Active voltage support control method and device for new energy station, terminal equipment and storage medium

Abstract

The invention discloses a voltage active support control method and device for a new energy station, terminal equipment and a storage medium, multi-stage voltage threshold intervals are introduced, when the voltage corresponding to the new energy is in different voltage threshold intervals, different control strategies can be adopted, and when the voltage is in a first voltage threshold interval with a relatively low voltage, the voltage corresponding to the new energy is not in the first voltage threshold interval with the relatively low voltage. If so, increasing the power output of each device; when the voltage is in a second voltage threshold interval in the moderate range, the power of the power generation equipment and the discharge power of the energy storage equipment are kept in corresponding power ranges; and when the voltage is in a third voltage threshold interval with overhigh voltage, fine adjustment operation is carried out, and the voltage is reduced to a safe range in a safe and stable mode. Therefore, according to different voltage threshold intervals of the voltage, interval flexible adjustment control can be carried out, so that the control strategy can be more accurately matched with the actual state of the power grid voltage, and the stability and the reliability of the power grid are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage control of new energy equipment, and in particular to a voltage active support control method, device, terminal equipment and storage medium for a new energy station. Background Art

[0002] With the large-scale access of renewable energy power generation equipment (such as wind power and solar power) to the power grid, traditional voltage control methods are often difficult to adapt to the complex needs of renewable energy sites due to the intermittent and unstable output. Therefore, active voltage support control is needed to improve the stability and reliability of the power grid.

[0003] Since the output of new energy equipment is greatly affected by the environment, which may cause frequent fluctuations in the grid voltage, real-time monitoring and adjustment of equipment status through active voltage support control can reduce the voltage fluctuation range and keep the grid voltage at a more stable level. If a reasonable voltage support control strategy can be adopted, the working mode of new energy equipment can be optimized to avoid the equipment being in an inefficient or protective state due to excessively high or low voltage, thereby improving the utilization rate of the equipment and the power generation efficiency.

[0004] However, the existing technology only adopts a simple feedback control strategy when dealing with voltage support control, such as setting only a voltage threshold. When the grid voltage is lower than or higher than this threshold, the corresponding voltage support action is triggered, or the reactive output or load of the equipment is adjusted through proportional control (PI control) or proportional integral control (PI control) to maintain the grid voltage within a preset range. However, this control method lacks analysis and discrimination of different voltage intervals, that is, there is no classification of multi-level voltage intervals and formulation of different control strategies. It is impossible to flexibly adjust between partitions according to the real-time status of the grid voltage and the characteristics of the equipment, and it is impossible to adapt to the rapid changes in the grid structure and operating status. When the voltage fluctuates, the adjustment process may not be fast and accurate enough, thereby affecting the stability of the grid. Summary of the invention

[0005] The embodiments of the present invention provide a voltage active support control method, device, terminal equipment and storage medium for a new energy station, which can flexibly adjust the control strategy between partitions according to the different voltage threshold intervals in which the voltage is located, and can effectively solve the problem of lack of analysis and judgment of different voltage intervals in the prior art, thereby affecting the stability of the power grid.

[0006] An embodiment of the present invention provides a voltage active support control method for a new energy station, comprising:

[0007] Obtain the voltage corresponding to the distribution network at the new energy station;

[0008] Comparing the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval, respectively; wherein the maximum value of the first voltage threshold interval is less than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is less than the minimum value of the third voltage threshold interval;

[0009] When it is determined that the voltage is within the first voltage threshold interval, increasing the power output of the power generation equipment, the output of reactive power, and the discharge power of the energy storage equipment in the new energy station;

[0010] When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range;

[0011] When it is determined that the voltage is within the third voltage threshold range, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range.

[0012] Preferably, the new energy station includes: power generation equipment, reactive power compensation device and energy storage equipment; the power generation equipment includes: wind turbines and photovoltaic units;

[0013] The method of increasing the power output of power generation equipment, the output of reactive power, and the discharge power of energy storage equipment in the new energy station includes:

[0014] Sending a first control instruction for increasing the power output of the equipment to the wind turbine group and the photovoltaic group, so that the wind turbine group and the photovoltaic group adjust the output power of the group respectively according to the first control instruction;

[0015] Sending a second control instruction for increasing reactive power output to the reactive power compensation device, so that the reactive power compensation device increases the output of reactive power according to the second control instruction;

[0016] A third control instruction for increasing the discharge power output is sent to the energy storage device, so that the energy storage device increases the discharge rate and transmits electric energy to the distribution network.

