Operation control method and system for hydrogen-electricity coupling system

Abstract

The invention relates to a hydrogen-electric coupling system operation control method and system, and belongs to the field of hydrogen-electric coupling control. When the frequency at the public grid-connected point exceeds and / or is smaller than the corresponding set value, the corresponding adjustment value of the new energy power generation unit and / or the hydrogen production unit is obtained according to the difference value between the real-time frequency and the rated frequency of the power grid and the corresponding preset droop control coefficient; and the new energy power generation unit and / or the hydrogen production unit are / is enabled to perform active control according to the adjustment value. When the frequency at the public grid-connected point deviates from the rated frequency of the power grid greatly, the frequency at the public grid-connected point is effectively and rapidly adjusted to the rated frequency of the power grid, and the operation stability of the hydrogen-electricity coupling system is guaranteed.

Description

Technical Field

[0001] The invention relates to a hydrogen-electricity coupling system operation control method and system, and belongs to the field of hydrogen-electricity coupling control. Background Art

[0002] As one of the most promising secondary clean energy sources, hydrogen energy plays an important role in many fields such as ensuring energy security, adjusting energy structure, and promoting carbon emission reduction. It is widely used in transportation, industry, energy storage and other fields, and can achieve the goal of deep decarbonization.

[0003] The technology of producing hydrogen by electrolysis of water has existed for hundreds of years, but has developed slowly due to electricity costs.

[0004] The traditional water electrolysis hydrogen production system has a simple architecture and generally adopts a medium and low voltage distribution system. The thyristor rectifier power supply provides direct current to the electrolyzer, and the power supply of the power grid is stable and the load is constant. The new energy hydrogen production system involves many cross-disciplinary subjects. Wind and solar resources, energy storage equipment, hydrogen production equipment, and hydrogen storage equipment have become new elements of hydrogen energy production and will play an important role in the development of new power systems in the future. From traditional water electrolysis hydrogen production to large-scale new energy hydrogen production, the application scenarios have changed from small-scale, grid-drawn electricity, and constant power hydrogen production to large-scale, new energy power generation, and variable power hydrogen production. Since new energy power generation is unstable, how to convert unstable electricity into safe and stable hydrogen energy has become a new challenge.

[0005] The hydrogen-electric coupling modes of green electricity hydrogen production include off-grid type and grid-connected type. The off-grid type has no large power grid support and relies on energy storage to independently build voltage and frequency. The system has the characteristics of low inertia and weak damping. The weak support of new energy leads to the aggravation of the "hollowing out" of the power grid, and the intensity of the impact caused by failures increases. The regulation and tolerance of new energy are limited, which brings security challenges. The grid-connected type is divided into grid peak-shaving type and grid-friendly type. The grid peak-shaving type relies on the grid for power regulation, which has a great impact on the safe and stable operation of the grid and has high carbon emissions. The grid-friendly type greatly reduces the exchange of electricity between the system and the grid, and at the same time has the support of the large grid, and has broad application prospects. Since grid-friendly green electricity hydrogen production has restrictions on the amount of electricity on the grid and off the grid, the grid-connected interface capacity of the green electricity hydrogen production system is usually 10%. The output of new energy is monitored and predicted through EMS (Energy Management System) to achieve power balance of the energy management system. The control strategy response time is in minutes. For example, the Chinese patent application publication number CN118100274A and the application publication date 2024.5.28 discloses a hydrogen-electric coupling system operation control system and method. The method can predict the operation plan of the hydrogen production power supply on the day according to the output of the new energy power generation unit in the previous day, and perform active control and reactive control respectively according to the real-time collected frequency and voltage.

[0006] However, when the frequency monitored in real time deviates too much from the rated frequency of the system, the active power is slowly adjusted through the real-time frequency, so the control rate is slow, which in turn affects the stability of the entire system. Summary of the invention

[0007] The object of the present invention is to provide a hydrogen-electricity coupling system operation control method and system to solve the problem of slow active power regulation speed of the hydrogen-electricity coupling system.

