Network construction type energy storage power balance control method and system

Abstract

The invention belongs to the technical field of network construction type energy storage power balance, and particularly relates to a network construction type energy storage power balance control method and system. By acquiring multi-dimensional information such as power demand, voltage change, load prediction and voltage fluctuation of the power grid in real time, a charging and discharging strategy of the energy storage system can be adjusted in time, fluctuation of the power grid is effectively relieved, voltage instability is reduced, stability of the power grid is enhanced, and by monitoring the voltage fluctuation and power demand of the power grid in real time, energy consumption is reduced. And the fluctuation demand of the power grid can be quickly responded by combining the frequency change of the power grid, and the energy storage system can be charged or discharged at a proper time by scientifically predicting the load change, so that overcharge or overdischarge is avoided, and the overall operation efficiency of the energy storage system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of grid-type energy storage power balance, and specifically relates to a grid-type energy storage power balance control method and system. Background Art

[0002] With the continuous increase in global energy demand and the large-scale access to renewable energy (such as wind power, solar energy, etc.), the stability and reliability of the power system are facing severe challenges. The intermittent and volatile characteristics of renewable energy lead to uncertainty in power supply, which puts tremendous pressure on the power balance control of the power grid. To cope with this problem, energy storage technology has gradually become one of the important means to ensure the stable operation of the power grid.

[0003] Grid-connected energy storage systems play a vital role in modern power networks. They are mainly used to balance power supply and demand and improve the reliability and stability of power systems. With the widespread application of renewable energy, power fluctuations in power grids are becoming more and more frequent, which places higher demands on the power balancing capabilities of energy storage systems. Grid-connected energy storage systems can effectively store excess electricity and release the stored electricity during peak periods of power demand to balance power supply and demand. However, as the operating time of energy storage systems increases, the problem of power instability gradually emerges, mainly manifested as abnormal fluctuations in power output or input, which not only affects the stability of the power system, but may also cause performance degradation or damage to energy storage equipment.

[0004] In practical applications, power anomaly problems usually need to be detected in a timely manner and effectively regulated. Although existing technologies have made certain progress in power monitoring and anomaly detection, there are still some deficiencies in dynamic adjustment and compensation. For example, existing methods cannot effectively make real-time dynamic adjustments to power fluctuations. In addition, traditional regulation methods often rely on simple threshold settings and fail to fully consider the time characteristics of power fluctuations and the impact of historical data, resulting in poor regulation effects. Summary of the invention

[0005] The purpose of the present invention is to provide a grid-type energy storage power balance control method that can effectively cope with the impact of power fluctuations, ensure that the energy storage system maintains optimal performance under various operating conditions, and enhance the overall reliability and safety of the power system.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A grid-type energy storage power balance control method, comprising:

[0008] Obtain power demand information of the power grid;

[0009] Obtaining voltage change information corresponding to the power grid within a first preset time period;

[0010] Obtaining output power adjustment information according to power demand information and voltage change information;

[0011] Obtaining grid load data within a second preset time period, and obtaining grid load forecast change information based on the grid load data;

[0012] Obtain the current grid frequency information, and obtain the charging and discharging strategy of the grid-connected energy storage system based on the output power adjustment information, grid load forecast change information, and the current grid frequency information;

[0013] Acquiring voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid;

[0014] The output power of the grid-type energy storage system is adjusted according to the charging and discharging strategy, voltage fluctuation information and current voltage.

[0015] In a preferred solution, the step of obtaining voltage change information corresponding to the power grid within the first preset time period includes:

[0016] Acquire multiple voltage values ​​of the power grid within a first preset time period;

[0017] Obtaining a voltage change value according to a plurality of voltage values;

[0018] Determine whether the voltage change value is within a preset range;

[0019] If the voltage change value is within the preset range, the voltage change information corresponding to the power grid is stable;

[0020] If the voltage change value is not within the preset interval and is greater than the upper limit value within the preset interval, the voltage change information corresponding to the power grid is increasing;

[0021] If the voltage change value is not within the preset interval and is less than the lower limit value within the preset interval, the voltage change information corresponding to the power grid is decreasing.

[0022] In a preferred embodiment, the step of obtaining a plurality of voltage values ​​of the power grid within the first preset time period includes:

[0023] Marking the time of obtaining the power demand information of the power grid as the end time;

[0024] Obtain power threshold, standard duration, and standard duration power requirement ratio;

[0025] Acquire a corresponding power demand value according to the power demand information;

[0026] The first preset duration is calculated according to the power requirement value, the power threshold, the standard duration, and the standard duration power requirement ratio requirement, wherein the calculation formula is:

[0027]

[0028] Where, T d Represented as the first preset duration, W y Expressed as power demand value, W b It is represented as power threshold, B is represented as standard time power requirement ratio, T b Expressed as standard duration;

[0029] Obtaining a start time according to the first preset duration and the end time;

[0030] Obtain a first preset time period according to the start time and the end time;

[0031] A plurality of voltage values ​​of the power grid at different times within a first preset time period are collected.

