CN115149552B - A control method for an AC-coupled off-grid wind power hydrogen production system - Google Patents
A control method for an AC-coupled off-grid wind power hydrogen production system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
本发明提供一种交流耦合离网风电制氢系统控制方法，利用源荷互动的交叉启动方式，最大化地利用了现有储能系统容量，保证系统功能正常的同时，大大减少了离网启动阶段系统对于储能系统瞬时功率值的要求，由此减少离网风电制氢系统对于储能系统配置的要求；通过两套PCS进行电压源控制及电流源控制的轮值切换，有效保证了在构网PCS配置满足系统最小要求的前提下，仍有一部分PCS采用直接PQ控制方式，进而更加主动、快速、精准、宽范围地平抑风功率高频波动，减弱供电随机性。
The present invention provides an AC-coupled off-grid wind power hydrogen production system control method, which utilizes a source-load interactive cross-starting mode to maximize the use of the existing energy storage system capacity, ensures normal system functions, and greatly reduces the system's requirements for the instantaneous power value of the energy storage system during the off-grid startup phase, thereby reducing the requirements of the off-grid wind power hydrogen production system for the energy storage system configuration; by performing rotation switching of voltage source control and current source control by two sets of PCS, it is effectively ensured that under the premise that the network PCS configuration meets the minimum system requirements, a part of the PCS still adopts a direct PQ control mode, thereby more actively, quickly, accurately, and widely suppresses high-frequency fluctuations in wind power, and reduces the randomness of power supply.
Description
Technical Field
The invention relates to the technical field of renewable energy source water electrolysis hydrogen production, in particular to a control method of an alternating current coupling off-grid wind power hydrogen production system.
Background
The renewable energy source water electrolysis hydrogen production technology can convert green electricity into green hydrogen, and is an ideal energy source conversion mode. Particularly, the off-grid wind power hydrogen production technology can effectively utilize wind power resources in remote areas, thoroughly avoid the influence of wind power on a power grid, save transmission line cost and have important research value. However, the current off-grid wind power hydrogen production technology has a plurality of problems:
(1) Due to the lack of support of a main power grid, an off-grid wind power hydrogen production system is generally required to be provided with an electrochemical energy storage system with larger capacity for establishing micro-grid voltage and frequency, and the power deviation of the system is rapidly responded and peak clipping and valley filling are carried out in the starting and running phases. However, electrochemical energy storage systems have extremely high costs, resulting in reduced overall economic efficiency of the system.
(2) The main flow off-grid wind power hydrogen production system adopts a direct current coupling structure, which requires full power rectification to the output side of a wind turbine, so that a permanent magnet wind turbine with higher cost is generally adopted, and the direct current link of a full power converter of a fan is directly used as final output.
(3) If the doubly-fed wind turbine generator is adopted, in order to realize excitation, starting and grid connection of the wind turbine generator in an off-grid state, an energy storage cabinet is generally connected in parallel on a direct current link of an alternating current-direct current converter of the doubly-fed wind turbine generator, and the current conversion system of the existing wind turbine generator is required to be transformed, so that the cost and the control difficulty are increased.
Disclosure of Invention
The invention aims to solve the problems that the configuration requirement of an off-grid wind power hydrogen production system on an energy storage system is too high, the conventional wind power plant structure is greatly improved, the research and development design cost is high and the like in the prior art.
In order to achieve the above object, the present invention provides a control method of an off-grid wind power hydrogen production system with ac coupling, the off-grid wind power hydrogen production system comprising: a wind farm (1) comprising a plurality of wind turbines, a hydrogen production system (2) comprising a plurality of electrolytic water hydrogen production devices, an electrochemical energy storage system (3), a public alternating current bus (4) and SVG devices (5); the alternating-current coupled off-grid wind power hydrogen production system is provided with a public alternating-current bus (4), the electrochemical energy storage system (3) comprises a PCS, and the wind turbine generator, hydrogen production equipment, the PCS and SVG equipment (5) are all connected to the public alternating-current bus through the high voltage sides of respective step-up transformers (7). The off-grid wind power hydrogen production system is connected with the micro-grid controller.
The wind farm (1) comprises a wind turbine generator set and a wind power prediction system, wherein the wind power prediction system is used for performing short-term power prediction and transmitting data to the micro-grid controller.
