Zone area autonomous method, system and device based on new energy cooperative regulation and control and medium

Abstract

The invention relates to the technical field of power distribution court autonomy, and discloses a court autonomy method, system, equipment and medium based on new energy coordinated regulation, comprising the steps of: acquiring equipment operation parameters and court load parameters of new energy equipment in a power distribution court in real time, and according to the equipment operation parameters and the court load parameters, calculating the power distribution court autonomy according to the equipment operation parameters and the court load parameters; and regulating and controlling the photovoltaic inverter, the energy storage equipment and the charging pile in the power distribution area by adopting a preset regulation and control strategy, wherein the regulation and control strategy comprises a first regulation and control strategy and a second regulation and control strategy. The running states of the photovoltaic equipment, the energy storage equipment and the charging piles in the transformer area are monitored in real time, the photovoltaic equipment, the energy storage equipment and the charging piles are cooperated to carry out transformer area autonomy in combination with the local control strategy of energy storage, the consumption pressure of distributed photovoltaic is effectively reduced, the optimal charging load regulation control of the transformer area is realized, and the power consumption of the transformer area is reduced. And safe and stable operation of the power distribution area is ensured.

Description

Technical Field

[0001] The present invention relates to the field of power distribution station area autonomy technology, and in particular to a power distribution station area autonomy method, system, equipment and medium based on new energy coordinated regulation. Background Art

[0002] With the rapid development of new energy technologies, a large number of distributed new energy sources have been injected into the distribution network, and the power supply and consumption interaction has formed at the end of the power grid, breaking the original balance of the power grid. For example, during peak hours, there are often a series of problems such as high load proportion, high low voltage proportion, low self-generation and self-consumption, poor source-load matching, many reverse transmission areas, uneven distribution, and even serious reverse transmission and voltage exceeding the limit in some places. The addition of new energy electric vehicles also puts higher requirements on the load bearing level of transformers, which is easy to cause a series of problems such as load imbalance and transformer forward heavy overload, which brings certain risks to the safe operation of the transformer area.

[0003] Therefore, in order to achieve flexible dispatch of all links of source, grid, storage and load, it is necessary to implement strategic management and flexible dispatch of photovoltaic grid-connected and off-grid, energy storage charging and discharging according to the overall operation of the power grid. At present, some research has been carried out on the coordinated optimization dispatch of source, grid, load and storage in the transmission network or medium and high voltage distribution network, mainly through the dispatching system for coordination and optimization. However, in the substation, each element of source, grid, load and storage is in an independent operation mode, and comprehensive coordinated optimization has not been achieved. Even the research on the coordinated operation of the substation area is mainly focused on the research of communication technology, and no detailed research has been carried out on the strategies of mutual assistance and orderly charging in the actual operation of the substation area. It can be seen that the existing power grid dispatching and control methods have problems with the coordinated control of "source, grid, load and storage" at the substation level and the difficulty of substation edge autonomy. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a substation autonomy method, system, device and medium based on coordinated regulation of new energy. Through the coordinated optimization control strategy of new energy equipment, the substation load rate is optimized and adjusted to reduce the absorption pressure of distributed photovoltaics and achieve the effect of optimal charging load regulation and control in the substation.

[0005] In a first aspect, the present invention provides a regional autonomy method based on coordinated regulation of new energy sources, the method comprising:

[0006] Real-time acquisition of equipment operating parameters and area load parameters of new energy equipment in the distribution area, the equipment operating parameters include photovoltaic inverter active power, charging pile output power, energy storage equipment battery charge state and energy storage equipment operation state, the area load parameters include area load rate and area reverse load rate;

[0007] According to the equipment operation parameters and the area load parameters, a preset control strategy is used to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area, wherein the control strategy includes a first control strategy and a second control strategy;

[0008] Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area;

[0009] When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

[0010] Furthermore, the step of obtaining the equipment operation parameters and the area load parameters of the new energy equipment in the distribution area in real time includes:

[0011] Calculate the active power of the photovoltaic inverter according to the voltage value, current value and operating status of the photovoltaic inverter in the distribution station area;

[0012] Calculate the output power of the charging pile according to the voltage value, current value and operating status of the charging pile in the distribution station area;

[0013] According to the grid voltage value, grid current value and grid rated power value in the distribution station area, the substation load rate and substation reverse load rate are calculated.