[0017] Preferably, maintaining the power of the power generating equipment within a corresponding power range includes:

[0018] Obtaining a current first power of the wind turbine generator set and a current second power of the photovoltaic generator set;

[0019] Subtracting the first power from the maximum value of the first power range corresponding to the wind turbine generator set to obtain a first power difference value of the wind turbine generator set; wherein the first power difference value is used to characterize the amount of power that needs to be adjusted by the wind turbine generator set;

[0020] generating a fourth control instruction according to the first power difference, and then sending the fourth control instruction to the wind turbine generator set, so that the wind turbine generator set adjusts the power of the set according to the fourth control instruction;

[0021] Subtracting the second power from the maximum value of the second power range corresponding to the photovoltaic group to obtain a second power difference of the photovoltaic group; wherein the second power difference is used to represent the amount of power that needs to be adjusted by the photovoltaic group;

[0022] A fifth control instruction is generated according to the second power difference, and then the fifth control instruction is sent to the photovoltaic group, so that the photovoltaic group adjusts the power of the group according to the fifth control instruction.

[0023] Preferably, adjusting the discharge power of the energy storage device to a corresponding discharge power range includes:

[0024] Obtain the current discharge power of the energy storage device;

[0025] generating a sixth control instruction according to a difference between the current discharge power and a preset discharge power range;

[0026] The sixth control instruction is sent to the energy storage device, so that the energy storage device adjusts the discharge power of the energy storage device according to the sixth control instruction until the discharge power of the energy storage device is within the discharge power range corresponding to the energy storage device.

[0027] Preferably, the new energy station further comprises: a load device for consuming electric energy;

[0028] The fine-tuning operation of each device in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range includes:

[0029] controlling the output power of the power generation equipment according to a seventh control instruction for reducing the output power of the power generation equipment;

[0030] controlling the operating load of the load device according to an eighth control instruction for increasing the operating load of the load device;

[0031] According to a ninth control instruction for controlling the energy storage device to store electric energy, the energy storage device is controlled to charge so that the energy storage device stores the electric energy in the power distribution network.

[0032] Preferably, after fine-tuning each device in the new energy station, the method further includes:

[0033] Obtaining the target voltage after fine-tuning operation;

[0034] Determining whether a difference between the target voltage and a preset voltage threshold is greater than a preset difference amount;

[0035] If so, the evaluation index values ​​corresponding to each device under different power setting value combinations for measuring the degree of collaborative work are calculated, and the power setting value in the power setting value combination corresponding to the highest evaluation index value is used as the target power setting value, and then the power of each device is controlled according to each target power setting value until the difference between the voltage corresponding to the new energy station and the preset voltage threshold is not greater than the preset difference amount;

[0036] If not, the control process of active voltage support is terminated.

[0037] Preferably, the step of calculating the evaluation index values ​​for measuring the degree of collaborative work corresponding to the various devices under different power setting value combinations, and taking the power setting value in the power setting value combination corresponding to the highest evaluation index value as the target power setting value, includes:

[0038] Acquire an initial power setting value combination; wherein the initial power setting value combination includes a plurality of power setting values;

[0039] The initial power setting value combination is used as the current power setting value combination, and the following target power setting value determination operation is repeatedly performed until the current number of iterations is equal to the preset number of iterations threshold, and the target power setting value in the power setting value combination corresponding to the highest evaluation index value is output:

[0040] Get the current iteration number;

[0041] When it is determined that the current number of iterations is less than a preset number of iterations threshold, a current gradient vector is calculated according to each power setting value in the current power setting value combination; wherein the gradient vector is used to indicate the direction in which the function value increases fastest;

[0042] According to a preset learning rate, a current gradient vector and a current power setting value combination, updating each power setting value in the power setting value combination to generate an updated power setting value combination;

[0043] Calculate the evaluation index value corresponding to each device under the updated power setting value combination for measuring the degree of collaborative work;

[0044] The current number of iterations is added to the preset increment to obtain the updated number of iterations, and the updated number of iterations is used as the current number of iterations for the next target power setting value, and the updated power setting value combination is used as the current power setting value combination for the next target power setting value determination operation.

[0045] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0046] An embodiment of the present invention provides a voltage active support control device for a new energy station, comprising: a voltage acquisition module, an interval comparison module and an active support control module;

[0047] The voltage acquisition module is used to obtain the voltage corresponding to the distribution network at the new energy station;

[0048] The interval comparison module is used to compare the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval respectively; wherein the maximum value of the first voltage threshold interval is smaller than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is smaller than the minimum value of the third voltage threshold interval;

[0049] The active support control module is used to increase the power output of the power generation equipment, the output of reactive power and the discharge power of the energy storage equipment in the new energy station when it is determined that the voltage is within the first voltage threshold range;

[0050] When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range;

[0051] When it is determined that the voltage is within the third voltage threshold range, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range.

[0052] Based on the above method embodiments, the present invention provides corresponding terminal equipment embodiments.

[0053] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the voltage active support control method for a new energy station described in the above-mentioned embodiment of the invention.

[0054] Based on the above method embodiments, the present invention provides corresponding storage medium item embodiments.

[0055] Another embodiment of the present invention provides a storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the voltage active support control method for a new energy station described in the above-mentioned embodiment of the invention.