The hydrogen production system (2) comprises a plurality of electrolytic water hydrogen production devices and hydrogen production control units which are connected in parallel, and the hydrogen production control units are respectively connected with each electrolytic water hydrogen production device.
The electrochemical energy storage system (3) further comprises a storage battery pack, an EMS (energy management system) and a BMS (battery management system), the electrochemical energy storage system is used as a starting power supply, and the voltage frequency of the micro-grid is built through sagging control of the energy storage system, so that the starting of each device is supported; in the starting process, the instantaneous charging and discharging power of the energy storage system does not exceed the maximum value of rated power Pn of a single wind motor group and cold starting required power Pcold of single hydrogen production equipment.
The micro-grid controller is used for starting fans one by one and cold starting hydrogen production equipment one by one, is used for actively controlling the operation power point of the hydrogen production equipment to track the change of wind power output power, and adopts MPPT control.
The SVG equipment (5) is used for supplementing reactive power deviation of the system in the starting and running processes and maintaining reactive power balance.
The control method of the alternating-current coupled off-grid wind power hydrogen production system comprises the following steps of:
step one: the wind power prediction system predicts short-term power, and when the average wind power level for 4 hours in the future is judged to be higher than the minimum running power value of the hydrogen production system, the system enters a starting flow.
Step two: the PCS of the energy storage system rapidly establishes the voltage and the frequency of the micro-grid through sagging control, and charges an alternating current bus, a current collecting circuit and a transformer. In the charging process, the inrush current is reduced by adopting a mode of line sectional charging and successive input of a transformer.
Step three, a micro-grid controller starts fans one by one and cold-starts hydrogen production equipment one by one, electrochemical energy storage and SVG equipment rapidly compensate active and reactive deviations of a system, balance is maintained, the input fans adopt MPPT control, when the maximum total power Pmax which can be sent by the input fans is larger than the cold-start required power Pcold of the single hydrogen production equipment, the first hydrogen production equipment is cold-started and enters a preheating stage, and when the power of the hydrogen production equipment is increased to Pcold, the next fan is started; similarly, as Pmax increases, then the [ Pmax/Pcold ] (near rounding) station hydrogen plant is cold started; in the cold start power climbing stage of the hydrogen production equipment, electrochemical energy storage compensates power deviation between the wind power plant and the hydrogen production equipment.
And fourthly, when all M hydrogen production equipment are cold started and the electric power reaches Pcold, the fans are continuously started one by one, the micro-grid controller controls the total output of the wind power plant not to exceed the total cold starting power of all hydrogen production, and part or all of the fans enter a power limiting mode through rotating speed control or pitch angle control.
And fifthly, when the cold start reaches the set time and the hydrogen production condition is reached, starting the water electrolysis hydrogen production equipment to start hydrogen production.
Step six: the fan gradually exits from the power limiting mode, the output power of the wind power plant is improved according to the rate equivalent to the power increasing rate of the hydrogen production system, and the matching with the hydrogen production power is realized until all wind turbines reach the MPPT state, or all hydrogen production electrolytic tanks are in the maximum power state.
Step seven: the system enters a normal operation mode, and the micro-grid controller dynamically distributes and updates the power target value of the hydrogen production equipment according to the total power measurement value output by the wind power plant so as to realize dynamic tracking; because the wind power extreme power rising speed is higher than that of the hydrogen production system, when wind power suddenly increases, a mode of limiting the wind power rising speed is adopted to realize the coupling of the wind power extreme power rising speed and the hydrogen production system.
Further, the seventh dynamic tracking adopts a source-load interactive cross start mode, a control system collects real-time data of power supply and load, dynamically judges and decides start time and control mode of each device, and when Pmax is gradually increased, the [ Pmax/Pcold ] (near rounding) hydrogen production device is started immediately. In the starting process, the instantaneous charging and discharging power of the energy storage system does not exceed the maximum value of rated power Pn and Pcold of a single wind motor group, namely the minimum requirement of the system on the rated power of energy storage.
Further, the additional configuration of the partial electrochemical energy storage, during operation, the PCS is divided into two groups in a controlled manner: wherein the total power of any one set of PCS is at least the maximum of Pn and Pcold as described above. The first group of PCS adopts a droop control mode and is used for establishing the system voltage and frequency of the micro-grid, namely, the system voltage source; the other group of PCS adopts a PQ control strategy for stabilizing the high-frequency fluctuation of the wind power plant output and more accurately filling the power difference caused by the randomness of the wind power output, namely, the PCS is used as a current source of the system.
