Renewable energy distribution network access optimization control method and system

Abstract

The application provides a renewable energy distribution network access optimization control method and system, and relates to the electrical technical field.The method comprises the following steps: obtaining power generation power and first phase information of a plurality of renewable energy power equipment at the i-th moment, and obtaining operating power, voltage and second phase information of power grid power; determining access phase information according to the second phase information and the first phase information; determining access voltage according to the access phase information, the first phase information, the power generation power and the voltage; determining access power according to the access voltage, the operating power and the power generation power; and controlling power access of the plurality of renewable energy power equipment to the power grid according to the access phase information, the access voltage and the access power.According to the application, appropriate access phase information can be determined, the probability of phase disorder can be reduced, the probability of three-phase imbalance can be reduced, renewable energy can be used as much as possible, thermal power pollution can be reduced, and energy utilization rate can be improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to a method and system for optimizing control of renewable energy distribution network access. Background Art

[0002] Renewable energy, including wind, solar, and tidal energy, can be used to build renewable energy power plants. This power can be supplied to the grid, reducing the pressure on thermal power plants and reducing pollution. However, the power generated by renewable energy plants can fluctuate and be unstable. When connected to the grid, these plants can cause phase distortion and three-phase imbalance.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0004] The present invention provides a method and system for optimizing the control of renewable energy distribution network access, which can solve the problems of phase confusion, three-phase imbalance, etc. caused by renewable energy power equipment being connected to the power grid.

[0005] According to a first aspect of the present invention, a method for optimizing and controlling access to a renewable energy distribution network is provided, comprising:

[0006] Obtaining the generated power and first phase information of multiple renewable energy power equipment at the i-th moment;

[0007] Obtaining the operating power, voltage and second phase information of the power grid at the i-th moment;

[0008] Determining access phase information of the plurality of renewable energy power devices according to the second phase information of the grid power and the first phase information of the plurality of renewable energy power devices;

[0009] determining access voltages of multiple renewable energy power devices according to the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power;

[0010] Determining access powers of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices;

[0011] According to the access phase information, the access voltage and the access power, the power access of multiple renewable energy power equipment to the power grid is controlled to provide power to the power grid in the time period between the i-th moment and the i+1-th moment.

[0012] According to a second aspect of the present invention, a renewable energy distribution network access optimization control system is provided, comprising:

[0013] A first acquisition module is used to obtain the generated power and first phase information of multiple renewable energy power equipment at the i-th moment;

[0014] A second acquisition module is used to obtain the operating power, voltage and second phase information of the power grid at the i-th moment;

[0015] an access phase information module, configured to determine access phase information of the plurality of renewable energy power devices based on the second phase information of the grid power and the first phase information of the plurality of renewable energy power devices;

[0016] an access voltage module, configured to determine access voltages of a plurality of renewable energy power devices according to the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power;

[0017] an access power module, configured to determine access powers of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices;

[0018] An access module is used to control the power access of multiple renewable energy power equipment to the power grid based on the access phase information, the access voltage and the access power, and to provide power to the power grid in the time period between the i-th moment and the i+1-th moment.

[0019] Technical Effect: According to the present invention, the first phase information can be calculated based on the second phase information of the power grid and the first phase information of multiple renewable energy power devices, thereby determining the appropriate access phase information and reducing the probability of phase confusion. Furthermore, the access voltage and access power can be further calculated based on the access phase information, reducing the probability of three-phase imbalance, maximizing the use of renewable energy, reducing thermal power pollution, and improving energy utilization. When determining the access voltage, voltage optimization constraints can be set to ensure that the access phase information of multiple renewable energy power devices always matches the phase of the power grid, and that the sum of the access voltages of multiple renewable energy power devices is close to the grid voltage, thereby reducing the probability of phase confusion, increasing the proportion of renewable energy in the power supply, reducing thermal power pollution, and improving energy utilization. Furthermore, an access voltage optimization function is set to ensure that the voltage provided by renewable energy power devices accounts for a higher proportion, reducing the proportion of voltage provided by thermal power, reducing thermal power pollution, and making the voltage of each phase of the three-phase voltage more balanced. When determining access power, access power optimization constraints can be used to constrain the relationship between access voltage and access power. Constraints on access current and access power can then be used to limit the range of access power and access current, ensuring that access power falls within a reasonable range. Furthermore, the access power optimization function can be used to optimize the power provided by renewable energy power equipment for each phase, thereby increasing the proportion of renewable energy power, reducing the proportion of thermal power power, and reducing thermal power pollution. Furthermore, the power provided by renewable energy power equipment for each phase can be more balanced, which helps improve the three-phase balance.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and not limiting of the present invention. Other features and aspects of the present invention will become more apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without inventive work.

