CN112003304B - Power fluctuation suppression and frequency modulation control method based on hybrid energy storage system - Google Patents

Abstract

The present application provides a power fluctuation suppression and frequency modulation control method based on a hybrid energy storage system. The method includes: calculating the wind power fluctuation amount according to the first output power of the wind farm; , the system frequency offset of the power system, the frequency change rate, the real-time charge state of the hybrid energy storage system and the second output power, and the filtering time constant is calculated; using the filtering time constant, the first output power is subjected to high-pass filtering to obtain The third output power of the hybrid energy storage system; using the preset filtering time constant, the third output power is subjected to low-pass filtering processing to obtain the fourth output power of the battery and the fifth output power of the super capacitor, so that the battery can obtain the fourth output power of the super capacitor according to the fourth output power. The output power and the supercapacitor simultaneously suppress wind power fluctuation and control wind power frequency modulation according to the fifth output power. The embodiments of the present application can not only suppress the fluctuation of wind power, but also improve the frequency regulation capability of wind power.

Description

A power fluctuation suppression and frequency modulation control method based on hybrid energy storage system

technical field

The present application relates to the field of computer technology, and in particular, to a power fluctuation suppression and frequency modulation control method based on a hybrid energy storage system.

Background technique

In recent years, the use of renewable energy for power generation has attracted more and more attention from various countries, especially wind power has been vigorously developed, and the combination of hybrid energy storage and large-capacity wind power generation systems is a necessary trend in the development of renewable energy.

When carrying out hybrid energy storage, how to suppress the fluctuation of wind power and control the frequency regulation ability of wind power is an important research content in the process of wind power generation. Generally speaking, the main method to suppress the fluctuation of wind power is to connect the energy storage device to the grid connection point of the wind farm, and use the energy storage device to absorb or emit part of the power to reduce the fluctuation of the grid-connected power. The main method to control the frequency regulation capability of wind power is to use the wind turbine itself to control.

In the current methods for stabilizing wind power fluctuations and improving wind power frequency regulation capabilities, they are generally handled separately, and cannot meet the requirements of wind power fluctuations and wind power frequency regulation capabilities in relevant standards at the same time.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide a power fluctuation suppression and frequency regulation control method based on a hybrid energy storage system, so as to suppress the wind power fluctuation and at the same time improve the wind power frequency regulation capability.

In a first aspect, an embodiment of the present application provides a power fluctuation suppression and frequency modulation control method based on a hybrid energy storage system, the method is applied to an energy processing system, and the energy processing system includes a wind power processing unit, a filter time constant calculation unit, high-pass filter processing unit and low-pass filter processing unit; the hybrid energy storage system includes a battery and a super capacitor; the method includes:

According to the collected first output power of the wind farm, the fluctuation amount of wind power is calculated and obtained;

According to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system and the hybrid energy storage system The second output power of , the filter time constant is obtained by calculation;

Using the filtering time constant, high-pass filtering is performed on the first output power to obtain the third output power of the hybrid energy storage system;

Using the filtering time constant, low-pass filtering is performed on the third output power to obtain the fourth output power of the battery and the fifth output power of the supercapacitor, so that the battery is based on the fourth output power of the super capacitor. The output power and the supercapacitor simultaneously suppress wind power fluctuation and control wind power frequency modulation according to the fifth output power.

With reference to the first aspect, the embodiment of the present application provides the first possible implementation of the first aspect, wherein, before the step of calculating the wind power fluctuation amount according to the collected first output power of the wind farm, the method further includes:

The first output power of the wind farm, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system, and the second output power of the hybrid energy storage system are acquired.

In conjunction with the first aspect, the embodiment of the present application provides a second possible implementation manner of the first aspect, wherein the step calculates and obtains the wind power fluctuation amount according to the collected first output power of the wind farm, including:

obtaining the first output power P _WT (t) of the wind farm at time t, and the first output power P _WT (t-1) of the wind farm at time t-1;

Calculate the difference between the first output power P _WT (t) of the wind farm at the time t and the first output power P _WT (t-1) of the wind farm at the time t-1 to obtain the wind power fluctuation amount ΔP _WT .