[0014] Furthermore, the step of collaboratively regulating the photovoltaic inverter and the energy storage device according to the reverse load rate of the station area includes:

[0015] Determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value, and if so, calculate the sum of the inverter powers according to the active powers of the photovoltaic inverters of each photovoltaic inverter, and calculate the active power ratio of each photovoltaic inverter according to the active power of the photovoltaic inverter and the sum of the inverter powers;

[0016] Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area;

[0017] The active power of each photovoltaic inverter is adjusted down according to the power regulation value, and it is re-determined whether the reverse load rate of the substation is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating status of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold, and the photovoltaic inverter is controlled to float down according to the preset power reduction ratio and rounds until the reverse load rate of the substation is less than the reverse load rate threshold.

[0018] Furthermore, the step of collaboratively regulating the photovoltaic inverter, the energy storage device and the charging pile according to the load rate of the station area includes:

[0019] Comparing the load rate of the station area with various load rate thresholds, the load rate thresholds including a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold;

[0020] If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold;

[0021] If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold;

[0022] If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

[0023] Furthermore, after the step of comparing the load rate of the station area with each load rate threshold, the method further includes:

[0024] According to the difference between the load rate of the substation and the compared load rate threshold, a PID control algorithm is used to calculate the load adjustment value of the substation, and according to the load adjustment value of the substation, the new energy equipment is regulated to achieve dynamic optimization and regulation of the load rate of the substation.

[0025] In a second aspect, the present invention provides a substation autonomous system based on coordinated regulation of new energy sources, the system comprising:

[0026] The data acquisition module is used to obtain the equipment operation parameters and area load parameters of the new energy equipment in the distribution area in real time. The equipment operation parameters include the active power of the photovoltaic inverter, the output power of the charging pile, the state of charge of the battery of the energy storage device, and the operation state of the energy storage device. The area load parameters include the area load rate and the area reverse load rate;

[0027] An equipment control module, used to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area according to the equipment operation parameters and the area load parameters using a preset control strategy, wherein the control strategy includes a first control strategy and a second control strategy;

[0028] Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area;

[0029] When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

[0030] Further, the device control module includes a first control module;

[0031] The first control module is used to determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value. If so, the sum of the inverter powers is calculated according to the active power of the photovoltaic inverters of each photovoltaic inverter, and the active power ratio of each photovoltaic inverter is calculated according to the active power of the photovoltaic inverter and the sum of the inverter power;

[0032] Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area;

[0033] According to the power adjustment value, the active power of each photovoltaic inverter is adjusted down, and it is re-determined whether the reverse load rate of the station area is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating state of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold;

[0034] According to the preset power reduction ratio and rounds, the photovoltaic inverter is controlled to float down until the reverse load rate of the station area is less than the reverse load rate threshold.

[0035] Further, the device control module includes a second control module;

[0036] The second control module is used to compare the load rate of the station area with various load rate thresholds, and the load rate thresholds include a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold;

[0037] If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold;

[0038] If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold;

[0039] If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

[0040] In a third aspect, an embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0041] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0042] The present invention provides a method, system, device and medium for substation autonomy based on coordinated regulation of new energy. The invention monitors the operating status of photovoltaic equipment, energy storage equipment and charging piles in the substation in real time, combines the local control strategy of energy storage, and coordinates photovoltaic equipment, energy storage equipment and charging piles to achieve substation autonomy, which can reduce the pressure of distributed photovoltaic absorption, realize the optimal charging load regulation and control of the substation, and ensure the safe and stable operation of the distribution substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of a method for regional autonomy based on coordinated regulation of new energy in an embodiment of the present invention;

[0044] Figure 2 It is a structural schematic diagram of a substation autonomous system based on coordinated regulation of new energy sources in an embodiment of the present invention;

[0045] Figure 3 It is a diagram of the internal structure of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0047] See also Figure 1 The first embodiment of the present invention proposes a method for area autonomy based on coordinated regulation of new energy sources, which includes steps S10 to S20:

[0048] Step S10, obtaining in real time the equipment operation parameters and the area load parameters of the new energy equipment in the distribution area, the equipment operation parameters include the active power of the photovoltaic inverter, the output power of the charging pile, the state of charge of the battery of the energy storage device and the operation state of the energy storage device, and the area load parameters include the area load rate and the area reverse load rate;

[0049] Step S20, according to the equipment operation parameters and the area load parameters, a preset control strategy is used to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area, and the control strategy includes a first control strategy and a second control strategy;

[0050] Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area;

