441 results about "Off-the-grid" patented technology

The invention discloses a photovoltaic off-grid hydrogen production system and a control method thereof, and the method comprises the following steps: obtaining original data of an environment sensor, carrying out synchronous collection through a distributed data collection system, and obtaining standardized environment data through an STL algorithm, Z-score standardization and wavelet noise reduction processing; carrying out photovoltaic output power prediction by adopting an integrated learning method, and carrying out MPPT control optimization; an electrolytic cell dynamic model is constructed, multi-objective optimization and energy storage system state estimation are carried out, and energy storage optimization scheduling is achieved; and finally, realizing overall optimization of the system through a multi-time-scale coordination control framework. The system operation efficiency is improved, the system reliability is enhanced, the operation cost is reduced, and the system is particularly suitable for an off-grid hydrogen production scene with large photovoltaic energy volatility.

The invention belongs to the technical field of carrier frequency offset estimation, and particularly relates to a carrier frequency offset estimation method based on Newton orthogonal matching pursuit. The method comprises the following specific steps of: splitting CFO into two parts of frequencies, namely off-grid deviation and grid point frequency, and further modeling an observation signal as a parameter weighted compressed sensing problem; using a Newton orthogonal matching pursuit algorithm to iteratively optimize the off-grid deviation of the CFO and the estimation of the grid point frequency, and obtaining a CFO candidate frequency set; and obtaining a required CFO estimation result from the candidate set by using the lead code information of the target user. According to the method, the complexity requirement of an actual system is met, meanwhile, the precision of CFO estimation is remarkably improved, and good robustness is achieved.

The invention discloses a comprehensive energy storage system for off-grid wind-solar hydrogen production and a control strategy of the comprehensive energy storage system. The comprehensive energy storage system for off-grid type wind-solar hydrogen production is composed of power type energy storage, energy type energy storage and long-period energy storage, and the power type energy storage, the energy type energy storage and the long-period energy storage respectively meet the adjustment requirements of millisecond-second level adjustment, minute-hour level adjustment and hour-several-week adjustment time scales, the power type energy storage adopts a double-electrode-layer super capacitor, and the energy type energy storage adopts a double-electrode-layer super capacitor. Lithium ion battery energy storage is adopted for energy type energy storage, hydrogen energy storage is adopted for long-period energy storage, and a comprehensive energy storage system network structure wiring diagram is designed. Aiming at flexible control of the off-grid wind-solar hydrogen production comprehensive energy storage system, three layers of control strategies including a device-level control strategy, a system-level coordination strategy and a system-level recovery strategy are provided. In a system-level control strategy, a network construction coordination control strategy between energy storage of the double-electric-layer super capacitor and energy storage of the lithium battery is provided, and a network construction energy storage switching process of the comprehensive energy storage system is provided.

The invention provides a grid-connected and off-grid switching method of a multi-machine parallel energy storage system, a controller and the energy storage system, and belongs to the field of energy storage. The energy storage system comprises a plurality of energy storage converters connected in parallel, and the method comprises the steps that when the energy storage system works in an off-grid mode, if it is detected that a power grid recovers to be normal, all the energy storage converters are controlled to track the voltage of the power grid, and the off-grid voltage of all the energy storage converters and the voltage of the power grid are kept synchronous; when it is detected that the off-grid voltage of each energy storage converter and the grid voltage are kept synchronous, a grid-connected switch is controlled to be closed; after being connected in parallel, the energy storage converters are connected with a power grid through a grid-connected switch; and controlling the working loop of each energy storage converter to be switched from an off-grid loop to a grid-connected loop. According to the invention, automatic switching from the off-grid state to the grid-connected state during parallel operation of a plurality of energy storage converters can be realized, and power-failure-free switching from the off-grid state to the grid-connected state can be realized.

The invention provides an optimal configuration method of an off-grid wind power hydrogen production system considering full life cycle income, which comprises the following steps: receiving original data, carrying out abnormal value detection and missing value repair, obtaining multi-scale component data through empirical mode decomposition, and generating a time sequence characteristic matrix; extracting equipment performance characteristic parameters and establishing a performance prediction model; constructing a system dynamic model based on a Bond Graph method, and performing stability analysis; calculating all costs and system income of the whole life cycle, and generating a comprehensive evaluation matrix in combination with risk analysis; a multi-objective optimization function is constructed, a grey wolf algorithm is adopted for solving, and an optimal configuration scheme is generated; and performing simulation verification and sensitivity analysis on the optimal configuration scheme to generate a final configuration scheme. According to the method, the equipment performance attenuation law and the system dynamic characteristics are fully considered, and the accuracy and reliability of optimal configuration are improved.

