Active flexible control method and device for pure off-grid new energy power system, and medium

Abstract

The invention discloses an active power flexible control method and device for a pure off-grid new energy power system and a medium, and belongs to the technical field of power system control protection. Calculating active adjustment increments of all the new energy stations based on the active power according to the charging power, the discharging power and the charging and discharging coefficient, and controlling the stored energy to discharge or charge to control the SOC value within a reasonable interval; calculating the sum of the active adjustable quantity and the sum of the active adjustable quantity of the new energy stations under each priority, and sorting the new energy stations from high to low according to the priority sequence of the new energy stations; and distributing active power to the sorted new energy stations according to the active power adjustment increments of all the new energy stations, calculating the active power target value of each new energy station, and adjusting the active power output of each new energy station based on the active power target value of each new energy station. The problem that an existing pure off-grid power system lacks an active flexible control function is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pure off-grid new energy power system active flexible control method, equipment and medium, belong to power system control protection technical field. BACKGROUND

[0002] With the acceleration of new power system construction, high energy-consuming enterprises in remote areas consider economic factors, such as mining, hydrogen production, electrolytic aluminum and other enterprises by investment construction network type energy storage and wind power, photovoltaic and other new energy power generation equipment, to build a pure off-grid new energy power system, to stabilize power supply for load.

[0003] Although network type energy storage can replace the voltage support of generator in the power grid as a voltage source, the capacity required for network type energy storage is large enough, and the degree of electric cost is high when traditional diesel or gas turbine is used for power supply, and there are environmental problems, which further increases the overall investment cost. A more economical and environmentally friendly solution is to use new energy power supply, and the existing control method still relies on manual operation, which is low in operation efficiency and depends on the experience of operating personnel, and frequent manual operation is prone to misjudgment caused by misadjustment, missed adjustment and other problems, which increases the control risk and significantly affects the system stability, making it difficult to ensure economic operation. It is urgent to upgrade by installing pure off-grid new energy power system active flexible control function to solve the current problem of pure off-grid new energy power system active flexible control, realize efficient use and cooperation of active resources, and support safe and stable operation of high-proportion new energy power grid under new power system. However, there is little research on pure off-grid new energy power system active flexible control method. SUMMARY

[0004] The purpose of the present application is to provide a kind of pure off-grid new energy power system active flexible control method, equipment and medium, by adjusting the active output of each new energy station, to solve the problem of lack of active flexible control function in existing pure off-grid power system, to ensure the safety of enterprise production and operation and the economy of electricity.

[0005] To solve the above technical problems, the present application is realized by using the following technical scheme.

[0006] In the first aspect, the present application provides a kind of pure off-grid new energy power system active flexible control method, comprising:

[0007] Real-time monitoring and collecting SOC value, active power, charging power, discharging power and charge-discharge coefficient of energy storage;

[0008] Compare the SOC value with the preset reasonable interval threshold value, calculate the active adjustment increment of all new energy stations based on the active power according to the charging power, discharging power and charge-discharge coefficient, control the energy storage to discharge or charge to control the SOC value in the reasonable interval;

[0009] obtain the active up-regulation amount and the active down-regulation amount of each new energy station, calculate the total active up-regulation amount and the total active down-regulation amount of the new energy stations under each priority according to a preset priority order of the new energy stations;

[0010] sort the new energy stations according to the priority order from high to low based on the total active up-regulation amount and the total active down-regulation amount;

[0011] distribute the active power to the sorted new energy stations according to the active adjustment increment of all the new energy stations, and calculate the active output adjustment increment value of each new energy station;

[0012] calculate the active target value of each new energy station according to the active output adjustment increment of each new energy station, and adjust the active output of each new energy station based on the active target value of each new energy station.

[0013] Further, compare the SOC value with a preset reasonable interval threshold, calculate the active output adjustment instruction of each new energy station based on the active power according to the charging power, the discharging power and the charging and discharging coefficient, and control the energy storage to discharge or charge to control the SOC value within the reasonable interval, including:

[0014] When the SOC value is greater than the upper critical point of the reasonable interval, calculate the active adjustment increment of all the new energy stations based on the active power according to the maximum discharging power, and control the energy storage to discharge to reduce the SOC value to within the reasonable interval;

[0015] When the SOC value is less than the lower critical point of the reasonable interval, calculate the active adjustment increment of all the new energy stations based on the active power according to the maximum charging power, and control the energy storage to charge to increase the SOC value to within the reasonable interval;

[0016] When the SOC value is within the reasonable interval, calculate the output instruction of each new energy station based on the active power according to the charging power and the discharging power and the deviation of the SOC value from a preset SOC standard value, and control the energy storage unit to slow charge and discharge to keep the SOC within the reasonable interval; the upper critical point of the reasonable interval is a preset SOC high fixed value; the lower critical point of the reasonable interval is a preset SOC low fixed value; the charging and discharging coefficient includes a fast charging and discharging coefficient, a slow charging and discharging coefficient and a limited charging and discharging coefficient.

