A new energy system and a power scheduling method thereof

Abstract

This application provides a new energy system and its power dispatching method. After determining the dominant interconnection section between the new energy system and the power grid, the method determines a first influencing factor on the power flow change of the dominant interconnection section due to changes in the active power injection of the new energy generation units; and / or, a second influencing factor on the power flow change of the dominant interconnection section due to changes in the active power consumption of the receiving units. Then, the operation of the corresponding new energy generation units is controlled according to the first influencing factor, and / or the operation of the corresponding receiving units is controlled according to the second influencing factor. That is, when the system requires power dispatching, the operation control of the new energy generation units and / or receiving units is based on the impact of their own active power changes on the power flow change of the dominant interconnection section, in order to maintain system safety and stability and achieve optimized dispatching of new energy power.

Description

Technical Field

[0001] This application relates to the field of new energy power generation technology, and in particular to a new energy system and its power dispatching method. Background Technology

[0002] Wind, solar, and hydrogen energy are clean new energy sources, and the interconversion between these sources can provide convenience for human production and daily life. However, achieving high absorption and dispatch of these new energy sources remains a challenge. Currently, existing research on new energy power dispatch mainly considers economic costs and benefits, without addressing the system safety and stability issues caused by changes in new energy power. Summary of the Invention

[0003] In view of this, this application provides a new energy system and its power scheduling method to balance system safety and stability and achieve optimized scheduling of new energy power.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] The first aspect of this application provides a power dispatching method for a new energy system, wherein the new energy system includes at least one new energy power generation unit and / or at least one power receiving unit, and the power dispatching method includes:

[0006] Determine the dominant connection section between the new energy system and the power grid;

[0007] Determine the first influencing factor of the change in active power injection of the new energy power generation unit on the power flow change of the dominant interconnection section; and / or, determine the second influencing factor of the change in active power consumption of the power receiving unit on the power flow change of the dominant interconnection section.

[0008] The operation of the corresponding new energy power generation unit is controlled according to the first influencing factor, and / or the operation of the corresponding power receiving unit is controlled according to the second influencing factor.

[0009] Optionally, controlling the operation of the corresponding new energy power generation unit according to the first influencing factor includes:

[0010] Control the operation of the new energy power generation unit when the first influence factor is less than or equal to the first threshold.

[0011] Optionally, when the number of new energy power generation units is greater than 1, before operating the new energy power generation units where the first influence factor is less than or equal to the first threshold, the method further includes:

[0012] The new energy power generation units whose first impact factor is less than or equal to the first threshold are sorted by their operating priority in ascending order of the first impact factor.

[0013] Optionally, controlling the operation of the new energy power generation unit when the first influence factor is less than or equal to the first threshold includes:

[0014] The new energy power generation unit that controls the first influence factor to be less than or equal to the first threshold transmits its active power through the dominant interconnection section.

[0015] Optionally, before controlling the operation of the corresponding new energy power generation unit according to the first influencing factor, the method further includes:

[0016] Determine whether the new energy power generation unit has an active power surplus;

[0017] If it exists, then the step of controlling the operation of the corresponding new energy power generation unit according to the first influencing factor is executed.

[0018] Optionally, controlling the operation of the corresponding power receiving unit according to the second influencing factor includes:

[0019] The power receiving unit is controlled to operate when the second influence factor is greater than or equal to the second threshold.

[0020] Optionally, when the number of power receiving units is greater than 1, before controlling the operation of power receiving units whose second influence factor is greater than or equal to the second threshold, the method further includes:

[0021] The power receiving units whose second influence factor is greater than or equal to the second threshold are sorted by their operating priority in descending order of the second influence factor.

[0022] Optionally, the power receiving unit is a hydrogen production device; controlling the operation of the power receiving unit when the second influencing factor is greater than or equal to the second threshold includes:

[0023] The hydrogen production equipment is controlled to either produce hydrogen or be in standby mode when the second influencing factor is greater than or equal to the second threshold.

[0024] Optionally, if the new energy system includes at least one new energy power generation unit and at least one power receiving unit, then: when the step of controlling the operation of the power receiving unit where the second influence factor is greater than or equal to the second threshold ends, the step of controlling the operation of the corresponding new energy power generation unit according to the first influence factor stops.