The invention relates to an off-grid parallel operation starting method of an energy storage system, the energy storage system and a storage medium, and belongs to the technical field of energy storage. The host receives the phase locking synchronization completion signal and sends a voltage unification instruction to the slave after determining that the grid-connected slave completes phase locking synchronization, and the host and the slave are boosted from the black start voltage to the rated voltage based on the voltage unification instruction to complete parallel start, so that fluctuation caused by unstable voltage in the start process of the slave can be improved; the stability of the energy storage system in the off-grid parallel operation process is improved; the slave is started after being synchronized according to the black start voltage phase lock phase established by the host, so that the output voltage after the slave is started is consistent with the output voltage of the host, the voltage consistency of the parallel energy storage current device is high, ring current caused by voltage difference can be reduced, and the operation efficiency of the system is improved; and the slave is started after successful phase locking, so that the risk of starting failure can be reduced.

The embodiment of the invention relates to the technical field of energy storage, and provides an off-grid operation method of an energy storage system, the energy storage system and electric equipment, and the operation method comprises the steps: determining whether the grid connection of the energy storage system is powered down or not; under the condition of grid-connected power failure of the energy storage system, port voltage and port current of a load of the energy storage system at the grid-connected power failure moment are obtained, the port voltage of the load is the voltage of one end, connected with a filter of the energy storage system, of the load, and the port current of the load is the current of one end, connected with the filter of the energy storage system, of the load; the arc extinguishing current of the energy storage system is obtained, whether the off-line power-on moment of the energy storage system is reached or not is determined according to the size of the arc extinguishing current, and the arc extinguishing current is the current flowing through the filter; and under the condition that the off-grid power-on moment is reached, off-grid power generation is controlled, and the energy storage system is controlled to operate in an off-grid operation mode based on the port voltage and the port current of the load. The method determines whether to start off-grid according to the magnitude of the arc extinguishing current, thereby avoiding impact caused by direct start.

The invention discloses a wind, light, electricity, heat, cold air and hydrogen optimal scheduling method for an off-grid zero-carbon park, and the method comprises the steps: firstly, building an off-grid zero-carbon park system model, the system comprises energy supply equipment, energy conversion equipment and energy storage equipment, the energy source is renewable energy wind energy and light energy, and the load types comprise an electric load, a heat load and a cold load; establishing a mathematical model and operation constraint conditions according to the system model, and establishing an optimization objective function for the system; describing an optimized scheduling reinforcement learning framework of the off-network zero-carbon park system as a Markov decision process; on the basis of an improved flexible actor-commentator algorithm, advantage learning, transfer learning and an SAC algorithm are combined to solve the model. The advantages of multi-energy complementation are fully utilized, and the economical efficiency and the environmental protection property of the system are improved; and an improved flexible actor-commentator algorithm is adopted, so that the training time is shortened, the algorithm iteration speed is accelerated, and the flexible and efficient scheduling of the integrated energy system is realized.

The invention discloses an off-grid photovoltaic power generation system based on flywheel clean battery energy storage. A cleaning model and a charging / discharging equivalent model circuit under a d-q shaft system are established; a control strategy in the flywheel battery charging / discharging process is analyzed and determined, a photovoltaic system and a flywheel battery are combined, a combined system is divided into four working models according to the supply-demand relation between the output power of the photovoltaic system and the power required by a load, and a control method of a combined controller is formulated. And analyzing and optimizing the operation state of the system under each working model and the energy storage and release effects of the flywheel battery. The combined system can stably operate under each working model and among the working models; the charging / discharging efficiency and the discharging depth are relatively high, and a quick response can be made to the difference value change of the output and the load power of the photovoltaic system; and energy is stored when the output of the photovoltaic system is residual, and energy is released to make up for the demand when the output of the photovoltaic system is insufficient, so that the electric energy quality is effectively improved, and the resource waste is reduced.

The invention relates to an off-grid ammonia-hydrogen micro-grid planning method and system considering a mixed electrolytic bath and a medium, the method is applied to an off-grid hydrogen-hydrogen micro-grid, and the planning method comprises the following steps: modeling for an electric energy-hydrogen energy conversion process of various types of electrolytic bath modules; modeling for the process of transporting hydrogen produced by an electrolytic cell module to an ammonia production node by using a hydrogen long tube trailer; on the premise of considering constraint conditions, constructing a planning model of the off-grid hydrogen amino micro-grid; and performing linear processing on the constraint condition, and obtaining a planning result by solving the planning model of the off-network hydrogen amino micro-grid. Compared with the prior art, the method has the advantages of integrating the advantages of different types of electrolytic cells, reducing the total investment cost, improving the system elasticity, ensuring efficient and stable operation under different conditions and the like.