[0051] When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

[0052] The present invention realizes the autonomy of the distribution area by coordinating and optimizing the new energy equipment in the distribution area. The new energy equipment here mainly includes photovoltaic equipment, energy storage equipment and charging piles. In this embodiment, the operating parameters of the new energy equipment and the load parameters of the distribution area are first obtained. The specific steps include:

[0053] Calculate the active power of the photovoltaic inverter according to the voltage value, current value and operating status of the photovoltaic inverter in the distribution station area;

[0054] Calculate the output power of the charging pile according to the voltage value, current value and operating status of the charging pile in the distribution station area;

[0055] According to the grid voltage value, grid current value and grid rated power value in the distribution station area, the substation load rate and substation reverse load rate are calculated.

[0056] In this embodiment, for photovoltaic equipment, the voltage, current, operating status and other parameters of the photovoltaic inverter are obtained, and then the active power of the photovoltaic inverter in operation is calculated in real time. The real-time calculation here can be calculated at the minute level. For charging piles, the voltage, current and operating status of the charging piles are obtained, and then the output power of the charging piles in the charging state is calculated in real time. For energy storage devices, the charging and discharging status of the energy storage equipment and the battery charge state SOC and other parameters can be obtained according to the management system of the energy storage equipment. For distribution stations, the load rate and reverse load rate of the station area are calculated by obtaining parameters such as the grid voltage, current and rated power value in the station area. The specific calculation steps can be performed using conventional calculation methods, which will not be explained in detail here. These parameters calculated in real time will provide data support for the execution of subsequent control strategies.

[0057] After obtaining the above-mentioned equipment operation parameters and area load parameters, the present invention provides two different control strategies to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area. The two control strategies are described below. Among them, the first control strategy is to coordinately control the photovoltaic inverter and the energy storage equipment according to the reverse load rate of the area, and its specific steps include:

[0058] Determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value, and if so, calculate the sum of the inverter powers according to the active powers of the photovoltaic inverters of each photovoltaic inverter, and calculate the active power ratio of each photovoltaic inverter according to the active power of the photovoltaic inverter and the sum of the inverter powers;

[0059] Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area;

[0060] The active power of each photovoltaic inverter is adjusted down according to the power regulation value, and it is re-determined whether the reverse load rate of the substation is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating status of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold, and the photovoltaic inverter is controlled to float down according to the preset power reduction ratio and rounds until the reverse load rate of the substation is less than the reverse load rate threshold.

[0061] In this embodiment, before explaining the control strategy, the configurable parameters of the substation autonomy of new energy collaboration are first explained. The configurable parameters include load rate threshold, reverse load rate threshold, absolute value of total active power output of new energy in the substation and adjustment start and end time, floating control and adjustment start and end time of total active power output of new energy in the substation, absolute value of total energy consumption of new energy in the substation and adjustment start and end time, floating control and adjustment start and end time of total energy consumption of new energy in the substation, and adjustment time. Among them, the load rate threshold is used to set heavy load parameters, such as the default substation load rate of 80% is the heavy load parameter; the reverse load rate threshold is used to set operation safety parameters, such as the default substation reverse load rate of -80% is the substation operation safety parameter; the substation new energy The absolute value of the total active power output is the fixed value of active power output allowed to be sent back by photovoltaic or energy storage. For example, if 100kW is allowed to be sent back, the value sent is -100kW; the floating control of the total active power output of new energy in the substation refers to the percentage of power reduction based on the current active output of the substation, such as a 10% reduction, that is, the value sent is 10%; the absolute value of the total energy consumption of new energy in the substation refers to the fixed value of active power that limits the total power consumption of charging piles or energy storage in the substation; the floating control of the total active power consumption of new energy in the substation refers to the percentage of power reduction based on the current total active energy consumption of the substation; the adjustment time refers to the time when regulation can be performed. For example, if the adjustment end time is all 0x99, it is always valid, and if it is 0x00, it stops immediately.