[0025] Optionally, the first influencing factor for determining the change in active power injection of the new energy power generation unit on the power flow change of the dominant interconnection section includes:

[0026] The active power injection of the new energy power generation unit is perturbed, and the corresponding power flow perturbation of the dominant interconnection section is obtained;

[0027] The ratio of the tidal perturbation to the active power injection perturbation of the corresponding new energy power generation unit is used as the first influencing factor.

[0028] Optionally, a second influencing factor on the power flow change of the dominant interconnection section, determined by the change in the active power consumption of the power receiving unit, includes:

[0029] The active power consumption of the power receiving unit is perturbed, and the corresponding power flow perturbation amount of the dominant connection section is obtained;

[0030] The ratio of the power flow perturbation to the active power consumption perturbation of the corresponding power receiving unit is used as the second influencing factor.

[0031] Optionally, the dominant connection section between the new energy system and the power grid is determined to be executed periodically according to the power grid operation cycle.

[0032] Optionally, the dominant connection segment between the new energy system and the power grid is determined, including periodically executed actions:

[0033] Obtain the current power grid topology.

[0034] Based on the fault probabilities of the new energy system under the described power grid topology, a set of anticipated faults is selected.

[0035] Transient power angle stability analysis is performed based on the anticipated fault set to identify the dominant connection section.

[0036] Optionally, the power grid operation cycle is 15 minutes.

[0037] A second aspect of this application provides a new energy system, comprising: a control system, and at least one new energy power generation unit and / or at least one power receiving unit; wherein,

[0038] The new energy power generation unit is directly or indirectly connected to the power grid;

[0039] The power receiving unit is directly or indirectly connected to the power grid;

[0040] The control system is used to communicate with the new energy power generation unit and / or the power receiving unit, and to execute the power scheduling method of the new energy system as described in any of the first aspects above.

[0041] Optionally, the number of the new energy power generation units is greater than 1; and / or, the number of the power receiving units is greater than 1.

[0042] Optionally, the new energy power generation unit is: a wind power generation unit, or a photovoltaic power generation unit;

[0043] When the number of new energy power generation units is greater than 1, each new energy power generation unit is: a wind power generation unit and / or a photovoltaic power generation unit.

[0044] Optionally, the power receiving unit is: a hydrogen production device.

[0045] The power dispatching method for a new energy system provided in this application, after determining the dominant interconnection section between the new energy system and the power grid, determines the first influencing factor of the change in active power injection of the new energy generation unit on the power flow change of the dominant interconnection section; and / or, determines the second influencing factor of the change in active power consumption of the receiving unit on the power flow change of the dominant interconnection section; then, controls the operation of the corresponding new energy generation unit according to the first influencing factor, and / or controls the operation of the corresponding receiving unit according to the second influencing factor. That is, when the system needs to perform power dispatching, the operation control of the new energy generation unit and / or receiving unit is based on the impact of its own active power changes on the power flow change of the dominant interconnection section, in order to maintain system safety and stability and achieve optimized dispatching of new energy power. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0047] Figure 1 A flowchart of a power scheduling method for a new energy system provided in an embodiment of this application;

[0048] Figure 2 Another flowchart of the power scheduling method for a new energy system provided in the embodiments of this application;

[0049] Figure 3 Another flowchart of the power scheduling method for a new energy system provided in the embodiments of this application;

[0050] Figure 4 A partial flowchart of the power scheduling method for a new energy system provided in this application embodiment;

[0051] Figure 5 This is a schematic diagram of the structure of a new energy system provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0054] This application provides a power scheduling method for a new energy system to balance system safety and stability and achieve optimized scheduling of new energy power.

[0055] This new energy system may include only one new energy power generation unit, or only one power receiving unit; wherein the new energy power generation unit and the power receiving unit are directly or indirectly connected to the power grid through corresponding transformers. The new energy power generation unit refers to a wind power generation unit or a photovoltaic power generation unit, and the power receiving unit may specifically be a hydrogen production device.