[0056] The following beneficial effects are achieved by implementing the present invention:

[0057] The embodiment of the present invention provides a voltage active support control method, device, terminal equipment and storage medium for a new energy station. The present invention introduces a multi-level voltage threshold interval, such as a first voltage threshold interval, a second voltage threshold interval and a third voltage threshold interval, and each interval has its own specific control strategy. Specifically, in different voltage intervals, the present invention adopts different control strategies: when the voltage is within the first voltage threshold interval, it means that the voltage is low, then the power grid voltage can be quickly increased by increasing the power output, reactive power output and discharge power of the power generation equipment and the energy storage equipment, and the stability of the power grid can be ensured; when the voltage is within the second voltage threshold interval, it means that the voltage at this time is within a moderate range, then the power of the power generation equipment can be kept within the corresponding power range, and the discharge power of the energy storage equipment can be adjusted to the corresponding discharge power range to maintain voltage stability, while avoiding waste of resources caused by excessive adjustment. When the voltage is within the third voltage threshold interval, it means that the voltage at this time is too high, then a fine adjustment operation can be implemented, that is, the state of each device can be gradually adjusted until the current voltage corresponding to the new energy station is restored to the second voltage threshold interval, so that the voltage is reduced to a safe range in a safe and stable manner to avoid damage to the equipment. Compared with the prior art, the present invention can monitor the grid voltage in real time, and flexibly adjust the control strategy between partitions according to the different voltage threshold intervals in which the voltage is located. The multi-level division of the intervals enables the control strategy to more accurately match the actual state of the grid voltage, which can further make the control process faster and more accurate when the voltage fluctuates, help to cope with the rapid changes in the grid structure and operating status, and improve the stability and reliability of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a flow chart of a voltage active support control method for a new energy station provided in one embodiment of the present invention.

[0059] Figure 2 A schematic structural diagram of a voltage active support control device for a new energy station provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0061] like Figure 1FIG. 1 is a flow chart of a voltage active support control method for a new energy station provided by an embodiment of the present invention. The voltage active support control method for new energy equipment includes:

[0062] Step S1: Obtain the voltage corresponding to the distribution network at the new energy station;

[0063] Step S2: comparing the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval respectively; wherein the maximum value of the first voltage threshold interval is less than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is less than the minimum value of the third voltage threshold interval;

[0064] Step S3: when it is determined that the voltage is within the first voltage threshold range, increasing the power output of the power generation equipment, the output of reactive power and the discharge power of the energy storage equipment in the new energy station;

[0065] When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range;

[0066] When it is determined that the voltage is within the third voltage threshold range, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range.

[0067] For step S1, in a preferred embodiment, in order to adopt different control strategies when the voltage corresponding to the new energy is in different voltage threshold intervals, the present invention can predetermine different voltage threshold intervals and determine that different voltage intervals correspond to different control modes.

[0068] Specifically, we first collect data to analyze the transient response and voltage stability requirements of various types of equipment in new energy stations, and analyze the timing and amplitude characteristics of the voltage during the fault process, so that we can formulate a reactive power support strategy that adapts to the characteristics of the equipment.

[0069] It is indicative, and the collected data may be the type, scale, service life and fault history data of the equipment. The fault history data includes the type of equipment fault, the time when the fault occurred, and the scope of the fault. The types of equipment include wind turbines, photovoltaic units, energy storage units and reactive compensation devices, and reactive compensation devices include SVG / SVC and capacitors.

[0070] Through the data of the above-mentioned types of equipment, the timing and amplitude characteristics of the voltage and reactive power waveforms during the fault process can be analyzed. According to the transient model of the equipment, the voltage and reactive power response characteristics of the equipment when the fault occurs can be determined, thereby determining the corresponding control strategy under different voltage ranges.

[0071] In an embodiment of the present invention, the voltage can be divided into three intervals, such as a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval, and the maximum value of the first voltage threshold interval is less than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is less than the minimum value of the third voltage threshold interval. Then: the first voltage threshold interval < the second voltage threshold interval < the third voltage threshold interval.

[0072] In the active voltage support control strategy of the embodiment of the present invention, the voltage of the power grid can be divided into a low voltage interval, a medium voltage interval and a high voltage interval, and corresponding control strategies can be formulated for different intervals.

[0073] The low voltage interval (first voltage threshold interval) is characterized by the grid voltage being lower than normal, and there is a risk of power shortage. The control strategy is to quickly increase the grid voltage to ensure the continuity and stability of power supply.

[0074] The medium voltage interval (i.e., the second voltage threshold interval) is characterized by the grid voltage being within the normal range, but may require fine-tuning to maintain optimal operating conditions. The control strategy is to maintain the stability and efficiency of the grid through coordinated operation and fine adjustment of equipment.

[0075] The high voltage interval (i.e. the third voltage threshold interval) is characterized by high grid voltage, which needs to be quickly reduced to a safe range. The control strategy is: optimize the working mode of the equipment to prevent the equipment from entering an inefficient or protective state due to excessive voltage, and perform fine-tuning operations on each device in the new energy station until the voltage corresponding to the new energy station returns to the normal range.

