New energy storage configuration system and method that meets grid secondary frequency regulation requirements

Abstract

The new energy storage configuration system of the present invention, which meets the secondary frequency regulation requirements of the power grid, includes a login authentication module, a data entry module, a frequency regulation capacity configuration module, an energy storage capacity configuration module and a data output module; the login authentication module is used for user self-identity confirmation; the data entry module is connected to the login authentication module, the frequency regulation capacity configuration module is connected to the data entry module, the energy storage capacity configuration module is connected to the data entry module and the frequency regulation capacity configuration module, and the data output module is connected to the energy storage capacity configuration module; the present invention overcomes the shortcomings of the prior art, and in response to the existing unresolved problems, proposes a storage configuration method and system specific to new energy stations, thereby achieving reasonable configuration of energy storage scale, meeting the safe operation requirements of the power system, and avoiding resource waste and cost increases.

Description

Technical Field

[0001] The present invention relates to the fields of power system operation, new energy and energy storage, and in particular to a Background Art

[0002] Renewable energy sources are characterized by volatility, intermittency, and uncertainty. As the scale of renewable energy grid integration continues to expand and the proportion of renewable energy generation gradually increases, a series of power system operational issues will arise, including system security, power supply, and wind and solar power curtailment. To address this issue, the power system needs to increase flexible resources that can smooth out the fluctuations of renewable energy sources. Energy storage, as a high-quality regulatory resource, will become a crucial component of power systems with a high proportion of renewable energy.

[0003] However, the country has yet to establish standards for energy storage capacity for wind and solar power generation installations. Some provinces and regions require energy storage capacity to be approximately 5% to 20% of renewable energy generation capacity, a relatively broad range that also lacks clarity on the specific issues addressed by energy storage deployment. Existing methods generally lack specific energy storage deployment methods and systems for renewable energy sites. For each specific power system operation issue, rationally planning energy storage capacity is of critical practical significance. This ensures safe and stable power system operation while also preventing waste of social resources and increasing electricity costs. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, establish a specific energy storage configuration method, and provide a method and system for configuring the internal energy storage scale of a new energy power station that meets the secondary frequency regulation control requirements of the power system.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A new energy storage configuration system that meets the secondary frequency regulation requirements of the power grid includes a login authentication module, a data entry module, a frequency regulation capacity configuration module, an energy storage capacity configuration module, and a data output module;

[0007] The login authentication module is used for user self-identification;

[0008] The data entry module is connected to the login authentication module and enters the load-related data required by the frequency modulation capacity configuration module and the energy storage capacity configuration module;

[0009] The frequency modulation capacity configuration module is connected to the data entry module, obtains the load-related data entered by the data entry module, calculates the capacity required for frequency modulation based on the load-related data, obtains the appropriate adjustment amount and transmits it to the energy storage capacity configuration module;

[0010] The energy storage capacity configuration module is connected to the data entry module and the frequency modulation capacity configuration module, obtains the load-related data transmitted by the data entry module and the frequency modulation data transmitted by the frequency modulation capacity configuration module, solves and obtains the energy storage configuration capacity that meets a certain new energy consumption target, and transmits the data to the data output module;

[0011] The data output module is connected to the energy storage capacity configuration module, and outputs the configuration capacity transmitted from the energy storage capacity configuration module to form a report.

[0012] Furthermore, the frequency regulation capacity configuration module obtains the required frequency regulation capacity through calculation; the energy storage capacity configuration module calculates the required energy storage configuration capacity by configuring each level of new energy consumption, and thereby obtains the energy storage charge and discharge curve; the report generated by the data output module includes the energy storage configuration capacity under each new energy consumption level.

[0013] A new energy storage configuration method that meets the secondary frequency regulation requirements of the power grid includes the following steps:

[0014] S1. Input load and new energy data through the data entry module;

[0015] S2. Frequency regulation capacity configuration module calculates the regulation capacity required for secondary frequency regulation

[0016] S3, the energy storage capacity configuration module calculates the required energy storage capacity and configures the energy storage charge and discharge curve according to the energy storage capacity;

[0017] S4. Output the reports generated by each data module, including the regulation capacity required for secondary frequency regulation, energy storage configuration capacity and its charging and discharging power, and the power generation curve after the new energy configuration energy storage.

[0018] Furthermore, the method of step S1 is:

[0019] Obtain the load output time series power of the power system on typical days throughout the year, and the wind and solar time series power of each new energy photovoltaic and wind farm station in the power system.