[0056] In practical applications, the uncertainty and anti-peak-shaving characteristics of wind and solar power output have led to severe wind and solar power curtailment in some areas, becoming one of the main technical bottlenecks restricting the development of wind and solar power. Hydrogen energy, with its high calorific value, ease of storage, environmental friendliness, and wide range of sources and applications, has attracted considerable attention. Furthermore, combined with mature hydrogen storage technology, hydrogen energy can be fed back into electrical and thermal energy systems through fuel cells, thereby achieving hydrogen energy utilization. Therefore, utilizing surplus wind and solar power for hydrogen production, such as considering the reverse distribution of wind-rich areas and hydrogen load centers and using surplus wind and solar power for distributed hydrogen production, can effectively promote large-scale wind power utilization in the future power grid. That is, this new energy system can also simultaneously include: at least one new energy power generation unit and at least one power receiving unit.

[0057] Regardless of the specific types of units included in the new energy system, or the number of each type of unit, the power dispatching method of the new energy system is as follows: Figure 1 As shown, it specifically includes:

[0058] S101. Determine the dominant connection section between the new energy system and the power grid.

[0059] In this new energy system, the new energy power generation units and power receiving units are connected to the power grid, and there is at least one transmission line between their respective areas and the power grid. The cross-section of these lines is the aforementioned dominant interconnection section. When any unit in the new energy system experiences a power change, it may cause a change in the power of the dominant interconnection section. Moreover, due to factors such as the actual connection location and application scenario, the impact of power changes in each unit on the power of the dominant interconnection section will vary. Therefore, step S102 can be executed.

[0060] S102. Determine the first influencing factor of the change in active power injection of the new energy power generation unit on the power flow change of the dominant interconnection section; and / or, determine the second influencing factor of the change in active power consumption of the power receiving unit on the power flow change of the dominant interconnection section.

[0061] When the new energy system includes only at least one new energy power generation unit, step S102 is to determine the first influencing factor; when the new energy system includes only at least one power receiving unit, step S102 is to determine the second influencing factor; when the new energy system includes both at least one new energy power generation unit and at least one power receiving unit, step S102 is to determine the first influencing factor and the second influencing factor.

[0062] It should be noted that in practical applications, if it is necessary to determine the first influencing factor and the second influencing factor in step S102, the two can be executed simultaneously or sequentially, and the execution order is not limited; as long as the dominant connecting section is determined, step S102 can be executed. Figure 1 The example shown is that both can be executed simultaneously, but in actual applications they can be executed sequentially, depending on the specific application environment, and all are within the scope of protection of this application.

[0063] Taking the example of a new energy system that includes at least one new energy power generation unit and at least one power receiving unit, when the new energy system needs to perform power dispatch, such as when there is surplus power, if only economic benefits are considered when selecting the corresponding new energy power generation unit to send its output power to the corresponding power receiving unit, it is possible that a new energy power generation unit with a large impact on the power flow of the dominant interconnection section will be selected, thereby affecting the safety and stability of the system; it is also possible that a power receiving unit with poor surplus power absorption capacity will be selected, leading to the accumulation of surplus power, which will also affect the safety and stability of the system. Therefore, in this embodiment, after determining the dominant interconnection section, the first influence factor and the second influence factor are determined through the above step S102 as a reference for controlling the power changes of each unit in the new energy system, and then step S103 can be executed.

[0064] S103. Control the operation of the corresponding new energy power generation unit according to the first influencing factor, and / or control the operation of the corresponding power receiving unit according to the second influencing factor.

[0065] Taking the example of a new energy system that includes at least one new energy power generation unit and at least one power receiving unit, under normal circumstances, the active power output by each new energy power generation unit is used for grid connection. When there is surplus power in the system, some new energy power generation units, such as those with a smaller first impact factor, will send their output active power to power receiving units, such as hydrogen production equipment with a larger second impact factor. In this way, at least one hydrogen production equipment will be used to produce hydrogen to achieve energy storage, avoid wind and solar curtailment, and at the same time realize the consumption of surplus power as soon as possible to ensure the safety and stability of the system.

[0066] If the new energy system includes only one new energy power generation unit, then when the new energy system needs to perform power dispatch, such as power rationing, the new energy power generation unit with the smaller first impact factor can be controlled to operate, while the new energy power generation unit with the larger first impact factor can be controlled to stop operating, so as to ensure the safety and stability of the system.