[0017] Further, when the SOC value is greater than the upper critical point of the reasonable interval, calculate the active adjustment increment of all the new energy stations based on the active power according to the maximum discharging power and the fast charging and discharging coefficient / slow charging and discharging coefficient, and control the energy storage to discharge to reduce the SOC value to within the reasonable interval, including:

[0018] When the SOC value is greater than a preset SOC over-high fixed value:

[0019] If the active power is greater than the product of the maximum discharging power and the fast-charging discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0020] If the active power is less than or equal to the product of the maximum discharging power and the fast-charging discharging coefficient, the active power adjustment increment of all new energy stations is the product of the maximum discharging power and the fast-charging discharging coefficient;

[0021] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to perform fast discharging to reduce the SOC value to a reasonable interval;

[0022] When the SOC value is greater than the preset SOC high set value and less than or equal to the preset SOC excessively high set value:

[0023] If the active power is greater than the product of the discharging power and the slow-charging discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0024] If the active power is less than or equal to the product of the discharging power and the slow-charging discharging coefficient, the active power adjustment increment of all new energy stations is the product of the discharging power and the slow-charging discharging coefficient;

[0025] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to perform slow discharging to reduce the SOC value to a reasonable interval.

[0026] Further, when the SOC value is less than the lower critical point of the reasonable interval, the active power adjustment increment of all new energy stations is calculated based on the maximum charging power, and the energy storage is controlled to perform charging to raise the SOC value to the reasonable interval, including:

[0027] When the SOC value is greater than the preset SOC excessively low set value and less than or equal to the preset SOC excessively low set value:

[0028] If the active power is less than the negative of the product of the charging power and the slow-charging discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0029] If the active power is greater than or equal to the negative of the product of the charging power and the slow-charging discharging coefficient, the active power adjustment increment of all new energy stations is the negative of the product of the charging power and the slow-charging discharging coefficient;

[0030] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to perform slow charging to raise the SOC value to a reasonable interval;

[0031] When the SOC value is greater than the preset SOC low set value:

[0032] If the active power is less than the negative of the product of the charging power and the fast-charging discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0033] If the active power is greater than or equal to the product of the charging power and the fast charging and discharging coefficient, the active power adjustment increment of all new energy stations is the negative of the product of the charging power and the fast charging and discharging coefficient;

[0034] The SOC value is raised to a reasonable interval by controlling the energy storage to fast charge according to the active power adjustment increment of all new energy stations.

[0035] Further, when the SOC value is in the reasonable interval, the output instruction of each new energy station is calculated based on the active power according to the charging power and the discharging power and the deviation of the SOC value from the preset SOC standard value, and the energy storage unit is controlled to slow charge and discharge to keep the SOC in the reasonable interval, including:

[0036] When the SOC value is greater than the SOC set value and the SOC is less than or equal to the SOC high set value:

[0037] If the active power is greater than the product of the discharging power and the limit charging and discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0038] If the active power is less than or equal to the product of the discharging power and the limit charging and discharging coefficient, the active power adjustment increment of all new energy stations is the product of the discharging power and the limit charging and discharging coefficient;

[0039] The SOC value is kept in the reasonable interval by controlling the energy storage to slow discharge according to the active power adjustment increment of all new energy stations;

[0040] When the SOC value is greater than the SOC low set value and the SOC is less than or equal to the SOC set value:

[0041] If the active power is less than the negative of the product of the charging power and the limit charging and discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0042] If the active power is less than the negative of the product of the charging power and the limit charging and discharging coefficient, the active power adjustment increment of all new energy stations is the negative of the product of the charging power and the limit charging and discharging coefficient;

[0043] The SOC value is kept in the reasonable interval by controlling the energy storage to slow charge according to the active power adjustment increment of all new energy stations.

