Electric hydrogen production load participated power grid interaction control method and device

Abstract

The invention provides an electric hydrogen production load participation power grid interaction control method and device, and relates to the technical field of power system operation and control. The method comprises the following steps: based on load voltage-power coupling characteristics, establishing a CVR coefficient model of an electrical hydrogen production load, and identifying a CVR coefficient of the electrical hydrogen production load; introducing an electrical hydrogen production load feedback link on the basis of the classical frequency response model, establishing an electrical hydrogen production load frequency response model, and solving a negative feedback coefficient of the electrical hydrogen production load participating in system frequency adjustment on the basis of the electrical hydrogen production load frequency response model; and under the condition of system frequency disturbance, obtaining an amplification coefficient of electric hydrogen production load bus voltage frequency feedback control according to the CVR coefficient and the negative feedback coefficient, establishing a feedback adjustment coefficient controller based on the amplification coefficient, and realizing participation of the electric hydrogen production load in power grid frequency modulation through the feedback adjustment coefficient controller. When power disturbance occurs in the system, the electric hydrogen production load participates in power grid frequency modulation, and the stability of the system frequency is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system operation and control, in particular to a method and device for hydrogen production load participating in power grid interaction control. BACKGROUND

[0002] With the rapid development of social economy, the demand for electricity in China is also growing. However, the traditional power supply mode has been unable to meet this demand. In order to promote the transformation and upgrading of the power system and adapt to the carbon neutralization target, China has begun to strive to increase the installed capacity of new energy. Due to the volatility and uncertainty of new energy, the continuous increase of its penetration rate will lead to the increase of source-load uncertainty in the system, the further widening of the load peak-valley difference, and the intensification of the power grid power balance risk. However, the regulation capacity of the power supply side is limited, and when the adjustable capacity of the power grid is insufficient, the system frequency cannot be maintained within the required safe operating range, and the traditional operation mode cannot meet the stability requirements of the power system.

[0003] Currently, the regulation of load resources mainly focuses on small-capacity and distributed objects such as electric vehicles and temperature control loads, which is not conducive to the unified regulation of the power dispatching center. Hydrogen production load has the characteristics of large power capacity, fast regulation speed, easy transformation, and short-term regulation without affecting production safety, and has great power regulation potential. There is no effective method for hydrogen production load to participate in power grid frequency regulation. How to establish a corresponding hydrogen production load frequency response model according to the power disturbance in the system and realize system frequency stability based on this is a problem that needs to be solved for hydrogen production load to participate in demand response. SUMMARY

[0004] The purpose of the present application is to provide a method and device for hydrogen production load participating in power grid interaction control, which solves the problem of how to establish a corresponding hydrogen production load frequency response model according to the power disturbance in the system and realize system frequency stability, etc. By establishing a hydrogen production load frequency response model, the hydrogen production load can participate in power grid demand response while ensuring system frequency stability.

[0005] In order to achieve the above purpose, in the first aspect, the present application provides a method for hydrogen production load participating in power grid interaction control, comprising: Based on the load voltage-power coupling characteristics, a CVR coefficient model of the hydrogen production load is established, and the CVR coefficient of the hydrogen production load is identified; A hydrogen production load feedback link is introduced based on the classical frequency response model to establish a hydrogen production load frequency response model, and the negative feedback coefficient of the hydrogen production load participating in system frequency regulation is solved based on the hydrogen production load frequency response model; The amplification coefficient of the frequency feedback control of the hydrogen production load bus voltage is obtained according to the CVR coefficient and the negative feedback coefficient in the case of being disturbed by the system frequency, the feedback adjustment coefficient controller is established based on the amplification coefficient, and the hydrogen production load participates in the frequency modulation of the power grid through the feedback adjustment coefficient controller.

[0006] According to the method, the CVR coefficient model of the hydrogen production load is established based on the load voltage-power coupling characteristic, and the CVR coefficient of the hydrogen production load is identified, and the method comprises the steps of: The CVR coefficient model is established based on the ZIP load characteristic model; The ZIP load characteristic model is as follows: (1) In the formula, P is the active power of the load, P0 is the rated active power, V is the actual voltage, V0 is the rated voltage, p1, p2 and p3 are the percentages of the constant impedance load, the constant current load and the constant power load in the total active power load respectively; The CVR coefficient model is as follows: (2) In the formula, CVR fac The CVR coefficient is ΔV, the voltage response change of the hydrogen production load bus is ΔP, and the power change of the hydrogen production load is ΔP.

