor is less than the first preset standard power factor.

[0036] The control module is used to control multiple photovoltaic inverters to send reactive power to the power grid based on the reactive power to be adjusted and according to the preset working time of the current statistical period.

[0037] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for adjusting the power factor of a microgrid based on reactive power as described in the first aspect or any corresponding embodiment.

[0038] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the method for adjusting the power factor of a microgrid based on reactive power as described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating a method for adjusting the power factor of a microgrid based on reactive power, according to an embodiment of the present invention.

[0041] Figure 2 This is a flowchart illustrating another method for adjusting the power factor of a microgrid based on reactive power according to an embodiment of the present invention;

[0042] Figure 3 This is a flowchart illustrating another method for adjusting the power factor of a microgrid based on reactive power according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the module composition of a microgrid power factor adjustment device based on reactive power according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] This invention provides an embodiment of a method for adjusting the power factor of a microgrid based on reactive power. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0047] This embodiment provides a method for adjusting the power factor of a microgrid based on reactive power, which can be used with the aforementioned computer equipment. Figure 1 This is a flowchart of a microgrid power factor adjustment method based on reactive power according to an embodiment of the present invention, as shown below. Figure 1 As shown, the process includes the following steps:

[0048] Step S101: Obtain the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid taken from it in the previous statistical period.

[0049] It should be noted that the active power taken from the grid, reactive power transmitted to the grid, reactive power absorbed by the grid, and real-time reactive power in the previous statistical period refer to the data measured from the beginning of the month to the day before the current date (the previous statistical period). Active power refers to the measured electrical energy actually consumed by the grid; reactive power transmitted to the grid refers to the measured reactive energy transmitted to the grid; and reactive power absorbed by the grid refers to the measured reactive energy absorbed by the grid. Real-time reactive power refers to the reactive power at the grid inlet.

[0050] It is understood that this embodiment directly obtains active power, reactive power transmitted, reactive power absorbed, and real-time reactive power by utilizing the difference in readings of the energy meters at the power grid gateway, without relying on equipment such as SVG (Static Var Generator) and capacitor compensation cabinets, thereby effectively reducing costs. In this embodiment of the invention, the energy meter readings include at least: meter number; data upload time; cumulative active energy transmitted to the grid; active energy absorbed from the grid; reactive energy transmitted to the grid; active power absorbed from the grid; reactive power; real-time power factor, etc.; the inverter readings include at least: the inverter's active power; the inverter's reactive power; the reactive energy generated by the inverter; the reactive energy absorbed by the inverter, etc.

[0051] For example, if the electricity meter reading at the beginning of the month is A, and the reading on the previous day is B, then the electricity drawn from the grid on the previous day is obtained through the difference in readings (BA) to calculate the active power, reactive power sent up, or reactive power absorbed. Real-time reactive power, on the other hand, needs to be calculated based on time intervals by continuously monitoring the changes in the readings of the electricity meter at the grid gateway.

[0052] Step S102: Based on the active power drawn from the power grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, the first real-time power factor is calculated according to the first formula.

[0053] It should be noted that the power factor is the ratio of active power to apparent power in an AC circuit. In AC circuits, current and voltage are not necessarily in phase, resulting in active power and apparent power not completely coinciding. Therefore, the power factor is used to represent the effective utilization of electrical power, and its value ranges from 0 to 1. The first real-time power factor refers to the effective utilization of the grid's electrical energy in the current real time; for example, the first real-time power factor is 0.9, 0.88, etc.

[0054] Specifically, the first formula is:

[0055]

[0056] Where γ is the real-time power factor, Δep grid For active power, ΔeReactive grid To transmit reactive power, ΔepReactive grid To absorb reactive power.

[0057] By using the first formula, the real-time power factor can be calculated based on the active power drawn from the power grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, providing a data basis for whether to initiate power factor adjustment in the future.

[0058] Step S103: If the first real-time power factor is less than the first preset standard power factor, then based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, the reactive power to be adjusted corresponding to all photovoltaic inverters is calculated according to the second formula.