In conjunction with the first aspect, the embodiments of the present application provide a third possible implementation manner of the first aspect, wherein the steps are based on the first output power, the wind power fluctuation amount, the system frequency offset of the power system, The frequency change rate of the power system, the real-time charge state of the hybrid energy storage system, and the second output power of the hybrid energy storage system are calculated to obtain a filtering time constant, including:

calculating a first sub-filtering time constant according to the first output power, the wind power fluctuation amount, the second output power of the hybrid energy storage system, and the first preset time period;

calculating a second sub-filtering time constant according to the first output power, the wind power fluctuation amount, the second output power of the hybrid energy storage system, and a second preset time period;

calculating a third sub-filtering time constant according to the system frequency offset of the power system;

calculating a fourth sub-filtering time constant according to the frequency change rate of the power system, the system frequency offset and the wind power fluctuation;

calculating the fifth sub-filtering time constant according to the real-time charge state of the hybrid energy storage system;

calculating a sixth sub-filtering time constant according to the second output power of the hybrid energy storage system;

Calculate the sum of the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant to obtain the filtering time constant.

In a second aspect, the embodiments of the present application further provide a power fluctuation suppression and frequency modulation control device based on a hybrid energy storage system, including:

a first calculation module, configured to calculate the wind power fluctuation amount according to the collected first output power of the wind farm;

The second calculation module is configured to calculate according to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, and the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system, calculate the filtering time constant;

a first processing module, configured to perform high-pass filtering processing on the second output power by using the filtering time constant to obtain the third output power of the hybrid energy storage system;

The second processing module is configured to perform high-pass filtering processing on the third output power by using the filtering time constant to obtain the fourth output power of the battery in the hybrid energy storage system and the output power of the battery in the hybrid energy storage system. the fifth output power of the supercapacitor, so that the battery can simultaneously suppress the wind power fluctuation and control the wind power frequency modulation according to the fourth output power and the supercapacitor according to the fifth output power.

In a third aspect, embodiments of the present application further provide an energy processing system, the energy processing system is configured to execute the hybrid energy storage system-based power fluctuation suppression and frequency modulation control method according to any one of the first aspects, the The energy processing system includes: a wind power processing unit, a filtering time constant calculating unit, a high-pass filtering processing unit and a low-pass filtering processing unit;

The wind power processing unit calculates the wind power fluctuation amount according to the collected first output power of the wind farm, and sends the wind power fluctuation amount to the filter time constant calculation unit;

The filtering time constant calculation unit is based on the first output power of the wind farm, the fluctuation amount of the wind power, the system frequency offset of the power system, the frequency change rate of the power system, and the frequency of the hybrid energy storage system. The real-time charge state and the second output power of the hybrid energy storage system are calculated to obtain a filter time constant, and the filter time constant is sent to the high-pass filter processing unit;

The high-pass filter processing unit performs high-pass filter processing on the first output power of the wind farm according to the filter time constant to obtain the third output power of the hybrid energy storage system, and sends the third output power to the low-pass filtering processing unit;

The low-pass filtering processing unit performs low-pass filtering processing on the third output power according to the filtering time constant to obtain the fourth output power of the battery and the fifth output power of the super capacitor, so that all The battery simultaneously suppresses wind power fluctuation and controls wind power frequency modulation according to the fourth output power and the supercapacitor according to the fifth output power.

In a fourth aspect, embodiments of the present application further provide an electronic device, including: a processor, a memory, and a bus, where the memory stores machine-readable instructions executable by the processor, and when the electronic device runs, the processing A bus communicates between the processor and the memory, and when the machine-readable instructions are executed by the processor, the first aspect or the steps in any possible implementation manner of the first aspect are performed.

In a fourth aspect, the embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor to execute the first aspect, or any one of the first aspect. steps in one possible implementation.

An embodiment of the present application provides a power fluctuation suppression and frequency regulation control method based on a hybrid energy storage system, the hybrid energy storage system includes a battery and a super capacitor, the method is applied to an energy processing system, and the method includes: 1. Output power, calculate the wind power fluctuation amount; according to the first output power, wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system and the hybrid energy storage system The second output power of the system is calculated to obtain the filter time constant; the first output power is subjected to high-pass filtering processing using the filter time constant to obtain the third output power of the hybrid energy storage system; the third output power is obtained by using the preset filter time constant The power is subjected to low-pass filtering processing to obtain the fourth output power of the battery and the fifth output power of the supercapacitor, so that the battery can simultaneously suppress and control wind power fluctuations according to the fourth output power and the supercapacitor according to the fifth output power Wind power frequency modulation. In the embodiment of the present application, the filtering time constant is obtained by calculating various parameters collected, and the output power of each part of the hybrid energy storage system is calculated by the filtering time constant, which not only realizes the suppression of wind power fluctuations, but also realizes the control of wind power frequency regulation. control.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 shows a flowchart of a method for power fluctuation suppression and frequency modulation control based on a hybrid energy storage system provided by an embodiment of the present application;

FIG. 2 shows a schematic structural diagram of an energy processing system provided by an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a power fluctuation suppression and frequency modulation control device based on a hybrid energy storage system provided by an embodiment of the present application;

FIG. 4 shows a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

The embodiments of the present application provide a power fluctuation suppression and frequency modulation control method and device based on a hybrid energy storage system, which will be described below with reference to the embodiments.