[0067] If the new energy system includes only one power receiving unit, then when the new energy system needs to perform power dispatch, such as increasing the energy storage power, the power receiving unit with a larger second influencing factor can be controlled to operate, while the power receiving unit with a smaller second influencing factor can be controlled to stop operating, so as to ensure the safety and stability of the system.

[0068] The power dispatching method for the new energy system provided in this embodiment, after determining the dominant interconnection section between the new energy system and the power grid, determines the first influencing factor of the change in active power injection of the new energy generation unit on the power flow change of the dominant interconnection section; and / or, determines the second influencing factor of the change in active power consumption of the receiving unit on the power flow change of the dominant interconnection section; then, controls the operation of the corresponding new energy generation unit according to the first influencing factor, and / or controls the operation of the corresponding receiving unit according to the second influencing factor. That is, when the system needs to perform power dispatching, this power dispatching method, for the first time, considers the system's safety and stability and provides an optimized dispatching scheme. Its operation control of the new energy generation unit and / or receiving unit is based on the influence of its own active power changes on the power flow change of the dominant interconnection section, so as to maintain the system's safety and stability and achieve optimized dispatching of new energy power.

[0069] In practical applications, the determination of the first influencing factor on the power flow changes of the dominant interconnection section by the change in active power injection of the new energy power generation unit in step S102 can specifically include... Figure 2 As shown:

[0070] S211, inject active power into the perturbation new energy power generation unit and obtain the corresponding power flow perturbation of the dominant connection section.

[0071] The perturbation of active power can specifically be an increase or decrease of a small amount of active power. The direction of adjustment and the specific amount of adjustment can be determined according to the application environment, and are not limited here. All of them are within the protection scope of this application.

[0072] In practical applications, the active power injection of new energy power generation unit i (i = 1…n, where n is the number of new energy power generation units in the new energy system) can be increased, that is, a perturbation active power output increment ΔP can be applied to it. W / P.i Taking the direction of power grid connection as positive, then ΔP W / P.i >0; then perform power flow calculations to obtain the power flow perturbation ΔP at the dominant interconnection section of the power grid. C If the tidal perturbation ΔP C If the flow direction is the same as the original flow direction of the dominant connecting section, then ΔP C >0; if the tidal perturbation ΔP C If the flow direction is opposite to the original flow direction of the dominant tidal current at the connecting section, then ΔP C <0.

[0073] S212. The ratio of tidal perturbation to the active power injection perturbation of the corresponding new energy power generation unit is used as the first influencing factor.

[0074] For new energy power generation unit i, the ratio of its tidal perturbation to its active power injection perturbation is: This value is the first influencing factor of new energy power generation unit i.

[0075] Similarly, the second influencing factor in determining the change in active power consumption of the power receiving unit in step S102 on the power flow change of the dominant interconnection section may specifically include... Figure 2 As shown:

[0076] S221, Perturb the active power consumption of the power receiving unit and obtain the corresponding power flow perturbation of the dominant connection section.

[0077] In practical applications, the active power consumption of the power receiving unit j (i = 1…m, where m is the number of power receiving units in the new energy system) can be increased by applying a perturbation active power absorption increment ΔP. H.j Taking the direction of power grid connection as positive, then ΔP H.j <0; then power flow calculations are performed to obtain the power flow perturbation ΔP at the dominant interconnection section of the power grid. C If the tidal perturbation ΔP C If the flow direction is the same as the original flow direction of the dominant tidal current at the connecting section, then ΔP C>0; if the tidal perturbation ΔP C If the flow direction is opposite to the original flow direction of the dominant tidal current at the connecting section, then ΔP C <0.

[0078] S222. The ratio of power flow perturbation to the active power consumption perturbation of the corresponding power receiving unit is used as the second influencing factor.

[0079] For power receiving unit j, the ratio of its power flow perturbation to the corresponding active power consumption perturbation is: This value is the second influence factor of the power receiving unit j.

[0080] This embodiment obtains the power flow increase / decrease of the dominant interconnection section by perturbing the active power injection of each new energy power generation unit, thus obtaining the first influence factor of the surplus power grid-connected new energy power generation unit; and obtains the power flow increase / decrease of the dominant interconnection section by perturbing the active power consumption of each power receiving unit, thus obtaining the second influence factor of the power receiving unit.