[0008] To achieve the above object, the solution of the present invention includes: A method for controlling the operation of a hydrogen-electricity coupling system of the present invention includes a method for controlling a new energy power generation unit and / or a method for controlling a hydrogen production unit; The control method of the new energy power generation unit includes: when the real-time frequency at the public grid connection point monitored is greater than f H and less than f max When the power of the new energy source is adjusted, the power adjustment value of the new energy source is obtained according to the difference between the real-time frequency and the rated frequency of the power grid and the preset first droop control coefficient; the power adjustment value of the new energy source is added to the planned power value of the new energy source to obtain the active power reference value of the new energy source, and the converter in the new energy source power generation unit is actively controlled according to the active power reference value of the new energy source; The hydrogen production unit control method includes: when the monitored frequency is less than f L and greater than f min When the power supply of hydrogen production is at a certain level, the difference between the real-time frequency and the rated frequency of the power grid and the preset second droop control coefficient are used to obtain the hydrogen production power adjustment value; the hydrogen production power adjustment value is added to the hydrogen production power plan value to obtain the hydrogen production active power reference value, and the hydrogen production power supply in the hydrogen production unit is actively controlled according to the hydrogen production active power reference value; f H 、f L 、f max and f min are the corresponding set frequency values, and f H Greater than the rated frequency of the power grid, f L Less than the rated frequency of the grid.

[0009] Furthermore, the control method of the new energy power generation unit also includes: when the real-time frequency is greater than the rated frequency of the power grid, the active power adjustment value of the new energy participating in the frequency regulation is superimposed on the new energy active power reference value, and the active power adjustment value of the new energy participating in the frequency regulation is obtained by adjusting and controlling the difference between the rated frequency of the power grid and the real-time frequency; the difference between the rated voltage of the power grid and the real-time voltage at the public grid connection point is calculated and adjusted to obtain the new energy reactive power reference value, and the inverter in the new energy power generation unit is reactively controlled according to the new energy reactive power reference value.

[0010] Furthermore, the hydrogen production unit control method also includes: when the real-time frequency is less than the rated frequency of the power grid, the active power adjustment value of the hydrogen production power supply participating in the frequency regulation is superimposed on the hydrogen production active power reference value, and the active power adjustment value of the hydrogen production power supply participating in the frequency regulation is obtained by adjusting and controlling the difference between the rated frequency of the power grid and the real-time frequency; the difference between the rated voltage of the power grid and the real-time voltage at the public grid connection point is also calculated for adjustment and control to obtain the hydrogen production reactive power reference value, and the hydrogen production power supply in the hydrogen production unit is reactively controlled according to the hydrogen production reactive power reference value.

[0011] Furthermore, it also includes limiting the active power regulation value of the new energy participating in the frequency regulation, and the active power regulation value of the new energy participating in the frequency regulation after the limiting processing is superimposed on the active power reference value of the new energy; the limiting processing is to set the active power regulation value of the new energy participating in the frequency regulation to 0 when it is greater than 0.

[0012] Furthermore, it also includes limiting the active power adjustment value of the hydrogen production power source participating in the frequency regulation, and the active power adjustment value of the hydrogen production power source participating in the frequency regulation after the limiting adjustment is superimposed on the hydrogen production active power reference value; the limiting adjustment is to set the active power adjustment value of the hydrogen production power source participating in the frequency regulation to 0 when it is greater than 0.

[0013] Furthermore, it also includes performing ramp control processing on the new energy active power reference value, and using the new energy active power reference value after the ramp control processing to perform active power control on the converter.

[0014] Furthermore, it also includes performing ramp control processing on the hydrogen production active power reference value, and using the hydrogen production active power reference value after the ramp control processing to perform active control on the hydrogen production power supply.

[0015] Furthermore, when the frequency is greater than f max When the frequency is less than f min When the hydrogen production power plan value is reduced.

[0016] Furthermore, the rectifier in the energy router between the public grid connection point and the power grid adopts a dual closed-loop control strategy of voltage outer loop and current inner loop, and the voltage outer loop is used to stabilize the DC side voltage of the rectifier; the inverter in the energy router adopts a virtual synchronous machine control strategy.

[0017] A hydrogen-electricity coupling system operation control system comprises a processor, wherein the processor is used to execute a computer program to implement the steps of a hydrogen-electricity coupling system operation control method.