[0062] Based on the above parameters, the first control strategy is mainly used to ensure the safety of power grid operation. In this control strategy, the judgment condition for whether to execute the strategy is whether the operation of the current distribution station area is safe. According to the above parameters, the reverse load rate of the station area can be used as a characterization parameter for the safe operation of the station area. Therefore, in this embodiment, it is first determined whether the reverse load rate of the station area calculated in real time through the above steps is greater than the reverse load rate threshold. The reverse load rate threshold is the above configurable parameter. Since the reverse load rate is a negative number, for ease of comparison, the absolute value of the reverse load rate is used here to compare with the reverse load rate threshold. Assume The reverse load rate threshold is configured to be 80%. If the absolute value of the reverse load rate of the current substation is greater than the reverse load rate threshold, it means that there are hidden dangers in the operation safety of the substation. At this time, the first control strategy will be used for control. This control strategy is mainly for photovoltaic equipment and energy storage equipment. First, according to the calculated active power of the photovoltaic inverter, the total active power of all photovoltaic inverters is obtained by adding and summing. Then, according to the actual active power of each photovoltaic inverter and the total active power of all photovoltaic inverters, the active power ratio of each photovoltaic inverter is calculated. The active power ratio is obtained by dividing the active power by the total active power. In the above configurable parameters, the absolute value of the total active power output of the new energy in the substation is the fixed value of the photovoltaic reverse active power output. Therefore, the active power ratio is multiplied by the absolute value of the total active power output of the new energy in the substation, and the power adjustment value of each photovoltaic inverter is obtained, that is, the theoretical power reduction value required for each device. The formula for its adjustment value can be expressed as:

[0063]

[0064] Where, △Pe i represents the power regulation value of the i-th photovoltaic inverter, Pe i represents the active power of the i-th photovoltaic inverter, P Q It indicates the absolute value of the total active power output of renewable energy in the substation.

[0065] The power adjustment value will be sent to each photovoltaic device. The active power of the photovoltaic inverter after adjustment according to the adjustment value can be expressed as:

[0066] P i =Pe i -ΔPe i

[0067] After the photovoltaic inverter is adjusted to reduce power, it is determined again whether the reverse load rate of the substation area has dropped to within the reverse load rate threshold. If it is less than the reverse load rate threshold, it means that the potential safety hazard of the distribution network operation has been eliminated and the regulation can be stopped. If the reverse load rate is still greater than the reverse load rate threshold, it means that the excess electric energy cannot be absorbed by the power system and the grid pressure is too high. At this time, the energy storage device will be added to the regulation strategy, and the energy storage device and the photovoltaic device will be coordinated and regulated. The regulation of the energy storage device is to adjust the non-charging energy storage device to the charging state according to the charging and discharging state of the energy storage device, and issue a charging instruction to control all energy storage devices to charge until the battery state of charge SOC of the energy storage device is greater than the battery charge threshold, such as greater than 95%, then the energy storage device stops charging. According to the total output floating control of the new energy active power of the substation area in the configuration parameters, the photovoltaic inverter is automatically controlled in rounds until the reverse load rate of the substation area is less than the reverse load rate threshold. In addition, in a preferred embodiment, based on the coordinated regulation of the photovoltaic inverter and the energy storage device, a charging instruction can also be issued to the charging pile, and the charging pile can be controlled to charge during the low-power period to reduce the operating cost of the charging pile and improve the energy efficiency. The regulation strategy of this embodiment can effectively ensure the safety and stability of the distribution station area operation.

[0068] Another control strategy provided by the present invention is mainly used to control the operating cost of the station area to ensure reasonable and economical operation. When the second control strategy is used for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area. The specific steps include:

[0069] Comparing the load rate of the station area with various load rate thresholds, the load rate thresholds including a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold;

[0070] If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold;

[0071] If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold;

[0072] If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

[0073] In this embodiment, whether to adopt the second control strategy is determined based on the load rate of the substation. There are four load rate thresholds used in this embodiment, namely the first load rate threshold, the second load rate threshold, the third load rate threshold and the stable load rate threshold. These thresholds are all configurable parameters. The first load rate threshold, the second load rate threshold and the third load rate threshold are parameters that increase in sequence, such as 60%, 70% and 80% respectively, and are combined as the threshold range for different operating states of the substation. The stable load rate threshold is used to indicate that the substation is stably operating under this load rate, such as configured to be 75%.

[0074] Compare the real-time calculated area load rate with the above-mentioned load rate thresholds. There will be several results at this time. The first is that the area load rate is less than the first load rate threshold, indicating that the current area load rate is low and the power consumption pressure is small, which belongs to the low power consumption period. At this time, the photovoltaic inverter can be adjusted according to the active power of the photovoltaic inverter to reduce the power according to the adjustment value, and the charging control is performed by issuing charging instructions to the energy storage device. This step is the same as the control step in the first control strategy and will not be repeated here. On this basis, according to the operating status of the charging pile, for the charging pile that has not yet been charged for the connected new energy vehicle or has been charged at a lower output power, the power is increased and regulated to control the charging pile to increase the output power, and the load rate of the area is monitored in real time until the load rate reaches the second load rate threshold.

