Distributed photovoltaic grid-connected power automatic regulation control method and device

Abstract

The invention discloses an automatic regulation and control method and device for distributed photovoltaic grid-connected power, relates to the technical field of photovoltaic power station power regulation and control, and solves the technical problems that the response speed is low, the regulation precision is low or the characteristics of a distributed photovoltaic power station cannot be fully considered. According to the method, the output power and the regional electric power of the distributed photovoltaic power station are accurately acquired, and an efficient comparison algorithm is adopted, so that the balance of the grid-connected power of the photovoltaic power station can be accurately judged in real time, and reliable balance monitoring signals and unbalance analysis signals are generated; when the power is unbalanced, the adjusting power of each power station is calculated by adopting a scientific and reasonable proportional distribution algorithm according to the total power generation power of the distributed power station, the regional total power utilization power and the actual operation parameters of each power station, so that the diversity and complexity of the distributed photovoltaic power station can be better adapted, the effect and efficiency of active power adjustment are improved, and the power utilization efficiency of the distributed photovoltaic power station is improved. And the balance and stability of the active power of the power grid can be maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power station power regulation, and in particular to a distributed photovoltaic grid-connected power automatic regulation control method and device. Background Art

[0002] As the global demand for clean energy continues to grow, distributed photovoltaic power generation has been widely used as an important form of renewable energy utilization. Distributed photovoltaic power stations are usually connected to medium and low voltage distribution networks, and their output power is random, volatile and intermittent, which brings many challenges to the stable operation of the power grid.

[0003] Publication number CN105226829A discloses a photovoltaic power station integrated automation system, which includes a sub-array layer, a sub-array ring network layer, a spacing layer, a network layer, and a station control layer from bottom to top. In the sub-array layer, each photovoltaic sub-array is installed with a photovoltaic sub-array integrated device; in the sub-array ring network layer, the power generation partitions are divided according to the actual project, and the integrated devices in the power generation partitions form mutually isolated sub-array ring networks; in the spacing layer, the power generation partitions are used as units for partition monitoring; in the network layer, it is divided into multiple data networks according to different applications, and each data network is isolated from each other; in the station control layer, the station control layer equipment exchanges data with the spacing layer equipment through the network layer.

[0004] However, the large-scale access of distributed photovoltaics has changed the power flow and load characteristics of the power grid, making the operation and management of the power grid more complicated. The existing grid regulation methods often have shortcomings such as slow response speed, low regulation accuracy or failure to fully consider the characteristics of distributed photovoltaic power stations when dealing with power changes of distributed photovoltaics. It is difficult to achieve efficient and accurate control of distributed photovoltaic grid-connected power, which in turn restricts the further large-scale integration and optimal utilization of distributed photovoltaic power generation in the power grid. Summary of the invention In view of the deficiencies in the prior art, the present invention provides a distributed photovoltaic grid-connected power automatic regulation and control method and device, which solves the problems of slow response speed, low regulation accuracy or failure to fully consider the characteristics of the distributed photovoltaic power station itself.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a distributed photovoltaic grid-connected power automatic regulation and control method, the method specifically comprising the following steps: Step S001: monitor the output power of the distributed photovoltaic power station, judge the balance of the photovoltaic power station's grid-connected power by comparing the power consumption with the output power, and generate a balance judgment result; Step S002: Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the output power corresponding to the distributed power station, and distribute it proportionally according to the power difference to generate corresponding grid-connected adjustment information; Step S003: adjusting the active power of the distributed power station based on the obtained grid-connected adjustment information, optimizing and adjusting the active current of the distributed power station by analyzing the active stable voltage of the inverter, and generating active adjustment information; Step S004: adjusting the reactive power of the distributed power station based on the obtained grid-connected adjustment information, optimizing and adjusting the reactive current of the distributed power station by analyzing the reactive stability voltage of the inverter, and generating reactive adjustment information; Step S005: Analyze the corresponding balance analysis signal in the balance judgment result, optimize the grid-connected power of the entire distributed power station by the reactive power optimization method, and generate optimization adjustment information.

