Photovoltaic energy storage grid-connected operation control method and system

Abstract

The present invention relates to the technical field of photovoltaic energy storage, and discloses a photovoltaic energy storage grid-connected operation control method and system, which obtains load electric energy corresponding to a photovoltaic power station, compares and processes the load electric energy with the output electric energy of the photovoltaic power station, and obtains an energy storage system status signal; based on the energy storage system status signal, obtains the operation status data of the energy storage system, obtains the energy storage system operation status value, and completes the energy storage system status identification according to the energy storage system operation status value. In the process of comparing the load electric energy with the output electric energy of the photovoltaic power station, the present invention processes the dust coverage rate and the use temperature of the photovoltaic panel during the use process of the output electric energy of the photovoltaic power station, so that the output electric energy of the photovoltaic power station obtained is more accurate, and the comparison with the load electric energy is more accurate, so that the power generation of the photovoltaic power station and the use status of the load end can be accurately identified, so that the staff can more accurately grasp the working status of the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic energy storage, and in particular to a photovoltaic energy storage grid-connected operation control method and system. Background Art

[0002] The photovoltaic energy storage grid-connected operation control method refers to the use of control and management means to convert the electrical energy (direct current) generated by the photovoltaic system into alternating current that meets the requirements of the public power grid through a grid-connected inverter, and then connect it to the public power grid. At the same time, it combines energy storage equipment to achieve storage and scheduling of electrical energy to ensure the stable operation of the system and optimize the efficiency of electrical energy use.

[0003] For example, patent publication number CN219739974U discloses a photovoltaic energy storage grid-connected operation system, which controls each high-voltage connection switch by monitoring the power of photovoltaic power generation and the power status of the energy storage container, and finally reasonably distributes the energy to each module through the connection of the high-voltage line to avoid energy waste.

[0004] In the prior art, in the process of obtaining the power generation of photovoltaic power stations, there is a lack of comprehensive consideration of factors such as the temperature and dust coverage rate of photovoltaic panels during actual operation, which has certain limitations. At the same time, in the process of grid-connected operation of energy storage systems, there is a lack of effective identification of the status of energy storage systems, which cannot enable staff to achieve visual management of the grid-connected operation of photovoltaic energy storage. Summary of the invention

[0005] The purpose of the present invention is to provide a photovoltaic energy storage grid-connected operation control method and system. In the process of comparing the load power and the output power of the photovoltaic power station, the present invention processes the dust coverage rate and the use temperature of the photovoltaic panels during the use process of the output power of the photovoltaic power station, so that the output power of the photovoltaic power station is more accurate and the comparison with the load power is more accurate, so that the power generation of the photovoltaic power station and the use status of the load end can be accurately identified.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A photovoltaic energy storage grid-connected operation control method comprises the following steps:

[0008] Obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, and obtain the energy storage system status signal;

[0009] Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal;

[0010] Based on the energy storage system status signal, the operating status data of the energy storage system is acquired, the operating status value of the energy storage system is obtained, and the energy storage system status is identified according to the operating status value of the energy storage system.

[0011] As a further solution of the present invention: obtaining the load-end electric energy corresponding to the photovoltaic power station and the transmission loss electric energy from the photovoltaic power station to the load end on the transmission line every day;

[0012] The load energy is obtained by summing the load end energy and transmission loss energy on all transmission lines.

[0013] As a further solution of the present invention: the process of obtaining the output electric energy of the photovoltaic power station is as follows:

[0014] Obtain the total area of ​​photovoltaic panels of the photovoltaic power station within a preset period, recorded as Gs i;

[0015] Divide the time period of the photovoltaic power station being illuminated every day within a preset period into a number of time sub-units, and obtain the light intensity at the middle moment of each time sub-unit respectively;

[0016] The light intensity of each time sub-unit in the same day is summed and averaged to obtain the average light intensity of the day, which is recorded as Ge i;

[0017] Get the preset daily light duration, recorded as Gt i;

[0018] The daily sunshine duration is the difference between the time when the sun rises and the time when it sets.