[0075] When the load rate reaches the second load rate threshold but is less than the stable load rate threshold, the power reduction control of the photovoltaic inverter and the charging control of the energy storage device continue to be executed. The round-based power reduction control can also be used to execute the regulation steps until the load rate of the substation reaches the stable load rate threshold, that is, the substation operates in a stable state.

[0076] When the load rate of the substation is greater than the third load rate threshold, the opposite control steps to the above are adopted, that is, the power of the photovoltaic inverter is increased by regulating the actual active power of the inverter according to the maximum rated active power of the inverter, and the power output capacity is improved. The disconnected inverter can also be restarted; at the same time, according to the charging and discharging status of the energy storage device, a stop charging instruction is issued, and according to the operating status of the energy storage device and the battery charge state, a discharge instruction of the energy storage device is issued. Through auxiliary power supply, the load pressure of the power grid is further reduced. For the charging piles, power reduction regulation is performed, or charging avoidance is performed to ensure the normal operation of the power system until the substation load rate reaches the stable load rate threshold.

[0077] In a preferred embodiment, the power reduction control of the charging pile can adopt a power ratio-based adjustment value calculation method, which is the same as the power reduction control method of the photovoltaic inverter mentioned above. First, according to the output power of each charging pile, the sum of the output powers of the charging piles in the substation is calculated, and the ratio of the output power to the sum of the output powers is used as the output power ratio of the charging pile, and the absolute value of the total energy consumption of the new energy active power in the substation is multiplied by the output power ratio to obtain the power adjustment value of the charging pile. The output power of the charging pile minus the power adjustment value is the output power of the charging pile after power reduction regulation. Furthermore, the power reduction regulation of the charging pile can also be controlled by power down-floating according to the rounds. The down-floating control parameter adopted is the down-floating control of the total energy consumption of the new energy active power in the substation in the configuration parameters. It should be noted that the control strategy and down-floating control in the present invention have their corresponding configurable adjustment time, and the corresponding adjustment control needs to be performed according to the adjustment time.

[0078] In this embodiment, the load rate of the substation is calculated at the minute level. When the load rate of the substation is high, the power output status of all inverters in the substation is detected. If there is an inverter with less actual output, its power output is adjusted to increase. If necessary, the disconnected inverter is turned on to reduce the load pressure of the power grid. During peak power consumption, the energy storage device can also be used as a source to assist photovoltaics and transformers to assist in power supply. Similarly, the charging pile equipment will charge to avoid to ensure the normal operation of the power system. Similarly, during the low power consumption period, the power output status of all inverters in the substation is detected, and the power output can be reduced under certain conditions. If necessary, the inverter can be disconnected according to the status of the substation. During low power consumption and at night, the energy storage device can be charged, and the charging pile can also be charged, which reduces the operating cost of the charging pile and improves energy efficiency.

[0079] In another preferred embodiment, the present invention also uses a PID algorithm to dynamically optimize and adjust the load rate of the station area, and the specific steps include:

[0080] According to the difference between the load rate of the substation and the compared load rate threshold, a PID control algorithm is used to calculate the load adjustment value of the substation, and according to the load adjustment value of the substation, the new energy equipment is regulated to achieve dynamic optimization and regulation of the load rate of the substation.

[0081] In this embodiment, when the second control strategy is used to adjust the load rate of the substation, it is actually impossible to accurately complete the adjustment in one step. In order to ensure that the adjustment can be completed quickly and stably, this embodiment uses the PID algorithm to control the adjustment of the load rate, that is, the required load adjustment value is calculated in real time by the PID algorithm, and the load rate is dynamically optimized and adjusted according to the adjustment value. The PID algorithm optimizes the adjustment control effect through the combination of three links: proportional, integral, and differential. The calculation formula of the PID algorithm can be expressed as:

[0082]

[0083] In the formula, u(t) represents the load regulation value, e(t) represents the deviation, and K p , K i and K d They represent the proportional coefficient, differential coefficient and integral coefficient respectively, and t represents the adjustment time.