[0006] As a further solution of the present invention, the specific method of generating the balance judgment result in step S001 is: The power generation of the regional distributed photovoltaic power station is obtained, and the corresponding power consumption is obtained at the same time, and the obtained power generation power is compared with the power consumption. If the power generation power is the same as the power consumption, it means that the two are balanced, and a balance monitoring signal is generated. Conversely, if the power generation power is different from the power consumption, it means that the two are unbalanced, and an unbalance analysis signal is generated.

[0007] As a further solution of the present invention, the specific method of analyzing the unbalanced analysis signal corresponding to the balance judgment result in step S002 is: Obtain the total power generation corresponding to the distributed power station and the total power consumption of the corresponding area, and calculate the difference between the two and record it as the power difference and record it as Pc. At the same time, obtain the number of distributed power stations and label it as i, where i=1, 2, ..., j, where j represents the number of distributed power stations. Then, according to the formula The total output power Pc of the current cluster is calculated, Pi is the output power of the corresponding distributed power station, and based on the formula The analysis results in the corresponding distributed power station regulation power r i , where P1 is the power difference, and generates online adjustment information.

[0008] As a further solution of the present invention, the specific method of generating active power regulation information in step S003 is: Get the inverter of the distributed power station, then get the corresponding adjustment power of the distributed power station, record it as Pt, and get the power factor of the inverter at the same time , and obtain the apparent power S corresponding to the distributed power station, and then according to the formula The active power P corresponding to the distributed power station is calculated, and the active power value to be adjusted is calculated based on the calculated active power and converted into the adjustment amount of the inverter output current or voltage, where U is the voltage and I is the current. The corresponding stable voltage is determined based on the working condition of the inverter and recorded as U1. At the same time, the calculated U1 is substituted into the formula to calculate the corresponding stable current I1; The current current Is of the distributed power station is obtained, and the current current Is is adjusted with the stable current as the I1 standard. Specifically, the difference between the two is calculated to generate the active adjustment current value and the active adjustment information.

[0009] As a further solution of the present invention, the specific method of generating reactive power regulation information in step S004 is: Obtain the apparent power S and active power P corresponding to the distributed power station, and use the formula The reactive power Q of the distributed power station is calculated, and then the stable voltage U1 is obtained. At the same time, according to the droop characteristic relationship between voltage and reactive power, it is expressed as follows: ,in is the voltage change, k Q is the voltage-reactive power droop coefficient, and the obtained formula is integrated to solve the reactive power regulation. The specific integration formula is: According to the above formula, the reactive power regulation is calculated , where U s is the original voltage value of the distributed power station; Then, according to the reactive power adjustment amount Calculate and adjust the reactive current, and substitute the obtained parameters into the formula Calculate and adjust the reactive current , and generate reactive power regulation information at the same time.

[0010] As a further solution of the present invention, the specific method of generating the optimization adjustment information in step S005 is: Step 1: Accurately install high-precision voltage transformers and power factor measurement devices at the access points of the photovoltaic power station, and set the corresponding data collection frequency; Step 2: In-depth analysis of the grid's operating requirements and comprehensive assessment of the PV power station's own characteristics; Step 3: Seamlessly integrate advanced reactive power control functions into the inverter control system and adopt digital control technology; Step 4: Transmit the data fed back by the voltage transformer and the power factor measurement device to the control unit of the inverter control system in real time.

[0011] A distributed photovoltaic grid-connected power automatic regulation and control device, comprising a data acquisition module, a data analysis module and an information output module; The data acquisition module is used to obtain the output power of the distributed photovoltaic power station and the regional power consumption, and transmit the two to the data analysis module; A data analysis module, which is used to compare the power consumption with the output power, determine the balance of the grid-connected power of the photovoltaic power station, and generate a balance determination result, and the balance determination result includes a balance monitoring signal and an unbalance analysis signal; Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the output power corresponding to the distributed power station, and distribute it proportionally according to the power difference, generate the corresponding grid-connected adjustment information, adjust the active power of the distributed power station based on the obtained grid-connected adjustment information, optimize and adjust the active current of the distributed power station by combining the active stable voltage of the inverter, and generate active adjustment information, adjust the reactive power of the distributed power station corresponding to the obtained grid-connected adjustment information, optimize and adjust the reactive current of the distributed power station by combining the reactive stable voltage of the inverter, and generate reactive adjustment information; Analyze the corresponding balance analysis signal in the balance judgment result, optimize the grid-connected power of the entire distributed power station through the reactive power optimization method, and generate optimization adjustment information; At the same time, the generated reactive power regulation information, active power regulation information and optimized regulation information are transmitted to the information output module; The information output module is used to display the acquired information to the corresponding operator.