[0022] Figure 1 A flowchart of a renewable energy distribution network access optimization control method according to an embodiment of the present invention is exemplarily shown;

[0023] Figure 2 A block diagram of a renewable energy distribution network access optimization control system according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0026] Figure 1 A flow chart of a method for optimizing control of renewable energy distribution network access according to an embodiment of the present invention is exemplarily shown. The method includes:

[0027] Step S101, obtaining the generated power and first phase information of multiple renewable energy power equipment at the i-th moment;

[0028] Step S102, obtaining the operating power, voltage and second phase information of the power grid at the i-th moment;

[0029] Step S103, determining access phase information of the multiple renewable energy power devices according to the second phase information of the grid power and the first phase information of the multiple renewable energy power devices;

[0030] Step S104, determining access voltages of multiple renewable energy power devices based on the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power;

[0031] Step S105, determining the access power of the multiple renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the multiple renewable energy power devices;

[0032] Step S106: Control the power access of multiple renewable energy power devices to the grid based on the access phase information, the access voltage, and the access power, so as to provide power to the grid during the time period between the i-th moment and the i+1-th moment.

[0033] According to an embodiment of the present invention, the renewable energy distribution network access optimization control method can calculate the first phase information based on the second phase information of the power grid and the first phase information of various renewable energy power devices, thereby determining the appropriate access phase information and reducing the probability of phase confusion. Furthermore, the access voltage and access power can be further calculated based on the access phase information, reducing the probability of three-phase imbalance, maximizing the use of renewable energy, reducing thermal power pollution, and improving energy utilization.

[0034] According to one embodiment of the present invention, in step S101, the renewable energy power equipment may include power equipment corresponding to multiple types of renewable energy sources, such as wind turbines, hydropower generators, and photovoltaic generators. The generated power of each type of renewable energy power equipment may vary depending on specific circumstances. For example, the generated power of a wind turbine may vary with wind speed. Therefore, the generated power of the renewable energy power equipment may vary moment by moment, and thus, its generated power at the i-th moment may be detected. Furthermore, after passing through some electrical or electronic equipment, this generated power may form alternating current (AC) with a frequency consistent with that of the power grid. Its phase is represented by first phase information, which may be inconsistent with second phase information of the power grid. Therefore, subsequent calculations may be performed to determine its access phase information, thereby aligning it as closely as possible with the phase of the power grid and reducing the probability of phase mismatch.

[0035] According to one embodiment of the present invention, in step S102, the operating power, voltage and second phase information of the grid power at the i-th moment can be obtained as the data basis for subsequent calculation of the access phase information, access voltage and access power of the renewable energy power equipment.

[0036] According to one embodiment of the present invention, in step S103, the second phase information and the first phase information obtained above can be used to determine the access phase information of multiple renewable energy power equipment, so that the access phase information of the renewable energy power equipment is consistent with the second phase information of the power grid, reducing the probability of phase confusion.

[0037] According to one embodiment of the present invention, step S103 may include: obtaining the phase information of the three-phase voltage of the grid power based on the second phase information of the grid power, wherein the phase difference between the phases of each phase voltage is 120°; determining the phase information of the three-phase voltage that is closest to the first phase information among the phase information of the three-phase voltage as the target phase information; and determining the target phase information as the access phase information of the renewable energy power equipment.