[0081] In practical applications, the active power injection perturbation ΔP of new energy power generation units W / P.i and the active power consumption perturbation ΔP for the power receiving unit H.j The value of the active power injection perturbation of the new energy power generation unit and the active power consumption perturbation of the power receiving unit can be reduced, depending on the specific application environment, and are all within the protection scope of this application.

[0082] Based on the above embodiments, this embodiment provides some specific implementations of certain steps in the power dispatching method of the new energy system, such as... Figure 3 (in order to be in) Figure 1 As shown in the example (based on which the first influencing factor is used), step S103, which involves controlling the operation of the corresponding new energy power generation unit according to the first influencing factor, can specifically include:

[0083] S311. Control the operation of new energy power generation units whose first influence factor is less than or equal to the first threshold.

[0084] That is, regarding the first impact factor New energy power generation units that are less than or equal to the first threshold ε1 (ε1 > 0) can have their operation controlled; however, for the first influencing factor... If a new energy power generation unit exceeds the first threshold ε1, it will be controlled to stop operating, and this part of the wind / solar power generation will be abandoned.

[0085] In practical applications, step S311 may specifically include: controlling new energy power generation units whose first influence factor is less than or equal to the first threshold to transmit their own active power through the dominant interconnection section.

[0086] Furthermore, when the number of the new energy power generation units is greater than 1, the following can be executed before executing step S311:

[0087] S310. Sort the operation priority of each new energy power generation unit whose first impact factor is less than or equal to the first threshold according to the order of the first impact factor from small to large.

[0088] That is, regarding the first impact factor New energy power generation units less than or equal to the first threshold ε1 are classified according to various first influencing factors. The execution priorities are sorted in ascending order, and then step S311 is executed according to this order.

[0089] In addition, before executing step S103, which involves controlling the operation of the corresponding new energy power generation unit based on the first influencing factor, the following can be executed first:

[0090] S301. Determine whether the new energy power generation unit has an active power surplus.

[0091] If the first influencing factor exists, then step S103 is executed to control the operation of the corresponding new energy power generation unit according to the first influencing factor. If the first influencing factor does not exist, then it is not necessary to control the operation of the corresponding new energy power generation unit according to the first influencing factor.

[0092] The step S103, which involves controlling the operation of the corresponding power receiving unit based on the second influencing factor, may specifically include:

[0093] S321. Control the operation of power receiving units whose second influence factor is greater than or equal to the second threshold.

[0094] That is, regarding the second impact factor For power receiving units that are greater than or equal to the second threshold ε2 (ε2 < 0), their operation can be controlled; however, for the second influencing factor... If the power receiving unit is less than the second threshold ε2, it will be controlled to stop operating, and the corresponding residual power will be discarded.

[0095] When the power receiving unit is a hydrogen production equipment, step S321 specifically includes: controlling the hydrogen production equipment with a second influence factor greater than or equal to the second threshold to produce hydrogen or standby with heat.

[0096] Furthermore, when the number of powered units is greater than 1, the following can be executed before executing step S321:

[0097] S320. Sort the power receiving units whose second influence factor is greater than or equal to the second threshold according to the order of the second influence factor from largest to smallest in terms of operation priority.

[0098] That is, regarding the second impact factor For power receiving units that are greater than or equal to the second threshold ε2, according to each second influence factor Sort the execution priorities from largest to smallest, and then execute step S321 according to this order.

[0099] The following explanation will continue to use the example of a new energy system that simultaneously includes at least one new energy power generation unit and at least one power receiving unit, wherein the new energy power generation unit is a wind power generation unit or a photovoltaic power generation unit, and the power receiving unit is a hydrogen production device:

[0100] If the virtual power plant monitoring shows a surplus of active power at the wind / solar power generation station, then, based on the priority ranking of each new energy power generation unit (i.e., the priority ranking of surplus electricity fed into the grid), the active power generated by the new energy power generation unit is transmitted to a virtual hydrogen production center through the main interconnection section. Then, based on the priority ranking of each hydrogen production equipment (i.e., the priority ranking of surplus electricity consumption), the hydrogen production equipment is sequentially activated to produce hydrogen until the surplus active power is exhausted. Therefore, with the help of the power grid and the aforementioned virtual hydrogen production center, this embodiment can realize distributed hydrogen production from surplus wind and solar power based on virtual power plant scheduling.