In order to facilitate the understanding of this embodiment, a method for suppressing power fluctuation and controlling frequency regulation based on a hybrid energy storage system disclosed in the embodiment of this application is first introduced in detail.

In the embodiment of the present application, the hybrid energy storage system includes a battery and a supercapacitor, wherein the battery may be a battery, and the output power of the hybrid energy storage system is the sum of the output power of the battery and the output power of the supercapacitor.

As shown in Figure 1, the flow chart of a method for power fluctuation suppression and frequency regulation control based on a hybrid energy storage system includes the following steps:

S101: Calculate and obtain a wind power fluctuation amount according to the collected first output power of the wind farm.

When calculating the fluctuation amount of wind power, the output power P _WT (t) of the wind farm at time t and the output power P _WT (t-1) of the wind farm at time t-1 can be obtained, and time t-1 refers to t In the first 1 s of the time, the wind power fluctuation refers to the difference between the output power P _WT (t) of the wind farm at time t and the output power P _WT (t-1) of the wind farm at time t-1, that is, ΔP _WT =P _WT (t)-P _WT (t-1).

Before performing step S101, the first output power of the wind farm, the system frequency offset of the power system, the frequency change rate of the power system, and the real-time State of Charge (SOC) of the hybrid energy storage system may also be obtained. and the second output power of the hybrid energy storage system.

S102: Calculate according to the first output power, the fluctuation amount of wind power, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system, and the second output power of the hybrid energy storage system Filter time constant.

When calculating the filter time constant, it can be performed according to the following procedure:

(1) Calculate the first sub-filtering time constant τ _A according to the first output power, the second output power of the hybrid energy storage system, and the first preset time period.

Here, the first preset time period may be set to 30 minutes.

Specifically, it can be calculated by the following formula:

τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值；P_{30min_lim}表示电力系统要求的风电场30分钟内的功率变化最大限值；α表示为预留安全裕度而设立的系数，这里可根据要求或经验选取α的数值，一般可以设为80％-90％。Among them, A is the calculation coefficient of τ _A ,

τ ₀ is the initial value of the filter time constant, τ _min is the minimum value of the filter time constant determined according to historical data and energy storage configuration; P _{30min_lim} represents the maximum power change limit of the wind farm within 30 minutes required by the power system; α represents The coefficient established to reserve a safety margin, the value of α can be selected according to requirements or experience, and can generally be set to 80%-90%.

P _Gf is the sum of the first output power of the wind farm and the second output power of the hybrid energy storage system, namely P _Gf =P _WT +P _hess , P _WT is the first output power of the wind farm; P _hess is the hybrid energy storage system The second output power of the system; P _Gf (t) represents the value of P _Gf at time t.

ΔP _Gf-30min refers to the difference between the maximum value and the minimum value of P _Gf within 30 minutes; P _{max_30min} indicates the maximum value of P _Gf within 30 minutes, and P _{min_30min} indicates the minimum value of P _Gf within 30 minutes.

Therefore, it can be seen from the above formula that when the difference between the maximum value and the minimum value of P _Gf within 30 minutes is greater than the product of α and the maximum limit of power variation within 30 minutes of the wind farm and the maximum value of P _Gf within 30 minutes is the value of P _Gf at time t, or the difference between the maximum value and the minimum value of P _Gf within 30 minutes is greater than the product of α and the maximum limit of the power change of the wind farm within 30 minutes and the value of P _Gf within 30 minutes The minimum value is the value of P _Gf at time t, then the first sub-filtering time constant τ _A is the product of A and ΔP _Gf-30min .

In other cases, the first sub-filtering time constant τ _A is zero.

(2) Calculate the second sub-filtering time constant τ _B according to the first output power, the second output power of the hybrid energy storage system, and the second preset time period.

Here, the second preset time period can be set to be 1 minute, and the second preset time period is smaller than the first preset time period.