[0018] The beneficial effects of the present invention are as follows: the present invention is a pioneering invention. When the frequency at the public grid connection point exceeds and / or is less than the corresponding set value, the present invention obtains the corresponding adjustment value of the new energy power generation unit and / or the hydrogen production unit according to the difference between the real-time frequency and the rated frequency of the power grid and the corresponding pre-set droop control coefficient, thereby making the new energy power generation unit and / or the hydrogen production unit perform active power control respectively according to the adjustment value. When the frequency at the public grid connection point deviates greatly from the rated frequency of the power grid, the present invention effectively adjusts the frequency at the public grid connection point to the rated frequency of the power grid quickly, thereby ensuring the operational stability of the hydrogen-electricity coupling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the architecture of a hydrogen-electricity coupling system of the present invention; Figure 2 It is a schematic diagram of the architecture of a control system of the present invention; Figure 3 It is a principle schematic diagram of a control system of the present invention; Figure 4 It is a control schematic diagram of a new energy power generation unit of the present invention; Figure 5 is a control schematic diagram of a hydrogen production unit of the present invention; Figure 6 It is a schematic diagram of adjusting a hydrogen production plan of the present invention; Figure 7 is a schematic diagram of a rectifier control strategy of the present invention; Figure 8 is a schematic diagram of an inverter control strategy of the present invention; FIG9 (a) is a schematic diagram of a frequency-active power droop curve of the present invention; FIG9( b ) is a schematic diagram of a voltage-reactive power droop curve of the present invention; FIG10 (a) is a schematic diagram of a frequency-active power droop curve under an overfrequency condition of the present invention; FIG10( b ) is a schematic diagram of a voltage-reactive power droop curve under an overpressure condition of the present invention; FIG11( a ) is a schematic diagram of a frequency-active power droop curve under a low-frequency condition of the present invention; FIG11( b ) is a schematic diagram of a voltage-reactive power droop curve under a low voltage condition of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] The idea of ​​the present invention is that when the difference between the frequency at the public grid connection point and the rated frequency of the grid is large, a load shedding instruction is issued to the new energy power generation unit and / or hydrogen production unit to quickly restore the frequency at the public grid connection point to the rated frequency of the grid.

[0022] System Example: This embodiment provides a hydrogen-electricity coupling system operation control system. The overall architecture of the hydrogen-electricity coupling system to which the control system is applicable is as follows: Figure 1 As shown, the hydrogen-electric coupling system includes a new energy power generation unit, a hydrogen production unit and a power grid. Among them, the new energy power generation unit includes a wind power generation unit and a photovoltaic power generation unit. The wind power generation unit includes a wind turbine that converts wind energy into electrical energy and a wind power converter that converts the electrical energy generated by the wind turbine generator set into industrial frequency AC power and then sends it to the power grid. The photovoltaic power generation unit includes a photovoltaic module that converts light energy into electrical energy and a photovoltaic inverter that converts the direct current generated by the photovoltaic module into industrial frequency AC power and then sends it to the power grid; the hydrogen production unit includes a hydrogen production power source that converts the industrial frequency AC power of the power grid into direct current to supply the power consumption of the hydrogen production electrolyzer and then produce hydrogen; the energy router is used to realize the energy interaction between the new energy power generation unit, the hydrogen production unit and the power grid. The energy router adopts droop control to maintain the dynamic balance of the power of the entire system; the control system is used to monitor the operating status of the entire system and implement corresponding control strategies.

[0023] This embodiment divides the control system into a three-layer architecture, such as Figure 2 As shown in the figure, there are three layers: coordination control layer, stability control layer and local control layer. The EMS in the coordination control layer is the central brain of the entire control system, achieving energy balance during system operation; the stability control layer achieves fast and stable control of the entire control system; and the local control layer achieves control and management of local equipment. The control principle of the control system is as follows Figure 3 As shown in this figure, the public grid connection point ( Figure 1 The relationship between the frequency and active power of the AC PCC point is based on the droop characteristics between the frequency and active power in the droop control and is established in advance with reference to the national standard for power system frequency deviation. In the figure, f0 is the rated frequency of the power grid, 50Hz, and f L 、f H The preset minimum and maximum frequency values ​​for the local control layer to take action; f min 、f max The minimum and maximum frequencies that are preset for the stable control layer to take action. o is the power corresponding to the rated frequency, P H is the maximum active power corresponding to the minimum value of the local control layer action frequency; P L is the minimum active power corresponding to the maximum value of the local control layer action frequency; P maxis the maximum power corresponding to the minimum value of the action frequency of the stable control layer; P min It is the minimum power corresponding to the maximum value of the stable control layer action frequency.