[0038] According to one embodiment of the present invention, the phase information of the three-phase voltage of the grid power is the second phase information, the phase difference between the voltages of each phase is 120 degrees, and the voltage and power of each phase are equal, and the three phases are balanced.

[0039] According to one embodiment of the present invention, the phase information closest to the first phase information can be determined in the phase information of the three-phase voltage as the access phase information of the renewable energy power equipment, and can also be used as the target phase information after the first phase information is transformed.

[0040] According to one embodiment of the present invention, in step S104, the access voltage of each renewable energy power device may be determined based on the access phase information determined above, as well as the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power. Thus, on the basis of the access phase information being consistent with the phase of the three-phase voltage of the grid, the amplitude of the three-phase voltage is ensured to be provided as much as possible by the renewable energy power device, and the amplitudes of the three-phase voltages are similar or equal, thereby achieving three-phase balance.

[0041] According to one embodiment of the present invention, step S104 may include: determining the access voltage optimization constraint based on the access phase information, the first phase information, the generated power of the renewable energy power equipment, the operating power of the grid power and the voltage of the grid power; determining the access voltage optimization function; and determining the access voltages of multiple renewable energy power equipment based on the access voltage optimization constraint and the access voltage optimization function.

[0042] According to one embodiment of the present invention, determining an access voltage optimization constraint condition based on the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power includes: determining the access voltage optimization constraint condition based on formulas (1), (2), (3), (4), (5), (6), (7), (8), and (9),

[0043]

[0044]

[0045]

[0046]

[0047]

[0048]

[0049] U j , 1≤U g (7)

[0050] U j , 2≤U g (8)

[0051] U j , 3≤U g (9)

[0052] Among them, U j , 1 is the access voltage of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, U j , 2 is the access voltage of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, U j , 3 is the access voltage of the jth renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, θ j , 1 is the first phase information of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, θ j , 2 is the first phase information of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, θ j , 3 is the first phase information of the jth renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage, t i is the i-th moment, f is the frequency of the power grid, U g is the voltage of the grid power, θ1 is the first phase information of the three-phase voltage, λ2 is the second phase information of the three-phase voltage, λ3 is the third phase information of the three-phase voltage, n1 is the number of renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, n2 is the number of renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, n3 is the number of renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, P j , 1 is the generated power of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, P j , 2 is the generated power of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, P j , 3 is the generated power of the jth renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage, I j ,1, max is the maximum current value of the j-th renewable energy power device whose target phase information is the first phase information of the three-phase voltage, I j ,1, min is the minimum current value of the j-th renewable energy power device whose target phase information is the first phase information of the three-phase voltage, I j , 2, maxis the maximum current value of the j-th renewable energy power device whose target phase information is the second phase information of the three-phase voltage, I j , 2, min is the minimum current value of the j-th renewable energy power device whose target phase information is the second phase information of the three-phase voltage, I j ,3, max is the maximum current value of the j-th renewable energy power device whose target phase information is the third phase information of the three-phase voltage, I j ,3, min is the minimum current value of the j-th renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage, and α1, α2 and α3 are proportional coefficients less than 1.

[0053] According to one embodiment of the present invention, in formulas (1), (2), and (3), voltage optimization constraints can be set so that the sum of the access voltages of multiple renewable energy power devices whose target phase information is the first phase information of the three-phase voltage is close to the grid voltage, and the phase of the sum of the access voltages of the multiple renewable energy power devices is equal to the first phase information; the sum of the access voltages of multiple renewable energy power devices whose target phase information is the second phase information of the three-phase voltage is close to the grid voltage, and the phase of the sum of the access voltages of the multiple renewable energy power devices is equal to the second phase information; and the sum of the access voltages of multiple renewable energy power devices whose target phase information is the third phase information of the three-phase voltage is close to the grid voltage, and the phase of the sum of the access voltages of the multiple renewable energy power devices is equal to the third phase information. Solving the access voltage under these constraints can ensure that the access phase information of the multiple renewable energy power devices always matches the phase of the grid power.