The invention discloses an off-grid working condition control system and method for an inverter. The system comprises an inverter current feed-forward module, a first control loop, a second control loop and an inverter voltage feed-forward module which are connected in sequence. Wherein the inverter current feed-forward module is used for providing a current feed-forward signal for an inverter voltage output end of the inverter so as to generate an inverter voltage reference signal; the inverter voltage feed-forward module is used for providing a voltage feed-forward signal corresponding to an inverter voltage instantaneous value of the inverter; the first control loop is used for outputting an inversion current reference signal according to the inversion voltage reference signal and the voltage feed-forward signal; the second control loop is used for outputting a voltage adjusting signal according to the inverter current reference signal and the inverter current instantaneous value of the inverter, so that the adjusting signal and the voltage feed-forward signal are added to generate a PWM waveform signal for load power control, and therefore, an impact load can be driven with low rated inverter power; and the cost and the resource waste can be effectively reduced.

The invention discloses an off-grid new energy hydrogen production start control method, system, device and medium, and relates to the technical field of new energy hydrogen production control and micro-grid operation management, and the method comprises the steps: employing energy storage zero-to-boost control and anti-interference communication to establish a bus voltage based on an off-grid system architecture; the output power of the wind turbine generator is adjusted through a variable pitch power following strategy based on short-term wind speed prediction, the power distribution proportion of the wind turbine generator and the energy storage device is dynamically adjusted by adopting an improved NSGA-II multi-target optimization algorithm in combination with the equipment health state factor, and the power output path and the response rate of the equipment are optimized; electrolytic hydrogen production is carried out by adopting electrolytic tank pre-starting condition inspection, stepped power rising and stepped starting of grid-connected transition in cooperation with closed-loop temperature flow regulation and a PID pressure management strategy, and black-start rollback and self-healing control are executed. According to the method, the stable construction of the bus voltage is realized through the boost control from zero energy storage, and the current impact in the starting process is effectively inhibited.

The invention relates to the technical field of multi-energy coupled off-grid power supply systems, and discloses a wind-solar hydrogen storage direct current coupled off-grid power supply system semi-physical simulation method, which comprises the following steps of building an off-grid power supply system real-time simulation model; designing and communicating a communication link; software and hardware development of an equipment controller; and constructing and testing a semi-physical real-time simulation platform. According to the semi-physical simulation method for the wind-solar hydrogen storage direct current coupled off-grid power supply system, modeling is improved through model simplification, network subdivision and electrical decoupling real-time simulation, and high-precision real-time simulation of the off-grid power supply system is achieved.

The invention belongs to the technical field of load prediction, and discloses an off-grid micro-grid system load prediction method and system based on a neural network. The method comprises the following steps: constructing an equipment fault diagnosis model, an energy scheduling model and a load prediction model by using a neural network algorithm; carrying out data acquisition and preprocessing to obtain preprocessed real-time area monitoring data; performing equipment fault diagnosis by using the equipment fault diagnosis model; if the real-time equipment fault diagnosis result is that a fault exists, entering an energy scheduling step, otherwise, entering a load prediction step; performing energy scheduling by using the energy scheduling model, executing the obtained real-time energy scheduling scheme, and returning to the data acquisition step; and performing load prediction by using the load prediction model. According to the method, the problems of data island, insufficient model generalization ability, limited fault diagnosis precision and efficiency, insufficient energy scheduling strategy optimization and poor load prediction precision and robustness in the prior art are solved.

The invention provides an off-grid synthetic ammonia park electrolytic bath column level-energy storage-hydrogen storage collaborative optimization method based on rolling optimization, and relates to the technical field of energy storage and hydrogen storage collaboration. The method comprises the following steps: constructing an off-grid system architecture comprising wind-solar power generation, a plurality of rows of electrolytic cells, energy and hydrogen storage equipment and a synthesis ammonia device; a multi-device collaborative optimization strategy based on an eight-hour rolling time domain is designed, the system operation state is divided into high, medium and low working conditions through a working condition recognition mechanism, a current device operation scheme is actively adjusted according to wind and light power information of a next scheduling period, and collaborative regulation and control of energy storage and hydrogen storage are achieved. Compared with a traditional scheduling strategy, the collaborative optimization strategy provided by the invention improves the consumption rate of renewable energy sources of the system, reduces abandoned wind and light, improves the yield of synthetic ammonia, and verifies the effectiveness of the strategy.