[0059] It should be noted that the first preset standard power factor refers to the State Grid's power factor requirement standard, set at 0.9, which is the target power factor to be achieved. The preset safety factor is a coefficient less than 1 and greater than 0. This coefficient limits the adjustable reactive power of the inverter. The specific value of the preset safety factor is an empirical value derived from multiple experiments and operations.

[0060] It is understandable that adjusting the output of the photovoltaic inverter can improve the power factor to meet the State Grid's requirements, thereby ensuring the stable operation of the power grid system. Based on the relationship between apparent power (s), active power (p), and reactive power (q), the following formula can be used to describe this:

[0061] p 2 +q 2 =s 2 ;

[0062] The formula shows that in practice, the maximum apparent power of the inverter is fixed. Therefore, a safety factor is needed to limit the adjustable reactive power of the inverter, so as to ensure that the photovoltaic power generation efficiency will not be reduced due to power factor adjustment.

[0063] Specifically, the second formula is:

[0064]

[0065] Where, q instruction For the reactive power to be adjusted, q grid η is the real-time reactive power, η is the preset safety factor, and q is the reactive power. rate,i Let be the rated power of the i-th photovoltaic inverter, and n be the number of photovoltaic inverters.

[0066] This invention uses a second formula to obtain the smaller of the real-time reactive power measured by the meter and the rated power of multiple photovoltaic inverters, thus more accurately determining the reactive power to be adjusted. At the same time, a safety factor is defined to prevent the reactive power subsequently issued from exceeding the rated power of the photovoltaic inverter, ensuring the normal operation of the equipment, avoiding reactive power overcompensation, and preventing the reduction of photovoltaic power generation efficiency due to power factor adjustment. This provides a data basis for subsequent control of the photovoltaic inverter's power output.

[0067] Step S104: Based on the reactive power to be adjusted, control multiple photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period.

[0068] It should be noted that the current statistical period refers to the period before the inverter has been controlled to operate. For example, if January 1st was the previous statistical period, then January 2nd is the current statistical period. Photovoltaic inverters can be set with multiple preset operating times, performing different or the same operations at different preset operating times. For example, an inverter can perform reactive power distribution operations at 10:00, 11:00, and 12:00 based on control commands. Each reactive power distribution time interval is one hour, during which no other operations can be performed. If the control command needs to be changed, it needs to be changed at the next preset operating time after 12:00. This ensures stable grid operation while allowing for flexible adjustment of the inverter's operation.

[0069] This invention, through obtaining the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in a statistical period at the power gateway location, effectively reduces costs by eliminating the need for equipment such as SVG (Static Var Generator) and capacitor compensation cabinets. A first real-time power factor is calculated. If the first real-time power factor does not reach the preset standard power factor (State Grid standard), the reactive power to be adjusted for all photovoltaic inverters is calculated according to a second formula based on the real-time reactive power, a preset safety factor, and the rated power of all photovoltaic inverters. The preset safety factor in the data calculation prevents the transmitted power from exceeding the rated power of the photovoltaic inverters, ensuring normal equipment operation and avoiding a reduction in photovoltaic power generation efficiency due to power factor adjustment. By controlling the reactive power output of the photovoltaic inverters according to the preset working time of the current statistical period using the reactive power to be adjusted, the power factor is effectively improved at a lower cost, ensuring that the power factor meets the standard requirements.

[0070] This embodiment provides a method for adjusting the power factor of a microgrid based on reactive power, which can be used in the aforementioned computers, etc. Figure 2 This is a flowchart of a microgrid power factor adjustment method based on reactive power according to an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps:

[0071] Step S201: Obtain the active power drawn from the power grid, the reactive power transmitted, the reactive power absorbed, and the real-time reactive power for the previous statistical period. For details, please refer to [link to relevant documentation]. Figure 1 Step S101 of the illustrated embodiment will not be described again here.

[0072] Step S202: Based on the active power drawn from the grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, the first real-time power factor is calculated according to the first formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0073] Step S203: If the first real-time power factor is less than the first preset standard power factor, then based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, the reactive power to be adjusted for all photovoltaic inverters is calculated according to the second formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0074] Step S204: Based on the reactive power to be adjusted, control multiple photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period.