Further, the two groups of PCS can realize the switching of control modes and functions through the BMS, and the switching principle is as follows: when the SOC value of the sagging control group PCS reaches the upper limit or the lower limit, the sagging control group PCS is switched to a PQ control mode, and the target power value is adjusted to charge or discharge the sagging control group PCS on the basis of ensuring the normal functions of stabilizing the power fluctuation and filling the power difference so that the SOC is gradually recovered; at the same time, another set of PCS switches to droop control mode, responsible for establishing the voltage and frequency of the system.
Further, under the condition of sudden increase of wind power output, the step seven is used for limiting the power rising rate of the wind power plant, wherein the power rising rate is the same as the power rising rate of the hydrogen production system; when the wind power output value is higher than the steady-state absorption capacity of the hydrogen production system, the total power of the wind power plant is limited, the limit value is set to be the highest allowable power of the hydrogen production system under the current working condition, and the power limit value is realized through pitch angle control and rotation speed control.
Compared with the conventional technology, the invention has the beneficial effects that:
(1) According to the system start control method disclosed by the invention, the capacity of the existing energy storage system is utilized to the maximum extent by utilizing the source-load interaction cross start mode, so that the requirements of the system on the instantaneous power value of the energy storage system in the off-grid start stage are greatly reduced while the normal function of the system is ensured, and the requirements of the off-grid wind power hydrogen production system on the configuration of the energy storage system are reduced; in addition, by means of limiting power and limiting power rising speed of the wind power plant at specific time and within specific time period, the effect that hydrogen production power changes follow wind power changes is optimized to the greatest extent, and dependence on an energy storage system in the running process is reduced. In both aspects, the economy of the system is improved.
(2) According to the control method for the energy storage system in the off-grid wind power hydrogen production scene, provided by the invention, the voltage source control and the current source control are carried out through the two sets of PCSs, so that on the premise that the configuration of the grid PCS meets the minimum requirement of the system, a part of PCSs still adopt a direct PQ control mode, and further wind power high-frequency fluctuation is restrained more actively, rapidly, accurately and widely, the power supply randomness is reduced, and on the basis of the switching principle of the SOC state, the working reliability of the energy storage system is improved.
Drawings
Fig. 1: the embodiment of the alternating current coupling off-grid wind power hydrogen production system is shown in the figure;
Fig. 2: the invention relates to a starting flow chart of an alternating current coupling off-grid wind power hydrogen production system;
Fig. 3: an active power simulation graph is output for energy storage in the embodiment of the invention;
1, a wind power plant; 2. a hydrogen production system; 3. an electrochemical energy storage system; 4. a public ac bus; 5. SVG equipment; 6. a standby diesel generator; 7. a step-up transformer.
Detailed Description
FIG. 1 is a schematic diagram of an AC coupling off-grid wind power hydrogen production system configuration of the present invention, which mainly comprises: wind farm 1 of N doubly-fed wind turbines, wherein N is greater than 1; the hydrogen production system 2 of M alkaline water electrolysis hydrogen production devices comprises an electrochemical energy storage system 3 containing an accumulator group and PCS, a public alternating current bus 4, SVG devices 5 and a standby diesel generator 6, wherein M is larger than 1. The AC coupling off-grid wind power hydrogen production system runs in a grid-isolated mode, and has no energy exchange or physical connection with a main power grid.
The wind power plant 1 comprises a wind turbine generator, a box-type boosting transformer, a current collecting circuit, a converging device, a centralized control system and a wind power prediction system. And the wind power prediction system data is transmitted to the centralized control system and the micro-grid controller. The wind turbine generator is a variable pitch variable speed constant frequency double-fed asynchronous wind turbine generator;
The hydrogen production system 2 is an alkaline water electrolysis hydrogen production system and comprises M electrolytic water hydrogen production devices connected in parallel, wherein the electrolytic water hydrogen production devices comprise an electrolytic tank, a converter, a transformer, a control system and auxiliary systems for purification, hydrogen storage and the like, the operating power of any electrolytic tank can be independently controlled through the control system, and the power fluctuation range is 20% -120% of rated power. The rated total power of the hydrogen production system is not more than 83.3 percent of the rated power of the wind farm.