[0032] In a preferred solution, the step of acquiring output power adjustment information according to power demand information and voltage change information includes:

[0033] Acquire a corresponding power demand value according to the power demand information;

[0034] Acquire a corresponding voltage change value according to the voltage change information;

[0035] Obtaining a power demand adjustment value according to the power demand value and the voltage change value;

[0036] Obtain a power adjustment table, wherein the power adjustment table includes a plurality of power demand adjustment interval values ​​and output power adjustment information corresponding to each power demand adjustment interval value;

[0037] Obtaining a target power demand adjustment interval value according to the power demand adjustment value;

[0038] According to the target power demand adjustment interval value, the corresponding output power adjustment information is obtained from the power adjustment table.

[0039] In a preferred solution, the step of obtaining power grid load data within the second preset time period and obtaining power grid load forecast change information according to the power grid load data includes:

[0040] Obtaining power grid load data within a second preset time period;

[0041] Acquire corresponding multiple power grid load values ​​according to power grid load data;

[0042] The grid load change value is calculated based on multiple grid load values, where the calculation formula is:

[0043]

[0044] In the formula, F represents the grid load change value, i represents the number of multiple grid load values, where i = 2, 3...n, D i Denotes the i-th grid load value, D i-1 It is represented as the i-1th grid load value;

[0045] Marking the end time of the second preset time period as the start time of the prediction time period, obtaining the prediction duration, obtaining the end time of the prediction time period according to the prediction duration and the start time of the prediction time period, and constructing the prediction time period according to the start time of the prediction time period and the end time of the prediction time period;

[0046] Obtain the power grid load assessment interval value corresponding to the forecast period;

[0047] Determine whether the grid load change value is within the grid load assessment interval value;

[0048] If the grid load change value is within the grid load assessment interval, the grid load forecast change information within the forecast period is stable;

[0049] If the grid load change value is not within the grid load assessment interval value and is greater than the upper limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is increasing;

[0050] If the grid load change value is not within the grid load assessment interval value and is less than the lower limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is decreasing.

[0051] In a preferred embodiment, the step of obtaining the current grid frequency information and obtaining the charging and discharging strategy of the grid-connected energy storage system according to the output power adjustment information, the grid load forecast change information and the current grid frequency information includes:

[0052] Obtain current grid frequency information, and obtain corresponding grid frequency weight according to the current grid frequency information;

[0053] Acquire a corresponding power demand value according to the output power adjustment information;

[0054] Obtain corresponding grid load change value according to grid load forecast change information;

[0055] Obtaining a strategy value according to a power demand value, a grid load change value, and a grid frequency weight;

[0056] Obtain a strategy table, the strategy table including multiple strategy interval values ​​and a charging and discharging strategy corresponding to each strategy interval value;

[0057] Obtain the target strategy interval value according to the strategy value;

[0058] The corresponding charging and discharging strategy of the grid-connected energy storage system is obtained from the strategy table according to the target strategy interval value.

[0059] In a preferred embodiment, the step of adjusting the output power of the grid-type energy storage system according to the charging and discharging strategy, the voltage fluctuation information and the current voltage includes:

[0060] Obtaining a corresponding voltage adjustment value according to a charge and discharge strategy;

[0061] Acquire a corresponding voltage fluctuation value according to the voltage fluctuation information;

[0062] Obtaining a voltage control value according to a voltage adjustment value, a voltage fluctuation value and a current voltage;

[0063] The output power of the grid-connected energy storage system is adjusted according to the voltage control value.

[0064] In a preferred embodiment, after the step of adjusting the output power of the grid-type energy storage system according to the voltage control value, the step further includes:

[0065] Obtain the power data of the grid-connected energy storage system after regulation and mark it as post-regulation power data;

[0066] Obtaining a corresponding post-control power value according to the post-control power data;

[0067] Get the power in the standard post-control interval;

[0068] Determine whether the post-control power value is within the standard post-control interval power;

[0069] If the post-control power value is within the standard post-control interval power, the post-control power is determined to be normal;

[0070] If the post-control power value is not within the standard post-control interval power and is greater than the maximum value of the standard post-control interval power, it is determined that the post-control power is abnormal, and the power of the grid-type energy storage system after control is high, and the power demand information of the grid-type energy storage system after control is obtained, and the power demand information after control is marked, and the power demand information after control is returned as the power demand information to the step of obtaining the power demand information of the power grid;

[0071] If the power value after control is not within the standard power after control interval and is less than the minimum power value of the standard power after control interval, it is determined that the power after control is abnormal and the power of the grid-connected energy storage system after control is low. The power demand information of the grid-connected energy storage system after control is obtained, and the power demand information after control is marked. The power demand information after control is returned as power demand information to the step of obtaining the power demand information of the power grid.