[0075] Specifically, step S204 above includes:

[0076] a1: Based on the reactive power to be adjusted q instruction The first output power ratio pmt1 is calculated based on the preset damping coefficient c and the rated power of n photovoltaic inverters according to the following third formula;

[0077]

[0078] It should be noted that the damping coefficient refers to an empirical value obtained from multiple experiments or a value obtained by training a machine learning model. Setting a damping coefficient can prevent overcompensation caused by the time difference between data acquisition and transmission.

[0079] For example, if the reactive power to be adjusted is 100kW, the preset damping coefficient is 0.9, and there are 3 photovoltaic inverters with rated powers of 70kW, 80kW and 90kW respectively, the first power output ratio is calculated to be 0.38 according to the third formula.

[0080] a2: If the first power ratio is greater than or equal to the preset ratio, then the first power ratio is used as the target power ratio to generate a control command. Based on the control command, n photovoltaic inverters are controlled to send reactive power to the grid according to the preset working time of the current statistical period.

[0081] It should be noted that the preset ratio refers to the pre-set percentage of the inverter's rated power. If the reactive power delivered by the inverter is less than the preset percentage of the rated power, it will cause data drift, resulting in unstable operation of the inverter equipment. For example, if the calculated first power delivery ratio is 0.38, which is greater than the preset ratio of 0.1, then control 3 photovoltaic inverters to deliver reactive power to the grid.

[0082] a3: If the first power output ratio is less than the preset ratio, then remove at least j photovoltaic inverters from the n photovoltaic inverters; based on the reactive power q to be adjusted. instructionThe second power output ratio pmt2 is calculated based on the preset damping coefficient c and the rated power of nj photovoltaic inverters according to the following fourth formula.

[0083]

[0084] The value of j ensures that the second power ratio is greater than or equal to the preset ratio.

[0085] Understandably, if the reactive power ratio delivered by a photovoltaic inverter is less than 10% of the rated power of the photovoltaic inverter with the smallest rated power (preset ratio), it means that the adjustable reactive power threshold is set too low and reactive power regulation cannot be effectively carried out. At least one inverter needs to be removed to increase the target power ratio.

[0086] a4: Use the second power ratio as the target power ratio to generate control commands. Based on the control commands, control nj photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period.

[0087] For example, if the reactive power to be adjusted is 20kW, the preset damping coefficient is 0.9, and there are 3 photovoltaic inverters with rated powers of 70kW, 80kW and 90kW respectively, the first power transmission ratio calculated according to the third formula is 0.075, which is less than the preset ratio of 0.1. Randomly remove one inverter with a rated power of 70kW, recalculate the second power transmission ratio to be 0.11, and then control the two photovoltaic inverters with rated powers of 80kW and 90kW to transmit reactive power to the grid.

[0088] In this embodiment of the invention, the first power output ratio is calculated using a third formula, and it is determined whether the ratio is greater than or equal to a preset ratio. If the ratio is less than the preset ratio, the number of devices is gradually reduced and the adjusted reactive power is recalculated to gradually increase the proportion of reactive power output by each inverter to the rated power, so that it reaches the preset ratio. This ensures that the photovoltaic inverter operates within a more suitable power range, avoiding the zero-drift phenomenon of the photovoltaic inverter due to low power operation. At the same time, a damping coefficient is introduced to further avoid the power overcompensation phenomenon caused by the time difference between data acquisition and power output.

[0089] Step S205: Obtain the active power, reactive power transmitted, and reactive power absorbed by the power grid at the current moment of the current statistical period.

[0090] Understandably, after controlling multiple photovoltaic inverters to send reactive power to the grid based on the preset working time of the current statistical period according to the reactive power to be adjusted, the reading of the power meter at the gate position changes, and therefore the real-time power factor also changes. Therefore, it is necessary to obtain the active power, reactive power sent and absorbed by the grid at the current time of the current statistical period again in order to detect the second real-time power factor.