[0024] When the frequency at the public grid connection point deviates greatly from the rated frequency of the power grid, the stability control layer controls the new energy power generation unit and / or hydrogen production power supply. In order to achieve rapid and stable control of the entire system, as a preferred embodiment, the control layer controls the new energy power generation unit and hydrogen production power supply in seconds according to the real-time frequency. When the stability control device in the stability control layer monitors that the frequency at the public grid connection point is at f H ~ f max When the frequency is between 0 and 100 Hz, the corresponding active power change is obtained according to the difference between the real-time frequency and the rated frequency of the power grid and the pre-set first droop control coefficient. The active power change is used as the new energy power generation adjustment value, and the stability control device sends the new energy power generation adjustment value of the second level to the new energy power generation unit in the local control layer. The new energy power generation unit adds the obtained new energy power generation adjustment value to the new energy power generation plan value to obtain the new energy active power reference value. The new energy power generation unit performs active power control on the wind power converter and / or photovoltaic inverter according to the new energy active power reference value. Among them, the wind power converter and the photovoltaic inverter can be collectively referred to as converters. Among them, the first droop control coefficient is Figure 3 Medium H ~ f max The slope value of the curve corresponding to the interval.

[0025] When the stability control device in the stability control layer detects that the frequency at the public grid connection point is at f min ~ f L When the real-time frequency is between 0 and 1, the corresponding active power change is obtained according to the difference between the real-time frequency and the rated frequency of the power grid and the preset second droop control coefficient. The active power change is used as the hydrogen production power adjustment value. The stable control device sends the hydrogen production power adjustment value in seconds to the hydrogen production unit in the local control layer. The hydrogen production unit adds the obtained new energy power adjustment value to the hydrogen production power plan value to obtain the hydrogen production active power reference value. The hydrogen production unit performs active control on the hydrogen production power source according to the hydrogen production active power reference value. Among them, the second droop control coefficient is Figure 3 Medium min ~ f L The slope value of the curve corresponding to the interval.

[0026] The renewable energy power generation power regulation value and the hydrogen production power regulation value do not exist every second. The renewable energy power generation unit and the hydrogen production unit will respond immediately upon receiving the renewable energy power generation power regulation value and the hydrogen production power regulation value.

[0027] As another embodiment, when the new energy power generation unit performs active power control, it also includes an active power adjustment value of the new energy participating in the frequency regulation. When the new energy power generation unit monitors that the frequency at the public grid connection point is between f0 and f H During the period, the new energy power generation unit performs PI control based on the difference between the real-time frequency and the rated frequency of the power grid, obtains the millisecond-level active power adjustment value of the new energy participating in the frequency regulation, and then superimposes it on the new energy active power reference value. In addition, the new energy power generation unit also performs real-time adjustment of reactive power, that is, adjusts and controls the difference between the real-time voltage at the public grid connection point and the rated voltage of the power grid, obtains the new energy reactive power reference value, and then performs reactive control on the wind power converter and / or photovoltaic inverter.

[0028] When the hydrogen production unit is performing active power control, it also includes the active power adjustment value of the hydrogen production power source participating in the frequency regulation. When the new energy power generation unit monitors that the frequency at the public grid connection point is at f L ~ f0, the hydrogen production unit performs PI control based on the difference between the real-time frequency and the rated frequency of the power grid, obtains the millisecond-level active power adjustment value of the hydrogen production power source participating in frequency regulation, and then superimposes it on the hydrogen production active power reference value. In addition, the hydrogen production unit also performs real-time adjustment of reactive power, that is, the difference between the real-time voltage at the public grid connection point and the rated voltage of the power grid is adjusted and controlled to obtain the hydrogen production reactive power reference value, and then the hydrogen production power source is reactively controlled.

[0029] As other implementation methods, in order to perform active power control faster, the new energy power generation unit and the hydrogen production unit limit the active power adjustment value of the new energy participating in the frequency regulation and the active power adjustment value of the hydrogen production power source participating in the frequency regulation, that is, when they are greater than 0, they are both modified to 0, and then active power control is performed according to the modified values ​​respectively.

[0030] As another implementation method, in order to stabilize active power control and prevent impact on the power grid, the new energy active power reference value superimposed with the active power regulation value of the new energy participating in frequency regulation and the hydrogen production active power reference value superimposed with the active power regulation value of the hydrogen production power source participating in frequency regulation are also ramp controlled so that they are gradually increased or decreased respectively.