[0101] It should be added that, in practical applications, if there are For new energy power generation units: even if the wind / solar power plant still has a surplus of active power, in order to meet the system's safety and stability requirements, the surplus power will not be transmitted to the virtual hydrogen production center, that is, step S311 will stop when it reaches the ratio. When the number of new energy power generation units exceeds the first threshold ε1, the power generation is stopped, and this part of the wind / solar power generation is abandoned.

[0102] Additionally, if it exists For hydrogen production equipment: even if the wind / solar power plant still has surplus active power and some hydrogen production equipment has not been started, in order to ensure system safety and stability, the surplus power will not be transmitted to the virtual hydrogen production center, and the remaining electrolysis hydrogen production devices will not be started. That is, step S321 will be executed until the ratio is reached. When the hydrogen production equipment's output is less than the second threshold ε2, both steps S311 and S321 cease. That is, even if the first influencing factor still exists, the process stops at the end of step S321. New energy power generation units that are less than or equal to the first threshold ε1 will no longer be operated to ensure the safety and stability of the system.

[0103] For distributed hydrogen production using surplus wind and solar power, this power dispatching method is the first to consider system safety and stability and proposes an optimized dispatching scheme. When the system has surplus power and needs to produce hydrogen, it controls the operation sequence of each new energy power generation unit and each hydrogen production equipment according to the order of the impact of its own active power changes on the power flow changes of the main interconnection section, so as to maintain system safety and stability as much as possible and achieve optimized dispatching for hydrogen production using surplus wind and solar power.

[0104] In practical applications, if there are new energy power generation units or hydrogen production equipment with the same priority ranking, the ranking can be further refined based on their respective economic benefits. For example, under the same priority ranking, a new energy power generation unit with higher output power for hydrogen production has a higher priority than a new energy power generation unit with higher output power for grid connection. And under the same priority ranking, hydrogen production equipment with higher hydrogen production benefits will have a higher priority than other hydrogen production equipment.

[0105] Based on the above embodiments, more preferably, in the power dispatching method of the new energy system, step S101 can be executed periodically according to the power grid operation cycle.

[0106] For details, see Figure 4 Step S101 includes the following periodically performed actions:

[0107] S401. Obtain the current power grid topology.

[0108] S402. Based on the probability of each fault in the new energy system under the power grid topology, select the set of anticipated faults.

[0109] In practical applications, a set of anticipated faults can be selected based on the probability of each fault and a fast screening method. The specific implementation of this fast screening method can be found in existing technologies, and will not be elaborated here.

[0110] S403. Perform transient power angle stability analysis based on the anticipated fault set to identify the dominant connection section.

[0111] The method used to obtain the dominant interconnection section of the power grid under the current operating cycle can also be found in existing technologies, and will not be elaborated here.

[0112] The power dispatching method provided in this embodiment first obtains the current grid topology and performs transient power angle stability analysis based on the current expected fault set to identify the dominant interconnection section of the grid. Then, it can perturb the active power injection of each new energy power generation unit to obtain the power flow increase / decrease of the dominant interconnection section and obtain the priority ranking of the new energy power generation units with surplus power connected to the grid under the current state. It can also perturb the active power consumption of each electrolysis hydrogen production equipment to obtain the power flow increase / decrease of the dominant interconnection section and obtain the priority ranking of the electrolysis hydrogen production equipment under the current state.

[0113] Taking the example of a new energy system that includes at least one new energy power generation unit and at least one power receiving unit, where the new energy power generation unit is a wind power generation unit or a photovoltaic power generation unit, and the power receiving unit is a hydrogen production equipment, then at any given time, if the virtual power plant monitoring shows a surplus of active power at the wind / solar power generation station, the active power generated by the new energy power generation unit is transmitted to the virtual hydrogen production center through the power grid according to the corresponding priority order; and the hydrogen production equipment is started sequentially according to another priority order to perform electrolysis hydrogen production until the surplus active power is exhausted; then, the system returns to step S101 when the next power grid operation cycle begins. If there is no surplus active power at any time, the system continues to maintain the operation mode of each wind / solar / hydro / thermal power generation unit, energy storage, controllable load, etc. in the virtual power plant, and returns to step S101 when the next power grid operation cycle begins.