[0091] Step S206: Based on the active power drawn from the power grid, the reactive power transmitted, and the reactive power absorbed at the current moment of the current statistical period, the second real-time power factor is calculated according to the first formula.

[0092] For example, if at the current statistical period 14, the active power drawn from the grid is 1500kW, the reactive power sent up is 90kW, and the reactive power absorbed is 60kW, then the second real-time power factor obtained based on the first formula is 0.99.

[0093] Step S207: If the second real-time power factor is greater than the second preset standard power factor, then at least one photovoltaic inverter is controlled to stop sending reactive power to the grid at the current moment.

[0094] It should be noted that since the electricity consumption patterns of electricity users are difficult to determine, in order to ensure the stable operation of the entire system and prevent resonance, the power factor adjustment can only approach 1 and cannot be overcompensated. Therefore, a second preset standard power factor needs to be set to make it less than 1.

[0095] For example, if the second preset standard power factor is set to 0.98, and the second real-time power factor is obtained as 0.99 based on the first formula, which is greater than the second preset standard power factor, then at least one photovoltaic inverter will be controlled to stop sending reactive power to the grid at 14:00 on the same day until the second real-time power factor is lower than 0.98.

[0096] In this embodiment of the invention, after controlling the inverter to distribute power, a second real-time power factor is obtained again based on the first formula. It is then determined whether the second real-time power factor exceeds the maximum second preset standard power factor. If it exceeds the second preset standard power factor, the reactive power compensation operation of at least one inverter is terminated until the power factor drops below the second preset standard power factor. This effectively avoids overcompensation in the system, ensures reasonable reactive power compensation, and thus effectively improves the power factor.

[0097] This embodiment provides a method for adjusting the power factor of a microgrid based on reactive power, which can be used in the aforementioned computers, etc. Figure 3 This is a flowchart of a microgrid power factor adjustment method based on reactive power according to an embodiment of the present invention, as shown below. Figure 3 As shown, the process includes the following steps:

[0098] Step S301: Obtain the active power drawn from the power grid, the reactive power transmitted, the reactive power absorbed, and the real-time reactive power for the previous statistical period. For details, please refer to [link to relevant documentation]. Figure 1 Step S101 of the illustrated embodiment will not be described again here.

[0099] Step S302: Based on the active power drawn from the grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, the first real-time power factor is calculated according to the first formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0100] Step S303: If the first real-time power factor is less than the first preset standard power factor, then based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, the reactive power to be adjusted for all photovoltaic inverters is calculated according to the second formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0101] Step S304: The time interval from the first hour after sunrise to the last hour before sunset is taken as the equipment's working time interval.

[0102] For example, if sunrise is at 6:30 and sunset is at 18:30, then the device's operating time will be from 7:00 (the first hour after sunrise) to 18:00 (the last hour before sunset).

[0103] Step S305: Divide the device's working time interval into multiple time units, and set the start time of each time unit to a preset working time.

[0104] For example, the device's operating time range is from 7:00 to 18:00, which can be divided into 12 hours, with each hour as a time unit. If the preset operating time is the start time of each hour, then the preset operating time can be set to 7:00, 8:00, 9:00, etc. The control command can be changed within the preset operating time, and within the time unit, the inverter executes the command to complete the power distribution operation.

[0105] In this embodiment of the invention, the photovoltaic inverter is a device that converts the direct current (DC) power from solar cells into alternating current (AC). During the period from sunrise to sunset, the solar radiation intensity is relatively high, and the power generation efficiency of the photovoltaic inverter is also relatively high. Setting this period as the device's operating time interval, dividing it into multiple time units, and setting preset operating times can optimize the photovoltaic inverter's operating time, thereby improving the efficiency of its power output.

[0106] Step S306: Based on the reactive power to be adjusted, control multiple photovoltaic inverters to send reactive power to the grid according to the preset operating time of the current statistical period. For details, please refer to [link to relevant documentation]. Figure 1 Step S104 of the illustrated embodiment will not be described again here.

[0107] Step S307: Monitor the direction of reactive power at the current moment of the current statistical period in real time.