[0076] The classification and control strategy of the multi-level voltage intervals of the present invention enables the power grid to cope with various voltage fluctuations more flexibly and reduce the impact of voltage fluctuations on the stability of the power grid.

[0077] For step S2, in a preferred embodiment, the voltage corresponding to the distribution network at the new energy station is set to V, and the voltage is compared with the first voltage threshold interval, the second voltage threshold interval, and the third voltage threshold interval, respectively, specifically:

[0078] When V1≤V<V2, it belongs to the first voltage threshold interval; when V2≤V<V3, it belongs to the second voltage threshold interval; when V3≤V<V4, it belongs to the third voltage threshold interval.

[0079] By dividing the voltage into finer intervals, a more refined control strategy can be achieved. Different control measures can be formulated for each interval according to its specific voltage range and stability requirements, thereby improving the accuracy and effectiveness of control.

[0080] For step S3, in a preferred embodiment, according to the comparison results of the voltage with the first voltage threshold interval, the second voltage threshold interval, and the third voltage threshold interval, if it is determined that the voltage is within the first voltage threshold interval, the power output of the power generation equipment in the new energy station, the output of reactive power, and the discharge power of the energy storage equipment are increased;

[0081] If it is determined that the voltage is within the second voltage threshold interval, the power of the power generation device is maintained within the corresponding power range, and the discharge power of the energy storage device is adjusted to the corresponding discharge power range;

[0082] If it is determined that the voltage is within the third voltage threshold range, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range.

[0083] Specifically, the new energy station includes: power generation equipment, reactive power compensation equipment and energy storage equipment; and the power generation equipment includes: wind turbines and photovoltaic units;

[0084] When V1≤V<V2, which belongs to the first voltage threshold interval, then:

[0085] Sending a first control instruction for increasing the power output of the equipment to the wind turbine group and the photovoltaic group, so that the wind turbine group and the photovoltaic group adjust the output power of the group respectively according to the first control instruction;

[0086] Sending a second control instruction for increasing reactive power output to the reactive power compensation device, so that the reactive power compensation device increases the output of reactive power according to the second control instruction;

[0087] A third control instruction for increasing the discharge power output is sent to the energy storage device, so that the energy storage device increases the discharge rate and transmits electric energy to the distribution network.

[0088] Specifically, it is first monitored that the voltage V is in a first voltage threshold interval, ie, V1≤V<V2, and then a first control instruction is generated according to the voltage state, the instruction is intended to increase the power output of the wind turbine and the photovoltaic unit.

[0089] The first control instruction is sent to the wind turbine and the photovoltaic unit, so that after receiving the instruction, the wind turbine and the photovoltaic unit adjust their operating states to increase the output power. For the wind turbine, the blade angle can be adjusted, the speed can be increased, and other operations can be performed according to the first control instruction; for the photovoltaic unit, the inverter control strategy can be optimized according to the first control instruction to increase the power output.

[0090] Also based on the monitoring results of the voltage V, the embodiment of the present invention can generate a second control instruction to enable the reactive compensation device to increase the output of reactive power, and send the second control instruction to the reactive compensation device so that after receiving the instruction, the reactive compensation device adjusts its working mode to increase the output of reactive power, thereby improving the power factor of the power grid and improving the voltage stability of the power grid.

[0091] Therefore, when V1≤V<V2, it is a low voltage interval, and there is a power shortage. At this time, some reactive power support needs to be provided to increase the grid voltage. The operation mode of the equipment should be inclined to a higher voltage output to prevent the grid voltage from further decreasing, which can increase the power output of the power generation equipment to cope with the situation of insufficient grid voltage. At the same time, the output of reactive power is also increased to ensure that the voltage is supported. The discharge power of the energy storage device is increased to provide additional power support to the grid. At the same time, the reactive output of the energy storage device will also be adjusted according to demand to increase reactive support.

[0092] When V2≤V<V3, which belongs to the second voltage threshold interval, then:

[0093] Obtaining a current first power of the wind turbine generator set and a current second power of the photovoltaic generator set;

[0094] Subtracting the first power from the maximum value of the first power range corresponding to the wind turbine generator set to obtain a first power difference value of the wind turbine generator set; wherein the first power difference value is used to characterize the amount of power that needs to be adjusted by the wind turbine generator set;

[0095] generating a fourth control instruction according to the first power difference, and then sending the fourth control instruction to the wind turbine generator set, so that the wind turbine generator set adjusts the power of the set according to the fourth control instruction;

[0096] Subtracting the second power from the maximum value of the second power range corresponding to the photovoltaic group to obtain a second power difference of the photovoltaic group; wherein the second power difference is used to represent the amount of power that needs to be adjusted by the photovoltaic group;

[0097] A fifth control instruction is generated according to the second power difference, and then the fifth control instruction is sent to the photovoltaic group, so that the photovoltaic group adjusts the power of the group according to the fifth control instruction.