The invention discloses an off-grid and grid-connected smooth switching control method for a virtual synchronous generator based on adaptive parameters, and the method achieves the efficient switching and smooth transition of an off-grid and grid-connected mode through the dynamic adjustment of virtual impedance, rotational inertia and a damping factor based on a virtual synchronous generator control architecture of the adaptive parameters. The control architecture is divided into an inner loop current and voltage control module, an outer loop power-frequency control module and a self-adaptive parameter adjustment module, and comprises virtual impedance design, dynamic rotational inertia adjustment, self-adaptive damping factor switching and parameter optimization and modal analysis. In this way, the concept of virtual impedance is introduced into VSG control to improve the decoupling effect of active power and reactive power; a parameter alternating VSG is provided, singular value decomposition analysis and modal analysis are considered, and better performance is provided in the aspect of suppressing oscillation caused by disturbance by improving control parameters; and stable resynchronization between the converter and the power grid after grid connection and grid disconnection is realized.

The invention discloses a rapid power control method and system for an off-grid micro-grid containing a grid-forming distributed power supply. The method comprises the following steps: based on a microgrid information physical fusion model, sensing and identifying parameters and operation states of each part of the microgrid through a finite state machine; carrying out detailed modeling and description on each state of the system, and clearly displaying state conversion information and conditions of the micro-grid system; primary control based on a network construction type converter is introduced to control the power of the system, active and reactive power output is adjusted, and when the system senses and identifies corresponding parameter changes, each stage of control is triggered to act; secondary control is introduced to carry out rapid power control adjustment on the micro-grid, frequency and voltage excursion caused by primary control is made up, external disturbance is suppressed, and the power of each part of equipment is reasonably distributed; model predictive control based on data driving is introduced, accurate power distribution and global optimal control are achieved, and the system operates stably.

The invention provides an off-grid wind and light hydrogen production ammonia synthesis system operation control method and device, and relates to the technical field of renewable energy hydrogen production ammonia synthesis, and the method comprises the steps: building a system model of an off-grid wind and light hydrogen production ammonia system, the wind and light hydrogen production ammonia system satisfying a target function and a target constraint condition; wind-photovoltaic predicted output is obtained; calculating the fitness of each particle; respectively calculating hydrogen production power and ammonia synthesis power based on the hydrogen production flow and the ammonia yield; calculating the starting number of the electrolytic cells and calculating the abandoned electricity quantity; calculating energy storage output and energy storage capacity; calculating the fitness of each particle, comparing the fitness with a locally optimal solution and a globally optimal solution, and updating the locally optimal solution and the globally optimal solution according to a comparison result; and outputting the optimal solution set after the maximum number of iterations is reached. The real-time power balance of the wind-solar hydrogen production ammonia synthesis system can be met, the project profit maximization is realized, the utilization and consumption of renewable energy sources are improved, the electricity abandoning rate of new energy sources is reduced, and the green low-carbon transformation of the chemical process is facilitated.

The invention discloses an off-grid ALK-PEM green energy coupling hydrogen production system parameter configuration method. The method comprises the steps that S1, wind and light fluctuation characteristic parameters are collected; s2, calculating the capacity ratio of the electrolytic cell; s3, performing control parameter mapping; and S4, parameters of the cooling system are designed. The invention further discloses a corresponding configuration system, a configuration device, electronic equipment and a computer readable storage medium, and aims at a parameter collaborative configuration method of an alkaline electrolytic cell (ALK) and proton exchange membrane electrolytic cell (PEM) mixed hydrogen production system in a wind and light off-grid power supply scene, so that the core problems of low hydrogen production efficiency, short equipment service life, system instability and the like under a fluctuating power supply are solved.

The invention discloses a distributed photovoltaic system and method based on the Internet of Things technology and intelligent switch measurement and control, and the system comprises an intelligent metering and control module which is used for measuring the network access electrical parameters of all access rooms in real time, and achieves the off-network and grid connection of the distributed photovoltaic access rooms; the alternating current and direct current measurement and grouping control module is used for cutting off the photovoltaic power singly / grouping and directly adjusting the network access power of the photovoltaic power through communication between an intelligent switch and a photovoltaic inverter; power direction monitoring can be used for off-grid / grid-connected switching; communication between remote communication and a central control system is included, and real-time issuing of instructions and uploading of data are ensured; and the Internet of Things electric energy quality measurement and control module is used for monitoring the electric energy quality in real time, providing parameters for distribution operation and monitoring the influence of photovoltaic access on the electric energy quality of the power grid. According to the invention, through the intelligent measurement, metering and control module and the communication and grouping control module, the distributed photovoltaic access is effectively controlled, the voltage fluctuation and harmonic pollution of the power grid are avoided, and the stable operation is ensured.