[0007] According to the method, the classical frequency response model is established according to the synchronous motor, and the expression is as follows:

[0008] In the formula, H is the inertia time constant of the synchronous motor, D is the damping constant of the synchronous motor, K m The gain factor of the input mechanical power is F H The proportion of the power generated by the reheat steam turbine in the total power is T R The reheat time constant of the reheat steam turbine is R, the droop control coefficient of the synchronous motor is Δ f The system frequency deviation is P S The frequency modulation disturbance power is s, and the Laplace operator is s.

[0009] According to the method, the negative feedback coefficient of the hydrogen production load participating in the system frequency regulation is solved based on the frequency response model of the hydrogen production load, and the method comprises the steps of: Based on the frequency response model of the hydrogen production load, the frequency modulation disturbance power at t is obtained through mathematical derivation P S ​t The time-domain expression for the system frequency deviation; the extreme value of the system frequency deviation is the preset value Δ. f m When the system frequency is used as the control target, the extreme points are obtained based on the time-domain expression of the system frequency deviation. t m This leads to the negative feedback coefficient.

[0010] According to the present invention, a method for participating in grid interaction control of electrically generated hydrogen loads is provided, wherein the time-domain expression of the system frequency deviation is: (3) Where α and These are the amplitude and phase correction coefficients of the transient response, respectively; ω d ω is the damped oscillation angular frequency. n ζ is the system's natural angular frequency; ζ is the system's damping ratio; where,

[0011]

[0012] .

[0013] According to the present invention, a method for participating in grid interaction control of electrically generated hydrogen load is provided, wherein the negative feedback coefficient is: (4).

[0014] According to the present invention, a method for participating in grid interaction control of electrically generated hydrogen load is provided, with an amplification factor of: (5).

[0015] According to the present invention, a method for controlling the participation of electrically generated hydrogen loads in grid interaction is provided, which establishes a feedback regulation coefficient controller based on an amplification factor, and realizes the participation of electrically generated hydrogen loads in grid frequency regulation through the feedback regulation coefficient controller, including: Under system frequency disturbance, the change in voltage response ΔV of the electric hydrogen production load bus is related to the system frequency deviation ΔV. f The relation is: ΔV= K C Δ f The deviation between the current frequency and the rated frequency of the real-time measurement system, i.e. the system frequency deviation, is adjusted by the feedback regulation coefficient controller according to the amplification factor to adjust the bus voltage of the electric hydrogen production load, thereby adjusting the active power of the electric hydrogen production load and enabling the electric hydrogen production load to participate in the grid frequency regulation.

[0016] The feedback regulation coefficient controller comprises a static reactive power compensator or a dynamic voltage regulator.

[0017] In a second aspect, the application provides an electric hydrogen production load interactive power grid control device, comprising: The identification unit is configured to establish a CVR coefficient model of the electric hydrogen production load based on a load voltage-power coupling characteristic, and identify a CVR coefficient of the electric hydrogen production load. The solving unit is configured to introduce a feedback link of the electric hydrogen production load into a classical frequency response model, establish an electric hydrogen production load frequency response model, and solve a negative feedback coefficient of the electric hydrogen production load participating in system frequency regulation based on the electric hydrogen production load frequency response model. The control unit is configured to obtain an amplification coefficient of electric hydrogen production load bus voltage frequency feedback control according to the CVR coefficient and the negative feedback coefficient in the case of system frequency disturbance, establish a feedback regulation coefficient controller based on the amplification coefficient, and realize the electric hydrogen production load participating in power grid frequency modulation through the feedback regulation coefficient controller.