[0044] Further, the active power upgradable amount sum and the active power downgradable amount sum are respectively represented as:

[0045] ;

[0046] ;

[0047] In the formula, represents the first The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The active power up-regulation amount of the new energy station, The total number of new energy stations.

[0048] Further, if the active power adjustment increment of all new energy stations is greater than 0, when the new energy station with the priority of can meet the active power output increment requirement:

[0049] The active power output regulation increment value of the new energy station with the priority higher than is represented as:

[0050] ;

[0051] The active power output regulation increment value of the new energy station with the priority equal to is,

[0052] ;

[0053] The active power output regulation increment value of the new energy station with the priority lower than is,

[0054] ;

[0055] If the active power adjustment increment of all new energy stations is equal to 0, the active power output regulation increment value of the new energy station with the priority of is represented as:

[0056] ;

[0057] If the active power adjustment increment of all new energy stations is less than 0, when the new energy station with the priority of can meet the active power output increment requirement:

[0058] The active power output regulation increment value of the new energy station with the priority higher than is represented as:

[0059] ;

[0060] The active power output regulation increment value of the new energy station with the priority equal to is,

[0061] ;

[0062] Priority is lower than The active power output adjustment increment value of the new energy station is,

[0063] ;

[0064] In the formula, The active power output adjustment increment value of the first new energy station is, The active power adjustment increment of all new energy stations is.

[0065] Further, the active target value of each new energy station is calculated according to the active power output adjustment increment of each new energy station, wherein the active target value of the first new energy station is expressed as:

[0066] ;

[0067] In the formula, The active target value of the first new energy station is, The active power of the first new energy station is, wherein if the active target value of the first new energy station is greater than the maximum active power of the first new energy station , = , if the active target value of the first new energy station is less than the minimum active power of the first new energy station , = .

[0068] In the second aspect, the present application provides a computer device, comprising 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 realize the steps of the active flexible control method of the pure off-grid new energy power system according to the first aspect.

[0069] In the third aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the steps of the active flexible control method of the pure off-grid new energy power system according to the first aspect.

[0070] Compared with the prior art, the present application has the following beneficial effects:

[0071] The SOC value, active power, charging power, discharging power and charging / discharging coefficient of the energy storage are monitored and collected in real time, the active adjustment increment is dynamically calculated, the precise control of the energy storage charging and discharging is realized to maintain the SOC in a reasonable range; meanwhile, based on the preset new energy station priority order and the sorting and distribution mechanism of the active upward adjustment amount sum and the active downward adjustment amount sum, the distribution of the active output adjustment increment value of each station is effectively optimized, the flexible control ability of the active power in the pure off-grid new energy power system is significantly improved through the accurate calculation and adjustment of the active target value, the system operation stability is ensured and the new energy consumption efficiency is improved, and the problem that the existing pure off-grid power system lacks active flexible control function is solved. BRIEF DESCRIPTION OF DRAWINGS

[0072] Figure 1 is a flowchart of a pure off-grid new energy power system active flexible control method provided by an embodiment of the present application;

[0073] Figure 2 is a schematic diagram of a pure off-grid new energy power system topology structure to which an embodiment of the present application is applied. DETAILED DESCRIPTION

[0074] The technical scheme of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical scheme of the present application, and are not limitations of the technical scheme of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0075] The term "and / or", only describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0076] Embodiment 1

[0077] As shown in Figure 1 , the present embodiment introduces a pure off-grid new energy power system active flexible control method, which comprises:

[0078] Step one: real-time monitoring and collecting the SOC value, active power, charging power, discharging power and charging / discharging coefficient of the energy storage.

[0079] The SOC value, active power, charging power, discharging power, and charging and discharging coefficient of the energy storage are monitored and collected in real time, accurate real-time data support is provided for subsequent active flexible control, the control strategy can be dynamically adjusted based on the latest system state, control deviation caused by data lag is avoided, and the timeliness and accuracy of system response are improved.

[0080] In step two, the SOC value is compared with the preset reasonable interval threshold, the active adjustment increment of all new energy stations is calculated based on the charging power, discharging power, and charging and discharging coefficient according to the active power, and the energy storage is controlled to discharge or charge to control the SOC value in the reasonable interval.