[0019] That is, through the formula The output electric energy GE of the photovoltaic power station within a preset period is calculated, wherein k is a preset correction coefficient, and i=1, 2, ..., i, where i is the number of days within the preset period.

[0020] As a further solution of the present invention: the process of obtaining the preset correction coefficient is:

[0021] Divide the total area of ​​the photovoltaic panels of the photovoltaic power station into a number of area sub-units;

[0022] The dust on the photovoltaic panel in the area sub-unit is collected to obtain the dust mass, and then the dust coverage rate is calculated by comparing the dust mass with the area value of the area sub-unit;

[0023] The dust coverage factor is obtained by summing up the dust coverage rates of all area sub-units and taking the average value;

[0024] Get the temperature value at the middle moment of each time subunit, sum and average the temperature values ​​of each time subunit in the same day, and record it as Wt i, where i is the number of days in the preset period;

[0025] By formula The preset interference coefficient k is calculated, where Hi is the dust coverage factor.

[0026] As a further solution of the present invention: performing difference processing on the output electric energy of the photovoltaic power station and the load electric energy to obtain the photovoltaic electric energy difference;

[0027] comparing the photovoltaic power difference with a photovoltaic power difference threshold;

[0028] If the photovoltaic power difference is greater than or equal to the photovoltaic power difference threshold, a charging signal for the energy storage system is generated;

[0029] If the photovoltaic power difference is less than the photovoltaic power difference threshold, a power generation signal of the energy storage system is generated.

[0030] As a further solution of the present invention: the operating status data of the energy storage system includes current operating abnormal values, sound operating abnormal values ​​and temperature change abnormal values;

[0031] The current operating abnormal value is recorded as Cd;

[0032] The sound running analysis value is recorded as Cs;

[0033] The temperature change value is recorded as Cw;

[0034] By formula The energy storage system operation state value Ci is calculated, where d1, d2, and d3 are all preset proportional coefficients, and are all greater than zero;

[0035] Preset the energy storage system operation state threshold ci, and compare the energy storage system operation state value Ci with the energy storage system operation state threshold ci;

[0036] If the energy storage system operation state value Ci≥the energy storage system operation state threshold ci, it means that the energy storage system operation state is abnormal, and an energy storage system operation abnormality signal is obtained;

[0037] If the energy storage system operation state value Ci<energy storage system operation state threshold ci, it means that the energy storage system operation state is normal, and an energy storage system normal operation signal is obtained.

[0038] As a further solution of the present invention: the process of obtaining the current running abnormal value is:

[0039] The real-time current of the energy storage system during operation is acquired, and a plane coordinate system is established, with time as the X-axis and the real-time current of the energy storage system during operation as the Y-axis, and a real-time current curve of the energy storage system during operation is constructed in the plane coordinate system;

[0040] In the plane coordinate system, the rated current range is used as the upper limit line and the lower limit line to divide the real-time current curve into an over-boundary area and a stable area;

[0041] The current deviation ratio of the cross-boundary area is multiplied by the current time deviation ratio of the cross-boundary area to obtain the current operation anomaly.

[0042] As a further solution of the present invention: the total duration of the cross-boundary area is divided into a plurality of cross-boundary area time units, and the sound in the cross-boundary area time units is processed to obtain the cross-boundary area sound value;

[0043] The total duration of the stable region is divided into a number of stable region time units, and the sound in the stable region time units is processed to obtain a stable region sound value;

[0044] The sound operation analysis value is obtained by taking the ratio of the sound value in the out-of-bounds area to the sound value in the stable area.

[0045] As a further solution of the present invention: obtaining the maximum temperature within each cross-boundary area time unit;

[0046] The maximum temperature values ​​in multiple time units of the cross-boundary area are summed and averaged to obtain the temperature value of the cross-boundary area;

[0047] Get the maximum temperature in each stable area time unit;

[0048] The maximum temperature values ​​in multiple stable area time units are summed and averaged to obtain the stable area temperature value;

[0049] The temperature value of the cross-boundary area is calculated by ratio with the temperature value of the stable area to obtain the temperature change anomaly.