[0031] In summary, the control of the renewable energy power generation unit is as follows Figure 4 As shown in the figure, f is the real-time frequency at the public grid connection point, f0 is the rated frequency of the grid, P EMS_energy is the planned value of renewable energy power generation, P Stb_energy is the power regulation value of renewable energy generation, P ref_energy is the reference value of the new energy active power after ramp control; U is the real-time voltage at the public grid connection point, U nis the rated voltage of the power grid, k u is the reactive voltage droop coefficient, Q ref_energy is the reference value of reactive power of new energy. The control of hydrogen production unit is as follows Figure 5 As shown in the figure, f is the real-time frequency at the public grid connection point, f0 is the rated frequency of the grid, P EMS_el is the planned value of hydrogen production power, P Stb_el is the hydrogen production power adjustment value, P ref_el is the reference value of active power for hydrogen production after ramp control; U is the real-time voltage at the public grid connection point, U n is the rated voltage of the power grid, k u is the reactive voltage droop coefficient, Q ref_el is the reference value of reactive power for hydrogen production. EMS_energy and P EMS_el They are predicted by EMS based on the power generation of renewable energy power generation units in the past few days, and they are all minute-level active power operation plans.

[0032] As another implementation method, the EMS can also adjust the issued minute-level active power operation plan, such as Figure 6 As shown, when the real-time frequency at the public grid connection point is greater than f max When the hydrogen production unit has equipment failure, the EMS will adjust the hydrogen production plan of the single hydrogen production system upwards, that is, increase P EMS_el ; When the real-time frequency at the public grid connection point is less than f min When there is a failure in the new energy power generation unit, EMS adjusts the hydrogen production plan for the day downwards based on the remaining unit capacity, i.e., reduces P EMS_el .

[0033] The energy router in the present invention is composed of a rectifier and an inverter. The rectifier capacity is 10% of the capacity of the new energy power generation system, and the inverter capacity is 3 times the rated capacity of the rectifier. The function of the rectifier is to stabilize the DC voltage, and its control strategy is a voltage and current double closed-loop control, such as Figure 7 As shown in the figure, since this control strategy is very mature in the prior art, it will not be described here. dc_ref is the DC reference voltage, u dc is the DC feedback voltage, i* d_ref is the d-axis component of the current command, i* d_fdb is the d-axis component of the current feedback, i* q_ref is the q-axis component of the current command, i* q_fdb is the q-axis component of current feedback, u d is the d-axis component of the grid voltage, u qis the q-axis component of the grid voltage; the inverter is used to provide reactive power support for the entire system, and adopts voltage source grid control, with frequency and voltage droop characteristics, and its control strategy is virtual synchronous machine control. Since this control strategy is very mature in the existing technology, it will not be repeated here. Figure 8 As shown in the figure, u abc is the output voltage, u d is the d-axis component of the output voltage, u q is the q-axis component of the output voltage, i Labc is the output current, i Ld is the d-axis component of the inductor current, i Lq is the q-axis component of the inductor current, ω is the output voltage angular frequency, ω0 is the grid voltage angular frequency, ω g is the rated angular frequency, L is the filter inductance, D is the damping coefficient, J is the moment of inertia, T0 is the reference torque, T m is the mechanical torque, T d is the damping torque, T e is the electromagnetic torque, k f is the frequency modulation coefficient, ΔT is the torque increment, P is the output active power, Q is the output reactive power, P ref is the active power command, Q ref is the reactive power command, k u is the voltage regulation coefficient, u ref is the voltage command, u is the output voltage amplitude, E0 is the reference internal potential, E d is the d-axis component of the internal potential command, I d_ref is the d-axis component of the current command, I q_ref is the q-axis component of the current command, and θ is the rotor phase. Among them, the droop characteristics of the voltage source network control technology are as follows: (1) Where, f is the frequency at the public grid connection point, f0 is the rated frequency of the grid, m is the frequency-active power droop coefficient, P is the active power, P n is the rated active power; U is the frequency at the public grid connection point, U n is the rated frequency of the power grid, n is the voltage-reactive power droop coefficient ( Figure 4 and Figure 5 k u ), Q is the reactive power, Q n is the rated reactive power.

[0034] According to the droop characteristics of the voltage source grid control technology, the droop curves are obtained respectively. The droop curve of frequency-active power is shown in Figure 9 (a), and the droop curve of voltage-reactive power is shown in Figure 9 (b). When the energy router operates at the rated operating point, the frequency at the PCC point is the rated frequency of the grid, and the voltage at the PCC point is the rated voltage of the grid. The energy router does not issue active power instructions and reactive power instructions.