[0020] Furthermore, the method of step S2 is:

[0021] S2.1. Determine the output of new energy;

[0022] S2.2, smoothing the original load output by sliding average method;

[0023] S2.3. Calculate the regulation capacity required for secondary frequency regulation;

[0024] The calculation formula of the sliding average method in step 2.2 is:

[0025]

[0026] Among them, Lft LD (t) is the load value at time t after smoothing by the rolling average method; Lt LD (t) is the load value at the original load time t; M is the number of time periods; 2M+1 is the number of time periods for processing data using the sliding average method.

[0027] Furthermore, the calculation formula for calculating the frequency modulation capacity required for the secondary frequency modulation in step 2.3 is:

[0028] ALC LD =Lt LD -Lft LD

[0029]

[0030] C LD =3δ LD

[0031] Where ALC LD To adjust the load component, Lt LD is the original load output, Lft LD is the smoothed load output; μ LD is the average value of the regulated load component; δ LD is the standard deviation of the original load adjustment load component, n is the number of adjustment load components, C LD It is the secondary frequency regulation capacity of the power system corresponding to the original load.

[0032] Furthermore, the method of step S3 is:

[0033] S3.1. Calculate the secondary frequency regulation capacity after taking into account new energy sources;

[0034] S3.2. Divide the secondary frequency regulation capacity of the original load by the secondary frequency regulation capacity after accounting for new energy sources, and use this as the preliminary estimate of the energy storage configuration capacity;

[0035] S3.3. Based on the energy storage configuration capacity, perform energy storage operation simulation through control strategies to establish energy storage charging and discharging power;

[0036] S3.4. Obtain the optimal energy storage configuration capacity;

[0037] S3.5. Allocate the obtained optimized total energy storage configuration capacity to each new energy station according to the new energy station topology structure.

[0038] Furthermore, the calculation formula of step 3.1 is:

[0039] Lt NLD =Lt LD -LtRE

[0040]

[0041] ALC NLD =Lt NLD -Lft NLD

[0042]

[0043] C NLD =3δ NLD

[0044] Among them, Lt LD is the original load output, Lt RE Contribute to new energy, Lft NLD (t) is the net load value at time t after smoothing by the rolling average method; 2M+1 is the number of time periods for the data processed by the sliding average method, ALC NLD To adjust the load component, μ NLD is the average value of the load component, δ NLD is the standard deviation of the load component, n is the number of load components, C NLD is the net load secondary frequency regulation capacity.

[0045] Furthermore, the energy storage charge and discharge curve control strategy of step 3.3 is:

[0046] In each control interval, it operates at maximum power, reaches the required power at maximum power first, and then waits for the next time node to start before taking action. The energy storage charge and discharge curve conforms to the characteristics of discharging when the frequency regulation demand increases and charging when the frequency regulation demand decreases.

[0047] Furthermore, the method for calculating the optimal energy storage configuration described in step 3.4 is:

[0048] Combine the energy storage charge and discharge curve mentioned in step 3.3 with the original new energy curve to obtain a new new energy curve, and then subtract the new energy curve from the original load to obtain a new net load curve;

[0049] Specifically: Use the new net load curve to solve the secondary frequency regulation capacity in the above manner and compare it with the original frequency regulation capacity. If it is greater than the original frequency regulation capacity, increase the energy storage capacity in steps of 10MW. If it is less than the original frequency regulation capacity, decrease the energy storage capacity in steps of 10MW. Then bring it into step 3.3 to calculate the energy storage charge and discharge curve and calculate until the calculated frequency regulation capacity is equal to the original load secondary frequency regulation capacity. This energy storage capacity is the optimal energy storage configuration capacity.

[0050] Beneficial effects of the present invention:

[0051] The advantages of the present invention are: overcoming the deficiencies of the existing technology, and in response to existing unresolved problems, proposing a method and system for energy storage configuration specific to new energy stations, thereby achieving a reasonable configuration of energy storage scale, meeting the safe operation requirements of the power system, and avoiding resource waste and cost increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a structural diagram of the sliding average method proposed in the present invention; DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] A new energy storage configuration system that meets the secondary frequency regulation requirements of the power grid includes a login authentication module, a data entry module, a frequency regulation capacity configuration module, an energy storage capacity configuration module, and a data output module;

[0057] The login authentication module is used for user self-identification;

[0058] The data entry module is connected to the login authentication module and enters the load-related data required by the frequency modulation capacity configuration module and the energy storage capacity configuration module;