[0012] Beneficial Effects The present invention provides a distributed photovoltaic grid-connected power automatic regulation and control method and device. Compared with the prior art, it has the following beneficial effects: The present invention can accurately and in real time determine the balance of the photovoltaic power station's grid-connected power by accurately acquiring the output power and regional power consumption of the distributed photovoltaic power station and adopting an efficient comparison algorithm, and generate reliable balance monitoring signals and unbalanced analysis signals. Compared with traditional monitoring methods, the present invention greatly improves the accuracy and timeliness of power monitoring, provides a solid data foundation for subsequent power regulation, and effectively avoids the risk of power grid operation caused by monitoring errors or delays. When the power is unbalanced, a scientific and reasonable proportional allocation algorithm is used to calculate the regulated power of each power station based on the total power generation of the distributed power station, the total power consumption of the region, and the actual operating parameters of each power station. At the same time, combined with the active stable voltage characteristics of the inverter, the regulated power is accurately converted into the regulated amount of the inverter output current or voltage through precise formula derivation, realizing the refined regulation of active power, which can better adapt to the diversity and complexity of distributed photovoltaic power stations, improve the effect and efficiency of active power regulation, and help maintain the balance and stability of the active power of the power grid; In terms of reactive power regulation, this method fully considers many key factors. Through rigorous formula integration and derivation, the reactive power regulation is accurately calculated and converted into reactive current regulation. This enables reactive power regulation to respond more accurately to grid voltage changes, effectively compensate for reactive power demand, maintain grid voltage fluctuations within an allowable range, and improve grid voltage stability and power quality. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a step method diagram of the present invention; Figure 2 This is a diagram of the module assembly of the device of the present invention. DETAILED DESCRIPTION

[0013] 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.

[0014] For example, see Figure 1 The present application provides a distributed photovoltaic grid-connected power automatic regulation and control method, the method specifically comprising the following steps: Step S001: monitor the output power of the distributed photovoltaic power station, judge the balance of the photovoltaic power station's grid-connected power by comparing the power consumption with the output power, and generate a balance judgment result.

[0015] The power generation power of the regional distributed photovoltaic power station is obtained, and the corresponding power consumption is obtained at the same time. The power generation power represents the total power generation power corresponding to all power stations, and the power consumption power represents the total power consumption corresponding to the region. The obtained power generation power and power consumption are compared. If the power generation power is the same as the power consumption, it means that the two are balanced, and a balance monitoring signal is generated. Otherwise, if the power generation power is different from the power consumption power, it means that the two are unbalanced, and an unbalance analysis signal is generated.

[0016] For example, at a certain moment, the total power generation of the regional distributed photovoltaic power station is measured to be 800kW, and the corresponding total regional power consumption is 800kW through the grid data feedback. The two values ​​are exactly the same. The system automatically determines that the power generation and power consumption are in a balanced state and generates a balance monitoring signal. On the contrary, if at another moment, the power generation is monitored to be 800kW and the power consumption is 700kW, there is a difference between the two values, indicating that the power generation and power consumption are unbalanced. At this time, the system quickly generates an imbalance analysis signal.

[0017] Step S002: Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the output power corresponding to the distributed power station, and distribute it proportionally according to the power difference to generate corresponding grid-connected adjustment information.

[0018] Obtain the total power generation corresponding to the distributed power station and the total power consumption of the corresponding area, and calculate the difference between the two and record it as the power difference and record it as Pc. At the same time, obtain the number of distributed power stations and label it as i, where i=1, 2, ..., j, where j represents the number of distributed power stations. Then, according to the formula The total output power Pc of the current cluster is calculated, Pi is the output power of the corresponding distributed power station, and based on the formula The analysis results in the corresponding distributed power station regulation power r i , where P1 is the power difference, and generates online adjustment information.