[0081] In this embodiment, the SOC value of the energy storage is dynamically compared with the preset reasonable interval threshold, the active adjustment increment is calculated in combination with the active power, charging power, discharging power, and charging and discharging coefficient, the charging and discharging process of the energy storage is accurately controlled, the SOC value is effectively stabilized in the reasonable interval, the influence of overcharging or overdischarging on the service life of the energy storage equipment is avoided, the reliability of active power regulation of the system is ensured, and stable energy storage support is provided for active distribution of the new energy station.

[0082] In step three, the active up-regulation amount and the active down-regulation amount of each new energy station are obtained, and the active up-regulation amount sum and the active down-regulation amount sum of the new energy stations under each priority level are calculated according to the preset priority order of the new energy stations.

[0083] In this embodiment, the active up-regulation amount and the active down-regulation amount of each new energy station are obtained, and the total amount of the up-regulation amount and the down-regulation amount under each priority level is calculated in combination with the preset priority order, a quantitative basis is provided for subsequent active distribution, the adjustment capacity boundary of the stations under different priority levels is clear, the control strategy can meet the adjustment demand of the stations under high priority level preferentially, and the rationality and pertinence of active resource distribution are improved.

[0084] In step four, the new energy stations are sorted according to the priority order from high to low based on the active up-regulation amount sum and the active down-regulation amount sum.

[0085] In this embodiment, the new energy stations are sorted according to the priority order from high to low based on the active up-regulation amount sum and the active down-regulation amount sum, the priority order of active distribution is clear, the problems of low adjustment efficiency or neglect of key station demand caused by disordered distribution are avoided, an orderly execution foundation is laid for accurate distribution of the active adjustment increment, and the operability of the control strategy is improved.

[0086] In step five, the active power is distributed to the sorted new energy stations according to the active adjustment increment of all new energy stations, and the active output adjustment increment value of each new energy station is calculated.

[0087] This embodiment allocates active power based on the active power adjustment increments of all new energy power plants and the sorted priority order, and calculates the active power output adjustment increment value of each power plant. This achieves efficient allocation of active power resources, ensures the orderliness and controllability of the adjustment process, avoids system power imbalance caused by uneven allocation, and improves the flexibility and adaptability of system active power control.

[0088] Step Six: Calculate the active power target value of each new energy power station based on the active power output adjustment increment of each new energy power station, and adjust the active power output of each new energy power station based on the active power target value of each new energy power station.

[0089] This embodiment calculates the active power target value based on the active power output adjustment increment value of each new energy power station, and adjusts the active power output of each power station accordingly. This achieves precise closed-loop control of active power in a pure off-grid new energy power system, ensures system power balance, avoids operational stability problems caused by active power deviation, and improves the new energy absorption capacity and overall system operating efficiency.

[0090] Example 2

[0091] Based on the same inventive concept as Embodiment 1, this embodiment introduces a flexible active power control method for a pure off-grid renewable energy power system, applicable to... Figure 2 The pure off-grid renewable energy power system shown is as follows: Figure 2 As shown, wind farms and photovoltaic power stations are connected to step-up substations to transmit active power, while electrical loads absorb active power through step-down substations. Energy storage connected to the grid is responsible for providing a stable voltage source, supporting the stable and reliable operation of the entire system in a purely off-grid mode. The method described is used to achieve flexible active power control of a purely off-grid renewable energy power system, and includes the following steps:

[0092] Step 1: Monitor and collect the SOC value, active power, charging power, discharging power and charge / discharge coefficient of the energy storage in real time.

[0093] Step 2: Compare the SOC value with the preset reasonable range threshold. Based on the active power, calculate the active power adjustment increment of all new energy power stations according to the charging power, discharging power and charge / discharge coefficient, and control the energy storage to discharge or charge to keep the SOC value within the reasonable range.

[0094] In this embodiment, the upper critical point of the reasonable range is a preset high SOC value; the lower critical point of the reasonable range is a preset low SOC value; and the charge / discharge coefficient includes a fast charge / discharge coefficient, a slow charge / discharge coefficient, and a limited charge / discharge coefficient.

[0095] In this embodiment, when the SOC value is greater than the upper threshold of the reasonable range, the active power adjustment increment of all new energy power plants is calculated based on the maximum discharge power, and the energy storage is controlled to discharge to reduce the SOC value to within the reasonable range.