[0072] The present invention also provides a grid-type energy storage power balance control system, which is used for the above-mentioned grid-type energy storage power balance control method, comprising:

[0073] A power demand module is used to obtain power demand information of the power grid;

[0074] A voltage change module, used to obtain voltage change information corresponding to the power grid within a first preset time period;

[0075] A power adjustment module, used to obtain output power adjustment information according to power demand information and voltage change information;

[0076] A power grid load module, used to obtain power grid load data within a second preset time period, and obtain power grid load forecast change information according to the power grid load data;

[0077] The charging and discharging module is used to obtain the current grid frequency information and obtain the charging and discharging strategy of the grid-type energy storage system according to the output power adjustment information, grid load forecast change information and the current grid frequency information;

[0078] A voltage data module, used to obtain voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid;

[0079] The control module is used to adjust the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and current voltage.

[0080] And, a network-type energy storage power balance control terminal, comprising:

[0081] one or more processors;

[0082] a storage device having one or more programs stored thereon;

[0083] When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type energy storage power balance control method.

[0084] The technical effects achieved by the present invention are:

[0085] The present invention can timely adjust the charging and discharging strategy of the energy storage system by acquiring multi-dimensional information such as power demand, voltage change, load forecast and voltage fluctuation of the power grid in real time, effectively alleviate power grid fluctuation, reduce the occurrence of voltage instability, and enhance the stability of the power grid. By real-time monitoring of the voltage fluctuation and power demand of the power grid and combining the frequency change of the power grid, it can quickly respond to the fluctuating demand of the power grid. By scientifically predicting the load change, the energy storage system can charge or discharge at the appropriate time to avoid overcharging or discharging, thereby improving the overall operation efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 is a flow chart of the method provided by the present invention;

[0087] Figure 2 It is a system module diagram provided by the present invention. DETAILED DESCRIPTION

[0088] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0089] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0090] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0091] Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the schematic diagrams are only examples and should not limit the scope of protection of the present invention.

[0092] Please see attached Figure 1 As shown, a grid-type energy storage power balance control method is provided, comprising:

[0093] S1. Obtain power demand information of the power grid;

[0094] S2. Obtaining voltage change information corresponding to the power grid within a first preset time period;

[0095] S3, obtaining output power adjustment information according to power demand information and voltage change information;

[0096] S4, obtaining grid load data within a second preset time period, and obtaining grid load forecast change information according to the grid load data;

[0097] S5. Obtain the current grid frequency information, and obtain the charging and discharging strategy of the grid-connected energy storage system according to the output power adjustment information, the grid load forecast change information and the current grid frequency information;

[0098] S6. Obtaining voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid;

[0099] S7. Adjust the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and current voltage.

[0100] As in the above steps S1 to S7, the power demand information of the power grid is obtained through real-time monitoring of the power grid, the current load and power supply demand of the power grid are clarified, and the voltage changes of each power grid are obtained within the first preset time period to determine the fluctuation of the power grid voltage and evaluate the stability of the power grid. According to the power demand information and voltage change information of the power grid, it is ensured that the instability caused by voltage fluctuation is avoided while the load of the power grid is met, and a reasonable output power adjustment information is obtained. This step obtains the load data of the power grid within the second preset time period by comprehensively considering the power demand and voltage fluctuation, and predicts the load change of the power grid. After obtaining the current power grid frequency information, a charging and discharging strategy of the energy storage system is formulated based on the power adjustment information, load prediction and power grid frequency, so that it can charge or discharge at the appropriate time and participate in power grid regulation. At the third preset time, The voltage fluctuation of the power grid is further monitored within the section, and combined with the current voltage information, it is ensured that abnormal voltage fluctuations can be monitored in real time. According to the previously formulated charging and discharging strategy, voltage fluctuation information and current voltage, the output power of the energy storage system is dynamically adjusted to ensure the balance and stability of the power grid. By obtaining multi-dimensional information such as the power demand, voltage change, load forecast and voltage fluctuation of the power grid in real time, the charging and discharging strategy of the energy storage system can be adjusted in time, effectively alleviating grid fluctuations, reducing the occurrence of voltage instability, and enhancing the stability of the power grid. By real-time monitoring of the voltage fluctuation and power demand of the power grid, combined with the changes in the grid frequency, it can quickly respond to the fluctuating demand of the power grid. By scientifically predicting load changes, the energy storage system can charge or discharge at the appropriate time to avoid overcharging or discharging, thereby improving the overall operation efficiency of the energy storage system.

[0101] In a preferred embodiment, the step of obtaining voltage change information corresponding to the power grid within the first preset time period includes:

[0102] S201, obtaining multiple voltage values ​​of the power grid within a first preset time period;

[0103] S202, obtaining a voltage change value according to a plurality of voltage values;

[0104] S203, determining whether the voltage change value is within a preset range;

[0105] If the voltage change value is within the preset range, the voltage change information corresponding to the power grid is stable;

[0106] If the voltage change value is not within the preset interval and is greater than the upper limit value within the preset interval, the voltage change information corresponding to the power grid is increasing;

[0107] If the voltage change value is not within the preset interval and is less than the lower limit value within the preset interval, the voltage change information corresponding to the power grid is decreasing.