[0035] When power flows into the grid, the frequency at the PCC point increases due to the voltage source grid control technology adopted by the energy router, corresponding to point (f1, P1) in Figure 10 (a). At this time, the voltage at the PCC point is greater than the rated voltage of the grid, corresponding to point (U1, Q1) in Figure 10 (b). At this time, the new energy generation unit performs PI control according to the difference between the real-time frequency and the rated frequency of the grid and the droop control to obtain the active power adjustment value of the new energy participating in the frequency regulation, and performs droop control according to the difference between the real-time voltage and the rated voltage of the grid to obtain the reactive power adjustment value of the new energy generation unit participating in the frequency regulation; and then adjusts the frequency at the PCC point to the rated frequency of the grid and the voltage at the PCC point to the rated voltage of the grid according to these adjustment values. Points (f1, P1) and (U1, Q1) in the figure are unified representations under the conditions of overfrequency and overvoltage, that is, as long as the frequency and voltage exceed the rated value of the grid, control is taken immediately.

[0036] When power flows out of the grid, the frequency at the PCC point decreases due to the voltage source grid control technology adopted by the energy router, corresponding to point (f2, P2) in Figure 11 (a). At this time, the voltage at the PCC point is less than the rated voltage of the grid, corresponding to point (U2, Q2) in Figure 11 (b). At this time, the hydrogen production unit performs PI control according to the difference between the real-time frequency and the rated frequency of the grid and the droop control to obtain the active power adjustment value of the hydrogen production unit participating in the frequency regulation, and performs droop control according to the difference between the real-time voltage and the rated voltage of the grid to obtain the reactive power adjustment value of the hydrogen production power source participating in the frequency regulation; then, according to these adjustment values, the frequency at the PCC point is adjusted to the rated frequency of the grid, and the voltage at the PCC point is adjusted to the rated voltage of the grid. Points (f2, P2) and (U2, Q2) in the figure are unified representations under low-frequency and low-voltage conditions, that is, as long as the frequency and voltage are less than the rated value of the grid, control is immediately taken.

[0037] Taking into account the capacity limitation of the energy router and the reduction of energy interaction with the power grid, and matching the characteristics of slow power increase and fast power decrease of the hydrogen production load, the EMS limits the power increase rate of the new energy power generation unit: When the wind speed and / or sunshine increases, and the real-time power generation of the renewable energy power generation unit is greater than the planned power generation value of the renewable energy power generation unit issued by the EMS, the real-time power generation of the renewable energy power generation unit is modified to the planned power generation value of the renewable energy power generation unit; When the wind power and / or sunlight decreases, and the real-time power generation of the renewable energy power generation unit is less than the planned power generation value of the renewable energy power generation unit issued by the EMS, the real-time power generation of the renewable energy power generation unit is modified to the renewable energy maximum power tracking mode; When the wind and / or sunlight increases, and the real-time power generation of the new energy power generation unit is less than the planned power generation value of the new energy power generation unit issued by the EMS, the new energy power generation unit tracks the maximum power point of the new energy power generation unit at a limited rate. Among them, the limited rate of the new energy power generation unit is set according to the climbing ability of the hydrogen production electrolyzer. For example, the power climbing ability of the ALK (Alkaline) electrolyzer is 1.5%Pn / s, then the limited rate of the new energy power generation unit is K times 1.5%Pn / s, Pn is the rated power of the electrolyzer, and K does not exceed 1.

[0038] Method Example: The present embodiment provides a method for controlling the operation of a hydrogen-electricity coupling system, which includes a new energy power generation unit control method and / or a hydrogen production unit control method. The new energy power generation unit control method is used to achieve rapid control of the new energy power generation unit, and the hydrogen production unit control method is used to achieve rapid control of the hydrogen production unit. Since the steps of the new energy power generation unit control method and the steps of the hydrogen production unit control method have been clearly introduced in the embodiment of the hydrogen-electricity coupling system operation control system, they will not be repeated here.