[0108] For example, if the current time is 10 o'clock, the direction of reactive power on the power grid is monitored in real time. The reactive power recorded by the energy meter at the switch position is represented by positive and negative numbers. After the reactive power changes, it will lead to reactive power overcompensation.

[0109] In step S308, if the direction of reactive power changes, all photovoltaic inverters are controlled to stop sending reactive power to the grid at the current moment, and at the next preset working moment, multiple photovoltaic inverters are controlled to send reactive power to the grid based on the reactive power to be adjusted.

[0110] For example, if a change in reactive power direction is detected at 10:00, meaning the system needs to switch from supplying reactive power to the grid to absorbing reactive power, the reversal of the reactive power direction indicates that the entire inverter is overcompensated. Therefore, the compensation behavior of all inverters needs to be stopped, and all photovoltaic inverters are immediately controlled to stop supplying reactive power to the grid. At the next preset operating time (e.g., 11:00), multiple photovoltaic inverters are again controlled to supply reactive power to the grid based on the reactive power to be adjusted. This avoids further reactive power loss after compensation has already occurred.

[0111] In this embodiment of the invention, the change in the direction of reactive power may cause fluctuations in voltage and current in the power grid, which may lead to damage to the inverter equipment or, after compensation has been performed, generate more reactive power loss. By stopping operation and delaying control until the next preset operating time, the inverter is ensured to restart operation in a stable state to maintain the safe and stable operation of the power grid, thereby effectively avoiding more reactive power loss and thus effectively improving the power factor.

[0112] This embodiment provides a method for adjusting the power factor of a microgrid based on reactive power, which can be used in the aforementioned computers, etc. The method includes the following steps:

[0113] Step S401: Obtain the active power drawn from the power grid, the reactive power transmitted, the reactive power absorbed, and the real-time reactive power for the previous statistical period. For details, please refer to [link to relevant documentation]. Figure 1 Step S101 of the illustrated embodiment will not be described again here.

[0114] Step S402: Based on the active power drawn from the grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, the first real-time power factor is calculated according to the first formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0115] Step S403: If the first real-time power factor is less than the first preset standard power factor, then based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, the reactive power to be adjusted for all photovoltaic inverters is calculated according to the second formula. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0116] Step S404: The time interval from the first hour after sunrise to the last hour before sunset is defined as the equipment's operating time interval. For details, please refer to [link to relevant documentation]. Figure 3 Step S304 of the illustrated embodiment will not be described again here.

[0117] Step S405: Divide the device's working time interval into multiple time units, and set the start time of each time unit to a preset working time. For details, please refer to [link to relevant documentation]. Figure 3 Step S305 of the illustrated embodiment will not be described again here.

[0118] Step S406: Based on the reactive power to be adjusted, control multiple photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period. For details, please refer to [link to relevant documentation]. Figure 1 Step S104 of the illustrated embodiment will not be described again here.

[0119] Step S407: Obtain the active power Δep at the current moment of the current statistical period. grid ΔeReactive power is sent up. grid ΔepReactive power absorption grid And combined with the preset target power factor pf target The target reactive power Q is calculated according to the fifth formula below;

[0120]

[0121] It should be noted that the preset target power factor refers to an expected standard set based on multiple experiments; it is an empirical value. The preset target power factor should be higher than the first preset standard power factor (e.g., the State Grid standard of 0.9) and lower than the second preset standard power factor (e.g., the maximum power factor limit of 0.98).

[0122] For example, a preset target power factor pf targetIf the value is 0.92, then the following formula applies to the calculation of the target factor:

[0123]

[0124] Therefore, the fifth formula is derived from the above target factor calculation formula. If the active power obtained from the power grid at 10 o'clock is 1000kW, the reactive power sent is 150kW, and the reactive power absorbed is 50kW, the target reactive power calculated according to the fifth formula is 225kW.

[0125] Step S408: Obtain the sum Q of compensated reactive power for multiple time units prior to the current moment in the current statistical period. t .