The electrochemical energy storage system 3 comprises a battery pack, PCS, EMS, BMS and corresponding auxiliary systems, the response speed ms being of the order of magnitude, the power factor being adjustable in the range-0.95 to +0.95, preferably a lithium iron phosphate battery system. The electrochemical energy storage system is used as a starting power supply, and the voltage frequency of the micro-grid is established through sagging control of the energy storage system, so that the starting of each device is supported; in the starting process, the instantaneous charging and discharging power of the energy storage system does not exceed the maximum value of rated powers Pn and Pcold of a single wind motor group.
The micro-grid controller is used for starting fans one by one and cold starting hydrogen production equipment one by one, actively controlling the operation power point of the hydrogen production equipment to track the change of wind power output power, and the electrochemical energy storage and SVG equipment rapidly compensates the active and reactive deviations of the system, maintains balance and adopts MPPT control;
the alternating current coupling off-grid wind power hydrogen production system adopts an alternating current bus coupling mode, and each wind turbine generator, each hydrogen production device, each energy storage PCS, SVG device 5 and diesel generator are all connected to a public alternating current bus through the high voltage side of each step-up transformer 7.
The alternating-current coupling off-grid wind power hydrogen production system adopts an electrochemical energy storage system connected on an alternating-current bus as a micro power supply, and realizes the establishment of the voltage frequency of the micro power grid through the sagging control of the electrochemical energy storage system, so that the starting of each device is supported. In the running process, a hydrogen production power following mode is adopted, namely the running power point of the hydrogen production equipment is actively controlled to track the change of wind power output power, the electrochemical energy storage and SVG equipment can rapidly compensate the active and reactive power deviation of the system, balance is maintained, the standby diesel generator 6 is used as an emergency power supply, and the system is put into use when the system is started for the first time or the electrochemical energy storage SOC is lower than the limit value. The system can completely realize isolated network operation, and has no energy exchange or physical connection with a main power grid. The controller can realize real-time monitoring, control and scheduling of all parts in the system, control the off-grid starting and running of the system, and ensure the balance and stability of the system in the whole process by the control method disclosed by the invention.
In the alternating-current coupling off-grid wind power hydrogen production system, the rated total electric power allocation scale of the hydrogen production system is at most 83.3% of the installed capacity of the wind power plant, so that the hydrogen production system has no idle capacity when the output power of the wind power plant reaches the maximum.
Referring to fig. 2, the control method of the ac coupling off-grid wind power hydrogen production system of the invention specifically comprises the following steps:
step one: and the wind power prediction system predicts short-term power, and when judging that the average wind power level for 4 hours in the future is higher than the minimum running power value of the hydrogen production system, the alternating current coupling off-grid wind power hydrogen production system enters a starting process.
Step two: the PCS of the energy storage system rapidly establishes the voltage and the frequency of the micro-grid through sagging control, and charges an alternating current bus, a current collecting circuit and a transformer. In the charging process, firstly, the transformers and the current collecting circuits of the fans from No.1 to N are sequentially charged, and then the hydrogen production transformers from No.1 to M are sequentially charged, so that the inrush current is reduced.
Step three, the micro-grid controller starts the fans one by one and starts the hydrogen production equipment one by one in a cold mode. The input fan adopts MPPT control, when the maximum total power Pmax which can be generated by the input fan is larger than the cold start required power Pcold of the single hydrogen production equipment, the first hydrogen production equipment is cold started and enters a preheating stage, and when the power of the hydrogen production equipment is increased to Pcold, the next fan is started; similarly, as Pmax increases, then the [ Pmax/Pcold ] (near rounding) station hydrogen plant is cold started; in the cold start power climbing stage of the hydrogen production equipment, electrochemical energy storage compensates power deviation between the wind power plant and the hydrogen production equipment.
Step four, when all M hydrogen production equipment are cold started and the electric power reaches Pcold, the fans continue to start one by one, the micro-grid controller controls the total output of the wind power plant not to exceed the total cold starting power of all hydrogen production, and part or all fans enter a power limiting mode through rotating speed control or pitch angle control;
And fifthly, when the hydrogen production condition is reached, starting the electrolytic tank and starting to produce hydrogen, wherein the time is about 30 minutes after cold start.
Step six: the fan gradually exits from the power limiting mode, the output power of the wind power plant is improved according to the rate equivalent to the power increasing rate of the hydrogen production system, and the matching with the hydrogen production power is realized until all wind turbines reach the MPPT state, or all hydrogen production electrolytic tanks are in the maximum power state.
