A new energy station primary frequency modulation optimization control method and device

Abstract

The present invention discloses a method and device for optimizing the primary frequency regulation of a new energy station, wherein the method comprises: obtaining the frequency value of the new energy station; when the frequency value changes and exceeds the set dead zone value, adjusting the active power actually output by the new energy station so that the corresponding relationship between its active power and frequency is an arc, so as to reduce the frequency fluctuation and provide active power support when the frequency changes. By adopting the method of droop curve area integral to optimize the participation of new energy stations in the primary frequency regulation of the power grid, more active power support can be provided when the system frequency drops, and the active power output can be suppressed when the system frequency rises, reducing the surplus of the system active power, enhancing the anti-interference ability of the system frequency, suppressing the frequency fluctuation, and improving the stability of the power grid frequency and the rapidity of the primary frequency regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy power control, and in particular to a new energy station primary frequency regulation optimization control method and device. Background Art

[0002] With the large-capacity and high-proportion of new energy sources connected to the power grid, the power supply structure has undergone major changes, the proportion of fast frequency response resources available in the power grid has gradually decreased, and the frequency regulation pressure and safe operation risks of the power grid have continued to increase. It is urgent to participate in the fast frequency response of the power grid and improve the frequency risk prevention and control level of the large power grid. At present, new energy (wind, light, storage) stations use corresponding active power control systems, single machines or independent control devices to complete the active power-frequency droop characteristic control, so that they have the ability to participate in the rapid adjustment of the power grid frequency at the grid connection point.

[0003] In recent years, more and more new energy (wind, solar) stations have been connected to the power grid. The uncertainty and randomness of the output of such power sources have brought certain impacts to the system power balance, which in turn affects the stability of the system frequency. Especially in some power grids with weak grid structures, when a large number of new energy sources are connected, when the load changes greatly in a short period of time, the new energy resources participating in the primary frequency regulation of the power grid are relatively small, and the active support capacity of the conventional primary frequency regulation is insufficient, the system frequency will fluctuate greatly, which is not conducive to the stability of the power grid frequency. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a new energy station primary frequency regulation optimization control method and device, which optimizes the participation of new energy stations in the primary frequency regulation of the power grid by adopting the method of droop curve area integration, provides more active power support when the system frequency drops, and suppresses the active power output when the system frequency increases, reducing the system active power surplus, enhancing the anti-interference ability of the system frequency, suppressing frequency fluctuations, and improving the stability of the power grid frequency and the rapidity of primary frequency regulation.

[0005] In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides a new energy station primary frequency regulation optimization control method, comprising the following steps:

[0006] Get the frequency value of the new energy station;

[0007] When the frequency value changes, the active power actually output by the new energy station is adjusted so that the corresponding relationship between active power and frequency is an arc, so as to reduce the fluctuation of the frequency and provide support for the active power when the frequency changes.

[0008] Furthermore, when the frequency value changes, the active power output by the new energy station is adjusted so that the corresponding curve of active power-frequency is an arc, including:

[0009] When the frequency value changes, the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve is adjusted.

[0010] Further, the adjusting the active power corresponding to the low-frequency primary frequency modulation action area in the active power-frequency corresponding curve includes:

[0011] When the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area, calculating the low frequency primary frequency modulation active power;

[0012] According to the initial value of active power, calculate the active power adjustment value P of the new energy station L =P0-ΔP L .

[0013] Furthermore, the low-frequency primary frequency modulation active power shortage ΔP L for:

[0014]

[0015] Among them, f l is the low frequency primary frequency modulation dead zone, f min is the lower limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response, and β is the fast frequency response limiting coefficient.

[0016] Further, the active power corresponding to the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve is adjusted.

[0017] When the frequency value is greater than the upper limit frequency of the high-frequency primary frequency modulation action area, calculating the high-frequency primary frequency modulation active power;

[0018] According to the initial value of active power, calculate the active power adjustment value P of the new energy station H =P0-ΔP H .

[0019] Furthermore, the high frequency primary frequency modulation active power surplus ΔP H for:

[0020]

[0021] Among them, f h is the high frequency primary frequency modulation dead zone, f max is the upper limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P Nis the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response; β is the fast frequency response limiting coefficient.