[0050] As a further solution of the present invention: a photovoltaic energy storage grid-connected operation control system, comprising:

[0051] Photovoltaic analysis module: The photovoltaic analysis module is used to obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, obtain the energy storage system status signal, and send the energy storage system status signal to the cloud management and control platform;

[0052] Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal;

[0053] The energy storage analysis module receives the energy storage system status signal transmitted by the cloud management and control platform, obtains the operating status data of the energy storage system, obtains the operating status value of the energy storage system, and completes the energy storage system status identification according to the operating status value of the energy storage system.

[0054] Beneficial effects of the present invention:

[0055] (1) In the process of comparing the load power and the output power of the photovoltaic power station, the present invention processes the dust coverage rate and the use temperature of the photovoltaic panels during the use process of obtaining the output power of the photovoltaic power station, so that the output power of the photovoltaic power station obtained is more accurate, and the comparison with the load power is more accurate, so that the power generation of the photovoltaic power station and the use status of the load end can be accurately identified;

[0056] (2) During the operation of the energy storage system (charging or discharging the energy storage system), the present invention identifies the current stability of the energy storage system, establishes a real-time current curve according to the real-time current of the energy storage system during operation, obtains the cross-border area and the stable area of ​​the current during the operation of the energy storage system by identifying the real-time current curve, obtains the operation status data of the energy storage system based on the cross-border area and the stable area of ​​the current during operation, processes the operation status data of the energy storage system to obtain the operation status value of the energy storage system, completes the evaluation of the operation status of the energy storage system according to the operation status value of the energy storage system, and completes the visual management of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] Figure 1 It is a flow chart of a photovoltaic energy storage grid-connected operation control method according to an embodiment of the present invention;

[0059] Figure 2 It is a flow chart of energy storage system status signal recognition in a photovoltaic energy storage grid-connected operation control method according to an embodiment of the present invention;

[0060] Figure 3 It is a flowchart of a photovoltaic energy storage grid-connected operation control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] 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.

[0062] Example 1

[0063] See also Figure 1-Figure 2 As shown, the present invention is a photovoltaic energy storage grid-connected operation control method, comprising the following steps:

[0064] Obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, and obtain the energy storage system status signal;

[0065] Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal;

[0066] Based on the energy storage system status signal, the operating status data of the energy storage system is acquired, the operating status value of the energy storage system is obtained, and the energy storage system status is identified according to the operating status value of the energy storage system.

[0067] The load electric energy includes the load-end electric energy corresponding to the photovoltaic power station and the transmission loss electric energy from the photovoltaic power station to the load end;

[0068] The process of obtaining electric energy at the load end is:

[0069] In a preset cycle, the input current and input voltage of the load end are obtained, the input current and input voltage of the load end when the load end is running are multiplied and integrated for the preset cycle time to obtain the load end electric energy of the load terminal in the cycle;

[0070] The process of obtaining transmission loss electric energy is as follows:

[0071] By the formula E = I 2 *R*t is the transmission loss of electric energy E in the transmission line, where I is the current, R is the resistance of the wire, and t is the transmission time (preset cycle length);

[0072] Add the load-end power and transmission loss power of each transmission line to obtain the total power consumption of a single load end;

[0073] The total power consumption at the load end of all transmission lines corresponding to the photovoltaic power station is summed to obtain the load power.

[0074] The process of obtaining the output power of a photovoltaic power station is as follows:

[0075] Obtain the total area of ​​photovoltaic panels of the photovoltaic power station within a preset period, recorded as Gs i;

[0076] Divide the time period of the photovoltaic power station being illuminated every day within a preset period into a number of time sub-units, and obtain the light intensity at the middle moment of each time sub-unit respectively;

[0077] The light intensity of each time sub-unit in the same day is summed and averaged to obtain the average light intensity of the day, which is recorded as Ge i;

[0078] Get the preset daily light duration, recorded as Gt i;

[0079] The daily sunshine duration is the difference between the time when the sun rises and the time when it sets.