[0018] The application has at least the following technical effects: The application provides an electric hydrogen production load interactive power grid control method and device, which comprises the following steps: establishing a CVR coefficient model of the electric hydrogen production load based on a load voltage-power coupling characteristic, and identifying a CVR coefficient of the electric hydrogen production load; introducing a feedback link of the electric hydrogen production load into a classical frequency response model, establishing an electric hydrogen production load frequency response model, and solving a negative feedback coefficient of the electric hydrogen production load participating in system frequency regulation based on the electric hydrogen production load frequency response model; obtaining an amplification coefficient of electric hydrogen production load bus voltage frequency feedback control according to the CVR coefficient and the negative feedback coefficient in the case of system frequency disturbance, establishing a feedback regulation coefficient controller based on the amplification coefficient, and realizing the electric hydrogen production load participating in power grid frequency modulation through the feedback regulation coefficient controller. The application introduces a feedback link of the electric hydrogen production load into a classical frequency response model to establish a frequency response model, so that the electric hydrogen production load can participate in power grid frequency modulation and ensure the stability of system frequency when power disturbance occurs in the system. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0020] In the drawings: Figure 1 It is a structural schematic diagram of the classical frequency response model of the application. Figure 2 The structural schematic diagram of the load frequency response model of the electric hydrogen production is shown in the figure. Figure 3 The principle schematic diagram of the bus voltage regulation realized by the feedback adjustment coefficient controller is shown in the figure. Figure 4 The flowchart of the method for the electric hydrogen production load to participate in the interactive control of the power grid is shown in the figure. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0022] Some embodiments of the present application will be described in detail below in combination with the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Please refer to Figure 4 The embodiment of the present application provides a method for the electric hydrogen production load to participate in the interactive control of the power grid by studying the load power regulation characteristics of the electric hydrogen production load, and includes the following steps. Step 1, based on the load voltage-power coupling characteristics, a CVR coefficient model of the electric hydrogen production load is established, and the CVR coefficient of the electric hydrogen production load is identified. Specifically, based on the universally existing load voltage-power coupling characteristics, for example, the ZIP load characteristic model as shown in formula (1), a CVR (conservation voltage reduction) coefficient model as shown in formula (2) is established. (1) In the formula, P is the active power of the load, P0 is the rated active power, V is the actual voltage, V0 is the rated voltage; p1, p2 and p3 are respectively the percentage of the constant impedance load, the constant current load and the constant power load in the total active power load, collectively referred to as the load static model coefficient.

[0024] (2) In the formula, CVR fac is the CVR coefficient; ΔV is the feeder voltage variation, i.e. the bus voltage response variation of the electric hydrogen production load; ΔP is the corresponding feeder load power variation, i.e. the power variation of the electric hydrogen production load.

[0025] It should be noted that based on the established CVR coefficient model, the CVR coefficient of the hydrogen production load can be calculated: first, the research object is pushed out of the local AVC control (automatic voltage control), then the OLTC (on-load voltage regulating transformer) is adjusted, the data is retrieved from the SCADA (data acquisition and monitoring control system) and preprocessed, and finally the CVR coefficient is calculated by ΔV and ΔP.

[0026] Step 2, introduce the hydrogen production load feedback link based on the classical frequency response model, establish the hydrogen production load frequency response model, and solve the negative feedback coefficient of the hydrogen production load participating in the system frequency regulation based on the hydrogen production load frequency response model; Specifically, according to the structure of a typical synchronous motor power device, a classical frequency response model can be constructed as shown in Figure 1 The expression of the classical frequency response model is:

[0027] In the formula, H is the inertia time constant of the synchronous motor, D is the damping constant of the synchronous motor, K m is the gain factor of the input mechanical power, F H is the proportion of the power generated by the reheat steam turbine to the total power, T R is the reheat time constant of the reheat steam turbine, R is the droop control coefficient of the synchronous motor, and these parameters depend on the structure and working mode of the synchronous motor; Δ f is the system frequency deviation, P S is the frequency modulation disturbance power, s is the Laplace operator.

[0028] On this basis, the hydrogen production load feedback link is introduced, that is, the complete hydrogen production load frequency response model is constructed as shown in Figure 2 . Figure 1 and Figure 2 In the formula, P S is the frequency modulation disturbance power in the system, P a is the acceleration power of the synchronous motor; Δω is the angular frequency change, which is proportional to the system frequency deviation Δ f ; P m is the mechanical power adjustment value, P E is the hydrogen production load adjustment power. K E is the introduced negative feedback coefficient of the hydrogen production load participating in the system frequency regulation.