[0019] Assume that there is a distributed photovoltaic park with three photovoltaic power stations A, B, and C. The power grid requires the park to reduce the total power Pc=200kW. The current output power of power station A is P A =180kW, the current output power of power station B is P B =270kW, the current output power of power station C is P B =450kW, total current output power = 180+270+450=900kW; For power station A, , for power station B, , for power station C, , and further obtain the regulated power of the corresponding power stations A, B and C.

[0020] Step S003: Based on the obtained grid-connected regulation information, the active power of the distributed power station is regulated, and by analyzing the active stable voltage of the inverter, the active current of the distributed power station is optimized and regulated to generate active regulation information.

[0021] Get the inverter of the distributed power station, then get the corresponding adjustment power of the distributed power station, record it as Pt, for example, Pt=50kW, and get the power factor of the inverter at the same time , for example, the power factor is 0.9, and the apparent power S corresponding to the distributed power station is obtained, and the apparent power represents the capacity of the AC electrical equipment, specifically S=UI, for example S=60kVA, then according to the formula The active power P corresponding to the distributed power station is calculated. Based on the above numerical calculation, the active power P=60×0.9=54kW is obtained. At the same time, the active power value to be adjusted is converted into the adjustment amount of the inverter output current or voltage according to the calculated active power. The specific formula is: , where U is voltage, I is current, and the corresponding stable voltage is determined based on the working condition of the inverter and recorded as U1, and the stable working voltage here is expressed as the corresponding voltage value under stable working conditions, for example, U1=380V, and the calculated U1 is substituted into the formula to calculate the corresponding stable current I1. According to the formula The calculated stable current I1=146.7A.

[0022] The current current Is of the distributed power station is obtained, and the current current Is is adjusted based on the stable current as the I1 standard. Specifically, the difference between the two is calculated to generate the active adjustment current value, and the active adjustment information is generated. The current Is=160A of the distributed power station is obtained through the current transformer, and the current difference is further calculated based on the stable current. =160-164.7=13.3A.

[0023] Step S004: Based on the obtained grid-connected regulation information, the reactive power of the corresponding distributed power station is regulated, and by analyzing the reactive stability voltage of the inverter, the reactive current of the distributed power station is optimized and regulated to generate reactive regulation information.

[0024] Obtain the apparent power S and active power P corresponding to the distributed power station, and use the formula The reactive power Q of the distributed power station is calculated, and the calculated reactive power and the active power calculated in the above steps are the data of the same distributed power station. Then the stable voltage U1 is obtained, and the stable voltage value here is the same as the corresponding stable voltage value in step 3. At the same time, according to the droop characteristic relationship between voltage and reactive power, it is expressed by the formula: ,in is the voltage change, k Q is the voltage-reactive power droop coefficient, and the obtained formula is integrated to solve the reactive power regulation. The specific integration formula is: According to the above formula, the reactive power regulation is calculated , where U s is the original voltage value of the distributed power station; Assume that the voltage-reactive power droop coefficient k at the access point of a photovoltaic power station is Q =V / kvar, the voltage to be reduced =4V, then the reactive power regulation amount calculated according to the formula is -2kvar.

[0025] Then, according to the reactive power adjustment amount Calculate and adjust the reactive current, and substitute the obtained parameters into the formula Calculate and adjust the reactive current , and generate reactive power regulation information at the same time.

[0026] Assume that the voltage-reactive power droop coefficient ko of a distributed photovoltaic system is 2V / kvar, the grid access point voltage Us is 380V, and the voltage needs to be reduced by ΔU=5V according to the grid operation requirements. First, the reactive power adjustment amount is calculated according to the formula mentioned above = -2.5kvar, and then the reactive current adjustment amount is calculated -6.6A (same conversion of kvar to var). The negative sign indicates that the direction of reactive current adjustment is to reduce reactive power in order to achieve the purpose of reducing voltage.

[0027] Step S005: Analyze the corresponding balance analysis signal in the balance judgment result, optimize the grid-connected power of the entire distributed power station by the reactive power optimization method, and generate optimization adjustment information.