[0080] That is, through the formula The output electric energy GE of the photovoltaic power station within a preset period is calculated, wherein k is a preset correction coefficient, i=1, 2, ..., i; wherein i is the number of days within the preset period.

[0081] Among them, the process of obtaining the preset correction coefficient is:

[0082] Divide the total area of ​​the photovoltaic panels of the photovoltaic power station into a number of area sub-units;

[0083] The dust on the photovoltaic panel in the area sub-unit is collected to obtain the dust mass, and then the dust coverage rate is calculated by comparing the dust mass with the area value of the area sub-unit;

[0084] The dust coverage factor is obtained by summing up the dust coverage rates of all area sub-units and taking the average value;

[0085] Get the temperature value at the middle moment of each time subunit, sum and average the temperature values ​​of each time subunit in the same day, and record it as Wt i, where i is the number of days in the preset period;

[0086] By formula The preset interference coefficient k is calculated, where Hi is the dust coverage factor;

[0087] Through the above formula for calculating the preset correction coefficient, it can be known that within the preset period, the closer the daily temperature average is to 25°C, the larger the preset correction coefficient is, and the larger the output power of the photovoltaic power station within the corresponding preset period is; the larger the dust coverage factor is, the lower the light absorption rate of the photovoltaic panel is, and the smaller the preset correction coefficient is, and the smaller the output power of the photovoltaic power station within the corresponding preset period is.

[0088] The output power of the photovoltaic power station and the load power are processed to obtain the photovoltaic power difference;

[0089] comparing the photovoltaic power difference with a photovoltaic power difference threshold;

[0090] If the photovoltaic power difference is greater than or equal to the photovoltaic power difference threshold, a charging signal for the energy storage system is generated;

[0091] If the photovoltaic power difference is less than the photovoltaic power difference threshold, a power generation signal of the energy storage system is generated;

[0092] It should be noted that: the energy storage system charging signal indicates that the photovoltaic power station has a large amount of power generation within the preset period, and after the power generation provides the required power at the load end, there is still surplus power for charging the energy storage system; the energy storage system power generation signal indicates that the photovoltaic power station has a small amount of power generation within the preset period, and the power generation cannot meet the required power at the load end, and the energy storage system is required to generate power to ensure the stable operation of the load end.

[0093] The operating status data of the energy storage system includes current operating abnormal values, sound operating abnormal values ​​and temperature change abnormal values;

[0094] Among them, the process of obtaining the current running outlier value is:

[0095] The real-time current of the energy storage system during operation is acquired, and a plane coordinate system is established, with time as the X-axis and the real-time current of the energy storage system during operation as the Y-axis, and a real-time current curve of the energy storage system during operation is constructed in the plane coordinate system;

[0096] Obtain the rated current range value when the energy storage system is running, and record the upper limit value of the rated current range value as the upper limit current value;

[0097] The lower limit value of the current rated range is recorded as the lower limit current value;

[0098] Draw a horizontal line parallel to the X-axis in the plane coordinate system at the upper limit current value, which is recorded as the upper limit directrix;

[0099] Draw a horizontal line parallel to the X-axis in the plane coordinate system at the lower limit current value, which is recorded as the lower limit directrix;

[0100] Analyze the real-time current curve and the upper limit line and the lower limit line;

[0101] The area where the real-time current curve is above the upper limit criterion is recorded as the upper over-boundary area;

[0102] The area where the real-time current curve is below the lower limit line is recorded as the lower over-limit area;

[0103] The upper out-of-bounds area and the lower out-of-bounds area are recorded as out-of-bounds areas;

[0104] The area between the upper limit line and the lower limit line of the real-time current curve is recorded as a stable area;

[0105] The maximum current value and the minimum current value in the cross-boundary area are obtained, and the difference between the maximum current value and the minimum current value in the cross-boundary area is calculated to obtain the current deviation value of the cross-boundary area;

[0106] The current deviation value of the cross-boundary area is calculated by ratio with the middle value of the current rated range value to obtain the current deviation ratio of the cross-boundary area;