[0108] As in the above steps S201 to S203, within the first preset time period, voltage data is collected from each node of the power grid, the voltage data at multiple time points are processed, and the voltage value corresponding to each time point is extracted. According to the voltage values ​​at multiple time points, the voltage change value is calculated. The voltage change value can be calculated by finding the difference between the average value of multiple voltage values ​​and the standard voltage, or it can be obtained by other preset algorithms. A reasonable preset interval is set to determine whether the voltage fluctuation is within the normal range. The upper and lower limits of the evaluation interval determine the acceptable range of the voltage fluctuation. If it is within the preset interval, it means that the voltage change amplitude is within the normal range, and the voltage change information is marked as "stable". If the voltage change value exceeds the upper limit of the preset interval, it means that the voltage is rising and marked as "increasing". If the voltage change value is lower than the lower limit of the preset interval, it means that the voltage is decreasing and marked as "decreasing". It can accurately track the real-time fluctuation of the voltage, which helps the power grid operator to quickly grasp the changing trend of the power grid voltage, and can effectively determine whether the voltage fluctuation is within the normal range and make corresponding adjustments or alarms.

[0109] In a preferred embodiment, the step of obtaining multiple voltage values ​​of the power grid within the first preset time period includes:

[0110] S2011, marking the time of obtaining the power demand information of the power grid as the end time;

[0111] S2012, obtaining a power threshold, a standard duration, and a standard duration power requirement ratio;

[0112] S2013. Obtaining a corresponding power demand value according to the power demand information;

[0113] S2014, calculating a first preset duration according to the power requirement value, the power threshold, the standard duration, and the standard duration power requirement ratio requirement, wherein the calculation formula is:

[0114]

[0115] Where, T d Represented as the first preset duration, W y Expressed as power demand value, W b It is represented as power threshold, B is represented as standard time power requirement ratio, T b Expressed as standard duration;

[0116] S2015, obtaining a start time according to the first preset duration and the end time;

[0117] S2016, obtaining a first preset time period according to the start time and the end time;

[0118] S2017. Collect multiple voltage values ​​of the power grid at different times within a first preset time period.

[0119] As in the above steps S2011 to S2017, the time for obtaining the power demand information of the power grid is marked as the end time of the first preset period, and the relevant power threshold (used to define the range of power anomaly), standard time (as a reference length of the time period) and standard time power demand ratio are further obtained, where |W y -W b | is expressed as the deviation between the power demand value and the power threshold. The difference is normalized by the standard duration power demand ratio B, and the power deviation is scaled to a suitable range to adapt to the duration calculation. The normalized result is compared with the standard duration T b Multiply them to get the first duration T that meets the power deviation d , standard duration T b A basic duration is provided, and a suitable first preset duration is calculated. This duration is used to define the length of the time period. According to the determined first preset duration and end time, the corresponding start time is deduced, and a complete first preset time period is constructed using the calculated start time and the previously marked end time. This time period covers the operating conditions between obtaining power demand information. During this first time period, all power grid voltage data are collected. These data will be used for subsequent voltage change calculations to provide more detailed voltage change information, making the first preset time period more targeted and avoiding the analysis blind spots that may be caused by fixed time period lengths.

[0120] In a preferred embodiment, the step of acquiring output power adjustment information according to power demand information and voltage change information includes:

[0121] S301, obtaining a corresponding power demand value according to power demand information;

[0122] S302, acquiring a corresponding voltage change value according to the voltage change information;

[0123] S303, obtaining a power demand adjustment value according to the power demand value and the voltage change value;

[0124] S304, obtaining a power adjustment table, wherein the power adjustment table includes a plurality of power demand adjustment interval values ​​and output power adjustment information corresponding to each power demand adjustment interval value;

[0125] S305, obtaining a target power demand adjustment interval value according to the power demand adjustment value;

[0126] S306: Acquire corresponding output power adjustment information from the power adjustment table according to the target power demand adjustment interval value.

[0127] As in the above steps S301 to S306, the power demand value required by the power grid at the current moment is calculated based on the current power demand information of the power grid. This is the actual power demand obtained based on factors such as the power grid load situation and user demand. By monitoring the voltage change information, the voltage change value of the power grid is extracted. According to the power demand value and the voltage change value of the power grid, a power demand adjustment value is comprehensively calculated. The calculation formula is Z=G*Q, where Z represents the power demand adjustment value, G represents the power demand value, and Q represents the voltage change value. A plurality of power demand adjustment interval values ​​are preset in the power adjustment table, and each interval corresponds to different output power adjustment information. The power adjustment The purpose of the whole table is to quickly match the corresponding output power adjustment strategy according to different power demand adjustment values. According to the previously calculated power demand adjustment value, the corresponding target power demand adjustment interval value is selected from the power adjustment table. According to the target power demand adjustment interval value, the corresponding output power adjustment information is obtained from the power adjustment table. These adjustment information will guide the energy storage system on how to adjust its output power to meet the needs of the power grid and maintain the stability of the power grid. By comprehensively considering the voltage change information, the power output can be better balanced, thereby reducing the instability of the power grid caused by voltage fluctuations. Accurate adjustment of power output helps to maintain the voltage stability of the power grid.