[0084] When the above PID algorithm is applied to load rate control, it is only necessary to subtract the current real-time load rate of the area from the preset load rate threshold, and the resulting deviation is e(t). Then, proportional control is performed to continuously make the feedback amount approach the target threshold, such as 75%, K p The larger the value, the faster the adjustment response speed, which may easily lead to unstable load rate. p The smaller the value, the slower the response speed of the adjustment, and the load rate cannot be adjusted quickly. If only the proportion is used, transient errors can be found, and the on-site environment is complex and changeable. At this time, it is necessary to adjust through the integral link. Therefore, when increasing K p The value is kept until the system begins to oscillate stably, and a component is introduced, which is proportional to the integral of the error. Since this integral term will accumulate the errors of the previous several times, it can effectively eliminate the steady-state error (assuming that there are many external factors in the station area that interfere with the load rate and cannot be adjusted upward). Due to the existence of the integral term, the input will increase. This is the role of the integral term. In order to make the load rate more stable, when the adjustment value is about to be very close to the target value, stop the adjustment in advance. At this time, differential control is added to prevent the adjustment from stopping in time and exceeding the target load rate. In addition, if the load rate is adjusted slowly, K can be increased. p If the value oscillates frequently, K should be reduced. pWhen the load rate fluctuates, the load rate is large and the adjustment is slow, the integral time can be reduced. By adding the optimization control of the load rate to the second control strategy, the stability of the control process and the accuracy of the control results can be guaranteed.

[0085] In a preferred embodiment, the present invention also sets a parameter self-learning mode. In this mode, the adjustment parameter values ​​issued by the substation on a daily, weekly, monthly and yearly basis are learned, and the internal startup adjustment value is automatically adjusted according to the learning result, so as to ensure that when no parameters are issued, the internal startup adjustment value is also the most suitable for the current substation environment. At the same time, the operating status of the new energy equipment is monitored in real time, and an alarm is issued when an abnormality occurs in the equipment. For example, when the battery health of the energy storage device decreases, an alarm will be sent. When the working status of the photovoltaic inverter, energy storage device and charging pile is abnormal, an alarm will also be sent. Furthermore, in addition to adopting the above-mentioned control strategy to coordinately control the new energy equipment, the new energy equipment can also be adjusted individually. For example, when the photovoltaic inverter is adjusted individually, the adjustment value of each inverter can be calculated according to the power adjustment value calculation method based on the active power ratio in the control strategy, and the adjustment value can be sent to the corresponding photovoltaic inverter for adjustment; when the energy storage device is adjusted individually, whether the energy storage device is charged or discharged is controlled according to the load rate of the station area and the battery charge state of the energy storage device. For example, when charging adjustment is required, the energy storage device in the non-charging state and the energy storage device with a battery charge state lower than 95% are controlled to charge, and when discharge adjustment is required, the energy storage device in the non-discharging state and the energy storage device with a battery charge state higher than 10% are controlled to discharge; when the charging pile is adjusted individually, it is determined whether to start the charging pile adjustment according to the load rate, and for power reduction adjustment, the value can also be adjusted according to the power adjustment value calculation method based on the output power ratio in the control strategy, and sent to each charging pile for output power adjustment.

[0086] This embodiment provides a substation autonomy method based on coordinated regulation of new energy. The present invention monitors the operating status of photovoltaic equipment, energy storage equipment and charging piles in the substation in real time, combines the on-site control strategy of energy storage, and coordinates photovoltaic equipment, energy storage equipment and charging piles to achieve substation autonomy, thereby effectively reducing the absorption pressure of distributed photovoltaics, achieving optimal charging load regulation and control in the substation, and ensuring safe and stable operation of the distribution station area.

[0087] See also Figure 2 Based on the same inventive concept, the second embodiment of the present invention proposes an autonomous system for a substation based on coordinated regulation of new energy, including:

[0088] The data acquisition module 10 is used to obtain in real time the equipment operation parameters and the area load parameters of the new energy equipment in the distribution area, wherein the equipment operation parameters include the active power of the photovoltaic inverter, the output power of the charging pile, the state of charge of the battery of the energy storage device, and the operation state of the energy storage device, and the area load parameters include the area load rate and the area reverse load rate;

[0089] The device control module 20 is used to control the photovoltaic inverter, energy storage equipment and charging pile in the distribution area according to the device operation parameters and the area load parameters using a preset control strategy, wherein the control strategy includes a first control strategy and a second control strategy;

[0090] Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area;

[0091] When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

[0092] Further, the device control module 20 includes a first control module;

[0093] The first control module is used to determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value. If so, the sum of the inverter powers is calculated according to the active power of the photovoltaic inverters of each photovoltaic inverter, and the active power ratio of each photovoltaic inverter is calculated according to the active power of the photovoltaic inverter and the sum of the inverter power;

[0094] Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area;

[0095] According to the power adjustment value, the active power of each photovoltaic inverter is adjusted down, and it is re-determined whether the reverse load rate of the station area is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating state of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold;

[0096] According to the preset power reduction ratio and rounds, the photovoltaic inverter is controlled to float down until the reverse load rate of the station area is less than the reverse load rate threshold.