[0096] When the SOC value is greater than the preset SOC overhigh set value:

[0097] If the active power is greater than the product of the maximum discharge power and the fast-charging discharge coefficient, the active power adjustment increment of all new energy stations is 0;

[0098] If the active power is less than or equal to the product of the maximum discharge power and the fast-charging discharge coefficient, the active power adjustment increment of all new energy stations is the product of the maximum discharge power and the fast-charging discharge coefficient;

[0099] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to be discharged quickly to reduce the SOC value to the reasonable interval;

[0100] When the SOC value is greater than the preset SOC high set value and less than or equal to the preset SOC overhigh set value:

[0101] If the active power is greater than the product of the discharge power and the slow-charging discharge coefficient, the active power adjustment increment of all new energy stations is 0;

[0102] If the active power is less than or equal to the product of the discharge power and the slow-charging discharge coefficient, the active power adjustment increment of all new energy stations is the product of the discharge power and the slow-charging discharge coefficient;

[0103] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to be discharged slowly to reduce the SOC value to the reasonable interval.

[0104] In the present embodiment, when the SOC value is less than the lower critical point of the reasonable interval, the active power adjustment increment of all new energy stations is calculated based on the active power according to the maximum charging power, and the energy storage is controlled to be charged to raise the SOC value to the reasonable interval:

[0105] When the SOC value is greater than the preset SOC overlow set value and less than or equal to the preset SOC overlow set value:

[0106] If the active power is less than the opposite number of the product of the charging power and the slow-charging discharge coefficient, the active power adjustment increment of all new energy stations is 0;

[0107] If the active power is greater than or equal to the opposite number of the product of the charging power and the slow-charging discharge coefficient, the active power adjustment increment of all new energy stations is the opposite number of the product of the charging power and the slow-charging discharge coefficient;

[0108] According to the active power adjustment increment of all new energy stations, the energy storage is controlled to be charged slowly to raise the SOC value to the reasonable interval;

[0109] When the SOC value is greater than the preset SOC low set value:

[0110] If the active power is less than the opposite of the product of the charging power and the fast charging and discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0111] If the active power is greater than or equal to the opposite of the product of the charging power and the fast charging and discharging coefficient, the active power adjustment increment of all new energy stations is the opposite of the product of the charging power and the fast charging and discharging coefficient;

[0112] The energy storage is controlled to perform fast charging according to the active power adjustment increment of all new energy stations to raise the SOC value to the reasonable interval.

[0113] In the embodiment, when the SOC value is in the reasonable interval, the output instruction of each new energy station is calculated according to the charging power and the discharging power and the deviation of the SOC value from the preset SOC standard value based on the active power, and the energy storage unit is controlled to perform slow charging and discharging to keep the SOC in the reasonable interval:

[0114] When the SOC value is greater than the SOC set value and the SOC is less than or equal to the SOC high set value:

[0115] If the active power is greater than the product of the discharging power and the limited charging and discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0116] If the active power is less than or equal to the product of the discharging power and the limited charging and discharging coefficient, the active power adjustment increment of all new energy stations is the product of the discharging power and the limited charging and discharging coefficient;

[0117] The energy storage is controlled to perform slow discharging according to the active power adjustment increment of all new energy stations to keep the SOC value in the reasonable interval;

[0118] When the SOC value is greater than the SOC low set value and the SOC is less than or equal to the SOC set value:

[0119] If the active power is less than the opposite of the product of the charging power and the limited charging and discharging coefficient, the active power adjustment increment of all new energy stations is 0;

[0120] If the active power is less than the opposite of the product of the charging power and the limited charging and discharging coefficient, the active power adjustment increment of all new energy stations is the opposite of the product of the charging power and the limited charging and discharging coefficient;

[0121] The energy storage is controlled to perform slow charging according to the active power adjustment increment of all new energy stations to keep the SOC value in the reasonable interval.

[0122] In some embodiments, the SOC over-high setting value and SOC high setting value are preset to 60% and 90% respectively, the SOC over-low setting value and SOC low setting value are preset to 10% and 40% respectively, the SOC setting value is preset to 50%, and the SOC over-high setting value ≥ SOC high setting value ≥ SOC setting value ≥ SOC low setting value ≥ SOC over-low setting value.

[0123] In some embodiments, the fast charge / discharge coefficient of energy storage is set to [0.5, 0.95], the slow charge / discharge coefficient is set to [0.25, 0.75], and the limited charge / discharge coefficient is set to [0.05, 0.5].