[0128] In a preferred embodiment, the step of obtaining the grid load data within the second preset time period and obtaining the grid load forecast change information according to the grid load data includes:

[0129] S401, obtaining power grid load data within a second preset time period;

[0130] S402, acquiring corresponding multiple power grid load values ​​according to the power grid load data;

[0131] S403, calculating a grid load change value according to multiple grid load values, wherein the calculation formula is:

[0132]

[0133] In the formula, F represents the grid load change value, i represents the number of multiple grid load values, where i = 2, 3...n, D i Denotes the i-th grid load value, D i-1 It is represented as the i-1th grid load value;

[0134] S404, marking the end time of the second preset time period as the start time of the prediction time period, obtaining the prediction duration, obtaining the end time of the prediction time period according to the prediction duration and the start time of the prediction time period, and constructing the prediction time period according to the start time of the prediction time period and the end time of the prediction time period;

[0135] S405, obtaining a power grid load assessment interval value corresponding to the forecast period;

[0136] S406, determining whether the grid load change value is within the grid load assessment interval value;

[0137] If the grid load change value is within the grid load assessment interval, the grid load forecast change information within the forecast period is stable;

[0138] If the grid load change value is not within the grid load assessment interval value and is greater than the upper limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is increasing;

[0139] If the grid load change value is not within the grid load assessment interval value and is less than the lower limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is decreasing.

[0140] As in the above steps S401 to S406, in the second preset time period, the grid load data is collected. These data record the load conditions of the grid at different time points and are the basis for subsequent load change analysis. The collected grid load data is processed to extract the load values ​​at multiple time points to represent the power demand of the grid at different time points. The grid load change value is calculated according to the calculation formula of the grid load change value, the end time of the second preset time period is marked as the start time of the prediction time period, the prediction duration is determined, and the end time of the prediction time period is obtained according to the prediction duration. Through this information, a prediction time period is constructed to evaluate future grid load changes. The fluctuation range of the grid load is determined by a load evaluation interval value. The upper and lower limits of the evaluation interval are used to determine whether the load change is within the normal range. If the calculated grid load change value falls within the load evaluation interval value, it means that the load change is stable, and the predicted load change information is marked as "stable". If the load change value exceeds the upper limit of the evaluation interval, it means that the grid load is increasing, and the load change information is marked as "increasing". If the load change value is lower than the lower limit of the evaluation interval, it means that the grid load is decreasing, and the load change information is marked as "decreasing". This can more effectively manage the grid load, reduce the pressure on the grid caused by sudden load changes, and improve the operational stability of the grid.

[0141] In a preferred embodiment, the step of obtaining the current grid frequency information and obtaining the charging and discharging strategy of the grid-connected energy storage system according to the output power adjustment information, the grid load forecast change information and the current grid frequency information includes:

[0142] S501, obtaining current grid frequency information, and obtaining a corresponding grid frequency weight according to the current grid frequency information;

[0143] S502, obtaining a corresponding power demand value according to the output power adjustment information;

[0144] S503, obtaining a corresponding grid load change value according to the grid load prediction change information;

[0145] S504, obtaining a strategy value according to the power demand value, the grid load change value and the grid frequency weight;

[0146] S505, obtaining a strategy table, where the strategy table includes multiple strategy interval values ​​and a charge and discharge strategy corresponding to each strategy interval value;

[0147] S506, obtaining a target policy interval value according to the policy value;

[0148] S507 . Obtain the corresponding charging and discharging strategy of the grid-connected energy storage system from the strategy table according to the target strategy interval value.

[0149] As in the above steps S501 to S507, the frequency information of the current power grid is obtained. The fluctuation of the power grid frequency directly reflects the imbalance of power grid supply and demand. According to different power grid frequency ranges, a corresponding weight is assigned to each frequency value. The frequency weight is used to measure the impact of the power grid frequency on the charging and discharging strategy of the energy storage system. According to the previous output power adjustment information, the power demand value required by the current power grid is obtained. According to the prediction of the power grid load data, the load change value is obtained. Considering the power demand value, the power grid load change value and the power grid frequency weight, the strategy value is obtained through a preset calculation formula. The calculation formula is: In the formula, C represents the strategy value, W y It is represented as the power demand value, F is represented as the grid load change value, α is represented as the grid frequency weight, and a preset strategy table is set, which contains multiple strategy interval values ​​and the charging and discharging strategies corresponding to each strategy interval value. The strategy table provides specific operation guidance for different strategy values ​​to ensure that the charging and discharging behavior of the energy storage system meets the actual needs of the grid. According to the calculated strategy value, the target strategy interval value is determined, which indicates the strategy range that the energy storage system should follow under specific circumstances in order to make corresponding charging and discharging adjustments. According to the target strategy interval value, the corresponding charging and discharging strategy is extracted from the strategy table. The strategy will guide the specific operation of the energy storage system to maintain the stability and efficient operation of the grid to ensure the frequency and load balance of the grid.