[0054] According to one embodiment of the present invention, in formulas (4), (5) and (6), the constraints of the generated power of each renewable energy power device and its access voltage are shown. The ratio of the generated power to its access voltage is the theoretical current value output by the renewable energy power device, which is also the current output capacity of the renewable energy power device. The theoretical current value is limited between the minimum current value and the maximum current value of the renewable energy power device.

[0055] According to one embodiment of the present invention, in formulas (7), (8) and (9), there are constraints on the access voltage of each renewable energy power device, that is, the access voltage of a single renewable energy power device is less than or equal to the voltage of the grid power.

[0056] In this way, voltage optimization constraints can be set so that the access phase information of multiple renewable energy power equipment is always consistent with the phase of the grid power, and the sum of the access voltages of multiple renewable energy power equipment is close to the grid voltage, reducing the probability of phase confusion, and increasing the proportion of renewable energy in the power supply, reducing thermal power pollution, and improving energy utilization.

[0057] According to one embodiment of the present invention, determining the access voltage optimization function includes: determining the access voltage optimization function according to formulas (10), (11), (12) and (13),

[0058] min(1-α1)(10)

[0059] min(1-α2)(11)

[0060] min(1-α3)(12)

[0061] min[max(α1,α2,α3)-min(α1,α2,α3)](13)

[0062] Among them, min is the minimum function and max is the maximum function.

[0063] According to one embodiment of the present invention, formulas (10), (11) and (12) can represent the degree of closeness between the voltage provided by each phase of the three-phase voltage provided by the renewable energy power equipment and the voltage of the grid power. The closer α1, α2 and α3 are to 1, the higher the closeness is. In addition, the smaller the proportion of the voltage provided by thermal power, the more thermal power pollution can be reduced.

[0064] According to one embodiment of the present invention, formula (13) can represent whether the above-mentioned proximity of the three-phase voltages is uniform. The smaller the difference between the maximum and minimum values ​​of α1, α2, and α3, the more consistent the above-mentioned proximity of the phase voltages. Conversely, the above-mentioned proximity deviation of the phase voltages is large. Formula (13) can minimize the difference between the maximum and minimum values ​​of α1, α2, and α3, thereby making the above-mentioned proximity of the phase voltages more consistent, which is conducive to the balance of the three-phase voltages.

[0065] According to one embodiment of the present invention, after obtaining the above-mentioned access voltage optimization constraints and access voltage optimization function, the optimal solution of the access voltage of the renewable energy power equipment can be solved by optimization algorithms such as particle swarm optimization algorithm and genetic algorithm as the specific value of the access voltage of the renewable energy power equipment.

[0066] In this way, the access voltage optimization function can be set to make the voltage provided by renewable energy power equipment account for a higher proportion, reduce the proportion of voltage provided by thermal power, reduce thermal power pollution, and make the voltage of each phase in the three-phase voltage more balanced.

[0067] According to one embodiment of the present invention, in step S105, the access power of multiple renewable energy power equipment can be determined so that after the renewable energy power equipment is connected, the power of each phase of the power grid is balanced, and as much power of each phase as possible is provided by the renewable energy power equipment, so as to reduce the power proportion of thermal power and reduce thermal power pollution.

[0068] According to one embodiment of the present invention, step S105 may include: determining the access power optimization constraint conditions based on the access voltage, the operating power of the grid power and the generated power of the multiple renewable energy power equipment; determining the access power optimization function based on the operating power of the grid power; and determining the access power of the multiple renewable energy power equipment based on the access power optimization constraint conditions and the access power optimization function.