[0126] For example, by monitoring the power meter at the gateway in real time, the compensated reactive power of multiple time units before the current time can be obtained (for example, the compensated reactive power of 3 hours from 7:00 to 10:00 is 20KW, 30KW, and 40KW). The sum of the compensated reactive power of 3 hours is 90KW.

[0127] Step S409, if the sum of reactive power Q has been compensated t If the reactive power is less than the target reactive power Q, and the current time is within the equipment's operating time range, then continue to control multiple photovoltaic inverters to send reactive power to the grid according to the next preset operating time based on the reactive power to be adjusted.

[0128] For example, the compensated reactive power is 90kW, the target reactive power is 225kW, and the current time is 10:00. Based on the reactive power to be adjusted, multiple photovoltaic inverters will continue to send reactive power to the grid according to the next preset working time (e.g., 11:00). If the compensated reactive power Q... t If the reactive power is greater than or equal to the target reactive power Q, then multiple photovoltaic inverters will be controlled to stop sending reactive power to the grid at the current moment to avoid overcompensation. If the current moment (e.g., 8 PM) is not within the equipment's operating time, then the reactive power sent by the photovoltaic inverters will be controlled again during the equipment's operating time on the next day.

[0129] This invention determines whether the target power is exceeded by acquiring the compensated reactive power and restricting the reactive power adjustment process within the equipment's operating time range. This minimizes the impact of the external environment on the power grid operation. During this time period, the output power of the photovoltaic power generation system is relatively stable, and the photovoltaic inverter is adjusted uniformly and stably to send reactive power to the power grid according to the preset operating time. This efficiently compensates for the reactive power of the power grid and ensures the stable operation of the power grid, thereby effectively improving the power factor.

[0130] This embodiment also provides a device for adjusting the power factor of a microgrid based on reactive power. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0131] This embodiment provides a device for adjusting the power factor of a microgrid based on reactive power, such as... Figure 4 As shown, it includes:

[0132] Data acquisition module 401 is used to acquire the active power, reactive power transmitted, reactive power absorbed and real-time reactive power of the power grid in the previous statistical period.

[0133] The power factor calculation module 402 is used to calculate the first real-time power factor based on the active power taken from the power grid, the reactive power sent up, and the reactive power absorbed in the previous statistical period, according to the first formula.

[0134] The power acquisition module 403 is used to calculate the reactive power to be adjusted for all photovoltaic inverters based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, according to the second formula if the first real-time power factor is less than the first preset standard power factor.

[0135] The control module 404 is used to control multiple photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period based on the reactive power to be adjusted.

[0136] In one alternative implementation, the first formula in the power factor calculation module 402 is:

[0137]

[0138] Where γ is the real-time power factor, Δep grid For active power, ΔeReactive grid To transmit reactive power, ΔepReactive grid To absorb reactive power.

[0139] In one optional implementation, the second formula in the power acquisition module 403 is:

[0140]

[0141] Where, q instruction For the reactive power to be adjusted, q grid η is the real-time reactive power, η is the preset safety factor, and q is the reactive power.rate,i Let be the rated power of the i-th photovoltaic inverter, and n be the number of photovoltaic inverters.

[0142] In some alternative implementations, the control module 504 includes:

[0143] The first power ratio calculation subunit is used to calculate the reactive power q to be adjusted. instruction The first output power ratio pmt1 is calculated based on the preset damping coefficient c and the rated power of n photovoltaic inverters according to the following third formula;

[0144]

[0145] The first control subunit is used to generate a control command by taking the first power ratio as the target power ratio if the first power ratio is greater than or equal to a preset ratio, and control n photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period based on the control command.

[0146] The second power ratio calculation subunit is used to remove at least j photovoltaic inverters from the n photovoltaic inverters if the first power ratio is less than a preset ratio, based on the reactive power q to be adjusted. instruction The second power output ratio pmt2 is calculated based on the preset damping coefficient c and the rated power of nj photovoltaic inverters according to the following fourth formula.

[0147]

[0148] The value of j ensures that the second power ratio is greater than or equal to the preset ratio.

[0149] The second control subunit is used to generate control commands by taking the second power ratio as the target power ratio, and control nj photovoltaic inverters to send reactive power to the grid according to the preset working time of the current statistical period based on the control commands.