[0022] Accordingly, a second aspect of an embodiment of the present invention provides a new energy station primary frequency regulation optimization control device, comprising:

[0023] A frequency sampling module, which is used to obtain the frequency value of the new energy station;

[0024] A power regulation module is used to adjust the active power actually output by the new energy station when the frequency value changes, so that the corresponding relationship between the active power and the frequency is an arc, so as to reduce the fluctuation of the frequency and provide support for the active power when the frequency changes.

[0025] Furthermore, when the frequency value changes, the power regulation module regulates the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency correspondence curve.

[0026] Furthermore, the power regulation module includes:

[0027] A low frequency calculation unit, used for calculating the low frequency primary frequency modulation active power when the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area;

[0028] A low-frequency power adjustment unit is used to calculate the active power adjustment value P of the new energy station according to the initial active power value. L =P0-ΔP L .

[0029] Furthermore, the low-frequency primary frequency modulation active power shortage ΔP L for:

[0030]

[0031] Among them, f l is the low frequency primary frequency modulation dead zone, f min is the lower limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response, and β is the fast frequency response limiting coefficient.

[0032] Furthermore, the power regulation module includes:

[0033] A high frequency calculation unit, used for calculating the high frequency primary frequency modulation active power when the frequency value is greater than the upper limit frequency of the high frequency primary frequency modulation action area;

[0034] A high frequency power adjustment unit, which is used to calculate the active power adjustment value P of the new energy station according to the initial value of active power H =P0-ΔP H .

[0035] Furthermore, the high frequency primary frequency modulation active power surplus ΔP H for:

[0036]

[0037] Among them, f h is the high frequency primary frequency modulation dead zone, f max is the upper limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response; β is the fast frequency response limiting coefficient.

[0038] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0039] By adopting the method of droop curve area integration, the participation of new energy stations in the primary frequency regulation of the power grid is optimized, which can provide more active power support when the system frequency drops, suppress the active power output when the system frequency increases, reduce the system active power surplus, enhance the anti-interference ability of the system frequency, suppress frequency fluctuations, and improve the stability of the power grid frequency and the rapidity of primary frequency regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of a conventional droop control curve for new energy participating in primary frequency regulation of a power grid in the prior art;

[0041] Figure 2 It is a schematic diagram of area integration of a conventional primary frequency modulation curve in the prior art;

[0042] Figure 3 This is a flow chart of a new energy station primary frequency regulation optimization control method provided by an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of a primary frequency modulation curve provided by an embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram comparing the conventional primary frequency modulation provided by an embodiment of the present invention and the specific implementation method of the primary frequency modulation of the present invention;

[0045] Figure 6 This is a block diagram of a primary frequency regulation optimization control device for a new energy station provided by an embodiment of the present invention;

[0046] Figure 7It is a block diagram of a power regulation module provided in an embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. Frequency sampling module, 2. Power regulation module, 21. Low frequency calculation unit, 22. Low frequency power adjustment unit, 23. High frequency calculation unit, 24. High frequency power adjustment unit. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0050] Please refer to Figure 3 and Figure 4 A first aspect of an embodiment of the present invention provides a method for optimizing the primary frequency regulation of a new energy station, comprising the following steps:

[0051] Step S100, obtaining the frequency value of the new energy station.

[0052] Step S200, when the frequency value changes and exceeds the set dead zone value, adjust the active power actually output by the new energy station so that the corresponding relationship between active power and frequency is an arc, so as to reduce the frequency fluctuation and provide active power support when the frequency changes.

[0053] Specifically, in step S200, when the frequency value changes, the active power output by the new energy station is adjusted so that the corresponding curve of the active power-frequency is an arc, further comprising:

[0054] When the frequency value changes, the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve is adjusted.

[0055] Further, in step S200, adjusting the active power corresponding to the low-frequency primary frequency modulation action area in the active power-frequency corresponding curve includes:

[0056] In step S211, when the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area, the low frequency primary frequency modulation active power is calculated.

[0057] In step S212, the active power adjustment value P of the new energy station is calculated based on the initial active power value. L =P0-ΔP L .

[0058] Specifically, the low-frequency primary frequency modulation active power shortage ΔPL for:

[0059]

[0060] Among them, f l is the low frequency primary frequency modulation dead zone, f min is the lower limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response, and β is the fast frequency response limiting coefficient.