[0069] According to one embodiment of the present invention, determining access power optimization constraints based on the access voltage, the operating power of the grid power, and the generated power of the multiple renewable energy power devices includes: determining the access power optimization constraints based on formulas (14), (15), (16), (17), (18), (19), (20), (21), and (22),

[0070] U j , 1I j , 1=P j ,1, in (14)

[0071] U j , 2I j ,2=P j , 2, in (15)

[0072] U j , 3I j ,3=P j ,3, in (16)

[0073] 0≤P j ,1, in ≤P j ,1(17)

[0074] 0≤P j , 2, in ≤P j ,2(18)

[0075] 0≤P j ,3, in ≤P j , 3(19)

[0076] I j ,1, min ≤I j , 1≤I j ,1, max (20)

[0077] I j , 2, min ≤I j , 2≤I j , 2, max (twenty one)

[0078] I j ,3, min ≤I j , 3≤I j ,3, max (twenty two)

[0079] Among them, P j ,1, in is the access power of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, P j , 2, in is the access power of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, P j ,3, in is the access power of the jth renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, I j , 1 is the access current of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, I j , 2 is the access current of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, I j , 3 is the access current of the j-th renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage.

[0080] According to one embodiment of the present invention, formulas (14), (15), and (16) can determine the relationship between the access voltage and the access power, that is, the sum of the access voltage and the access current is equal to the access power. Furthermore, formulas (17), (18), and (19) can limit the access power, that is, the access power is greater than or equal to 0 and less than or equal to the generated power of the renewable energy power equipment. Formulas (20), (21), and (22) limit the access current, that is, the access current is less than or equal to the maximum current value and greater than or equal to the minimum current value.

[0081] In this way, the relationship between access voltage and access power can be restricted by access power optimization constraints, and the value range of access power and access current can be limited by access current and access power constraints, so that the access power is within a reasonable range.

[0082] According to one embodiment of the present invention, determining an access power optimization function according to the operating power of the grid power includes: determining the access power optimization function according to formulas (23), (24), (25) and (26),

[0083]

[0084]

[0085]

[0086]

[0087] Wherein, P is the operating power of the power grid, min is the minimum value function, and max is the maximum value function.

[0088] According to one embodiment of the present invention, formulas (23), (24), and (25) can be used to determine the difference between the sum of the power provided by renewable energy power equipment for each phase and the operating power of each phase of the grid power. Minimizing this difference allows the operating power of each phase of the grid power to be provided as much as possible by renewable energy power equipment, thereby reducing the proportion of power generated by thermal power and reducing thermal power pollution. Formula (26) is the difference between the maximum and minimum values ​​of the sum of the power provided by renewable energy power equipment for each phase. The smaller this difference, the more balanced the power provided by the renewable energy power equipment for each phase. Therefore, formula (26) can be minimized, resulting in a higher degree of three-phase balance.

[0089] According to one embodiment of the present invention, after obtaining the above-mentioned access power optimization constraints and access power optimization function, the optimal solution of the access power of the renewable energy power equipment can be solved by optimization algorithms such as particle swarm optimization algorithm and genetic algorithm, as the specific numerical value of the access power of the renewable energy power equipment.

[0090] In this way, the power provided by renewable energy power equipment for each phase can be optimized by accessing the power optimization function, thereby increasing the power proportion of renewable energy, reducing the power proportion of thermal power, reducing thermal power pollution, and making the power provided by renewable energy power equipment for each phase more balanced, which is conducive to improving the balance of three phases.

[0091] According to one embodiment of the present invention, in step S106, the access phase information, access voltage and access power of each renewable energy power device are obtained above, and the power of multiple renewable energy power devices can be connected to the power grid according to the above access phase information, access voltage and access power to provide electricity in the time period between the i-th moment and the i+1-th moment, thereby reducing the utilization rate of thermal power and improving energy utilization.