[0028] Step 1: Accurately install high-precision voltage transformers and power factor measurement devices at the access points of the photovoltaic power station to ensure accurate and real-time monitoring of the grid voltage and power factor. For voltage transformers, select devices with a precision of 0.2 and a transformation ratio of [specific transformation ratio value, such as 10kV / 100V], and set the corresponding data acquisition frequency. The data sampling frequency is set to no less than 100 times per second to capture small changes in voltage and power factor in a timely manner. For example, in a distributed photovoltaic power station with an installed capacity of 5MW, select a voltage transformer with a precision of 0.2 and a power factor measurement instrument with a high-precision measurement chip, and install them in the switch cabinet connecting the power station to the grid to provide a reliable data basis for subsequent control.

[0029] Step 2: In-depth analysis of the operation requirements of the power grid, including the voltage quality standards of the power grid (such as the voltage fluctuation range allowed is within ±5% of the rated voltage), reactive compensation capacity planning, and load characteristics at different times. At the same time, a comprehensive assessment of the characteristics of the photovoltaic power station itself, such as the installed capacity of the power station, the type and performance of the inverter (for example, the reactive power adjustment range of the inverter is -300kvar to +300kvar, and the response time is less than 20 milliseconds), and the impact of the component layout on the stability of the power generation. Taking the 3MW distributed photovoltaic power station as an example, the voltage of the power grid in the area is prone to be low during the peak period of industrial electricity consumption during the day (9 am to 5 pm), and there are many inductive loads around, requiring the photovoltaic power station to provide certain reactive support. The components of the power station are installed in a flat-laying manner, and the power generation is relatively stable in clear weather, but there will be certain power fluctuations in cloudy weather.

[0030] Step 3: Seamlessly integrate advanced reactive power control functions into the inverter control system, and use digital control technology to improve control accuracy and response speed. Use a high-performance digital signal processor (DSP) as the control core to write a dedicated reactive power control algorithm code. For example, a control algorithm based on the voltage-reactive power droop characteristic is used, and it is optimized in combination with fuzzy logic control. When the voltage is low, the reactive power output is quickly increased by accurately adjusting the phase difference between the inverter output voltage and current to increase the grid voltage. In the above-mentioned 3MW photovoltaic power station, when the grid voltage drops to 95% of the rated voltage, the inverter control system can increase the reactive power output from 0kvar to 150kvar within 10 milliseconds according to the algorithm, effectively supporting the grid voltage.

[0031] Step 4: Establish an efficient feedback mechanism, and transmit the data fed back by the voltage transformer and the power factor measurement device to the control unit of the inverter control system in real time through high-speed data communication lines. Adopting the closed-loop control principle, when the grid voltage or power factor is detected to deviate from the set range, the control unit quickly calculates and adjusts the reactive power output command to ensure that the grid voltage and power factor can be quickly and stably maintained within the set range. For example, the allowable fluctuation range of the grid voltage is set to ±3% of the rated voltage, and the target value of the power factor is between 0.95-0.98. Once the voltage is detected to be lower than the set lower limit or the power factor exceeds the target range, the inverter control system immediately adjusts the reactive power output, such as increasing the reactive power output to increase the voltage when the voltage is low, and appropriately reducing the reactive power output to return it to the target range when the power factor is too high. In an actual photovoltaic power station, through this feedback mechanism, the fluctuation of the grid voltage is effectively controlled within ±2%, and the power factor is stabilized between 0.96-0.97, which greatly improves the power quality and stability of the grid.

[0032] Embodiment 2, as Embodiment 2 of the present invention, this embodiment is implemented on the basis of Embodiment 1, and the difference from Embodiment 1 is as follows: In step S002, the output power corresponding to the distributed power station is analyzed and proportionally distributed according to the power difference. However, in this embodiment, the active power and reactive power are adjusted by a calculation method based on the power factor, and the specific adjustment method is: Power Factor It is the ratio of the active power (P) to the apparent power (S) in the AC circuit, that is, ,at the same time , where Q is reactive power, if the total power to be regulated (apparent power) is known (e.g., derived from grid dispatch requirements or power imbalance calculations) and power factor , the regulation amount of active power and reactive power can be calculated; Known apparent power to be regulated , active power regulation = × , reactive power regulation .

[0033] Assume that the apparent power to be adjusted is calculated based on the power balance =50kW, system power factor =0.9, first calculate the active power regulation: =45kW, then calculate the reactive power regulation: ≈21.8kW.