[0039] In this embodiment, when the frequency at the public grid connection point deviates too greatly from the rated frequency of the grid, the corresponding adjustment value of the new energy power generation unit and / or the hydrogen production unit is obtained according to the difference between the real-time frequency and the rated frequency of the grid and the corresponding pre-set droop control coefficient, so that the new energy power generation unit and / or the hydrogen production unit can quickly and stably restore the frequency at the public grid connection point to the rated frequency of the grid according to the corresponding adjustment value.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the operation of a hydrogen-electricity coupling system, characterized in that: Including a new energy power generation unit control method and / or a hydrogen production unit control method; The control method of the new energy power generation unit includes: when the real-time frequency at the public grid connection point monitored is greater than f H and less than f max When the power of the new energy source is adjusted, the power adjustment value of the new energy source is obtained according to the difference between the real-time frequency and the rated frequency of the power grid and the preset first droop control coefficient; the power adjustment value of the new energy source is added to the planned power value of the new energy source to obtain the active power reference value of the new energy source, and the converter in the new energy source power generation unit is actively controlled according to the active power reference value of the new energy source; The hydrogen production unit control method includes: when the monitored frequency is less than f L and greater than f min When the real-time frequency is 0.0400V and the rated frequency of the power grid is 0.0400V, the hydrogen production power adjustment value is obtained according to the difference between the real-time frequency and the rated frequency of the power grid and the preset second droop control coefficient; the hydrogen production power adjustment value is added to the hydrogen production power plan value to obtain the hydrogen production active power reference value, and the hydrogen production power supply in the hydrogen production unit is actively controlled according to the hydrogen production active power reference value; The f H 、f L 、f max and f min are the corresponding set frequency values, and f H Greater than the rated frequency of the power grid, f L Less than the rated frequency of the grid.

2. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: The control method for the new energy power generation unit also includes: when the real-time frequency is greater than the rated frequency of the power grid, the new energy active power reference value is superimposed with the active power adjustment value of the new energy participating in the frequency regulation, and the active power adjustment value of the new energy participating in the frequency regulation is obtained by adjusting and controlling the difference between the rated frequency of the power grid and the real-time frequency; the difference between the rated voltage of the power grid and the real-time voltage at the public grid connection point is calculated and adjusted to obtain the new energy reactive power reference value, and the converter in the new energy power generation unit is reactively controlled according to the new energy reactive power reference value.

3. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: The hydrogen production unit control method also includes: when the real-time frequency is less than the rated frequency of the power grid, the active power adjustment value of the hydrogen production power source participating in frequency regulation is superimposed on the hydrogen production active power reference value, and the active power adjustment value of the hydrogen production power source participating in frequency regulation is obtained by adjusting and controlling the difference between the rated frequency of the power grid and the real-time frequency; the difference between the rated voltage of the power grid and the real-time voltage at the public grid connection point is also calculated and adjusted and controlled to obtain a hydrogen production reactive power reference value, and the hydrogen production power source in the hydrogen production unit is reactively controlled according to the hydrogen production reactive power reference value.

4. The hydrogen-electricity coupling system operation control method according to claim 2, characterized in that: It also includes limiting the active power regulation value of the new energy participating in the frequency regulation, and the active power regulation value of the new energy participating in the frequency regulation after the limiting processing is superimposed on the active power reference value of the new energy; the limiting processing is to set the active power regulation value of the new energy participating in the frequency regulation to 0 when it is greater than 0.

5. The hydrogen-electricity coupling system operation control method according to claim 3, characterized in that: It also includes limiting the active power adjustment value of the hydrogen production power source participating in the frequency regulation, and the active power adjustment value of the hydrogen production power source participating in the frequency regulation after the limiting adjustment is superimposed on the hydrogen production active power reference value; the limiting adjustment is to set the active power adjustment value of the hydrogen production power source participating in the frequency regulation to 0 when it is greater than 0.

6. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: The method also includes performing ramp control processing on the new energy active power reference value, and performing active power control on the converter using the new energy active power reference value after the ramp control processing.

7. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: It also includes performing ramp control processing on the hydrogen production active power reference value, and performing active control on the hydrogen production power supply using the hydrogen production active power reference value after the ramp control processing.

8. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: When the frequency is greater than f max When the frequency is less than f min , reduce the planned value of hydrogen production power.

9. The hydrogen-electricity coupling system operation control method according to claim 1, characterized in that: The rectifier in the energy router between the public grid connection point and the power grid adopts a dual closed-loop control strategy of voltage outer loop and current inner loop, and the voltage outer loop is used to stabilize the DC side voltage of the rectifier; the inverter in the energy router adopts a virtual synchronous machine control strategy.

10. A hydrogen-electricity coupling system operation control system, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the hydrogen-electricity coupling system operation control method according to any one of claims 1 to 9.

Images