[0124] Step 3: Obtain the active power up-adjustment and active power down-adjustment of each renewable energy power station. Based on the preset priority order of each renewable energy power station, calculate the sum of the active power up-adjustment and active power down-adjustment of each priority level.

[0125] In this embodiment, the total amount of active power that can be adjusted upwards and the total amount of active power that can be adjusted downwards are respectively expressed as follows:

[0126] ;

[0127] ;

[0128] In the formula, Indicates the first The active power capacity of each new energy power station can be increased. Indicates the first The priority of adjustable active power capacity for each new energy power station. Indicates the first The active power of each new energy power station can be reduced. Indicates the first The active power of each new energy power station can be reduced in priority. Indicates the preset first Priority of each new energy power station This indicates the total number of new energy power stations.

[0129] Step 4: Based on the total active power that can be adjusted upwards and the total active power that can be adjusted downwards, sort the new energy power stations in descending order of priority.

[0130] Step 5: Allocate active power to the sorted new energy power stations based on the active power adjustment increment of all new energy power stations, and calculate the active power output adjustment increment value of each new energy power station.

[0131] In this embodiment, if the active power adjustment increment of all new energy power stations is greater than 0, then when the priority is... When the new energy power stations can meet the incremental requirements of active power output:

[0132] Higher priority The incremental value of the active power output regulation of the new energy power station is expressed as:

[0133] ;

[0134] Priority equals The incremental value of the active power output adjustment of the new energy power station is,

[0135] ;

[0136] Priority lower than The incremental value of the active power output adjustment of the new energy power station is,

[0137] ;

[0138] If the active power adjustment increment of all new energy power stations is equal to 0, then the first The incremental value of active power output regulation for each new energy power station is expressed as follows:

[0139] ;

[0140] In this embodiment, if the active power adjustment increment of all new energy power stations is less than 0, then when the priority is... When the new energy power stations can meet the incremental requirements of active power output:

[0141] Higher priority The incremental value of the active power output regulation of the new energy power station is expressed as:

[0142] ;

[0143] Priority equals The incremental value of the active power output adjustment of the new energy power station is,

[0144] ;

[0145] Priority lower than The incremental value of the active power output adjustment of the new energy power station is,

[0146] ;

[0147] In the formula, Indicates the first The incremental value of active power output adjustment for each new energy power station. This represents the active power adjustment increment for all new energy power plants.

[0148] Step 6: Calculate the active power target value of each new energy power station based on the active power output adjustment increment of each new energy power station, and adjust the active power output of each new energy power station based on the active power target value of each new energy power station.

[0149] In the embodiment, the active target value of each new energy station is calculated according to the active output adjustment increment of each new energy station, wherein the active target value of the first new energy station is expressed as:

[0150]

[0151] In the formula, Ptarget,i represents the active target value of the i th new energy station, Pmax,i represents the maximum active power of the i th new energy station, and Pmin,i represents the minimum active power of the i th new energy station.

[0152] Embodiment 3

[0153] Based on the same inventive concept as other embodiments, the embodiment introduces a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the active flexible control method of the pure off-grid new energy power system according to Embodiment 1 or 2 when executing the computer program.

[0154] Embodiment 4

[0155] Based on the same inventive concept as other embodiments, the embodiment introduces a computer readable storage medium, which stores computer instructions, and the computer instructions are executed by a processor to implement the steps of the method of Embodiment 1 or 2.

[0156] ​​​​​​​​​​​​​​​​​​In summary of the above embodiments, the SOC value, active power, charging power, discharging power and charging / discharging coefficient of the energy storage are monitored and collected in real time, the active adjustment increment is dynamically calculated, the accurate control of the energy storage charging and discharging is realized to maintain the SOC in a reasonable interval; meanwhile, based on the preset new energy station priority order and the sorting and distribution mechanism of the active up-regulation amount sum and the active down-regulation amount sum, the distribution of the active output adjustment increment value of each station is effectively optimized, the flexible regulation and control capability of the active power under the pure off-grid new energy power system is significantly improved through the accurate calculation and adjustment of the active target value, the system operation stability is ensured and the new energy consumption efficiency is improved, and the problem that the existing pure off-grid power system lacks active flexible control function is solved.