[0098] Furthermore, the current discharge power of the energy storage device is also obtained;

[0099] generating a sixth control instruction according to a difference between the current discharge power and a preset discharge power range;

[0100] The sixth control instruction is sent to the energy storage device, so that the energy storage device adjusts the discharge power of the energy storage device according to the sixth control instruction until the discharge power of the energy storage device is within the discharge power range corresponding to the energy storage device.

[0101] Specifically, first, for the wind turbine, its current power (first power) is compared with the maximum value of the first power range corresponding to the wind turbine, and a first power difference is calculated. This difference represents the amount of power that needs to be adjusted for the wind turbine, that is, the power that needs to be adjusted in order to achieve the maximum power output or to stay within the allowable range. For the photovoltaic unit, a similar operation is performed to calculate the second power difference, which represents the amount of power that needs to be adjusted for the photovoltaic unit.

[0102] According to the first power difference, a fourth control instruction may be generated, which instructs the wind turbine generator system how to adjust its power output, such as reducing or maintaining the current power, which may depend on the direction and size of the difference.

[0103] A fifth control instruction is generated according to the second power difference, wherein the fifth control instruction instructs the photovoltaic group how to adjust its power output.

[0104] Thus, the fourth control instruction can be sent to the wind turbine generator set, and the wind turbine generator set adjusts its power output according to the instruction. And the fifth control instruction can be sent to the photovoltaic generator set, and the photovoltaic generator set also adjusts its power output according to the instruction.

[0105] Furthermore, for the energy storage device, its current discharge power can be compared with the preset discharge power range, and the difference between the two can be calculated, so as to generate a sixth control instruction according to the difference, which instructs the energy storage device how to adjust its discharge power (increase or decrease the discharge rate). The sixth control instruction is sent to the energy storage device, and the energy storage device adjusts its discharge power according to the instruction until its discharge power is within the preset discharge power range.

[0106] Therefore, in the entire control process of the second voltage threshold interval, the embodiment of the present invention monitors the voltage V in real time, and calculates the amount of power that each of the wind turbine, photovoltaic unit and energy storage device needs to adjust according to the current state. Then, the corresponding control instructions are generated and sent to the corresponding devices. After receiving the instructions, these devices adjust their power output according to the instructions, so as to work together to maintain the stability and voltage level of the power grid, and the above control strategy can ensure that the power grid can respond quickly and accurately when facing different voltage conditions.

[0107] When V3≤V<V4, which belongs to the second voltage threshold interval, then:

[0108] In a preferred embodiment, the new energy station further includes: a load device for consuming electric energy;

[0109] Then the fine adjustment operation is performed on each device in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range, specifically:

[0110] controlling the output power of the power generation equipment according to a seventh control instruction for reducing the output power of the power generation equipment;

[0111] controlling the operating load of the load device according to an eighth control instruction for increasing the operating load of the load device;

[0112] According to a ninth control instruction for controlling the energy storage device to store electric energy, the energy storage device is controlled to charge so that the energy storage device stores the electric energy in the power distribution network.

[0113] In the case of V3≤V<V4, the embodiment of the present invention coordinates the power supply and demand relationship in the new energy station by simultaneously executing the above three control steps, namely reducing the output power of the power generation equipment, increasing the operating load of the load equipment, and controlling the charging of the energy storage equipment. These measures work together to stably restore the grid voltage to a suitable level within the second voltage threshold interval.

[0114] In addition, the present invention will continue to monitor changes in grid voltage and dynamically adjust the sending and execution of control instructions as needed to ensure stable operation of the grid and precise control of voltage.

[0115] The present invention can monitor the grid voltage in real time, and flexibly adjust the control strategy between partitions according to the different voltage threshold intervals in which the voltage is located. The multi-level division of the intervals can enable the control strategy to more accurately match the actual state of the grid voltage, cope with the rapid changes in the grid structure and operating state, and improve the stability and reliability of the grid.

[0116] In a preferred embodiment, after fine-tuning each device in the new energy station, the method further includes:

[0117] Obtaining the target voltage after fine-tuning operation;

[0118] Determining whether a difference between the target voltage and a preset voltage threshold is greater than a preset difference amount;

[0119] If so, the evaluation index values ​​corresponding to each device under different power setting value combinations for measuring the degree of collaborative work are calculated, and the power setting value in the power setting value combination corresponding to the highest evaluation index value is used as the target power setting value, and then the power of each device is controlled according to each target power setting value until the difference between the voltage corresponding to the new energy station and the preset voltage threshold is not greater than the preset difference amount;

[0120] If not, the control process of active voltage support is terminated.

[0121] It can be understood that in order to achieve collaborative optimization among multiple devices and make the equipment of the entire new energy station reach a global optimal state, the present invention continuously changes the power setting value in the power setting value combination so that the overall system evaluation index reaches the maximum and the power setting value in the global optimal state is obtained.