Step seven: the system enters a normal operation mode, and the controller dynamically distributes and updates the power target value of the hydrogen production equipment according to the total power measured value output by the wind power plant so as to realize dynamic tracking; because the extremely power-up rate of wind power is higher than that of the hydrogen production system, when wind power suddenly increases, the wind power is limited to be increased, the wind power and the hydrogen production system are coupled, and the investment of the energy storage system is reduced. The dynamic tracking adopts a source-load interactive cross start mode, a control system collects real-time data of power supply and load, dynamically judges and decides the start time and control mode of each equipment, and when Pmax is gradually increased, the [ Pmax/Pcold ] (near rounding) hydrogen production equipment is started immediately. In the starting process, the instantaneous charging and discharging power of the energy storage system does not exceed the maximum value of rated power Pn and Pcold of a single wind motor group, namely the minimum requirement of the system on the rated power of energy storage, and the system cost is greatly reduced.
Under the condition of sudden increase of wind power output, the wind power plant is limited in power rising rate, and the power rising rate is the same as the power rising rate of the hydrogen production system; when the wind power output value is higher than the steady-state absorption capacity of the hydrogen production system, the total power of the wind power plant is limited, the limit value is set to be the highest allowable power of the hydrogen production system under the current working condition, and the power limit value is realized through pitch angle control and rotation speed control.
According to the starting and running strategy disclosed by the invention, in the process, the instantaneous charging and discharging power of the energy storage system does not exceed the maximum value of rated powers Pn and Pcold of a single wind motor group, namely the minimum requirement of the off-grid hydrogen production system on the rated power of the energy storage system, so that the system cost is greatly reduced.
FIG. 3 is a simulation graph of the output active power of the energy storage system (FIG. 1) according to an embodiment of the present invention, in the simulation model, the rated power of a single wind turbine is 2.5MW, the rated power of a single hydrogen production device is 5MW, and Pcold is considered according to 1 MW. The simulation model simulates the process of starting the system from the start-up procedure until 4 fans and 4 hydrogen production devices are started and enter a power-limiting mode, and the control strategy is executed according to the off-grid wind power hydrogen production start-up control method disclosed by the invention. It can be seen that in the whole process, the maximum value of the charging and discharging power of the energy storage system does not exceed the rated power pn=2.5 MW of the single wind turbine generator system, namely the energy storage system is regarded as the necessary minimum configuration of the system.
Based on the above necessary energy storage configuration, more preferably, a part of electrochemical energy storage systems are additionally configured, and during operation, the PCS is divided into two groups according to a control manner: wherein the total power of any one set of PCS is at least the maximum of Pn and Pcold as described above. In the running process, the first group of PCS adopts a droop control mode and is used for establishing the system voltage and frequency of the micro-grid, namely, the system voltage source; the other group of PCS adopts a PQ control strategy for stabilizing the high-frequency fluctuation of the wind power plant output and more accurately filling the power difference caused by the randomness of the wind power output, namely, the PCS is used as a current source of the system. The two groups of PCS can realize the switching of control modes and functions through the BMS, and the switching principle is as follows: when the SOC value of the sagging control group PCS is about to reach the upper limit or the lower limit of the SOC, the sagging control group PCS is switched to a PQ control mode, and the target power value is adjusted to charge or discharge the sagging control group PCS on the basis of ensuring the normal functions of stabilizing the power fluctuation and filling the power difference so that the SOC is gradually recovered; at the same time, another set of PCS switches to droop control mode, responsible for establishing the voltage and frequency of the system.
Under the strategy of controlling the double PCS wheel values, the work of the energy storage system can be effectively guaranteed to be uninterrupted, the power supply quality of the system power supply is greatly improved, and the work safety of the hydrogen production system is improved.