[0157] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present 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, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0158] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the flow Figure 1 one or more flows and / or blocks Figure 1 means for performing the function specified by one or more blocks

[0159] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction means, which implements the flow Figure 1 one or more flows and / or blocks Figure 1 means for performing the function specified by one or more blocks

[0160] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are generated to realize the computer-implemented processes in the computer or other programmable devices, and the instructions executed in the computer or other programmable devices provide processes for implementing the functions specified in the flowchart Figure 1 one flow or multiple flows and / or the functions specified in the block Figure 1 one flow or multiple flows and / or the functions specified in the block

[0161] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which are all within the protection of the present application.

Claims

1. A flexible active power control method for a pure off-grid renewable energy power system, characterized in that, include: Real-time monitoring and acquisition of the SOC value, active power, charging power, discharging power and charge / discharge coefficient of energy storage; The SOC value is compared with the preset reasonable range threshold. Based on the active power, the active power adjustment increment of all new energy power stations is calculated according to the charging power, discharging power and charging and discharging coefficient. The energy storage is controlled to discharge or charge to keep the SOC value within the reasonable range. Obtain the active power up-adjustment and active power down-adjustment of each renewable energy power station. Based on the preset priority order of each renewable energy power station, calculate the sum of the active power up-adjustment and active power down-adjustment of each renewable energy power station under each priority. Based on the total active power that can be adjusted upwards and the total active power that can be adjusted downwards, the new energy power stations are ranked from high to low according to their priority. Based on the active power adjustment increment of all new energy power stations, active power is allocated to the sorted new energy power stations, and the active power output adjustment increment value of each new energy power station is calculated. The active power target value of each new energy power station is calculated based on the active power output adjustment increment of each new energy power station, and the active power output of each new energy power station is adjusted based on the active power target value of each new energy power station.

2. The active power flexible control method for a pure off-grid renewable energy power system according to claim 1, characterized in that, The SOC value is compared with a preset reasonable range threshold. Based on the active power, the active power output adjustment command of each new energy power station is calculated according to the charging power, discharging power, and charge / discharge coefficient. The energy storage is then controlled to discharge or charge to keep the SOC value within a reasonable range, including: When the SOC value is greater than the upper critical point of the reasonable range, the active power adjustment increment of all new energy power stations is calculated based on the maximum discharge power, and the energy storage is controlled to discharge to reduce the SOC value to the reasonable range. When the SOC value is less than the lower critical point of the reasonable range, the active power adjustment increment of all new energy power stations is calculated based on the maximum charging power, and the energy storage is controlled to charge to raise the SOC value to the reasonable range. When the SOC value is within a reasonable range, the output command of each new energy power station is calculated based on the active power, charging power, discharging power, and the deviation of the SOC value from the preset SOC standard value. The energy storage unit is then controlled to perform slow charging and discharging to keep the SOC within a reasonable range. The critical point on the upper limit of the reasonable range is a preset high SOC value; The lower critical point of the reasonable range is the preset low value of SOC; The charge / discharge coefficient includes the fast charge / discharge coefficient, the slow charge / discharge coefficient, and the limited charge / discharge coefficient.

3. The active power flexible control method for a pure off-grid renewable energy power system according to claim 2, characterized in that, When the SOC value exceeds the upper threshold of the reasonable range, the active power adjustment increment for all new energy power stations is calculated based on the maximum discharge power and the fast charge / discharge coefficient / slow charge / discharge coefficient, and the energy storage is controlled to discharge to reduce the SOC value to within the reasonable range, including: When the SOC value is greater than the preset SOC over-limit value: If the active power is greater than the product of the maximum discharge power and the fast charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is less than or equal to the product of the maximum discharge power and the fast charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is the product of the maximum discharge power and the fast charge / discharge coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is controlled to discharge rapidly and reduce the SOC value to a reasonable range; When the SOC value is greater than the preset SOC high value and less than or equal to the preset SOC excessively high value: If the active power is greater than the product of the discharge power and the slow charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is less than or equal to the product of the discharge power and the slow charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is the product of the discharge power and the slow charge / discharge coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is slowly discharged to reduce the SOC value to a reasonable range.