[0122] In schematic form, by simulating or predicting the operation of each device under different power setting value combinations, the evaluation index value corresponding to each combination is calculated. In a preferred embodiment, the evaluation index value used to measure the degree of collaborative work can be a weighted comprehensive value of multiple factors such as system voltage stability, power output efficiency, and smoothness of collaborative work between devices.

[0123] The combination with the highest evaluation index value is selected from all power setting value combinations, and the power setting value in the combination is used as the target power setting value of each device. Then, according to the determined target power setting value, the control system can send instructions to each device to adjust its output power until the difference between the voltage output by the new energy station and the preset voltage threshold is no greater than the preset difference amount.

[0124] If the difference is not greater than the preset difference, the control process of active voltage support can be ended directly, because the voltage of the new energy station is already stable and within the required range, and no further adjustment is required. By calculating the evaluation indicators under different combinations, the power setting that makes the most effective use of resources (such as wind power, solar energy, energy storage capacity, etc.) can be identified, thereby maximizing energy output, reducing waste, and improving economic benefits.

[0125] In a preferred embodiment, the embodiment of the present invention can find a set of power setting value combinations through the gradient ascent method so that the evaluation index reaches the maximum, specifically:

[0126] When calculating the evaluation index values ​​corresponding to different power setting value combinations of each device for measuring the degree of collaborative work, and taking the power setting value in the power setting value combination corresponding to the highest evaluation index value as the target power setting value, specifically including:

[0127] Acquire an initial power setting value combination; wherein the initial power setting value combination includes a plurality of power setting values;

[0128] The initial power setting value combination is used as the current power setting value combination, and the following target power setting value determination operation is repeatedly performed until the current number of iterations is equal to the preset number of iterations threshold, and the target power setting value in the power setting value combination corresponding to the highest evaluation index value is output:

[0129] Get the current iteration number;

[0130] When it is determined that the current number of iterations is less than a preset number of iterations threshold, a current gradient vector is calculated according to each power setting value in the current power setting value combination; wherein the gradient vector is used to indicate the direction in which the function value increases fastest;

[0131] According to a preset learning rate, a current gradient vector and a current power setting value combination, updating each power setting value in the power setting value combination to generate an updated power setting value combination;

[0132] Calculate the evaluation index value corresponding to each device under the updated power setting value combination for measuring the degree of collaborative work;

[0133] The current number of iterations is added to the preset increment to obtain the updated number of iterations, and the updated number of iterations is used as the current number of iterations for the next target power setting value, and the updated power setting value combination is used as the current power setting value combination for the next target power setting value determination operation.

[0134] In this preferred embodiment, the present invention optimizes a set of power setting values ​​by using a gradient ascent method, with the purpose of maximizing the evaluation index used to measure the degree of cooperation between devices.

[0135] In each iteration, the gradient vector under the current power setting value combination is first calculated, and the gradient vector points to the direction in which the function value (i.e., the evaluation index value) increases fastest, so that the variables can be adjusted and the optimal solution can be quickly approached, so that the algorithm moves in the direction of maximizing the evaluation index, that is, finding a power setting value combination close to the optimal one within a limited number of iterations, thereby improving the efficiency of the solution.

[0136] Furthermore, the preset learning rate, the current gradient vector and the current power setting value combination can be used to update each power setting value in the power setting value combination. The learning rate is a hyperparameter used to control the step size of the power setting value update in each iteration, so as to recalculate the evaluation index value according to the updated power setting value combination, and increase the current iteration number by a preset increment (usually 1) as the current iteration number of the next iteration.

[0137] When the number of iterations reaches the preset iteration threshold, the algorithm stops iterating. At this time, the power setting value in the power setting value combination corresponding to the highest evaluation index value is the target power setting value. Applying this set of target power setting values ​​to the corresponding devices can optimize the collaborative working effect between devices.

[0138] The present invention can automatically find a set of optimal power setting values ​​so that the collaborative working effect between devices is optimal.

[0139] In a preferred embodiment, a set of independent variables of the equipment can be found by the gradient ascent method so that the evaluation index F(x, y) reaches the maximum, and the gradient of the evaluation index is calculated. Then we have:

[0140]

[0141] Among them, X and Y are the state variables of devices A and B respectively, α is the learning rate, and the partial derivative Represents the rate of change of the function F(x, y) in the x direction, partial derivative It represents the rate of change of the function F(x, y) in the y direction;

[0142] The independent variable of the device changes according to the fine adjustment of the device, until the evaluation index F(x, y) reaches a fixed value and remains stable without changing or reaches a preset number of iterations, then the fine adjustment of the device can be completed.

[0143] The present invention can use the gradient ascent method to set evaluation indicators and measure the effect of collaborative work; determine the setting variables of the equipment status in real time, and find a set of independent variables of the equipment (such as the blade angle of the wind turbine, the orientation and tilt angle of the solar panel, etc.) through the gradient ascent method so that the evaluation indicator F (x, y) reaches the maximum.

[0144] Step 1: Initialize the values ​​of x and y, usually chosen randomly.