[0114] Other specific processes and principles of this power scheduling method can be found in the above embodiments, and will not be repeated here.

[0115] Specifically, the power grid operation cycle can be set to 15 minutes. In this case, this embodiment can use 15 minutes as the power grid operation cycle to periodically update the power grid topology, the current set of anticipated faults, and obtain the dominant interconnection sections of the power grid under each operation cycle. Then, the two priority sortings can be periodically refreshed to ensure optimized scheduling to meet the system's safety and stability requirements.

[0116] In practical applications, the power grid operation cycle can also be set to other durations, depending on the specific application environment, and all of these are within the protection scope of this application.

[0117] Another embodiment of this application also provides a new energy system, which, as shown in the example below... Figure 5 As shown, it includes: a control system 20, and at least one new energy power generation unit 11 and / or at least one power receiving unit 12; Figure 5 The example shown here includes multiple new energy power generation units 11 and multiple power receiving units 12; among which:

[0118] The new energy power generation unit 11 and the power receiving unit 12 are directly or indirectly connected to the power grid, respectively. The new energy power generation unit 11 can be a wind power generation unit or a photovoltaic power generation unit; preferably, in this new energy system, there is at least one new energy power generation unit 11 that is a wind power generation unit and at least one new energy power generation unit 11 that is a photovoltaic power generation unit. The number of both depends on the specific application environment and is within the protection scope of this application.

[0119] The power receiving unit 12 can be an electrolytic hydrogen production device, but it is not limited to this. It can also be other forms of power receiving units in the prior art, depending on the specific application environment, and all of them are within the protection scope of this application.

[0120] The connection methods between each new energy power generation unit 11 and each power receiving unit 12 and the power grid can be referred to the existing technology, and no specific limitations are made here.

[0121] The control system 20 is used to communicate with each new energy power generation unit 11 and each power receiving unit 12, and to execute the power dispatching method of the new energy system as described in any of the above embodiments. Furthermore, when multiple new energy power generation units 11 and multiple power receiving units 12 are included at the same time, distributed hydrogen production based on wind and solar surplus electricity can also be carried out based on virtual power plant dispatching, and the virtual power plant dispatching can take into account the system safety and stability.

[0122] The specific process and principle of this power scheduling method can be found in the above embodiments, and will not be repeated here. For the specific implementation of the control system 20, please refer to the prior art, all of which are within the protection scope of this application.

[0123] Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0124] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0125] The features described above regarding the disclosed embodiments can be substituted for or combined with each other to enable those skilled in the art to implement or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power dispatching method for a new energy system, characterized in that, The new energy system includes at least one new energy power generation unit and / or at least one power receiving unit, and the power dispatching method includes: Determine the dominant connection section between the new energy system and the power grid. The dominant connection section is the cross section of the transmission line between the area where the new energy power generation unit and / or the power receiving unit is located and the power grid. Determine the first influencing factor of the change in active power injection of the new energy power generation unit on the power flow change of the dominant interconnection section; and / or, determine the second influencing factor of the change in active power consumption of the power receiving unit on the power flow change of the dominant interconnection section. The operation of the new energy power generation unit is controlled when the first influence factor is less than or equal to the first threshold, and the operation of the new energy power generation unit is stopped when the first influence factor is greater than the first threshold. And / or, The operation of the corresponding power receiving unit is controlled according to the second influencing factor.

2. The power dispatching method for a new energy system according to claim 1, characterized in that, When the number of new energy power generation units is greater than 1, before operating the new energy power generation units whose first influence factor is less than or equal to the first threshold, the method further includes: The new energy power generation units whose first impact factor is less than or equal to the first threshold are sorted by their operating priority in ascending order of the first impact factor.

3. The power dispatching method for a new energy system according to claim 1, characterized in that, Controlling the operation of the new energy power generation unit when the first influence factor is less than or equal to the first threshold includes: The new energy power generation unit that controls the first influence factor to be less than or equal to the first threshold transmits its active power through the dominant interconnection section.