Specifically, it can be calculated by the following formula:

τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值；P_{1min_lim}表示电力系统要求的风电场1分钟内的功率变化最大限值，β表示为预留安全裕度而设立的系数，这里可根据要求或经验选取β的数值，一般可以设为80％-90％。where B is the calculation coefficient of τ _B ,

τ ₀ is the initial value of the filter time constant, τ _min is the minimum value of the filter time constant determined according to historical data and energy storage configuration; P _{1min_lim} represents the maximum power change limit of the wind farm within 1 minute required by the power system, and β represents The coefficient established to reserve a safety margin, the value of β can be selected according to requirements or experience, and can generally be set to 80%-90%.

P _Gf is the sum of the first output power of the wind farm and the second output power of the hybrid energy storage system, namely P _Gf =P _WT +P _hess , P _WT is the first output power of the wind farm; P _hess is the hybrid energy storage system The second output power of the system; P _Gf (t) represents the value of P _Gf at time t.

ΔP _Gf-1min refers to the difference between the maximum value and the minimum value of P _Gf within 1 minute; P _{max_1min} indicates the maximum value of P _Gf within 1 minute, and P _{max_1min} indicates the minimum value of P _Gf within 1 minute.

Therefore, it can be seen from the above formula that when the difference between the maximum value and the minimum value of P _Gf within 1 minute is greater than the product of β and the maximum limit of power variation within 1 minute of the wind farm and the maximum value of P _Gf within 1 minute is the value of P _Gf at time t, or the difference between the maximum value and the minimum value of P _Gf within 1 minute is greater than the product of β and the maximum limit of power variation within 1 minute of the wind farm and the value of P _Gf within 1 minute The minimum value is the value of P _Gf at time t, then the second sub-filtering time constant τ _B is the product of A and ΔP _Gf-1min .

In other cases, the second sub-filter time constant τ _B is zero.

(3) Calculate the third sub-filtering time constant τ _C according to the system frequency offset of the power system and the fluctuation of wind power.

Specifically, it can be calculated by the following formula:

计算，其中Δf_max表示达到最大调节能力时的系统频率偏移量，可根据电力系统的要求和经验选取；τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值。Among them, C is the calculation coefficient of τ _C , which can be selected or used according to historical data or experience.

calculation, where Δf _max represents the system frequency offset when the maximum regulation capacity is reached, which can be selected according to the requirements and experience of the power system; τ ₀ is the initial value of the filter time constant, and τ _min is determined according to historical data and energy storage configuration The minimum value of the filter time constant.

Δf represents the system frequency offset of the power system; ΔP _WT is the wind power fluctuation amount calculated in step S101 .

It can be seen from the above formula that when the product of the system frequency offset of the power system and the fluctuation amount of wind power is greater than zero, the third filter time constant is the positive value of the product of the absolute value of C and the system frequency offset of the power system; When the product of the system frequency offset of the power system and the fluctuation amount of wind power is less than zero, the third filter time constant is the negative value of the product of C and the absolute value of the system frequency offset of the power system.

(4) Calculate the fourth sub-filtering time constant τ _D according to the frequency change rate of the power system, the system frequency offset and the wind power fluctuation.

Specifically, it can be calculated by the following formula:

计算得到，其中

表示达到最大调节能力时的系统频率变化率，可根据电力系统的要求和经验选取；τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值。Among them, D is the calculation coefficient of τ _D , which can be selected or used according to historical data or experience.

calculated, where

Represents the system frequency change rate when the maximum regulation capacity is reached, which can be selected according to the requirements and experience of the power system; τ ₀ is the initial value of the filter time constant, and τ _min is the minimum value of the filter time constant determined according to historical data and energy storage configuration .

表示电力系统的系统频率变化率；Δf表示电力系统的系统频率偏移量；ΔP_WT为经过步骤S101计算得到的风电功率波动量。

represents the system frequency change rate of the power system; Δf represents the system frequency offset of the power system; ΔP _WT is the wind power fluctuation amount calculated in step S101 .

According to the above formula, when the product of the system frequency offset of the power system and the fluctuation amount of wind power is greater than zero, the fourth filter time constant is the positive value of the product of D and the absolute value of the system frequency change rate of the power system; when When the product of the system frequency offset of the power system and the fluctuation amount of wind power is less than zero, the third filter time constant is the negative value of the product of D and the absolute value of the system frequency change rate of the power system.

(5), according to the real-time charge state of the hybrid energy storage system, calculate the fifth sub-filtering time constant τ _E .

Specifically, it can be calculated by the following formula:

计算得到，其中soc_max和soc_min分别表示混合储能系统的荷电状态上下限；τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值；P_hess为混合储能系统的第二输出功率。Among them, E is the calculation coefficient of τ _E , which can be selected or used according to historical data or experience.