[0145] Step 2: Calculate the gradient of the evaluation index F(x, y) Among them, the gradient (x, y) is a vector that points in the direction where the function grows fastest;

[0146] Step 3: Update the values ​​of x and y:

[0147]

[0148] Repeat steps 2 and 3 until the evaluation index F(x, y) reaches a maximum, or reaches a preset number of iterations, thereby completing the fine-tuning of the device.

[0149] In real-time systems, the state of the equipment may need to be adjusted frequently to cope with changes in the external environment, and the gradient ascent method can calculate the gradient and update the independent variable in real time, thereby ensuring that the equipment always maintains the optimal or near-optimal working state. The power generation efficiency of new energy stations (such as wind farms and solar power stations) is affected by a variety of environmental factors, such as wind speed, light intensity, temperature, etc. By adjusting the equipment status in real time (such as the blade angle of the wind turbine, the orientation and tilt angle of the solar panel, etc.), and optimizing through the gradient ascent method, the station can maintain the best power generation efficiency under different environmental conditions, thereby improving the overall energy utilization efficiency.

[0150] Moreover, in real-time systems, changes in the external environment may cause fluctuations in the output power of renewable energy stations. By optimizing the equipment status in real time through the gradient ascent method, such fluctuations can be reduced, making the output power of the station more stable, which is conducive to the stable operation of the power grid and the improvement of power quality.

[0151] like Figure 2 As shown, based on the embodiments of the voltage active support control method of various new energy equipments mentioned above, the present invention provides corresponding device embodiments;

[0152] An embodiment of the present invention provides a voltage active support control device for a new energy station, comprising: a voltage acquisition module, an interval comparison module and an active support control module;

[0153] The voltage acquisition module is used to obtain the voltage corresponding to the distribution network at the new energy station;

[0154] The interval comparison module is used to compare the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval respectively; wherein the maximum value of the first voltage threshold interval is smaller than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is smaller than the minimum value of the third voltage threshold interval;

[0155] The active support control module is used to increase the power output of the power generation equipment, the output of reactive power and the discharge power of the energy storage equipment in the new energy station when it is determined that the voltage is within the first voltage threshold range;

[0156] When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range;

[0157] When it is determined that the voltage is within the third voltage threshold range, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range.

[0158] It should be noted that the device embodiments described above are merely schematic, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, and may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without paying creative labor.

[0159] Those skilled in the art can clearly understand that, for the sake of convenience and simplicity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0160] Based on the above-mentioned embodiments of the voltage active support control method for various new energy equipment, the present invention provides corresponding embodiments of terminal equipment items.

[0161] An embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a voltage active support control method for a new energy station as described in any method embodiment of the present invention.

[0162] The terminal device may be a computing terminal device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0163] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0164] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device or other volatile solid-state storage device.

[0165] Based on the above-mentioned embodiments of the voltage active support control method for various new energy devices, the present invention provides corresponding storage medium item embodiments.

[0166] An embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a voltage active support control method for a new energy station as described in any method embodiment of the present invention.

[0167] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of each method embodiment described above can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0168] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A voltage active support control method for a new energy station, characterized in that: include: Obtain the voltage corresponding to the distribution network at the new energy station; Comparing the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval, respectively; wherein the maximum value of the first voltage threshold interval is less than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is less than the minimum value of the third voltage threshold interval; When it is determined that the voltage is within the first voltage threshold interval, increasing the power output of the power generation equipment, the output of reactive power, and the discharge power of the energy storage equipment in the new energy station; When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range; When it is determined that the voltage is within the third voltage threshold interval, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold interval.

2. A voltage active support control method for a new energy station as claimed in claim 1, characterized in that: The new energy station includes: power generation equipment, reactive power compensation equipment and energy storage equipment; the power generation equipment includes: wind turbines and photovoltaic units; The method of increasing the power output of power generation equipment, the output of reactive power, and the discharge power of energy storage equipment in the new energy station includes: Sending a first control instruction for increasing the power output of the equipment to the wind turbine group and the photovoltaic group, so that the wind turbine group and the photovoltaic group adjust the output power of the group respectively according to the first control instruction; Sending a second control instruction for increasing reactive power output to the reactive power compensation device, so that the reactive power compensation device increases the output of reactive power according to the second control instruction; A third control instruction for increasing the discharge power output is sent to the energy storage device, so that the energy storage device increases the discharge rate and transmits electric energy to the distribution network.