[0097] Further, the device control module 20 includes a second control module;

[0098] The second control module is used to compare the load rate of the station area with various load rate thresholds, and the load rate thresholds include a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold;

[0099] If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold;

[0100] If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold;

[0101] If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

[0102] The technical features and technical effects of the substation autonomous system based on coordinated regulation of new energy proposed in the embodiment of the present invention are the same as the method proposed in the embodiment of the present invention, and will not be repeated here. Each module in the above-mentioned substation autonomous system based on coordinated regulation of new energy can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0103] In addition, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0104] See also Figure 3, an internal structure diagram of a computer device in one embodiment, the computer device may specifically be a terminal or a server. The computer device includes a processor, a memory, a network interface, a display, and an input device connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a station area autonomy method based on coordinated regulation of new energy is implemented. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covered on the display screen, or a button, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0105] It can be understood by those skilled in the art that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computing device may include more or fewer components than those shown in the figure, or combine certain components, or have the same component arrangement.

[0106] In addition, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0107] In summary, the embodiments of the present invention propose a substation autonomous method, system, device and medium based on the coordinated regulation of new energy. The method obtains the equipment operating parameters and substation load parameters of the new energy equipment in the distribution substation in real time. The equipment operating parameters include the active power of the photovoltaic inverter, the output power of the charging pile, the battery charge state of the energy storage device and the operating state of the energy storage device. The substation load parameters include the substation load rate and the substation reverse load rate. According to the equipment operating parameters and the substation load parameters, a preset regulation strategy is adopted to regulate the photovoltaic inverter, energy storage device and charging pile in the distribution substation. The regulation strategy includes a first regulation strategy and a second regulation strategy. Among them, when the first regulation strategy is adopted for regulation, the photovoltaic inverter and the energy storage device are coordinated and regulated according to the reverse load rate of the substation; when the second regulation strategy is adopted for regulation, the photovoltaic inverter, the energy storage device and the charging pile are coordinated and regulated according to the load rate of the substation. The present invention monitors the operating status of photovoltaic equipment, energy storage equipment and charging piles in the substation in real time, combines the on-site control strategy of energy storage, and coordinates photovoltaic equipment, energy storage equipment and charging piles to achieve substation autonomy, effectively reducing the absorption pressure of distributed photovoltaics, realizing the optimal charging load regulation and control in the substation, and ensuring the safe and stable operation of the distribution station area.

[0108] Each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment can be directly referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. It should be noted that the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above-mentioned embodiments only express several preferred implementation modes of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in the technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be based on the protection scope of the claims.

Claims

1. A regional autonomy method based on coordinated regulation of new energy, characterized in that: include: Real-time acquisition of equipment operating parameters and area load parameters of new energy equipment in the distribution area, the equipment operating parameters include photovoltaic inverter active power, charging pile output power, energy storage equipment battery charge state and energy storage equipment operation state, the area load parameters include area load rate and area reverse load rate; According to the equipment operation parameters and the area load parameters, a preset control strategy is used to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area, wherein the control strategy includes a first control strategy and a second control strategy; Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area; When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

2. The area autonomy method based on new energy coordinated regulation according to claim 1 is characterized in that: The step of obtaining the equipment operation parameters and area load parameters of the new energy equipment in the distribution area in real time includes: Calculate the active power of the photovoltaic inverter according to the voltage value, current value and operating status of the photovoltaic inverter in the distribution station area; Calculate the output power of the charging pile according to the voltage value, current value and operating status of the charging pile in the distribution station area; According to the grid voltage value, grid current value and grid rated power value in the distribution station area, the substation load rate and substation reverse load rate are calculated.