Calculated, where soc _max and soc _min respectively represent the upper and lower limits of the state of charge of the hybrid energy storage system; τ ₀ is the initial value of the filter time constant, and τ _min is the minimum value of the filter time constant determined according to historical data and energy storage configuration ; P _hess is the second output power of the hybrid energy storage system.

It can be seen from the above formula that when the second output power of the hybrid energy storage system is greater than zero, that is, when the hybrid energy storage system discharges, the fifth sub-filter time constant is a positive value of the product of E and (soc-0.5); The second output power of the energy system is less than zero, that is, when the hybrid energy storage system is charging, the fifth sub-filtering time constant is the negative value of the product of E and (soc-0.5).

(6) Calculate the sixth sub-filtering time constant τ _F according to the second output power of the hybrid energy storage system.

Specifically, it can be calculated by the following formula:

τ _F =F | P _hess |;

计算得到，其中P_{hess_max}表示混合储能系统输出功率的上限；τ₀为滤波时间常数初始值，τ_min为根据历史数据和储能配置而确定的滤波时间常数的最小值。Among them, F is the calculation coefficient of τ _F , which can be selected or used according to historical data or experience.

Calculated, where P _{hess_max} represents the upper limit of the output power of the hybrid energy storage system; τ ₀ is the initial value of the filter time constant, and τ _min is the minimum value of the filter time constant determined according to historical data and energy storage configuration.

It can be known from the above formula that the sixth sub-filtering time constant is the product of F and the absolute value of the output power of the hybrid energy storage system.

Finally, the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant obtained according to (1)-(6) Filter time constant, calculate the filter time constant.

Specifically, the filtering time constant can be calculated according to τ ₁ =τ ₀ +τ _A +τ _B +τ _C +τ _D +τ _E +τ _F , where τ ₁ is the filtering time constant, and τ ₀ is the initial value of the filtering time constant .

S103: Using the filtering time constant, perform high-pass filtering processing on the first output power to obtain the third output power of the hybrid energy storage system.

The third output power of the hybrid energy storage system refers to the sum of the output power of the battery and the output power of the supercapacitor.

S104: Using a preset filter time constant, perform low-pass filtering processing on the third output power to obtain the fourth output power of the battery and the fifth output power of the supercapacitor, so that the fourth output power of the battery and the fifth output power of the supercapacitor are obtained according to the fifth output power of the battery. The output power simultaneously suppresses wind power fluctuations and controls wind power frequency modulation.

The preset filtering time constant may be determined according to the specific configuration and historical data of the battery energy storage and the supercapacitor energy storage. The preset filter time constant may be a different value from the filter time constant obtained in step S102.

The battery absorbs or generates power according to the fourth output power, and the supercapacitor absorbs or generates power according to the fifth output power, the battery and the supercapacitor work at the same time to achieve simultaneous suppression of wind power fluctuations, and the battery can control the third output power. The low frequency part can control the wind power frequency modulation; the super capacitor can control the high frequency part of the third output power, so as to control the wind power frequency modulation.

Embodiments of the present application further provide an energy processing system, which is used for implementing the above-mentioned method for suppressing power fluctuation and controlling frequency based on a hybrid energy storage system.

In the schematic structural diagram of the energy processing system shown in FIG. 2, the energy processing system includes: a wind power processing unit 201, a filtering time constant calculating unit 202, a high-pass filtering processing unit 203, and a low-pass filtering processing unit 204;

The wind power processing unit 201 calculates and obtains the wind power fluctuation amount according to the collected first output power of the wind farm, and sends the wind power power fluctuation amount to the filter time constant calculation unit 202;

The filter time constant calculation unit 202 calculates the value according to the first output power of the wind farm, the fluctuation amount of wind power, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system, and the value of the hybrid energy storage system. The second output power is calculated to obtain the filter time constant, and the filter time constant is sent to the high-pass filter processing unit 203;

The high-pass filter processing unit 203 performs high-pass filter processing on the first output power of the wind farm according to the filtering time constant to obtain the third output power of the hybrid energy storage system, and sends the third output power to the low-pass filter processing unit 204;

The low-pass filtering processing unit 204 performs low-pass filtering processing on the third output power according to the preset filtering time constant to obtain the fourth output power of the battery and the fifth output power of the super capacitor, so that the battery can obtain the fourth output power and the super capacitor according to the fourth output power and the super capacitor. The capacitor simultaneously suppresses wind power fluctuations and controls wind power frequency modulation according to the fifth output power.