[0150] In a preferred embodiment, the step of adjusting the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and current voltage includes:

[0151] S701, obtaining a corresponding voltage adjustment value according to a charge and discharge strategy;

[0152] S702, acquiring a corresponding voltage fluctuation value according to the voltage fluctuation information;

[0153] S703, obtaining a voltage control value according to the voltage adjustment value, the voltage fluctuation value and the current voltage;

[0154] S704. Adjust the output power of the grid-connected energy storage system according to the voltage control value.

[0155] As in the above steps S701 to S704, according to the previously formulated charging and discharging strategy, the voltage adjustment value corresponding to the strategy is determined. This voltage value is set based on the charging and discharging demand and the grid state, and is the target voltage of the energy storage system. By monitoring the grid, the voltage fluctuation information of the grid is obtained, and the voltage fluctuation value is extracted from it. The voltage adjustment value, the voltage fluctuation value and the current voltage are comprehensively considered to calculate the voltage control value. The calculation formula is: In the formula, K represents the voltage control value, U y Expressed as voltage adjustment value, U b Expressed as voltage fluctuation value, U d It is represented by the current voltage. According to the calculated voltage control value, the output power of the grid-type energy storage system is adjusted. This adjustment will ensure that the output power of the energy storage system can effectively cope with voltage fluctuations and maintain the stability of the grid voltage. It can effectively cope with voltage fluctuations and avoid equipment failures or power supply interruptions caused by unstable voltage, thereby improving the overall stability of the grid.

[0156] In a preferred embodiment, after the step of adjusting the output power of the grid-type energy storage system according to the voltage control value, the step further includes:

[0157] S705, obtaining power data of the grid-connected energy storage system after control, and marking it as post-control power data;

[0158] S706, acquiring a corresponding post-control power value according to the post-control power data;

[0159] S707, obtaining the power in the standard post-control interval;

[0160] S708, determining whether the post-control power value is within the standard post-control interval power;

[0161] If the post-control power value is within the standard post-control interval power, the post-control power is determined to be normal;

[0162] If the post-control power value is not within the standard post-control interval power and is greater than the maximum value of the standard post-control interval power, it is determined that the post-control power is abnormal, and the power of the grid-type energy storage system after control is high, and the power demand information of the grid-type energy storage system after control is obtained, and the power demand information after control is marked, and the power demand information after control is returned as the power demand information to the step of obtaining the power demand information of the power grid;

[0163] If the power value after control is not within the standard power after control interval and is less than the minimum power value of the standard power after control interval, it is determined that the power after control is abnormal and the power of the grid-connected energy storage system after control is low. The power demand information of the grid-connected energy storage system after control is obtained, and the power demand information after control is marked. The power demand information after control is returned as power demand information to the step of obtaining the power demand information of the power grid.

[0164] As in the above steps S705 to S708, first, the power data of the grid-type energy storage system after regulation is obtained and marked as the power data after regulation. Then, the corresponding power value after regulation is extracted through data processing, and the corresponding interval value is obtained from the preset standard power data after regulation. These standard interval values ​​provide a reference for judging whether the power after regulation is within the normal range. The power value after regulation is compared with the power after regulation interval of the standard. If the power value after regulation is within the standard interval after regulation, it is judged that the power data after regulation is normal, indicating that the regulation measures are effective. If the power value after regulation is not within the standard interval after regulation and is greater than the maximum value of the interval, it is judged that the power data after regulation is abnormal and the power of the grid-type energy storage system is too high and needs further compensation. If the power value after regulation is less than the minimum value of the standard interval after regulation, it is judged that the power data after regulation is normal. If the power data is abnormal and the power of the grid-type energy storage system is low, further compensation is also required. When the grid-type energy storage system determines that the power data after control is abnormal, it will obtain the power demand information of the grid-type energy storage system after control, and use it as the new "power demand information", return to the previous step, and re-regulate. This cycle ensures that the grid-type energy storage system can gradually adjust the power until the expected balance state is reached. By obtaining the power data after control and judging whether it meets the standard post-control range, a closed-loop control can be achieved to ensure that the power state can be automatically detected after each control. If there is a deviation, secondary compensation is automatically performed. The state after control can be accurately identified to ensure that power regulation can truly solve the problem, avoid the continued existence of excessive or low power, and dynamically adjust the compensation strategy according to real-time data.