[0107] Obtain the total duration of the cross-boundary area, calculate the ratio of the total duration of the cross-boundary area to the operating time of the energy storage system, and obtain the current time deviation ratio of the cross-boundary area;

[0108] The current deviation ratio of the cross-boundary area is multiplied by the current time deviation ratio of the cross-boundary area to obtain the current operation abnormal value;

[0109] The total duration of the cross-boundary area is divided into a number of cross-boundary area time units, and the maximum value of the sound in each cross-boundary area time unit is obtained;

[0110] The maximum values ​​of the sounds in multiple time units of the cross-boundary area are summed and averaged to obtain the sound value of the cross-boundary area;

[0111] The total duration of the stable area is divided into a number of stable area time units, and the maximum value of the sound in each stable area time unit is obtained;

[0112] The maximum sound values ​​in multiple stable area time units are summed and averaged to obtain the stable area sound value;

[0113] Obtain the ratio of the sound value in the out-of-bounds area to the sound value in the stable area to obtain the sound operation analysis value;

[0114] Get the maximum temperature within each time unit of the cross-boundary area;

[0115] The maximum temperature values ​​in multiple time units of the cross-boundary area are summed and averaged to obtain the temperature value of the cross-boundary area;

[0116] Get the maximum temperature in each stable area time unit;

[0117] The maximum temperature values ​​in multiple stable area time units are summed and averaged to obtain the stable area temperature value;

[0118] The temperature value of the cross-boundary area is calculated by ratio with the temperature value of the stable area to obtain the temperature change anomaly;

[0119] The current operating abnormal value is recorded as Cd;

[0120] The sound running analysis value is recorded as Cs;

[0121] The temperature change value is recorded as Cw;

[0122] By formula The energy storage system operation state value Ci is calculated, where d1, d2, and d3 are all preset proportional coefficients, and are all greater than zero;

[0123] Preset the energy storage system operation state threshold ci, and compare the energy storage system operation state value Ci with the energy storage system operation state threshold ci;

[0124] If the energy storage system operation state value Ci≥the energy storage system operation state threshold ci, it means that the energy storage system operation state is abnormal, and an energy storage system operation abnormality signal is obtained;

[0125] If the energy storage system operation state value Ci<energy storage system operation state threshold ci, it means that the energy storage system operation state is normal, and an energy storage system normal operation signal is obtained.

[0126] Among them, based on the abnormal operation signal of the energy storage system, the ratio of the energy storage system operation status value Ci to the energy storage system operation status threshold ci is obtained. If the obtained ratio is larger, it means that the abnormality of the energy storage power supply is more serious, so that the staff can carry out targeted processing of the abnormal state of the energy storage system, which is convenient for the staff to visually manage the energy storage system.

[0127] Example 2

[0128] See also Figure 3 As shown, the present invention is a photovoltaic energy storage grid-connected operation control system, including a photovoltaic analysis module, an energy storage analysis module and a cloud management and control platform;

[0129] The photovoltaic analysis module and the energy storage analysis module are electrically connected to the cloud management and control platform;

[0130] The photovoltaic analysis module is used to obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, obtain the energy storage system status signal, and send the energy storage system status signal to the cloud management and control platform;

[0131] Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal;

[0132] The energy storage analysis module receives the energy storage system status signal transmitted by the cloud management and control platform, obtains the operating status data of the energy storage system, obtains the operating status value of the energy storage system, and completes the energy storage system status identification according to the operating status value of the energy storage system.