[0059] The frequency modulation capacity configuration module is connected to the data entry module, obtains the load-related data entered by the data entry module, calculates the capacity required for frequency modulation based on the load-related data, obtains the appropriate adjustment amount and transmits it to the energy storage capacity configuration module;

[0060] The energy storage capacity configuration module is connected to the data entry module and the frequency modulation capacity configuration module, obtains the load-related data transmitted by the data entry module and the frequency modulation data transmitted by the frequency modulation capacity configuration module, solves and obtains the energy storage configuration capacity that meets a certain new energy consumption target, and transmits the data to the data output module;

[0061] The data output module is connected to the energy storage capacity configuration module, and outputs the configuration capacity transmitted from the energy storage capacity configuration module to form a report.

[0062] Among them, the frequency regulation capacity configuration module obtains the required frequency regulation capacity through calculation; the energy storage capacity configuration module calculates the required energy storage configuration capacity by configuring each level of new energy consumption, and obtains the energy storage charging and discharging curve based on this; the report generated by the data output module includes the energy storage configuration capacity under each new energy consumption level.

[0063] A new energy storage configuration method that meets the secondary frequency regulation requirements of the power grid includes the following steps:

[0064] S1. Input load and new energy data through the data entry module;

[0065] S2. Frequency regulation capacity configuration module calculates the regulation capacity required for secondary frequency regulation

[0066] S3, the energy storage capacity configuration module calculates the required energy storage capacity and configures the energy storage charge and discharge curve according to the energy storage capacity;

[0067] S4. Output the reports generated by each data module, including the regulation capacity required for secondary frequency regulation, energy storage configuration capacity and its charging and discharging power, and the power generation curve after the new energy configuration energy storage.

[0068] The method of step S1 is:

[0069] Obtain the load output time sequence power of the power system and the wind and solar time sequence power of each new energy photovoltaic and wind farm station in the power system on a typical day throughout the year; in this embodiment, the 12 months of the year, the 15th of each month is a typical day of the month, and a total of 5760 power system load output time sequence powers with a time granularity of 15 seconds per day on typical days are obtained; obtain a total of 5760 wind and solar time sequence powers with a time granularity of 15 seconds per day on the same typical day for each new energy photovoltaic and wind farm station in the power system;

[0070] The method of step S2 is:

[0071] S2.1. Determine the output of new energy;

[0072] S2.2, smoothing the original load output by sliding average method;

[0073] S2.3. Calculate the regulation capacity required for secondary frequency regulation;

[0074] The new energy output in step 2.1 is the total new energy output gathered from various new energy stations according to a certain topological structure.

[0075] The calculation formula of the sliding average method in step 2.2 is:

[0076]

[0077] Among them, Lft LD (t) is the load value at time t after smoothing by the rolling average method; Lt LD (t) is the load value at the original load time t; M is the number of time periods, M in the formula is 30, 2M+1 is the number of time periods for processing data using the sliding average method, which is 61, totaling 15.25 minutes;.

[0078] The original load output is processed by sliding average with 61 as the time period to obtain a smooth load curve. The original load curve is then subtracted from the load curve after sliding average processing to obtain the regulated load component curve.

[0079] Among them, the sliding average method diagram, the number of time periods in the diagram is 3, such as Figure 1 As shown:

[0080] The calculation formula for calculating the frequency modulation capacity required for secondary frequency modulation in step 2.3 is:

[0081] ALC LD =Lt LD -Lft LD

[0082]

[0083] C LD =3δ LD

[0084] Where ALC LD To adjust the load component, Lt LD is the original load output, Lft LD is the smoothed load output; μ LD is the average value of the regulated load component. LD is the standard deviation of the original load adjustment load component, n is the number of adjustment load components, C LD It is the secondary frequency regulation capacity of the power system corresponding to the original load.

[0085] The method of step S3 is:

[0086] S3.1. Calculate the secondary frequency regulation capacity after taking into account new energy sources;

[0087] S3.2. Divide the secondary frequency regulation capacity of the original load by the secondary frequency regulation capacity after accounting for new energy sources, and use this as the preliminary estimate of the energy storage configuration capacity;

[0088] S3.3. Based on the energy storage configuration capacity, perform energy storage operation simulation through control strategies to establish energy storage charging and discharging power;

[0089] S3.4. Obtain the optimal energy storage configuration capacity;

[0090] S3.5. Allocate the obtained optimized total energy storage capacity to each new energy station according to the new energy station topology;

[0091] The calculation formula of step S3.1 is:

[0092] Lt NLD =Lt LD -Lt RE

[0093]

[0094] ALC NLD =Lt NLD -Lft NLD

[0095]

[0096] C NLD =3δ NLD

[0097] Among them, Lt LD is the original load output, Lt RE Contribute to new energy, Lft NLD (t) is the net load value at time t after smoothing by the rolling average method; 2M+1 is the number of time periods for the data processed by the sliding average method, which is 61. In this step, M is 30. NLD To adjust the load component, μ NLD is the average value of the regulated load component; δ NLD is the standard deviation of the load component, n is the number of load components, C NLD is the net load secondary frequency regulation capacity.