[0092] According to an embodiment of the present invention, a renewable energy distribution network access optimization control method can calculate the first phase information based on the second phase information of the power grid and the first phase information of multiple renewable energy power devices, thereby determining appropriate access phase information and reducing the probability of phase confusion. Furthermore, access voltage and access power can be further calculated based on the access phase information, reducing the probability of three-phase imbalance, maximizing the use of renewable energy, reducing thermal power pollution, and improving energy efficiency. When determining the access voltage, voltage optimization constraints can be set to ensure that the access phase information of multiple renewable energy power devices always aligns with the phase of the power grid, and that the sum of the access voltages of the multiple renewable energy power devices is close to the grid voltage. This reduces the probability of phase confusion, increases the proportion of renewable energy in the power supply, reduces thermal power pollution, and improves energy efficiency. Furthermore, an access voltage optimization function is set to ensure that the voltage provided by renewable energy devices accounts for a higher proportion, while reducing the proportion of voltage provided by thermal power, reducing thermal power pollution, and achieving more balanced voltage across the three phases. When determining access power, access power optimization constraints can be used to constrain the relationship between access voltage and access power. Constraints on access current and access power can then be used to limit the range of access power and access current, ensuring that access power falls within a reasonable range. Furthermore, the access power optimization function can be used to optimize the power provided by renewable energy power equipment for each phase, thereby increasing the proportion of renewable energy power, reducing the proportion of thermal power power, and reducing thermal power pollution. Furthermore, the power provided by renewable energy power equipment for each phase can be more balanced, which helps improve the three-phase balance.

[0093] Figure 2 A block diagram of a renewable energy distribution network access optimization control system according to an embodiment of the present invention is exemplarily shown. The system includes:

[0094] A first acquisition module is used to obtain the generated power and first phase information of multiple renewable energy power equipment at the i-th moment;

[0095] A second acquisition module is used to obtain the operating power, voltage and second phase information of the power grid at the i-th moment;

[0096] an access phase information module, configured to determine access phase information of the plurality of renewable energy power devices based on the second phase information of the grid power and the first phase information of the plurality of renewable energy power devices;

[0097] an access voltage module, configured to determine access voltages of a plurality of renewable energy power devices according to the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power;

[0098] an access power module, configured to determine access powers of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices;

[0099] An access module is used to control the power access of multiple renewable energy power equipment to the power grid based on the access phase information, the access voltage and the access power, and to provide power to the power grid in the time period between the i-th moment and the i+1-th moment.

[0100] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A renewable energy distribution network access optimization control method, characterized in that: include: Obtaining the generated power and first phase information of multiple renewable energy power equipment at the i-th moment; Obtaining the operating power, voltage and second phase information of the power grid at the i-th moment; Obtaining phase information of three-phase voltages of the power grid according to the second phase information of the power grid, wherein a phase difference of each phase voltage is 120°; determining, among the phase information of the three-phase voltages, the phase information of the three-phase voltages that is closest to the first phase information as the target phase information; Determining the target phase information as access phase information of the renewable energy power device; Determining an access voltage optimization constraint condition according to the access phase information, the first phase information, the generated power of the renewable energy power device, the operating power of the grid power, and the voltage of the grid power; Determine the access voltage optimization function; Determining access voltages of a plurality of renewable energy power devices according to the access voltage optimization constraint and the access voltage optimization function; Determining access powers of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices; According to the access phase information, the access voltage and the access power, the power access of multiple renewable energy power equipment to the power grid is controlled to provide power to the power grid in the time period between the i-th moment and the i+1-th moment.

2. The renewable energy distribution network access optimization control method according to claim 1, characterized in that: Determining access voltage optimization constraints according to the access phase information, the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power includes: According to the formula IN j，1 ≤U g IN j，2 ≤U g IN j，3 ≤U g Determine the access voltage optimization constraints, where U j，1 is the access voltage of the jth renewable energy power equipment whose target phase information is the first phase information among the three-phase voltages, U j，2 is the access voltage of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, U j，3 is the access voltage of the jth renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, θ j，1 is the first phase information of the jth renewable energy power device whose target phase information is the first phase information of the three-phase voltage, θ j，2 is the first phase information of the jth renewable energy power device whose target phase information is the second phase information of the three-phase voltage, θ j，3 is the first phase information of the jth renewable energy power device whose target phase information is the third phase information of the three-phase voltage, t i is the i-th moment, f is the frequency of the power grid, U g is the voltage of the grid power, θ1 is the first phase information of the three-phase voltage, θ2 is the second phase information of the three-phase voltage, θ3 is the third phase information of the three-phase voltage, n1 is the number of renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, n2 is the number of renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, n3 is the number of renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, P j，1 is the generated power of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, P j，2 is the generated power of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, P j，3 is the generated power of the jth renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, I j，1，max is the maximum current value of the j-th renewable energy power device whose target phase information is the first phase information of the three-phase voltage, I j，1，min is the minimum current value of the j-th renewable energy power device whose target phase information is the first phase information of the three-phase voltage, I j，2，max is the maximum current value of the j-th renewable energy power device whose target phase information is the second phase information of the three-phase voltage, I j，2，min is the minimum current value of the j-th renewable energy power device whose target phase information is the second phase information of the three-phase voltage, I j，3，max is the maximum current value of the j-th renewable energy power device whose target phase information is the third phase information of the three-phase voltage, I j，3，min is the minimum current value of the j-th renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage, and α1, α2 and α3 are proportional coefficients less than 1.