[0133] One of the core points of the present invention is that in the process of comparing the load power and the output power of the photovoltaic power station, the present invention processes the dust coverage rate and the use temperature of the photovoltaic panels during the use process of the output power of the photovoltaic power station, so that the output power of the photovoltaic power station obtained is more accurate, and the comparison with the load power is more accurate, so that the power generation of the photovoltaic power station and the use status of the load end can be accurately identified, so that the staff can more accurately grasp the working status of the energy storage system;

[0134] One of the core points of the present invention is: during the operation of the energy storage system (charging the energy storage system or discharging the energy storage system), the current stability of the energy storage system is identified, and a real-time current curve is established according to the real-time current of the energy storage system during operation. The cross-border area and the stable area of ​​the current operation during the operation of the energy storage system are obtained by identifying the real-time current curve. Based on the cross-border area and the stable area of ​​the current operation, the operation status data of the energy storage system (current operation anomalies, sound operation analysis values ​​and temperature change anomalies) are obtained, the operation status data of the energy storage system is processed to obtain the operation status value of the energy storage system, and the operation status of the energy storage system is evaluated according to the operation status value of the energy storage system, so as to complete the visual management of the energy storage system.

[0135] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A photovoltaic energy storage grid-connected operation control method, characterized in that: The following steps are involved: Obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, and obtain the energy storage system status signal; Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal; Based on the energy storage system status signal, the operating status data of the energy storage system is obtained to obtain the operating status value of the energy storage system, and the energy storage system status is identified according to the operating status value of the energy storage system; The process of obtaining the output power of a photovoltaic power station is as follows: Obtain the total area of ​​photovoltaic panels of the photovoltaic power station within a preset period, recorded as Gs i; Divide the time period of the photovoltaic power station being illuminated every day within a preset period into a number of time sub-units, and obtain the light intensity at the middle moment of each time sub-unit respectively; The light intensity of each time sub-unit in the same day is summed and averaged to obtain the average light intensity of the day, which is recorded as Ge i; Get the preset daily light duration, recorded as Gt i; The daily sunshine duration is the difference between the time when the sun rises and the time when it sets. That is, through the formula The output electric energy GE of the photovoltaic power station within a preset period is calculated, wherein k is a preset correction coefficient, i=1, 2, ..., i, and i is the number of days within the preset period; The process of obtaining the preset correction coefficient is as follows: Divide the total area of ​​the photovoltaic panels of the photovoltaic power station into a number of area sub-units; The dust on the photovoltaic panel in the area sub-unit is collected to obtain the dust mass, and then the dust coverage rate is calculated by comparing the dust mass with the area value of the area sub-unit; The dust coverage factor is obtained by summing up the dust coverage rates of all area sub-units and taking the average value; Get the temperature value at the middle moment of each time subunit, sum and average the temperature values ​​of each time subunit in the same day, and record it as Wt i, where i is the number of days in the preset period; By formula The preset interference coefficient k is calculated, where Hi is the dust coverage factor.

2. A photovoltaic energy storage grid-connected operation control method according to claim 1, characterized in that: Obtain the load-side electric energy corresponding to the photovoltaic power station and the transmission loss electric energy from the photovoltaic power station to the load side on the transmission line every day; The load energy is obtained by summing the load end energy and transmission loss energy on all transmission lines.

3. A photovoltaic energy storage grid-connected operation control method according to claim 1, characterized in that: The output power of the photovoltaic power station and the load power are processed to obtain the photovoltaic power difference; comparing the photovoltaic power difference with a photovoltaic power difference threshold; If the photovoltaic power difference is greater than or equal to the photovoltaic power difference threshold, a charging signal for the energy storage system is generated; If the photovoltaic power difference is less than the photovoltaic power difference threshold, a power generation signal of the energy storage system is generated.

4. A photovoltaic energy storage grid-connected operation control method according to claim 1, characterized in that: The operating status data of the energy storage system includes current operating abnormal values, sound operating abnormal values ​​and temperature change abnormal values; The current operating abnormal value is recorded as Cd; The sound running analysis value is recorded as Cs; The temperature change value is recorded as Cw; By formula The energy storage system operation state value Ci is calculated, where d1, d2, and d3 are all preset proportional coefficients, and are all greater than zero; Preset the energy storage system operation state threshold ci, and compare the energy storage system operation state value Ci with the energy storage system operation state threshold ci; If the energy storage system operation state value Ci≥the energy storage system operation state threshold ci, it means that the energy storage system operation state is abnormal, and an energy storage system operation abnormality signal is obtained; If the energy storage system operation state value Ci<energy storage system operation state threshold ci, it means that the energy storage system operation state is normal, and an energy storage system normal operation signal is obtained.