[0098] The energy storage charge and discharge curve control strategy of step S3.3 is:

[0099] In each control interval, it operates at maximum power, reaches the required power at maximum power first, and then waits for the next time node to start before taking action. The energy storage charge and discharge curve conforms to the characteristics of discharging when the frequency regulation demand increases and charging when the frequency regulation demand decreases.

[0100] in:

[0101] Charge and discharge power constraints:

[0102] -Q in ≤Q t ≤Q out

[0103] State of charge constraints:

[0104] E min ≤E t ≤E max

[0105] Where, -Q in Indicates the maximum charging power; Q out Indicates the maximum discharge power; E min Indicates the minimum state of charge; E max Indicates maximum state of charge

[0106] Step S3.4 describes the method for calculating the optimal energy storage configuration:

[0107] The energy storage charge and discharge curve mentioned in step S3.3 is combined with the original new energy curve to obtain a new new energy curve, and then the original load is subtracted from it to obtain a new net load curve; the secondary frequency regulation capacity is solved according to the above method using the new net load curve, and compared with the original frequency regulation capacity. If it is greater than the original frequency regulation capacity, the energy storage capacity is increased in steps of 10MW; if it is less than the original frequency regulation capacity, the energy storage capacity is reduced in steps of 10MW; then it is brought into the energy storage charge and discharge curve calculated in step S3.3 for calculation until the calculated frequency regulation capacity is equal to the secondary frequency regulation capacity of the original load. In this case, this energy storage capacity is the optimal energy storage configuration capacity.

[0108] The specific calculation formula is:

[0109] Lt NRE =Lt ESS +Lt RE

[0110] Lt RNLD =Lt LD -Lt NRE

[0111]

[0112] ALC RNLD =Lt RNLD -Lft RNLD

[0113]

[0114] C RNLD =3δ RNLD

[0115] Among them, Lt LD is the original load output, Lt RE To contribute to the original new energy, Lt ESS is the energy storage charge and discharge curve, Lft RNLD (t) The new net load value at time t after smoothing by the rolling average method; 2M+1 is the number of time periods for the data processed by the sliding average method, which is 61. In this step, M is 30; ALC RNLD To adjust the load component, μ RNLD is the average value of the load component, δ RNLD To adjust the load component standard deviation, C RNLD It is the secondary frequency modulation capacity.

[0116] The optimal energy storage configuration capacity calculated by the above formula constructs the energy storage charge and discharge curve described in step 3.3 to meet the frequency regulation needs when the consumption of new energy increases.

[0117] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new energy storage configuration method that meets the requirements of secondary frequency regulation of the power grid is characterized by: The following steps are involved: S1. Input load and new energy data through the data entry module; S2, the frequency regulation capacity configuration module calculates the secondary frequency regulation capacity of the original load; S3, the energy storage capacity configuration module calculates the required energy storage capacity and configures the energy storage charge and discharge curve according to the energy storage capacity; S4. Output the reports generated by each data module, including the original load secondary frequency regulation capacity, energy storage configuration capacity and its charging and discharging power, and the power generation curve after the new energy configuration energy storage; The method of step S2 is: S2.

1. Determine the original load output; S2.2, smoothing the original load output by sliding average method; S2.

3. Calculate the secondary frequency regulation capacity of the original load; The calculation formula of the sliding average method in step 2.2 is: Among them, Lft LD (t) is the load value at time t after smoothing by the rolling average method; Lt LD (t) is the load value at the original load output time t; M is the number of time periods; 2M+1 is the number of time periods for the data processed by the sliding average method; The method of step S3 is: S3.

1. Calculate the secondary frequency regulation capacity after taking into account new energy sources; S3.

2. Divide the secondary frequency regulation capacity of the original load by the secondary frequency regulation capacity after accounting for new energy sources, and use this as the preliminary estimate of the energy storage configuration capacity; S3.