4. The power dispatching method for a new energy system according to claim 1, characterized in that, Before controlling the operation of the corresponding new energy power generation unit according to the first influencing factor, the method further includes: Determine whether the new energy power generation unit has an active power surplus; If it exists, then the step of controlling the operation of the corresponding new energy power generation unit according to the first influencing factor is executed.

5. The power dispatching method for a new energy system according to claim 1, characterized in that, Controlling the operation of the corresponding power receiving unit according to the second influencing factor includes: The power receiving unit is controlled to operate when the second influence factor is greater than or equal to the second threshold.

6. The power dispatching method for a new energy system according to claim 5, characterized in that, When the number of power receiving units is greater than 1, before controlling the operation of power receiving units whose second influence factor is greater than or equal to the second threshold, the method further includes: The power receiving units whose second influence factor is greater than or equal to the second threshold are sorted by their operating priority in descending order of the second influence factor.

7. The power dispatching method for a new energy system according to claim 5, characterized in that, The power receiving unit is a hydrogen production device; controlling the operation of the power receiving unit when the second influencing factor is greater than or equal to the second threshold includes: The hydrogen production equipment is controlled to either produce hydrogen or be in standby mode when the second influencing factor is greater than or equal to the second threshold.

8. The power dispatching method for a new energy system according to claim 5, characterized in that, If the new energy system includes at least one new energy power generation unit and at least one power receiving unit, then: when the step of controlling the operation of the power receiving unit where the second influence factor is greater than or equal to the second threshold ends, the step of controlling the operation of the corresponding new energy power generation unit according to the first influence factor stops.

9. The power dispatching method for a new energy system according to any one of claims 1 to 8, characterized in that, The first influencing factor on the power flow change of the dominant interconnection section, determined by the change in active power injection of the new energy power generation unit, includes: The active power injection of the new energy power generation unit is perturbed, and the corresponding power flow perturbation of the dominant interconnection section is obtained; The ratio of the tidal perturbation to the active power injection perturbation of the corresponding new energy power generation unit is used as the first influencing factor.

10. The power dispatching method for a new energy system according to any one of claims 1 to 8, characterized in that, The second influencing factor on the power flow change of the dominant interconnection section, as determined by the change in active power consumption of the power receiving unit, includes: The active power consumption of the power receiving unit is perturbed, and the corresponding power flow perturbation amount of the dominant connection section is obtained; The ratio of the power flow perturbation to the active power consumption perturbation of the corresponding power receiving unit is used as the second influencing factor.

11. The power scheduling method for a new energy system according to any one of claims 1 to 8, characterized in that, The dominant connection section between the new energy system and the power grid is determined and is executed periodically according to the power grid operation cycle.

12. The power dispatching method for a new energy system according to claim 11, characterized in that, Determine the dominant connection point between the new energy system and the power grid, including periodically executed actions: Obtain the current power grid topology. Based on the fault probabilities of the new energy system under the described power grid topology, a set of anticipated faults is selected. Transient power angle stability analysis is performed based on the anticipated fault set to identify the dominant connection section.

13. The power dispatching method for a new energy system according to claim 11, characterized in that, The power grid operates for 15 minutes.

14. A new energy system, characterized in that, include: The control system, and at least one new energy power generation unit and / or at least one power receiving unit; wherein, The new energy power generation unit is directly or indirectly connected to the power grid; The power receiving unit is directly or indirectly connected to the power grid; The control system is used to communicate with the new energy power generation unit and / or the power receiving unit, and to execute the power dispatching method of the new energy system as described in any one of claims 1 to 13.

15. The new energy system according to claim 14, characterized in that, The number of the new energy power generation units is greater than 1; and / or the number of the power receiving units is greater than 1.

16. The new energy system according to claim 14 or 15, characterized in that, The new energy power generation unit is: a wind power generation unit, or a photovoltaic power generation unit; When the number of new energy power generation units is greater than 1, each new energy power generation unit is: a wind power generation unit and / or a photovoltaic power generation unit.

17. The new energy system according to claim 14 or 15, characterized in that, The power receiving unit is: hydrogen production equipment.

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