5. A photovoltaic energy storage grid-connected operation control method according to claim 4, characterized in that: The process of obtaining the current running abnormal value is: The real-time current of the energy storage system during operation is acquired, and a plane coordinate system is established, with time as the X-axis and the real-time current of the energy storage system during operation as the Y-axis, and a real-time current curve of the energy storage system during operation is constructed in the plane coordinate system; In the plane coordinate system, the rated current range is used as the upper limit line and the lower limit line to divide the real-time current curve into an over-boundary area and a stable area; The current deviation ratio of the cross-boundary area is multiplied by the current time deviation ratio of the cross-boundary area to obtain the current operation anomaly.

6. A photovoltaic energy storage grid-connected operation control method according to claim 5, characterized in that: The total duration of the cross-boundary area is divided into a number of cross-boundary area time units, and the sound in the cross-boundary area time units is processed to obtain the cross-boundary area sound value; The total duration of the stable region is divided into a number of stable region time units, and the sound in the stable region time units is processed to obtain a stable region sound value; The sound operation analysis value is obtained by taking the ratio of the sound value in the out-of-bounds area to the sound value in the stable area.

7. A photovoltaic energy storage grid-connected operation control method according to claim 6, characterized in that: Get the maximum temperature within each time unit of the cross-boundary area; The maximum temperature values ​​in multiple time units of the cross-boundary area are summed and averaged to obtain the temperature value of the cross-boundary area; Get the maximum temperature in each stable area time unit; The maximum temperature values ​​in multiple stable area time units are summed and averaged to obtain the stable area temperature value; The temperature value of the cross-boundary area is calculated by ratio with the temperature value of the stable area to obtain the temperature change anomaly.

8. A photovoltaic energy storage grid-connected operation control system, characterized in that: include: Photovoltaic analysis module: The photovoltaic analysis module is used to obtain the load power corresponding to the photovoltaic power station, compare the load power with the output power of the photovoltaic power station, obtain the energy storage system status signal, and send the energy storage system status signal to the cloud management and control platform; Among them, the energy storage system status signal includes the energy storage system power generation signal and the energy storage system charging signal; Energy storage analysis module, the energy storage analysis module receives the energy storage system status signal transmitted by the cloud management and control platform, obtains the operation status data of the energy storage system, obtains the operation status value of the energy storage system, and completes the energy storage system status identification according to the operation status value of the energy storage system; The process of obtaining the output power of a photovoltaic power station is as follows: Obtain the total area of ​​photovoltaic panels of the photovoltaic power station within a preset period, recorded as Gs i; Divide the time period of the photovoltaic power station being illuminated every day within a preset period into a number of time sub-units, and obtain the light intensity at the middle moment of each time sub-unit respectively; The light intensity of each time sub-unit in the same day is summed and averaged to obtain the average light intensity of the day, which is recorded as Ge i; Get the preset daily light duration, recorded as Gt i; The daily sunshine duration is the difference between the time when the sun rises and the time when it sets. That is, through the formula The output electric energy GE of the photovoltaic power station within a preset period is calculated, wherein k is a preset correction coefficient, i=1, 2, ..., i, and i is the number of days within the preset period; The process of obtaining the preset correction coefficient is as follows: Divide the total area of ​​the photovoltaic panels of the photovoltaic power station into a number of area sub-units; The dust on the photovoltaic panel in the area sub-unit is collected to obtain the dust mass, and then the dust coverage rate is calculated by comparing the dust mass with the area value of the area sub-unit; The dust coverage factor is obtained by summing up the dust coverage rates of all area sub-units and taking the average value; Get the temperature value at the middle moment of each time subunit, sum and average the temperature values ​​of each time subunit in the same day, record it as Wti, i is the number of days in the preset period; By formula The preset interference coefficient k is calculated, where Hi is the dust coverage factor.

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