[0150] In an optional embodiment, the above-mentioned device further includes: a second power factor calculation module, used to obtain the active power, reactive power transmitted, and reactive power absorbed by the power grid at the current moment of the current statistical period; based on the active power, reactive power transmitted, and reactive power absorbed by the power grid at the current moment of the current statistical period, calculate a second real-time power factor according to a first formula; if the second real-time power factor is greater than a second preset standard power factor, then control at least one photovoltaic inverter to stop transmitting reactive power to the power grid at the current moment.

[0151] In an optional implementation, the above-described apparatus further includes: a time setting module, used to take the time interval from the first hour after sunrise to the last hour before sunset as the device working time interval; to divide the device working time interval into multiple time units, and to set the start time corresponding to each time unit as a preset working time.

[0152] In an optional embodiment, the above-mentioned device further includes: a power direction monitoring module, used to monitor the reactive power direction at the current moment of the current statistical period in real time; if the reactive power direction changes, then at the current moment, control all photovoltaic inverters to stop sending reactive power to the grid, and at the next preset working moment of the current moment, continue to control multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted.

[0153] In an optional embodiment, the above-described apparatus further includes: a compensation power monitoring module, used to obtain the active power Δep at the current moment of the current statistical period. grid ΔeReactive power is sent up. grid ΔepReactive power absorption grid And combined with the preset target power factor pf target The target reactive power Q is calculated according to the fifth formula below;

[0154]

[0155] Get the sum of compensated reactive power Q from multiple time units prior to the current moment in the current statistical period. t If the sum of reactive power Q has been compensated t If the reactive power is less than the target reactive power Q, and the current time is within the equipment's operating time range, then continue to control multiple photovoltaic inverters to send reactive power to the grid according to the next preset operating time based on the reactive power to be adjusted.

[0156] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0157] This invention, through obtaining the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in a statistical period at the power gateway location, effectively reduces costs by eliminating the need for equipment such as SVG (Static Var Generator) and capacitor compensation cabinets. A first real-time power factor is calculated. If the first real-time power factor does not reach the preset standard power factor (State Grid standard), the reactive power to be adjusted for all photovoltaic inverters is calculated according to a second formula based on the real-time reactive power, a preset safety factor, and the rated power of all photovoltaic inverters. The preset safety factor in the data calculation prevents the transmitted power from exceeding the rated power of the photovoltaic inverters, ensuring normal equipment operation and avoiding a reduction in photovoltaic power generation efficiency due to power factor adjustment. By controlling the reactive power output of the photovoltaic inverters according to the preset working time of the current statistical period using the reactive power to be adjusted, the power factor is effectively improved at a lower cost, ensuring that the power factor meets the standard requirements.

[0158] In this embodiment, the microgrid power factor adjustment device based on reactive power is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0159] This invention also provides a computer device having the above-described features. Figure 4 The device shown is a microgrid power factor adjustment device based on reactive power.

[0160] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0161] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0162] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0163] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0164] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0165] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0166] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0167] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined herein.

Claims

1. A method for adjusting the power factor of a microgrid based on reactive power, characterized in that, The method includes: Get the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in the previous statistical period; Based on the active power drawn from the power grid, the reactive power transmitted to the grid, and the reactive power absorbed in the previous statistical period, the first real-time power factor is calculated according to the first formula; the first formula is: ； in, For real-time power factor, Active power To transmit reactive power, To absorb reactive power; If the first real-time power factor is less than the first preset standard power factor, then based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, the reactive power to be adjusted for all photovoltaic inverters is calculated according to the second formula; the second formula is: ； in, For the reactive power to be adjusted, For real-time reactive power, To preset a safety factor, Let n be the rated power of the i-th photovoltaic inverter, and n be the number of photovoltaic inverters. Based on the reactive power to be adjusted, multiple photovoltaic inverters are controlled to send reactive power to the power grid according to the preset working time of the current statistical period.