[0061] In a specific embodiment, please refer to Figure 5 , known,

[0062] The primary frequency modulation dead zone is f l =50Hz-0.067Hz=49.933Hz,

[0063] The new energy fast frequency response adjustment rate is δ% = 2%,

[0064] Fast frequency response limiting coefficient β = 0.2,

[0065] Total rated power P N =4MW,

[0066] It is concluded that

[0067] When the system frequency drops to f=49.833 Hz, a primary frequency modulation is performed. The primary frequency modulation active power is calculated using the conventional primary frequency modulation method and the primary frequency modulation method of the present invention respectively:

[0068] (1) If conventional primary frequency modulation is used ( Figure 5 The active power shortage is calculated by using the dashed line on the left:

[0069]

[0070] (2) If the primary frequency modulation of the present invention is adopted ( Figure 5 The solid line on the left side of the figure calculates the active power deficit:

[0071]

[0072] Then |ΔP L2 |>|ΔP L1 |, under the condition of the same frequency drop, the new energy power source can output more active power for frequency support by adopting the primary frequency modulation control method of the present invention than by adopting the conventional primary frequency modulation control method.

[0073] Further, in step S200, the active power corresponding to the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve is adjusted, including:

[0074] Step S221, when the frequency value is greater than the upper limit frequency of the high frequency primary frequency modulation action area, the high frequency primary frequency modulation active power is calculated.

[0075] Step S222, calculating the active power adjustment value of the new energy station according to the initial active power value.

[0076] Furthermore, the high-frequency primary frequency modulation active power surplus ΔP H for:

[0077]

[0078] Among them, f h is the high frequency primary frequency modulation dead zone, f max is the upper limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response; β is the fast frequency response limiting coefficient.

[0079] In a specific embodiment, please refer to Figure 5 , known,

[0080] The primary frequency modulation dead zone is f h =50Hz+0.067Hz=50.067Hz,

[0081] The new energy fast frequency response adjustment rate is δ% = 3%,

[0082] Fast frequency response limiting coefficient β = 0.2,

[0083] Total rated power P N =4MW,

[0084] It is concluded that

[0085]

[0086] When the system frequency increases to f=50.267 Hz, a primary frequency modulation is performed. The primary frequency modulation active power is calculated by using the conventional primary frequency modulation method and the primary frequency modulation method of the present invention respectively:

[0087] (1) If conventional primary frequency modulation is used ( Figure 3 The dashed line on the right side of the middle) calculates the active power:

[0088]

[0089] (2) If the primary frequency modulation of the present invention is adopted ( Figure 3 The solid line on the right side of the middle) calculates the active power:

[0090]

[0091] Then ΔP H2 >ΔP H1 Under the condition of the same frequency increase, the new energy power source can suppress more active power to reduce the system active power surplus by adopting the primary frequency modulation control method of the present invention than by adopting the conventional primary frequency modulation control method.

[0092] Accordingly, please refer to Figure 6 A second aspect of an embodiment of the present invention provides a new energy station primary frequency regulation optimization control device, comprising:

[0093] Frequency sampling module 1, which is used to obtain the frequency value of the new energy station;

[0094] The power regulation module 2 is used to adjust the active power actually output by the new energy station when the frequency value changes, so that the corresponding relationship between the active power and the frequency is an arc, so as to reduce the frequency fluctuation and provide active power support when the frequency changes.

[0095] Furthermore, when the frequency value changes, the power regulating module 2 regulates the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve.

[0096] For further information, please refer to Figure 7 , the power regulation module includes:

[0097] A low frequency calculation unit 21, which is used to calculate the low frequency primary frequency modulation active power when the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area;

[0098] The low-frequency power adjustment unit 22 is used to calculate the active power adjustment value P of the new energy station according to the initial value of active power. L =P0-ΔP L .

[0099] Furthermore, the low-frequency primary frequency modulation active power shortage ΔP L for:

[0100]

[0101] Among them, f l is the low frequency primary frequency modulation dead zone, f min is the lower limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P Nis the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response, and β is the fast frequency response limiting coefficient.

[0102] For further information, please refer to Figure 7 , the power regulation module 2 also includes:

[0103] A high frequency calculation unit 23, which is used to calculate the high frequency primary frequency modulation active power when the frequency value is greater than the upper limit frequency of the high frequency primary frequency modulation action area;

[0104] The high frequency power adjustment unit 24 is used to calculate the active power adjustment value P of the new energy station according to the initial value of active power. H =P0-ΔP H .

[0105] Specifically, the high-frequency primary frequency modulation active power surplus ΔP H for:

[0106]

[0107] Among them, f h is the high frequency primary frequency modulation dead zone, f max is the upper limit frequency of the primary frequency modulation action area, f N is the system rated frequency, P N is the total rated power, P0 is the initial value of active power, δ% is the adjustment rate of new energy fast frequency response; β is the fast frequency response limiting coefficient.