3. The method for substation autonomy based on coordinated regulation of new energy according to claim 1 is characterized in that: The step of collaboratively regulating the photovoltaic inverter and the energy storage device according to the reverse load rate of the station area includes: Determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value, and if so, calculate the sum of the inverter powers according to the active powers of the photovoltaic inverters of each photovoltaic inverter, and calculate the active power ratio of each photovoltaic inverter according to the active power of the photovoltaic inverter and the sum of the inverter powers; Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area; The active power of each photovoltaic inverter is adjusted down according to the power regulation value, and it is re-determined whether the reverse load rate of the substation is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating status of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold, and the photovoltaic inverter is controlled to float down according to the preset power reduction ratio and rounds until the reverse load rate of the substation is less than the reverse load rate threshold.

4. The method for substation autonomy based on coordinated regulation of new energy according to claim 1, characterized in that: The step of collaboratively regulating the photovoltaic inverter, the energy storage device and the charging pile according to the load rate of the station area includes: Comparing the load rate of the station area with various load rate thresholds, the load rate thresholds including a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold; If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold; If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold; If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

5. The method for substation autonomy based on coordinated regulation of new energy according to claim 4 is characterized in that: After the step of comparing the load rate of the station area with each load rate threshold, the method further includes: According to the difference between the load rate of the substation and the compared load rate threshold, a PID control algorithm is used to calculate the load adjustment value of the substation, and according to the load adjustment value of the substation, the new energy equipment is regulated to achieve dynamic optimization and regulation of the load rate of the substation.

6. A substation autonomous system based on coordinated regulation of new energy, characterized in that: include: The data acquisition module is used to obtain the equipment operation parameters and area load parameters of the new energy equipment in the distribution area in real time. The equipment operation parameters include the active power of the photovoltaic inverter, the output power of the charging pile, the state of charge of the battery of the energy storage device, and the operation state of the energy storage device. The area load parameters include the area load rate and the area reverse load rate; An equipment control module, used to control the photovoltaic inverter, energy storage equipment and charging piles in the distribution area according to the equipment operation parameters and the area load parameters using a preset control strategy, wherein the control strategy includes a first control strategy and a second control strategy; Wherein, when the first control strategy is adopted for control, the photovoltaic inverter and the energy storage device are coordinated and controlled according to the reverse load rate of the station area; When the second control strategy is adopted for control, the photovoltaic inverter, energy storage equipment and charging pile are coordinated and controlled according to the load rate of the station area.

7. The autonomous system for substations based on coordinated regulation of new energy sources according to claim 6 is characterized in that: The device control module includes a first control module; The first control module is used to determine whether the reverse load rate of the substation is greater than the reverse load rate threshold value. If so, the sum of the inverter powers is calculated according to the active power of the photovoltaic inverters of each photovoltaic inverter, and the active power ratio of each photovoltaic inverter is calculated according to the active power of the photovoltaic inverter and the sum of the inverter power; Calculate the power regulation value of each photovoltaic inverter according to the active power ratio and the preset absolute value of the total active power output of the new energy source in the substation area; According to the power adjustment value, the active power of each photovoltaic inverter is adjusted down, and it is re-determined whether the reverse load rate of the station area is greater than the reverse load rate threshold. If so, a charging instruction is issued according to the operating state of the energy storage device to control the energy storage device to charge until the battery charge state of the energy storage device is greater than the battery charge threshold; According to the preset power reduction ratio and rounds, the photovoltaic inverter is controlled to float down until the reverse load rate of the station area is less than the reverse load rate threshold.

8. The autonomous system for substations based on coordinated regulation of new energy sources according to claim 6 is characterized in that: The device control module includes a second control module; The second control module is used to compare the load rate of the station area with various load rate thresholds, and the load rate thresholds include a first load rate threshold, a second load rate threshold, a third load rate threshold and a stable load rate threshold; If the load rate of the area is less than the first load rate threshold, the photovoltaic inverter is regulated to decrease power according to the active power of the photovoltaic inverter, the energy storage device is regulated to charge according to the operating state of the energy storage device, and the charging pile is regulated to increase power according to the output power of the charging pile, until the load rate of the area reaches the second load rate threshold; If the load rate of the substation is greater than or equal to the second load rate threshold and less than the stable load rate threshold, the photovoltaic inverter is regulated to reduce power according to the active power of the photovoltaic inverter, and the energy storage device is regulated to charge according to the operating state of the energy storage device until the load rate of the substation reaches the stable load rate threshold; If the load rate of the substation is greater than the third load rate threshold, the photovoltaic inverter is power-up regulated according to the active power of the photovoltaic inverter, the energy storage device is discharged according to the operating status of the energy storage device, and the charging pile is power-down regulated according to the output power of the charging pile, until the load rate of the substation reaches the stable load rate threshold.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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