3. Based on the energy storage configuration capacity, perform energy storage operation simulation through control strategies to establish energy storage charging and discharging power; S3.

4. Obtain the optimal energy storage configuration capacity; S3.

5. Allocate the obtained optimized total energy storage capacity to each new energy station according to the new energy station topology; The calculation formula of step 3.1 is: Lt NLD =Lt LD -Lt RE ALC NLD =Lt NLD -Lft NLD C NLD =3δ NLD Among them, Lt LD is the original load output, Lt RE Contribute to new energy, Lft NLD (t) is the net load value at time t after smoothing by the rolling average method; 2M+1 is the number of time periods for the data processed by the sliding average method, ALC NLD To adjust the load component, μ NLD is the average value of the load component, δ NLD is the standard deviation of the load component, n is the number of load components, C NLD is the net load secondary frequency regulation capacity; Step 3.4 describes the method for calculating the optimal energy storage configuration: Combine the energy storage charge and discharge curve mentioned in step 3.3 with the original new energy curve to obtain a new new energy curve, and then subtract the new energy curve from the original load to obtain a new net load curve; Specifically: Use the new net load curve to solve the secondary frequency regulation capacity in the above manner and compare it with the original frequency regulation capacity. If it is greater than the original frequency regulation capacity, increase the energy storage capacity in steps of 10MW. If it is less than the original frequency regulation capacity, decrease the energy storage capacity in steps of 10MW. Then bring it into step 3.3 to calculate the energy storage charge and discharge curve and calculate until the calculated frequency regulation capacity is equal to the original load secondary frequency regulation capacity. This energy storage capacity is the optimal energy storage configuration capacity.

2. The new energy storage configuration method that meets the secondary frequency regulation requirements of the power grid according to claim 1 is characterized in that: The method of step S1 is: Obtain the load output time series power of the power system on typical days throughout the year, and the wind and solar time series power of each new energy photovoltaic and wind farm station in the power system.

3. The new energy storage configuration method that meets the secondary frequency regulation requirements of the power grid according to claim 1 is characterized in that: The calculation formula for calculating the frequency modulation capacity required for secondary frequency modulation in step 2.3 is: ALC LD =Lt LD -Lft LD C LD =3δ LD Where ALC LD To adjust the load component, Lt LD is the original load output, Lft LD is the smoothed load output; μ LD is the average value of the regulated load component; δ LD is the standard deviation of the original load adjustment load component, n is the number of adjustment load components, C LD It is the secondary frequency regulation capacity of the power system corresponding to the original load.

4. The new energy storage configuration method that meets the secondary frequency regulation requirements of the power grid according to claim 1 is characterized in that: The energy storage charge and discharge curve control strategy of step 3.3 is: In each control interval, it operates at maximum power, reaches the required power at maximum power first, and then waits for the next time node to start before taking action. The energy storage charge and discharge curve conforms to the characteristics of discharging when the frequency regulation demand increases and charging when the frequency regulation demand decreases.

5. A system for configuring a new energy storage system that meets the requirements of secondary frequency regulation of a power grid based on any one of claims 1 to 4, characterized in that: It includes login authentication module, data entry module, frequency modulation capacity configuration module, energy storage capacity configuration module and data output module; The login authentication module is used for user self-identification; The data entry module is connected to the login authentication module and enters the load-related data required by the frequency modulation capacity configuration module and the energy storage capacity configuration module; The frequency modulation capacity configuration module is connected to the data entry module, obtains the load-related data entered by the data entry module, calculates the capacity required for frequency modulation based on the load-related data, obtains the appropriate adjustment amount and transmits it to the energy storage capacity configuration module; The energy storage capacity configuration module is connected to the data entry module and the frequency modulation capacity configuration module, obtains the load-related data transmitted by the data entry module and the frequency modulation data transmitted by the frequency modulation capacity configuration module, solves and obtains the energy storage configuration capacity that meets a certain new energy consumption target, and transmits the data to the data output module; The data output module is connected to the energy storage capacity configuration module, and outputs the configuration capacity transmitted from the energy storage capacity configuration module to form a report.

6. The new energy storage configuration system that meets the secondary frequency regulation requirements of the power grid according to claim 5 is characterized in that: The frequency regulation capacity configuration module obtains the required frequency regulation capacity through calculation; the energy storage capacity configuration module calculates the required energy storage configuration capacity by configuring each level of new energy consumption, and thereby obtains the energy storage charge and discharge curve; the report generated by the data output module includes the energy storage configuration capacity under each new energy consumption level.

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