2. The method according to claim 1, characterized in that, The step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to a preset working time of the current statistical period includes: Based on the reactive power to be adjusted The first power output ratio is calculated based on the preset damping coefficient c and the rated power of n photovoltaic inverters according to the following third formula. ; ； If the first power distribution ratio is greater than or equal to the preset ratio, then the first power distribution ratio is used as the target power ratio to generate a control command. Based on the control command, the n photovoltaic inverters are controlled to distribute reactive power to the grid according to the preset working time of the current statistical period. If the first power distribution ratio is less than a preset ratio, then remove at least j photovoltaic inverters from the n photovoltaic inverters, based on the reactive power to be adjusted. The second power output ratio is calculated using the preset damping coefficient c and the rated power of nj photovoltaic inverters according to the following fourth formula. ; ； The value of j ensures that the second power ratio is greater than or equal to the preset ratio. The second power ratio is used as the target power ratio to generate control commands. Based on the control commands, the nj photovoltaic inverters are controlled to send reactive power to the grid according to the preset working time of the current statistical period.

3. The method according to claim 1, characterized in that, After the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: Obtain the active power, reactive power transmitted, and reactive power absorbed by the power grid at the current moment of the current statistical period; Based on the active power, reactive power transmitted, and reactive power absorbed by the power grid at the current moment of the current statistical period, the second real-time power factor is calculated according to the first formula. If the second real-time power factor is greater than the second preset standard power factor, then at least one photovoltaic inverter is controlled to stop sending reactive power to the grid at the current moment.

4. The method according to any one of claims 1 to 3, characterized in that, Before the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: The time interval from the first hour after sunrise to the last hour before sunset is defined as the equipment's working time interval. The working time interval of the device is divided into multiple time units, and the start time of each time unit is set as a preset working time.

5. The method according to claim 4, characterized in that, After the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: Real-time monitoring of the direction of reactive power at the current moment of the current statistical period; If the direction of the reactive power changes, all photovoltaic inverters will be controlled to stop sending reactive power to the grid at the current moment, and at the next preset working moment, the multiple photovoltaic inverters will continue to send reactive power to the grid based on the reactive power to be adjusted.

6. The method according to claim 4, characterized in that, After the step of controlling multiple photovoltaic inverters to send reactive power to the grid based on the reactive power to be adjusted according to the preset working time of the current statistical period, the method further includes: Get the active power at the current moment of the current statistical period. Upload reactive power Absorbing reactive power And combined with the preset target power factor The target reactive power is calculated according to the fifth formula below. ; ； Get the sum of compensated reactive power for multiple time units prior to the current moment in the current statistical period. ; If the sum of the compensated reactive power is... Less than the target reactive power If the current time is within the equipment's operating time interval, then the multiple photovoltaic inverters will continue to send reactive power to the grid according to the next preset operating time based on the reactive power to be adjusted.

7. A device for adjusting the power factor of a microgrid based on reactive power, characterized in that, The device includes: The data acquisition module is used to obtain the active power, reactive power transmitted, reactive power absorbed, and real-time reactive power of the power grid in the previous statistical period. The power factor calculation module is used to calculate the first real-time power factor based on the active power drawn from the power grid, the reactive power transmitted, and the reactive power absorbed in the previous statistical period, according to a first formula; the first formula is: ； in, For real-time power factor, Active power To transmit reactive power, To absorb reactive power; The power acquisition module is configured to, if the first real-time power factor is less than the first preset standard power factor, calculate the reactive power to be adjusted for all photovoltaic inverters based on the real-time reactive power, the preset safety factor, and the rated power of all photovoltaic inverters, according to a second formula; the second formula is: ； in, For the reactive power to be adjusted, For real-time reactive power, To preset a safety factor, Let n be the rated power of the i-th photovoltaic inverter, and n be the number of photovoltaic inverters. The control module is used to control multiple photovoltaic inverters to send reactive power to the power grid based on the reactive power to be adjusted and according to the preset working time of the current statistical period.

8. A computer device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the method for adjusting the power factor of a microgrid based on reactive power as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method of adjusting the power factor of a microgrid based on reactive power as described in any one of claims 1 to 6.

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