[0034] Embodiment 3, as the embodiment 3 of the present invention, focuses on combining the implementation processes of embodiment 1 and embodiment 2 for implementation.

[0035] Example 4, please refer to Figure 2 The present application provides a distributed photovoltaic grid-connected power automatic regulation and control device, which specifically includes a data acquisition module, a data analysis module and an information output module. Figure 2 It can be known that the transmission between the above functional modules is one-way.

[0036] The data acquisition module is used to obtain the output power of the distributed photovoltaic power station and the regional power consumption, and transmit the two to the data analysis module.

[0037] A data analysis module is used to compare the power consumption with the output power, determine the balance of the grid-connected power of the photovoltaic power station, and generate a balance determination result, and the balance determination result includes a balance monitoring signal and an unbalanced analysis signal; and the specific processing method is the same as the processing process of step S001 in embodiment 1.

[0038] Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the corresponding output power of the distributed power station, and distribute it proportionally according to the power difference, and generate the corresponding grid-connected adjustment information, and the specific processing method is the same as the processing process of step S002 in Example 1. Based on the obtained grid-connected adjustment information, adjust the active power of the distributed power station, and optimize and adjust the active current of the distributed power station by combining the active stable voltage of the inverter to generate active adjustment information, and the specific processing method is the same as the processing process of step S003 in Example 1. Based on the obtained grid-connected adjustment information, adjust the reactive power of the corresponding distributed power station, and optimize and adjust the reactive current of the distributed power station by combining the reactive stable voltage of the inverter to generate reactive adjustment information; and the specific processing method is the same as the processing process of step S004 in Example 1.

[0039] The corresponding balance analysis signal in the balance judgment result is analyzed, the grid-connected power of the entire distributed power station is optimized by the reactive power optimization method, and the optimization adjustment information is generated; and the specific processing method is the same as the processing process of step S005 in embodiment 1.

[0040] At the same time, the generated reactive power regulation information, active power regulation information and optimized regulation information are transmitted to the information output module; The information output module is used to display the acquired information to the corresponding operator.

[0041] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A distributed photovoltaic grid-connected power automatic regulation and control method, characterized in that: The method specifically comprises the following steps: Step S001: monitor the output power of the distributed photovoltaic power station, judge the balance of the photovoltaic power station's grid-connected power by comparing the power consumption with the output power, and generate a balance judgment result; Step S002: Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the output power corresponding to the distributed power station, and distribute it proportionally according to the power difference to generate corresponding grid-connected adjustment information; Step S003: adjusting the active power of the distributed power station based on the obtained grid-connected adjustment information, optimizing and adjusting the active current of the distributed power station by analyzing the active stable voltage of the inverter, and generating active adjustment information; Step S004: adjusting the reactive power of the distributed power station based on the obtained grid-connected adjustment information, optimizing and adjusting the reactive current of the distributed power station by analyzing the reactive stability voltage of the inverter, and generating reactive adjustment information; Step S005: Analyze the corresponding balance analysis signal in the balance judgment result, optimize the grid-connected power of the entire distributed power station by the reactive power optimization method, and generate optimization adjustment information.

2. A distributed photovoltaic grid-connected power automatic regulation and control method according to claim 1, characterized in that: The specific method of generating the balance judgment result in step S001 is: The power generation of the regional distributed photovoltaic power station is obtained, and the corresponding power consumption is obtained at the same time, and the obtained power generation power is compared with the power consumption. If the power generation power is the same as the power consumption, it means that the two are balanced, and a balance monitoring signal is generated. Conversely, if the power generation power is different from the power consumption, it means that the two are unbalanced, and an unbalance analysis signal is generated.

3. A distributed photovoltaic grid-connected power automatic regulation and control method according to claim 1, characterized in that: The specific method of analyzing the unbalanced analysis signal corresponding to the balance judgment result in step S002 is: Obtain the total power generation corresponding to the distributed power station and the total power consumption of the corresponding area, and calculate the difference between the two and record it as the power difference and record it as Pc. At the same time, obtain the number of distributed power stations and label it as i, where i=1, 2, ..., j, where j represents the number of distributed power stations. Then, according to the formula The total output power Pc of the current cluster is calculated, Pi is the output power of the corresponding distributed power station, and based on the formula The analysis results in the corresponding distributed power station regulation power r i , where P1 is the power difference, and generates online adjustment information.