[0029] Based on the foregoing hydrogen production load frequency response model, through mathematical derivation, it can be obtained that when the frequency modulation disturbance power at time t is P S ( t ), the time domain expression of the system frequency deviation is: (3) wherein a and are the amplitude and phase correction coefficients of the transient response respectively,

[0030] ω d is the damped oscillation angular frequency, ω n is the natural oscillation angular frequency of the system,

[0031] ζ is the damping ratio of the system, which determines the oscillation decay rate of the frequency,

[0032] Considering the national power system safety and stability control technology guide, the system frequency deviation in the normal operation of the power system should not be greater than 0.5 Hz, that is, the extreme value of the system frequency deviation is the preset value =0.5 Hz, and the extreme point is obtained according to the time domain expression of the system frequency deviation , that is, the negative feedback coefficient of the electric hydrogen load participating in the system frequency regulation can be obtained from equation (3): (4) Therefore, according to the maximum power value of the primary frequency modulation disturbance and the maximum frequency deviation value, the feedback regulation coefficient K E of the electric hydrogen load can be calculated. It should be understood that the values of other parameters in the foregoing formula can be identified by the prior art, and the present application only considers the primary frequency modulation disturbance.

[0033] Step 3, under the condition of system frequency disturbance, the amplification coefficient of the electric hydrogen load bus voltage frequency feedback control is obtained according to the CVR coefficient and the negative feedback coefficient, the feedback regulation coefficient controller is established based on the amplification coefficient, and the electric hydrogen load participates in the grid frequency modulation through the feedback regulation coefficient controller.

[0034] Specifically, under the condition of system frequency disturbance, the relationship between the electric hydrogen load bus voltage response change ΔV and the system frequency deviation Δ f is: ΔV= K C Δ f The amplification coefficient K C can be obtained by equation (5): (5) The amplification coefficient K CA feedback regulation coefficient controller can be established, which can be realized by power electronic devices for regulating bus voltage, such as static var compensator (SVC), dynamic voltage regulator (DVR) and the like, and a schematic diagram of the realization principle is shown in Figure 3 , Figure 3 The power of the node i is The rated frequency and voltage of the node i are The power of the node i is The rated frequency and voltage of the node i are

[0035] The deviation between the current frequency of the system and the rated frequency, i.e. the system frequency deviation, is measured in real time, and the amplification coefficient K C The bus voltage of the hydrogen production load is regulated, so that the active power of the hydrogen production load is regulated, and the hydrogen production load participates in the frequency regulation of the power grid.

[0036] Based on the same inventive concept, another embodiment of the present application provides an interactive control device for the hydrogen production load participating in the power grid, which corresponds to the method of the foregoing embodiment, and the device comprises: The identification unit is configured to establish a CVR coefficient model of the hydrogen production load based on the load voltage-power coupling characteristic, and identify the CVR coefficient of the hydrogen production load; The solving unit is configured to introduce a feedback link of the hydrogen production load into a classical frequency response model, establish a frequency response model of the hydrogen production load, and solve a negative feedback coefficient of the hydrogen production load participating in the system frequency regulation based on the frequency response model of the hydrogen production load; The control unit is configured to obtain an amplification coefficient of the frequency feedback control of the bus voltage of the hydrogen production load according to the CVR coefficient and the negative feedback coefficient in the case of being subjected to the system frequency disturbance, establish a feedback regulation coefficient controller based on the amplification coefficient, and realize the hydrogen production load participating in the frequency regulation of the power grid through the feedback regulation coefficient controller.

[0037] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the general inventive concepts described herein and including all technical equivalents or substitutions of elements taught from the disclosure. It is to be understood that the application is not to be limited to the exact construction described and that various modifications and changes can be made thereto without departing from the scope thereof. The scope of the application is limited only by the claims that follow.

Claims

1. A method for interactive control of electric hydrogen production load participating in power grid, characterized in that, include: Based on the load voltage-power coupling characteristics, a CVR coefficient model for the electric hydrogen production load is established, and the CVR coefficient of the electric hydrogen production load is identified. Based on the classical frequency response model, an electric hydrogen production load feedback loop is introduced to establish an electric hydrogen production load frequency response model. Based on the electric hydrogen production load frequency response model, the negative feedback coefficient of the electric hydrogen production load participating in the system frequency regulation is solved. Under the condition of system frequency disturbance, the amplification factor of the voltage frequency feedback control of the electric hydrogen production load bus is obtained according to the CVR coefficient and the negative feedback coefficient. A feedback regulation coefficient controller is established based on the amplification factor, and the electric hydrogen production load participates in grid frequency regulation through the feedback regulation coefficient controller.

2. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 1, characterized in that, The CVR coefficient model for the electric hydrogen production load is established based on the load voltage-power coupling characteristics, and the CVR coefficient of the electric hydrogen production load is identified, including: The CVR coefficient model is established based on the ZIP load characteristic model; The ZIP load characteristic model is as follows: （1） In the formula, P is the active power of the load, P0 is the rated active power, V is the actual voltage, V0 is the rated voltage, and p1, p2, and p3 are the percentages of constant impedance load, constant current load, and constant power load to the total active power load, respectively. The CVR coefficient model is as follows: （2） In the formula, CVR fac ΔV is the CVR coefficient, ΔV is the change in voltage response of the electric hydrogen production load bus, and ΔP is the change in power of the electric hydrogen production load.

3. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 2, characterized in that, Based on the synchronous motor, the classical frequency response model is constructed, and its expression is: In the formula, H is the inertial time constant of the synchronous motor, and D is the damping constant of the synchronous motor. K m F is the gain factor of the input mechanical power. H T represents the proportion of power generated by the reheat turbine to the total power. R R is the reheat time constant of the reheat turbine, R is the synchronous motor droop control coefficient, and Δ is the reheat time constant. f For the system frequency deviation, P S Let be the frequency modulation disturbance power, and s be the Laplace operator.

4. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 3, characterized in that, Based on the frequency response model of the electric hydrogen production load, the negative feedback coefficients for the electric hydrogen production load's participation in system frequency regulation are solved, including: Based on the aforementioned frequency response model of the electric hydrogen production load, the frequency modulation disturbance power at time t is obtained through mathematical derivation as follows: P S ( t The time-domain expression for the system frequency deviation; the extreme value of the system frequency deviation is the preset value Δ. f m When the system frequency is used as the control target, the extreme points are obtained based on the time-domain expression of the system frequency deviation. t m Thus, the negative feedback coefficient is obtained.

5. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 4, characterized in that, The time-domain expression for the system frequency deviation is: （3） Where α and These are the amplitude and phase correction coefficients of the transient response, respectively; ω d ω is the damped oscillation angular frequency. n ζ is the system's natural angular frequency; ζ is the system's damping ratio; where, 。 6. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 4, characterized in that, The negative feedback coefficient is: （4）。 7. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 6, characterized in that, The amplification factor is: （5）。 8. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 7, characterized in that, A feedback regulation coefficient controller is established based on the amplification factor, and the participation of the electrically generated hydrogen load in grid frequency regulation is achieved through the feedback regulation coefficient controller, including: Under system frequency disturbance, the change in voltage response ΔV of the electric hydrogen production load bus is related to the system frequency deviation ΔV. f The relation is: ΔV= K C D f The deviation between the current frequency and the rated frequency of the real-time measurement system, i.e. the system frequency deviation, is adjusted by the feedback adjustment coefficient controller according to the amplification factor, thereby adjusting the active power of the electric hydrogen production load and enabling the electric hydrogen production load to participate in grid frequency regulation.

9. The method for participating in grid interaction control of electrically generated hydrogen load according to claim 1, characterized in that, The feedback regulation coefficient controller includes a static var compensator or a dynamic voltage regulator.

10. A device for controlling the interaction of electrically generated hydrogen loads with the power grid, characterized in that, include: The identification unit is used to establish a CVR coefficient model for the electric hydrogen production load based on the load voltage-power coupling characteristics, and to identify the CVR coefficient of the electric hydrogen production load. The solution unit is used to introduce an electric hydrogen production load feedback loop on the basis of the classical frequency response model, establish an electric hydrogen production load frequency response model, and solve the negative feedback coefficient of the electric hydrogen production load participating in the system frequency regulation based on the electric hydrogen production load frequency response model. The control unit is used to obtain the amplification factor of the voltage frequency feedback control of the electric hydrogen production load bus based on the CVR coefficient and the negative feedback coefficient when subjected to system frequency disturbance, establish a feedback regulation coefficient controller based on the amplification factor, and realize the participation of the electric hydrogen production load in grid frequency regulation through the feedback regulation coefficient controller.

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