Based on the same technical concept, the embodiments of the present application also provide a power fluctuation suppression and frequency modulation control device, electronic equipment, and computer-readable storage medium based on a hybrid energy storage system. For details, refer to the following embodiments.

3 is a block diagram illustrating a power fluctuation suppression and frequency regulation control device based on a hybrid energy storage system according to some embodiments of the present application, the functions implemented by the hybrid energy storage system based power fluctuation suppression and frequency regulation control device correspond to the above-mentioned functions in the terminal device Steps of performing power fluctuation suppression and frequency regulation control method based on hybrid energy storage system above. The device can be understood as a component of a server including a processor, and the component can implement the above-mentioned power fluctuation suppression and frequency regulation control method based on the hybrid energy storage system. As shown in FIG. 3 , the power fluctuation suppression and frequency regulation control method based on the hybrid energy storage system The FM control device may include:

The first calculation module 301 is configured to calculate the wind power fluctuation amount according to the collected first output power of the wind farm;

The second calculation module 302 is configured to calculate according to the first output power, the fluctuation amount of the wind power, the system frequency offset of the power system, the frequency change rate of the power system, and the real-time charge of the hybrid energy storage system state and the second output power of the hybrid energy storage system, the filtering time constant is obtained by calculation;

a first processing module 303, configured to perform high-pass filtering processing on the second output power by using the filtering time constant to obtain the third output power of the hybrid energy storage system;

The second processing module 304 is configured to perform high-pass filtering processing on the third output power by using a preset filter time constant to obtain the fourth output power of the battery in the hybrid energy storage system and the output power of the battery in the hybrid energy storage system the fifth output power of the supercapacitor, so that the battery can simultaneously suppress the wind power fluctuation and control the wind power frequency modulation according to the fourth output power and the supercapacitor according to the fifth output power.

In the specific implementation process, it also includes:

a first acquisition module, configured to acquire the first output power of the wind farm, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system and the hybrid energy storage system The second output power of the system.

In a specific implementation process, the first calculation module 301 includes:

a second obtaining module, configured to obtain the first output power P _WT (t) of the wind farm at time t and the first output power P _WT (t-1) of the wind farm at time t-1;

The third calculation module is configured to calculate the difference between the first output power P _WT (t) of the wind farm at the time t and the first output power P _WT (t-1) of the wind farm at the time t-1 , the wind power fluctuation amount ΔP _WT is obtained.

As shown in FIG. 4, which is a schematic structural diagram of an electronic device 400 provided by an embodiment of the application, the electronic device 400 includes: at least one processor 401, at least one network interface 404 and at least one user interface 403, a memory 405, At least one communication bus 402 . The communication bus 402 is used to implement the connection communication between these components. The user interface 403 includes a display (eg, a touch screen), a keyboard, or a pointing device (eg, a touch pad or a touch screen, etc.).

Memory 405 may include read-only memory and random access memory, and provides instructions and data to processor 401 . A portion of memory 405 may also include non-volatile random access memory (NVRAM).

In some embodiments, memory 405 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

The operating system 4051 contains various system programs for implementing various basic services and processing hardware-based tasks;

The application program 4052 includes various application programs for implementing various application services.

In this embodiment of the present application, by calling the program or instruction stored in the memory 405, the processor 401 is used to:

According to the collected first output power of the wind farm, the fluctuation amount of wind power is calculated and obtained;

According to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system and the hybrid energy storage system The second output power of , the filter time constant is obtained by calculation;

Using the filtering time constant, high-pass filtering is performed on the first output power to obtain the third output power of the hybrid energy storage system;

Using a preset filter time constant, low-pass filtering is performed on the third output power to obtain the fourth output power of the battery and the fifth output power of the supercapacitor, so that the The fourth output power and the super capacitor simultaneously suppress wind power fluctuation and control wind power frequency modulation according to the fifth output power.

In a feasible implementation manner, the processor 401 is further configured to:

The first output power of the wind farm, the system frequency offset of the power system, the frequency change rate of the power system, the real-time state of charge of the hybrid energy storage system, and the second output power of the hybrid energy storage system are acquired.

In a feasible implementation manner, the processor 401 is further configured to:

obtaining the first output power P _WT (t) of the wind farm at time t, and the first output power P _WT (t-1) of the wind farm at time t-1;

Calculate the difference between the first output power P _WT (t) of the wind farm at the time t and the first output power P _WT (t-1) of the wind farm at the time t-1 to obtain the wind power fluctuation amount ΔP _WT .