[0108] The embodiment of the present invention aims to protect a method and device for optimizing the primary frequency regulation control of a new energy station, wherein the method includes: obtaining the frequency value of the new energy station; when the frequency value changes, adjusting the active power actually output by the new energy station so that the corresponding relationship between the active power and the frequency is an arc, so as to reduce the frequency fluctuation and provide active power support when the frequency changes. The above technical solution has the following effects:

[0109] By adopting the method of droop curve area integration, the participation of new energy stations in the primary frequency regulation of the power grid is optimized, which can provide more active power support when the system frequency drops, suppress the active power output when the system frequency increases, reduce the system active power surplus, enhance the anti-interference ability of the system frequency, suppress frequency fluctuations, and improve the stability of the power grid frequency and the rapidity of primary frequency regulation.

[0110] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A method for optimizing the primary frequency regulation control of a new energy station, characterized in that: The steps include: Get the frequency value of the new energy station; When the frequency value changes and exceeds the set dead zone value, the active power actually output by the new energy station is adjusted so that the corresponding relationship between the active power and the frequency is an arc, so as to reduce the fluctuation of the frequency and provide support for the active power when the frequency changes; The active power output by the new energy station is adjusted when the frequency value changes so that the corresponding curve of active power-frequency is an arc, including: When the frequency value changes, adjusting the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve; The adjusting the active power corresponding to the low-frequency primary frequency modulation action area in the active power-frequency corresponding curve includes: When the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area, calculating the low frequency primary frequency modulation active power; According to the initial value of active power, calculate the active power adjustment value of the new energy station ; The adjusting the active power corresponding to the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve includes: When the frequency value is greater than the upper limit frequency of the high-frequency primary frequency modulation action area, calculating the high-frequency primary frequency modulation active power; According to the initial value of active power, calculate the active power adjustment value of the new energy station ; Low frequency primary frequency modulation active power shortage for: ， in, It is the low frequency primary frequency modulation dead zone. is the lower limit frequency of the primary frequency modulation action area, is the system rated frequency, is the total rated power, is the initial value of active power, It is the rapid frequency response adjustment rate of new energy. is the fast frequency response limiting coefficient; High frequency primary frequency modulation active power surplus for: ； in, It is the high frequency primary frequency modulation dead zone. is the upper limit frequency of the primary frequency modulation action area, is the system rated frequency, is the total rated power, is the initial value of active power, Rapid frequency response modulation rate for new energy; is the fast frequency response limiting coefficient.

2. A new energy station primary frequency modulation optimization control device, characterized in that: include: A frequency sampling module, which is used to obtain the frequency value of the new energy station; A power regulation module, which is used to adjust the active power actually output by the new energy station when the frequency value changes, so that the corresponding relationship between the active power and the frequency is an arc, so as to reduce the fluctuation of the frequency and provide support for the active power when the frequency changes; The power regulating module regulates the active power corresponding to the low-frequency primary frequency modulation action area or the high-frequency primary frequency modulation action area in the active power-frequency corresponding curve when the frequency value changes; The power regulation module comprises: A low frequency calculation unit, used for calculating the low frequency primary frequency modulation active power when the frequency value is less than the lower limit frequency of the low frequency primary frequency modulation action area; A low-frequency power adjustment unit, which is used to calculate the active power adjustment value of the new energy station according to the initial active power value ; The power regulation module comprises: A high frequency calculation unit, used for calculating the high frequency primary frequency modulation active power when the frequency value is greater than the upper limit frequency of the high frequency primary frequency modulation action area; A high-frequency power adjustment unit, which is used to calculate the active power adjustment value of the new energy station according to the initial active power value ; Low frequency primary frequency modulation active power shortage for: ， in, It is the low frequency primary frequency modulation dead zone. is the lower limit frequency of the primary frequency modulation action area, is the system rated frequency, is the total rated power, is the initial value of active power, It is the rapid frequency response adjustment rate of new energy. is the fast frequency response limiting coefficient; High frequency primary frequency modulation active power surplus for: ； in, It is the high frequency primary frequency modulation dead zone. is the upper limit frequency of the primary frequency modulation action area, is the system rated frequency, is the total rated power, is the initial value of active power, Rapid frequency response modulation rate for new energy; is the fast frequency response limiting coefficient.

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