For example, the system configuration is as follows: the rated installed capacity of the wind power plant is 50MW, and the wind power plant consists of 20 2.5MW doubly-fed wind generating sets, and the serial numbers of the wind power plants are respectively 1-20 fans; the rated hydrogen production capacity of the hydrogen production system is 8000Nm3/h, and the system consists of 8 sets of electrolytic tanks with 1000Nm3/h hydrogen production capacity and rectifying and voltage transformation devices thereof, wherein the serial numbers of the electrolytic tanks are respectively from No. 1 hydrogen production equipment to No. 8 hydrogen production equipment, and the total rated power is about 40MW; the electrochemical energy storage system is configured to be 5MW/1h, wherein 2.5MW is the necessary configuration, and 2.5MW is the additional configuration of the preferred scheme, and the electrochemical energy storage system is composed of 4 sets of PCS with rated power of 1.25 MW; the rated power of SVG equipment is 10MW; the rated power of the diesel generator is 2MW.
The total operating power range of the hydrogen production equipment is 0-120% of rated power, namely, the maximum super-power is 40 multiplied by 120% =48 MW, and when the wind power plant is fully generated, after line loss, the total power can be basically consumed by the hydrogen production system. The rated power of the energy storage system is 5MW, so that the system can bear full load cutting of at most two fans or one hydrogen production device.
Taking wind speed of 8m/s as an example, the system starting process is described as follows:
step one: the wind power prediction system predicts short-term power, and when the average wind power level for 4 hours in the future is judged to be higher than the minimum running power value of the hydrogen production system, the system enters a starting flow.
Step two: the energy storage system 4 sets of PCS jointly establish micro-grid voltage and frequency through sagging control, and charge an alternating current bus, a current collecting circuit and a transformer. In the charging process, the inrush current is reduced by adopting a mode of line sectional charging and successive input of a transformer.
Step three, starting fans one by one and cold starting hydrogen production equipment one by one. The method comprises the following steps: (1) Starting a No. 1 fan, wherein pmax=1.5MW, and increasing the charging power of the energy storage system to 1.5MW; (2) Starting the No. 1 hydrogen production equipment, heating the hydrogen production equipment according to Pcold =20% ×5MW=1MW power, wherein 0.5MW wind power is still not utilized at the moment, and automatically reducing charging power to 0.5MW by electrochemical energy storage; (3) Starting a No. 2 fan, wherein pmax=3MW, and automatically increasing the charging power to 2MW by electrochemical energy storage; (4) The hydrogen production equipment No. 2 and the hydrogen production equipment No. 3 are sequentially started, and the electrochemical energy storage automatically reduces the charging power to 0MW; (5) Starting a No. 3 fan, wherein pmax=4.5MW, and automatically increasing the charging power to 1.5MW by electrochemical energy storage; (6) And starting the No. 4 hydrogen production equipment, absorbing 4MW power altogether by hydrogen production, converting the charging power of the energy storage system into 0.5MW, and so on.
Step four: when all 8 hydrogen production devices are cold started and the electric power reaches Pcold, the fans are continuously started one by one, the micro-grid controller controls the total output of the wind power plant not to exceed the total cold starting power of all hydrogen production devices, and part or all of the fans enter a power limiting mode through rotating speed control or pitch angle control;
Step five, starting the electrolytic tank 30 minutes after cold start, and starting to prepare hydrogen.
Step six: the fan gradually exits from the power limiting mode, the output power of the wind power plant is improved according to the rate equivalent to the power increasing rate of the hydrogen production system, and the matching with the hydrogen production power is realized until all wind turbines reach the MPPT state, or all hydrogen production electrolytic tanks are in the maximum power state.
Step seven: the system enters a normal operation mode, and the micro-grid controller dynamically distributes a power target value of the hydrogen production equipment according to the total power measurement value output by the wind power plant to realize dynamic tracking;
FIG. 3 is a graph of a simulation of active power output by the energy storage system of FIG. 1, which simulates the system from the start of a start-up procedure until 4 fans, 4 hydrogen production devices are started and a power-limited mode is achieved, and a control strategy is executed according to the off-grid wind power hydrogen production start-up control method disclosed by the invention.
More preferably, 4 sets of PCS are divided into two groups A and B, each group is composed of 2 sets of PCS with the power of 1.25MW, and in the operation process, the group A adopts sagging control as a voltage source of the system; group B adopts PQ control as a voltage source of the system; the two groups of PCS can realize the switching of control modes through the energy storage controller, and the switching principle is as follows: when the SOC value of the sagging control group PCS is about to reach the upper limit or the lower limit of the SOC, the sagging control group PCS is switched to a PQ control mode to carry out charge and discharge adjustment, and meanwhile, the other group PCS is converted into sagging control to be responsible for establishing the voltage and the frequency of the system.
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