In a feasible implementation manner, the processor 401 is further configured to:

calculating a first sub-filtering time constant according to the first output power, the second output power of the hybrid energy storage system and the first preset time period;

calculating a second sub-filtering time constant according to the first output power, the second output power of the hybrid energy storage system, and a second preset time period;

calculating a third sub-filtering time constant according to the system frequency offset of the power system and the wind power fluctuation;

calculating a fourth sub-filtering time constant according to the frequency change rate of the power system;

calculating the fifth sub-filtering time constant according to the real-time charge state of the hybrid energy storage system;

calculating a sixth sub-filtering time constant according to the second output power of the hybrid energy storage system;

According to the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant, the filtering time constant is obtained by calculating .

The computer program product for performing the power fluctuation suppression and frequency modulation control method based on the hybrid energy storage system provided by the embodiments of the present application includes a computer-readable storage medium storing a non-volatile program code executable by a processor, and the program The instructions included in the code can be used to execute the methods described in the foregoing method embodiments. For specific implementation, reference may be made to the method embodiments, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. The apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-executable non-volatile computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present application, and are used to illustrate the technical solutions of the present application, rather than limit them. The embodiments describe the application in detail, and those of ordinary skill in the art should understand that: any person skilled in the art can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the application. Or can easily think of changes, or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the application, and should be covered in this application. within the scope of protection. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (9)

1. A power fluctuation suppression and frequency modulation control method based on a hybrid energy storage system, wherein the hybrid energy storage system comprises a battery and a super capacitor, and the method is applied to an energy processing system and comprises the following steps:

calculating to obtain the fluctuation amount of the wind power according to the collected first output power of the wind power plant;

calculating to obtain a filtering time constant according to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system;

carrying out high-pass filtering processing on the first output power by using the filtering time constant to obtain third output power of the hybrid energy storage system;

performing low-pass filtering processing on the third output power by using a preset filtering time constant to obtain fourth output power of the battery and fifth output power of the super capacitor, so that the battery simultaneously inhibits wind power fluctuation and controls wind power frequency modulation according to the fourth output power and the fifth output power of the super capacitor;

calculating to obtain a filtering time constant according to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system, and including:

calculating a first sub-filtering time constant according to the first output power, the second output power of the hybrid energy storage system and a first preset time period;

calculating a second sub-filtering time constant according to the first output power, a second output power of the hybrid energy storage system and a second preset time period;

calculating a third sub-filtering time constant according to the system frequency offset of the power system and the wind power fluctuation amount;

calculating a fourth sub-filtering time constant according to the frequency change rate of the power system, the system frequency offset and the wind power fluctuation amount;

calculating a fifth sub-filtering time constant according to the real-time charge state of the hybrid energy storage system;

calculating a sixth sub-filtering time constant according to the second output power of the hybrid energy storage system;

and calculating to obtain a filtering time constant according to the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant.

2. The power fluctuation suppression and frequency modulation control method based on the hybrid energy storage system according to claim 1, before calculating the wind power fluctuation amount according to the collected first output power of the wind farm, further comprising:

the method comprises the steps of obtaining first output power of a wind power plant, system frequency offset of a power system, frequency change rate of the power system, real-time charge state of the hybrid energy storage system and second output power of the hybrid energy storage system.

3. The power fluctuation suppression and frequency modulation control method based on the hybrid energy storage system according to claim 1, wherein the step of calculating the wind power fluctuation amount according to the collected first output power of the wind farm comprises:

obtaining first output power P of wind power plant at time t_WT(t), and a first output power P of the wind farm at time t-1_WT(t-1)；

Calculating first output power P of the wind power plant at the time t_WT(t) first output power P of wind farm at the time t-1_WT(t-1) to obtain the wind power fluctuation quantity delta P_WT。

4. A power fluctuation suppression and frequency modulation control device based on a hybrid energy storage system is characterized by comprising:

the first calculation module is used for calculating to obtain the fluctuation quantity of the wind power according to the collected first output power of the wind power plant;

the second calculation module is used for calculating a filtering time constant according to the first output power, the wind power fluctuation amount, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system;

the first processing module is used for performing high-pass filtering processing on the second output power by using the filtering time constant to obtain third output power of the hybrid energy storage system;

the second processing module is used for performing high-pass filtering processing on the third output power by using a preset filtering time constant to obtain fourth output power of a battery in the hybrid energy storage system and fifth output power of a super capacitor in the hybrid energy storage system, so that the battery simultaneously inhibits wind power fluctuation and controls wind power frequency modulation according to the fourth output power and the super capacitor according to the fifth output power;

the second calculation module is specifically configured to:

calculating a first sub-filtering time constant according to the first output power, the second output power of the hybrid energy storage system and a first preset time period;

calculating a second sub-filtering time constant according to the first output power, a second output power of the hybrid energy storage system and a second preset time period;

calculating a third sub-filtering time constant according to the system frequency offset of the power system and the wind power fluctuation amount;

calculating a fourth sub-filtering time constant according to the frequency change rate of the power system, the system frequency offset and the wind power fluctuation amount;

calculating a fifth sub-filtering time constant according to the real-time charge state of the hybrid energy storage system;

calculating a sixth sub-filtering time constant according to the second output power of the hybrid energy storage system;

and calculating to obtain a filtering time constant according to the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant.