4. A distributed photovoltaic grid-connected power automatic regulation and control method according to claim 1, characterized in that: The specific method of generating the active power adjustment information in step S003 is: Get the inverter of the distributed power station, then get the corresponding adjustment power of the distributed power station, record it as Pt, and get the power factor of the inverter at the same time , and obtain the apparent power S corresponding to the distributed power station, and then according to the formula The active power P corresponding to the distributed power station is calculated, and the active power value to be adjusted is calculated based on the calculated active power and converted into the adjustment amount of the inverter output current or voltage, where U is the voltage and I is the current. The corresponding stable voltage is determined based on the working condition of the inverter and recorded as U1. At the same time, the calculated U1 is substituted into the formula to calculate the corresponding stable current I1; The current current Is of the distributed power station is obtained, and the current current Is is adjusted with the stable current as the I1 standard. Specifically, the difference between the two is calculated to generate the active adjustment current value and the active adjustment information.

5. A distributed photovoltaic grid-connected power automatic regulation and control method according to claim 1, characterized in that: The specific method of generating reactive power adjustment information in step S004 is: Obtain the apparent power S and active power P corresponding to the distributed power station, and use the formula The reactive power Q of the distributed power station is calculated, and then the stable voltage U1 is obtained. At the same time, according to the droop characteristic relationship between voltage and reactive power, it is expressed as follows: ,in is the voltage change, k Q is the voltage-reactive power droop coefficient, and the obtained formula is integrated to solve the reactive power regulation amount. The specific integration formula is: According to the above formula, the reactive power regulation is calculated , where U s is the original voltage value of the distributed power station; Then, according to the reactive power adjustment amount Calculate and adjust the reactive current, and substitute the obtained parameters into the formula Calculate and adjust the reactive current , and generate reactive power regulation information at the same time.

6. A distributed photovoltaic grid-connected power automatic regulation and control method according to claim 1, characterized in that: The specific method of generating the optimization adjustment information in step S005 is: Step 1: Accurately install high-precision voltage transformers and power factor measurement devices at the access points of the photovoltaic power station, and set the corresponding data collection frequency; Step 2: In-depth analysis of the grid's operating requirements and comprehensive assessment of the PV power station's own characteristics; Step 3: Seamlessly integrate advanced reactive power control functions into the inverter control system and adopt digital control technology; Step 4: Transmit the data fed back by the voltage transformer and the power factor measurement device to the control unit of the inverter control system in real time.

7. A distributed photovoltaic grid-connected power automatic regulation and control device, used to execute a distributed photovoltaic grid-connected power automatic regulation and control method as claimed in any one of claims 1 to 6, characterized in that: It includes a data acquisition module, a data analysis module and an information output module.

8. A distributed photovoltaic grid-connected power automatic regulation and control device according to claim 7, characterized in that: The data acquisition module is used to obtain the output power of the distributed photovoltaic power station and the regional power consumption, and transmit the two to the data analysis module; A data analysis module, which is used to compare the power consumption with the output power, determine the balance of the grid-connected power of the photovoltaic power station, and generate a balance determination result, and the balance determination result includes a balance monitoring signal and an unbalance analysis signal; Analyze the unbalanced analysis signal corresponding to the balance judgment result, analyze the output power corresponding to the distributed power station, and distribute it proportionally according to the power difference, generate the corresponding grid-connected adjustment information, adjust the active power of the distributed power station based on the obtained grid-connected adjustment information, optimize and adjust the active current of the distributed power station by combining the active stable voltage of the inverter, and generate active adjustment information, adjust the reactive power of the distributed power station corresponding to the obtained grid-connected adjustment information, optimize and adjust the reactive current of the distributed power station by combining the reactive stable voltage of the inverter, and generate reactive adjustment information; Analyze the corresponding balance analysis signal in the balance judgment result, optimize the grid-connected power of the entire distributed power station through the reactive power optimization method, and generate optimization adjustment information; At the same time, the generated reactive power regulation information, active power regulation information and optimized regulation information are transmitted to the information output module; The information output module is used to display the acquired information to the corresponding operator.

Images