[0165] The present invention also provides a grid-type energy storage power balance control system, which is used for the above-mentioned grid-type energy storage power balance control method, comprising:

[0166] A power demand module is used to obtain power demand information of the power grid;

[0167] A voltage change module, used to obtain voltage change information corresponding to the power grid within a first preset time period;

[0168] A power adjustment module, used to obtain output power adjustment information according to power demand information and voltage change information;

[0169] A power grid load module, used to obtain power grid load data within a second preset time period, and obtain power grid load forecast change information according to the power grid load data;

[0170] The charging and discharging module is used to obtain the current grid frequency information and obtain the charging and discharging strategy of the grid-type energy storage system according to the output power adjustment information, grid load forecast change information and the current grid frequency information;

[0171] A voltage data module, used to obtain voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid;

[0172] The control module is used to adjust the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and current voltage.

[0173] As mentioned above, the power demand module is responsible for obtaining the power demand information of the power grid in real time, the voltage change module collects the voltage change information of the power grid within the first preset time period, the power adjustment module calculates the output power adjustment information according to the power demand information and the voltage change information, the power grid load module is responsible for obtaining the power grid load data within the second preset time period, and predicts the future load changes of the power grid based on these data, the charging and discharging module uses the current power grid frequency information, the output power adjustment information and the predicted power grid load change information to formulate the charging and discharging strategy of the grid-type energy storage system, the voltage data module is responsible for obtaining the voltage fluctuation information and the current voltage within the third preset time period, and provides real-time feedback on the grid voltage change by monitoring the voltage fluctuation, the control module dynamically adjusts the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and the current voltage, and by timely responding to the demand and voltage fluctuation of the power grid, the control module ensures that the energy storage system can adapt to the changes in the operation of the power grid, optimize the output power, effectively maintain the stability of the power grid, reduce the power supply problems caused by voltage fluctuations, reduce the risk of failures, achieve the balance of power supply and demand, and reduce the pressure caused by power grid load fluctuations.

[0174] And, a network-type energy storage power balance control terminal, comprising:

[0175] one or more processors;

[0176] a storage device having one or more programs stored thereon;

[0177] When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type energy storage power balance control method.

[0178] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A grid-type energy storage power balance control method, characterized in that: include: Obtain power demand information of the power grid; Obtaining voltage change information corresponding to the power grid within a first preset time period; Obtaining output power adjustment information according to power demand information and voltage change information; Obtaining grid load data within a second preset time period, and obtaining grid load forecast change information based on the grid load data; Obtain the current grid frequency information, and obtain the charging and discharging strategy of the grid-connected energy storage system based on the output power adjustment information, grid load forecast change information, and the current grid frequency information; Acquiring voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid; The output power of the grid-type energy storage system is adjusted according to the charging and discharging strategy, voltage fluctuation information and current voltage.

2. The grid-type energy storage power balance control method according to claim 1 is characterized in that: The step of obtaining voltage change information corresponding to the power grid within the first preset time period includes: Acquire multiple voltage values ​​of the power grid within a first preset time period; Obtaining a voltage change value according to a plurality of voltage values; Determine whether the voltage change value is within a preset range; If the voltage change value is within the preset range, the voltage change information corresponding to the power grid is stable; If the voltage change value is not within the preset interval and is greater than the upper limit value within the preset interval, the voltage change information corresponding to the power grid is increasing; If the voltage change value is not within the preset interval and is less than the lower limit value within the preset interval, the voltage change information corresponding to the power grid is decreasing.

3. The grid-type energy storage power balance control method according to claim 2 is characterized in that: The step of obtaining a plurality of voltage values ​​of the power grid within a first preset time period includes: Marking the time of obtaining the power demand information of the power grid as the end time; Obtain power threshold, standard duration, and standard duration power requirement ratio; Acquire a corresponding power demand value according to the power demand information; The first preset duration is calculated according to the power requirement value, the power threshold, the standard duration, and the standard duration power requirement ratio requirement, wherein the calculation formula is: Where, T d Represented as the first preset duration, W y Expressed as power demand value, W b It is represented as power threshold, B is represented as standard time power requirement ratio, T b Expressed as standard duration; Obtaining a start time according to the first preset duration and the end time; Obtain a first preset time period according to the start time and the end time; A plurality of voltage values ​​of the power grid at different times within a first preset time period are collected.

4. The grid-type energy storage power balance control method according to claim 1 is characterized in that: The step of acquiring output power adjustment information according to power demand information and voltage change information includes: Acquire a corresponding power demand value according to the power demand information; Acquire a corresponding voltage change value according to the voltage change information; Obtaining a power demand adjustment value according to the power demand value and the voltage change value; Obtain a power adjustment table, wherein the power adjustment table includes a plurality of power demand adjustment interval values ​​and output power adjustment information corresponding to each power demand adjustment interval value; Obtaining a target power demand adjustment interval value according to the power demand adjustment value; According to the target power demand adjustment interval value, the corresponding output power adjustment information is obtained from the power adjustment table.