4. The active power flexible control method for a pure off-grid renewable energy power system according to claim 2, characterized in that, When the SOC value is less than the lower critical point of the reasonable range, the active power adjustment increment of all new energy power stations is calculated based on the maximum charging power, and the energy storage is controlled to charge and raise the SOC value to within the reasonable range, including: When the SOC value is greater than the preset SOC low setting value but less than or equal to the preset SOC low setting value: If the active power is less than the negative of the product of the charging power and the slow charging / discharging coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is greater than or equal to the negative of the product of the charging power and the slow charging / discharging coefficient, then the active power adjustment increment for all new energy power stations is the negative of the product of the charging power and the slow charging / discharging coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is used for slow charging to raise the SOC value to a reasonable range; When the SOC value is greater than the preset lower limit of SOC: If the active power is less than the negative of the product of the charging power and the fast charging / discharging coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is greater than or equal to the negative of the product of the charging power and the fast charging / discharging coefficient, then the active power adjustment increment for all new energy power stations is the negative of the product of the charging power and the fast charging / discharging coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is used for fast charging to raise the SOC value to a reasonable range.

5. The active power flexible control method for a pure off-grid renewable energy power system according to claim 2, characterized in that, When the SOC value is within a reasonable range, the output command of each new energy power station is calculated based on the active power, charging power, discharging power, and the deviation of the SOC value from the preset SOC standard value. This allows for slow charging and discharging of the energy storage units to maintain the SOC within a reasonable range, including: When the SOC value is greater than the SOC set value and the SOC is less than or equal to the SOC high set value: If the active power is greater than the product of the discharge power and the limited charge-discharge coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is less than or equal to the product of the discharge power and the limited charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is the product of the discharge power and the limited charge / discharge coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is controlled to operate in a slow discharge state to keep the SOC value within a reasonable range; When the SOC value is greater than the lower limit of SOC and the SOC is less than or equal to the set value of SOC: If the active power is less than the negative of the product of the charging power and the limited charge / discharge coefficient, then the active power adjustment increment for all new energy power stations is 0. If the active power is less than the negative of the product of the charging power and the limited charging / discharging coefficient, then the active power adjustment increment for all new energy power stations is the negative of the product of the charging power and the limited charging / discharging coefficient. Based on the active power adjustment increment of all new energy power stations, the energy storage is used for slow charging to keep the SOC value within a reasonable range.

6. The active power flexible control method for a pure off-grid renewable energy power system according to claim 1, characterized in that, The sum of the active power that can be adjusted upwards and the sum of the active power that can be adjusted downwards are respectively expressed as follows: ； ； In the formula, Indicates the first The active power capacity of each new energy power station can be increased. Indicates the first The priority of adjustable active power capacity for each new energy power station. Indicates the first The active power of each new energy power station can be reduced. Indicates the first The active power of each new energy power station can be reduced in priority. Indicates the preset first Priority of each new energy power station This indicates the total number of new energy power stations.

7. The active power flexible control method for a pure off-grid renewable energy power system according to claim 6, characterized in that, If the active power adjustment increment of all renewable energy power plants is greater than 0, then when the priority is... When the new energy power stations can meet the incremental requirements of active power output: Higher priority The incremental value of the active power output regulation of the new energy power station is expressed as: ； Priority equals The incremental value of the active power output adjustment of the new energy power station is, ； Priority lower than The incremental value of the active power output adjustment of the new energy power station is, ； If the active power adjustment increment of all new energy power plants is equal to 0, then the first The incremental value of active power output regulation for each new energy power station is expressed as follows: ； If the active power adjustment increment of all renewable energy power plants is less than 0, then when the priority is... When the new energy power stations can meet the incremental requirements of active power output: Higher priority The incremental value of the active power output regulation of the new energy power station is expressed as: ； Priority equals The incremental value of the active power output adjustment of the new energy power station is, ； Priority lower than The incremental value of the active power output adjustment of the new energy power station is, ； In the formula, Indicates the first The incremental value of active power output adjustment for each new energy power station. This represents the active power adjustment increment for all new energy power plants.

8. The active power flexible control method for a pure off-grid renewable energy power system according to claim 7, characterized in that, The active power target value of each new energy power station is calculated based on the active power output adjustment increment of each new energy power station, wherein the first... The active power target value for each new energy power station is expressed as follows: ； In the formula, Indicates the first The active power target value of each new energy power station. Indicates the first The active power of each new energy power station, where if the first... Active power target value of each new energy power station Greater than the The maximum active power of each new energy power station ,but = If the first Active power target value of each new energy power station Less than the Minimum active power of each new energy power station ,but = .

9. A computer 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 active power flexible control method for a pure off-grid renewable energy power system as described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the active power flexible control method for a pure off-grid renewable energy power system as described in any one of claims 1 to 8.

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