3. The renewable energy distribution network access optimization control method according to claim 2, characterized in that: Determine the access voltage optimization function, including: According to the formula min(1-α1) min(1-α2) min(1-α3) min[max(α1,α2,α3)-min(α1,α2,α3)] Determine the access voltage optimization function, where min is the minimum value function and max is the maximum value function.

4. The renewable energy distribution network access optimization control method according to claim 2, characterized in that: Determining the access power of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices includes: Determining access power optimization constraints based on the access voltage, the operating power of the grid power, and the generated power of the multiple renewable energy power devices; Determining an access power optimization function according to the operating power of the grid power; The access powers of the various renewable energy power equipment are determined according to the access power optimization constraint condition and the access power optimization function.

5. The renewable energy distribution network access optimization control method according to claim 4, characterized in that: Determining access power optimization constraints based on the access voltage, the operating power of the grid power, and the generated power of the multiple renewable energy power devices includes: According to the formula IN j，1 AND j，1 =P j，1，in IN j，2 AND j，2 =P j，2，in IN j，3 AND j，3 =P j，3，in 0≤P j，1，in ≤P j，1 0≤P j，2，in ≤P j，2 0≤P j，3，in ≤P j，3 I j，1，min ≤I j，1 ≤I j，1，max I j，2，min ≤I j，2 ≤I j，2，max I j，3，min ≤I j，3 ≤I j，3，max Determine the access power optimization constraints, where P j，1，in is the access power of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, P j，2，in is the access power of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, P j，3，in is the access power of the jth renewable energy power equipment whose target phase information is the third phase information of the three-phase voltage, I j，1 is the access current of the jth renewable energy power equipment whose target phase information is the first phase information of the three-phase voltage, I j，2 is the access current of the jth renewable energy power equipment whose target phase information is the second phase information of the three-phase voltage, I j，3 is the access current of the j-th renewable energy power equipment whose target phase information is the third phase information in the three-phase voltage.

6. The renewable energy distribution network access optimization control method according to claim 5, characterized in that: Determining an access power optimization function according to the operating power of the grid power includes: According to the formula An access power optimization function is determined, where P is the operating power of the grid power, min is a minimum value function, and max is a maximum value function.

7. A renewable energy distribution network access optimization control system, used to execute the method according to any one of claims 1 to 6, characterized in that: include: A first acquisition module is used to obtain the generated power and first phase information of multiple renewable energy power equipment at the i-th moment; A second acquisition module is used to obtain the operating power, voltage and second phase information of the power grid at the i-th moment; an access phase information module, configured to determine access phase information of the plurality of renewable energy power devices based on the second phase information of the grid power and the first phase information of the plurality of renewable energy power devices; an access voltage module, configured to determine access voltages of a plurality of renewable energy power devices according to the first phase information, the generated power of the renewable energy power device, and the voltage of the grid power; an access power module, configured to determine access powers of the plurality of renewable energy power devices according to the access voltage, the operating power of the grid power, and the generated power of the plurality of renewable energy power devices; An access module is used to control the power access of multiple renewable energy power equipment to the power grid based on the access phase information, the access voltage and the access power, and to provide power to the power grid in the time period between the i-th moment and the i+1-th moment.

Images