5. The grid-type energy storage power balance control method according to claim 1 is characterized in that: The step of obtaining power grid load data within the second preset time period and obtaining power grid load forecast change information according to the power grid load data includes: Obtaining power grid load data within a second preset time period; Acquire corresponding multiple power grid load values ​​according to power grid load data; The grid load change value is calculated based on multiple grid load values, where the calculation formula is: In the formula, F represents the grid load change value, i represents the number of multiple grid load values, where i = 2, 3...n, D i Denotes the i-th grid load value, D i-1 It is represented as the i-1th grid load value; Marking the end time of the second preset time period as the start time of the prediction time period, obtaining the prediction duration, obtaining the end time of the prediction time period according to the prediction duration and the start time of the prediction time period, and constructing the prediction time period according to the start time of the prediction time period and the end time of the prediction time period; Obtain the power grid load assessment interval value corresponding to the forecast period; Determine whether the grid load change value is within the grid load assessment interval value; If the grid load change value is within the grid load assessment interval, the grid load forecast change information within the forecast period is stable; If the grid load change value is not within the grid load assessment interval value and is greater than the upper limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is increasing; If the grid load change value is not within the grid load assessment interval value and is less than the lower limit of the grid load assessment interval value, the grid load forecast change information within the forecast period is decreasing.

6. The grid-type energy storage power balance control method according to claim 1 is characterized in that: The step of obtaining the current grid frequency information and obtaining the charging and discharging strategy of the grid-connected energy storage system according to the output power adjustment information, the grid load forecast change information and the current grid frequency information includes: Obtain current grid frequency information, and obtain corresponding grid frequency weight according to the current grid frequency information; Acquire a corresponding power demand value according to the output power adjustment information; Obtaining corresponding grid load change values ​​according to grid load forecast change information; Obtaining a strategy value according to a power demand value, a grid load change value, and a grid frequency weight; Obtain a strategy table, the strategy table including multiple strategy interval values ​​and a charging and discharging strategy corresponding to each strategy interval value; Obtain the target strategy interval value according to the strategy value; The corresponding charging and discharging strategy of the grid-connected energy storage system is obtained from the strategy table according to the target strategy interval value.

7. The grid-type energy storage power balance control method according to claim 1 is characterized in that: The step of adjusting the output power of the grid-type energy storage system according to the charging and discharging strategy, the voltage fluctuation information and the current voltage includes: Obtaining a corresponding voltage adjustment value according to a charge and discharge strategy; Acquire a corresponding voltage fluctuation value according to the voltage fluctuation information; Obtaining a voltage control value according to a voltage adjustment value, a voltage fluctuation value and a current voltage; The output power of the grid-connected energy storage system is adjusted according to the voltage control value.

8. The grid-type energy storage power balance control method according to claim 7 is characterized in that: After the step of adjusting the output power of the grid-type energy storage system according to the voltage control value, the method further includes: Obtain the power data of the grid-connected energy storage system after regulation and mark it as post-regulation power data; Obtaining a corresponding post-control power value according to the post-control power data; Get the power in the standard post-control interval; Determine whether the post-control power value is within the standard post-control interval power; If the post-control power value is within the standard post-control interval power, the post-control power is determined to be normal; If the post-control power value is not within the standard post-control interval power and is greater than the maximum value of the standard post-control interval power, it is determined that the post-control power is abnormal, and the power of the grid-type energy storage system after control is high, and the power demand information of the grid-type energy storage system after control is obtained, and the power demand information after control is marked, and the power demand information after control is returned as the power demand information to the step of obtaining the power demand information of the power grid; If the power value after control is not within the standard power after control interval and is less than the minimum power value of the standard power after control interval, it is determined that the power after control is abnormal and the power of the grid-connected energy storage system after control is low. The power demand information of the grid-connected energy storage system after control is obtained, and the power demand information after control is marked. The power demand information after control is returned as power demand information to the step of obtaining the power demand information of the power grid.

9. A grid-type energy storage power balance control system, applied to the grid-type energy storage power balance control method according to any one of claims 1 to 8, characterized in that: include: A power demand module is used to obtain power demand information of the power grid; A voltage change module, used to obtain voltage change information corresponding to the power grid within a first preset time period; A power adjustment module, used to obtain output power adjustment information according to power demand information and voltage change information; A power grid load module, used to obtain power grid load data within a second preset time period, and obtain power grid load forecast change information according to the power grid load data; The charging and discharging module is used to obtain the current grid frequency information and obtain the charging and discharging strategy of the grid-type energy storage system according to the output power adjustment information, grid load forecast change information and the current grid frequency information; A voltage data module, used to obtain voltage fluctuation information of the power grid within a third preset time period and the current voltage of the power grid; The control module is used to adjust the output power of the grid-type energy storage system according to the charging and discharging strategy, voltage fluctuation information and current voltage.

10. A network-type energy storage power balance control terminal, characterized in that: include: one or more processors; a storage device having one or more programs stored thereon; When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type energy storage power balance control method as described in any one of claims 1 to 8.

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