3. A voltage active support control method for a new energy station as claimed in claim 2, characterized in that: The maintaining the power of the power generating equipment within the corresponding power range includes: Obtaining a current first power of the wind turbine generator set and a current second power of the photovoltaic generator set; Subtracting the first power from the maximum value of the first power range corresponding to the wind turbine generator set to obtain a first power difference value of the wind turbine generator set; wherein the first power difference value is used to characterize the amount of power that needs to be adjusted by the wind turbine generator set; generating a fourth control instruction according to the first power difference, and then sending the fourth control instruction to the wind turbine generator set, so that the wind turbine generator set adjusts the power of the set according to the fourth control instruction; Subtracting the second power from the maximum value of the second power range corresponding to the photovoltaic group to obtain a second power difference of the photovoltaic group; wherein the second power difference is used to represent the amount of power that needs to be adjusted by the photovoltaic group; A fifth control instruction is generated according to the second power difference, and then the fifth control instruction is sent to the photovoltaic group, so that the photovoltaic group adjusts the power of the group according to the fifth control instruction.

4. A voltage active support control method for a new energy station as claimed in claim 3, characterized in that: The step of adjusting the discharge power of the energy storage device to a corresponding discharge power range includes: Obtain the current discharge power of the energy storage device; generating a sixth control instruction according to a difference between the current discharge power and a preset discharge power range; The sixth control instruction is sent to the energy storage device, so that the energy storage device adjusts the discharge power of the energy storage device according to the sixth control instruction until the discharge power of the energy storage device is within the discharge power range corresponding to the energy storage device.

5. The voltage active support control method of a new energy station according to claim 4, characterized in that: The new energy station also includes: load equipment for consuming electric energy; The fine-tuning operation of each device in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold range includes: controlling the output power of the power generation equipment according to a seventh control instruction for reducing the output power of the power generation equipment; controlling the operating load of the load device according to an eighth control instruction for increasing the operating load of the load device; According to a ninth control instruction for controlling the energy storage device to store electric energy, the energy storage device is controlled to charge so that the energy storage device stores the electric energy in the power distribution network.

6. A voltage active support control method for a new energy station as claimed in claim 5, characterized in that: After fine-tuning each device in the new energy station, it also includes: Obtaining the target voltage after fine-tuning operation; Determining whether a difference between the target voltage and a preset voltage threshold is greater than a preset difference amount; If so, the evaluation index values ​​corresponding to each device under different power setting value combinations for measuring the degree of collaborative work are calculated, and the power setting value in the power setting value combination corresponding to the highest evaluation index value is used as the target power setting value, and then the power of each device is controlled according to each target power setting value until the difference between the voltage corresponding to the new energy station and the preset voltage threshold is not greater than the preset difference amount; If not, the control process of active voltage support is terminated.

7. A voltage active support control method for a new energy station as claimed in claim 6, characterized in that: The step of calculating the evaluation index values ​​corresponding to different power setting value combinations of each device for measuring the degree of collaborative work, and taking the power setting value in the power setting value combination corresponding to the highest evaluation index value as the target power setting value, includes: Acquire an initial power setting value combination; wherein the initial power setting value combination includes a plurality of power setting values; The initial power setting value combination is used as the current power setting value combination, and the following target power setting value determination operation is repeatedly performed until the current number of iterations is equal to the preset number of iterations threshold, and the target power setting value in the power setting value combination corresponding to the highest evaluation index value is output: Get the current iteration number; When it is determined that the current number of iterations is less than a preset number of iterations threshold, a current gradient vector is calculated according to each power setting value in the current power setting value combination; wherein the gradient vector is used to indicate the direction in which the function value increases fastest; According to a preset learning rate, a current gradient vector and a current power setting value combination, updating each power setting value in the power setting value combination to generate an updated power setting value combination; Calculate the evaluation index value corresponding to each device under the updated power setting value combination for measuring the degree of collaborative work; The current number of iterations is added to the preset increment to obtain the updated number of iterations, and the updated number of iterations is used as the current number of iterations for the next target power setting value, and the updated power setting value combination is used as the current power setting value combination for the next target power setting value determination operation.

8. A voltage active support control device for a new energy station, characterized in that: include: Voltage acquisition module, interval comparison module and active support control module; The voltage acquisition module is used to obtain the voltage corresponding to the distribution network at the new energy station; The interval comparison module is used to compare the voltage with a first voltage threshold interval, a second voltage threshold interval, and a third voltage threshold interval respectively; wherein the maximum value of the first voltage threshold interval is smaller than the minimum value of the second voltage threshold interval, and the maximum value of the second voltage threshold interval is smaller than the minimum value of the third voltage threshold interval; The active support control module is used to increase the power output of the power generation equipment, the output of reactive power and the discharge power of the energy storage equipment in the new energy station when it is determined that the voltage is within the first voltage threshold range; When it is determined that the voltage is within the second voltage threshold interval, maintaining the power of the power generation device within the corresponding power range, and adjusting the discharge power of the energy storage device to the corresponding discharge power range; When it is determined that the voltage is within the third voltage threshold interval, fine-tuning operations are performed on various devices in the new energy station until the current voltage corresponding to the new energy station is restored to within the second voltage threshold interval.

9. A terminal device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements a voltage active support control method for a new energy station as described in any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein, when the computer program is running, the device where the storage medium is located is controlled to execute the voltage active support control method for a new energy station as described in any one of claims 1 to 7.

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