5. The hybrid energy storage system based power fluctuation suppression and frequency modulation control apparatus of claim 4, further comprising:

the system comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining first output power of a wind power plant, system frequency offset of a power system, frequency change rate of the power system, real-time charge state of the hybrid energy storage system and second output power of the hybrid energy storage system.

6. The hybrid energy storage system based power fluctuation suppression and frequency modulation control apparatus of claim 4, wherein the first calculation module comprises:

a second obtaining module, configured to obtain first output power P of the wind farm at time t_WT(t), and a first output power P of the wind farm at time t-1_WT(t-1)；

A third calculation module for calculating the first output power P of the wind farm at the time t_WT(t) first output power P of wind farm at the time t-1_WT(t-1) to obtain the wind power fluctuation quantity delta P_WT。

7. An energy processing system for performing the hybrid energy storage system based power fluctuation suppression and frequency modulation control method according to any one of claims 1 to 3, the energy processing system comprising: the wind power processing unit, the filtering time constant calculating unit, the high-pass filtering processing unit and the low-pass filtering processing unit;

the wind power processing unit calculates to obtain a wind power fluctuation amount according to the collected first output power of the wind power plant, and sends the wind power fluctuation amount to the filtering time constant calculating unit;

the filtering time constant calculation unit calculates a filtering time constant according to the first output power of the wind power plant, the fluctuation amount of the wind power, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system, and sends the filtering time constant to the high-pass filtering processing unit;

the high-pass filtering processing unit is used for carrying out high-pass filtering processing on the first output power of the wind power plant according to the filtering time constant to obtain third output power of the hybrid energy storage system, and the third output power is sent to the low-pass filtering processing unit;

the low-pass filtering processing unit performs low-pass filtering processing on the third output power according to a preset filtering time constant to obtain fourth output power of the battery and fifth output power of the super capacitor, so that the battery can simultaneously restrain wind power fluctuation and control wind power frequency modulation according to the fourth output power and the fifth output power of the super capacitor;

the filtering time constant calculation unit calculates a filtering time constant according to the first output power of the wind power plant, the fluctuation amount of the wind power, the system frequency offset of the power system, the frequency change rate of the power system, the real-time charge state of the hybrid energy storage system and the second output power of the hybrid energy storage system, and includes:

the filtering time constant calculating unit calculates a first sub-filtering time constant according to the first output power, the second output power of the hybrid energy storage system and a first preset time period;

the filtering time constant calculating unit calculates a second sub-filtering time constant according to the first output power, a second output power of the hybrid energy storage system and a second preset time period;

the filtering time constant calculating unit calculates a third sub-filtering time constant according to the system frequency offset of the power system and the wind power fluctuation amount;

the filtering time constant calculating unit calculates a fourth sub-filtering time constant according to the frequency change rate of the power system, the system frequency offset and the wind power fluctuation amount;

the filtering time constant calculating unit calculates a fifth sub-filtering time constant according to the real-time charge state of the hybrid energy storage system;

the filtering time constant calculating unit calculates a sixth sub-filtering time constant according to the second output power of the hybrid energy storage system;

and the filtering time constant calculation unit calculates and obtains a filtering time constant according to the first sub-filtering time constant, the second sub-filtering time constant, the third sub-filtering time constant, the fourth sub-filtering time constant, the fifth sub-filtering time constant and the sixth sub-filtering time constant.

8. An electronic device, comprising: a processor, a memory and a bus, the memory storing machine readable instructions executable by the processor, the processor and the memory communicating via the bus when an electronic device is running, the machine readable instructions when executed by the processor performing the steps of the hybrid energy storage system based power fluctuation suppression and frequency modulation control method according to any one of claims 1 to 3.

9. A computer-readable storage medium, having stored thereon a computer program for executing the steps of the method for hybrid energy storage system based power fluctuation suppression and frequency modulation control according to any one of claims 1 to 3 when being executed by a processor.

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