The invention discloses a multi-electrolytic cell power optimization scheduling method and device for an off-grid wind and light hydrogen storage and production system. The method comprises the following steps: constructing an off-grid wind and light hydrogen storage and production system model and corresponding operation constraint conditions thereof; constructing a state space, an action space and a reward function of the intelligent agent model based on the off-grid type wind and light hydrogen storage and production system model and the corresponding operation constraint condition; the agent model executes an action corresponding to a randomly selected historical state to obtain a reward and a new state, and an experience multi-component group is formed; training the agent model based on the experience multi-component group to obtain an optimized agent model; and inputting data in the off-grid type wind and light hydrogen storage and production system model requiring multi-electrolytic cell power optimization scheduling into the optimized intelligent agent model to obtain actions corresponding to the optimized intelligent agent model so as to obtain the operation power of each electrolytic cell. By means of the scheme, automatic decision making can be achieved, and therefore the operation efficiency and stability of the whole off-grid type wind and light hydrogen storage and production system are improved.

The invention discloses a multi-objective hierarchical rolling optimization scheduling method and system for off-grid wind-solar green hydrogen production. The method comprises the following steps: firstly, establishing a total power balance model of an off-grid wind-solar hydrogen production scene, secondly, respectively establishing charging and discharging models of an energy storage device, introducing integer state variables of 0 and 1 to uniformly describe the independent charging and discharging models, and then respectively setting physical constraints. And finally, by establishing a multi-target hierarchical optimization proposition and according to the model and constraint established in the previous step, real-time wind and light power generation power and future power prediction data, performing optimization solution by adopting a nonlinear programming algorithm mixed with 0-1 integers. The system researched and developed based on the method can update a scheduling plan in a rolling manner through a prediction model and optimization according to high and low priority optimization targets set by an operator based on real-time and predicted wind-solar power generation power data, so that the dynamic optimization of a scheduling strategy is ensured, and reliable operation guidance is provided for wind-solar hydrogen production scheduling personnel in real time.

The present application relates to the technical field of energy storage inverters, and relates to a standby control method for an energy storage inverter and a related device. The method embodiment comprises: acquiring the remaining power of a storage battery corresponding to an energy storage inverter in an operation mode, and on the basis of the remaining power, determining whether to switch the energy storage inverter to a standby mode; in the standby mode, supplying power to a load by means of an alternating-current power grid, and storing power in a direct-current side bus capacitor connected to the alternating-current power grid by means of a grid-connected relay; and when the alternating-current power grid cannot supply power to the load, turning off the grid-connected relay, supplying the power stored in the direct-current side bus capacitor to a control system, and by means of the control system and on the basis of the remaining power of the storage battery, determining whether to wake up the storage battery. In the standby mode provided by the embodiment, emergency energy of a storage battery is ensured, power loss in the standby mode is reduced, and when a power grid cannot supply power, the storage battery can be timely wakened up to ensure the emergency power utilization requirement of a load, thereby expanding the application scenarios of energy storage inverters.

The invention provides a control method of a hybrid energy storage system, the hybrid energy storage system and equipment, and relates to the technical field of electric power. According to the scheme, the operation mode (off-grid or grid-connected) of the hybrid energy storage system is accurately identified, and the power supply role is intelligently and dynamically allocated according to the control strategy corresponding to the current operation mode, so that efficient operation and optimal management of the system are realized, and the purpose of supplying power to the local load in the grid-connected or off-grid operation mode is achieved. In an off-grid mode, the high-rate charge-discharge advantage of the sodium-ion battery can be fully played, the power requirement is quickly responded, and stable power supply of the system is ensured; in the grid-connected mode, the charging and discharging power of the two energy storage units can be flexibly adjusted by combining the characteristics of the power grid, the interaction of the power grid is optimized, and the overall performance of the system is improved.

The invention relates to the technical field of hydrogen production, in particular to an off-grid micro-grid hydrogen production system containing hybrid energy storage and a residual electricity consumption method. Comprising a renewable energy power generation unit, a hybrid energy storage unit, a hydrogen production unit, a standby load unit and a central controller, the renewable energy power generation unit is connected with the hybrid energy storage unit through a direct current bus, the hybrid energy storage unit comprises a super capacitor bank and a lithium ion battery pack, the super capacitor bank and the lithium ion battery pack are connected to the direct current bus in parallel through a bidirectional DC / DC converter, and power distribution of the super capacitor bank and the lithium ion battery pack is dynamically complementary based on real-time fluctuation frequency; the hydrogen production unit comprises an electrolytic cell and a hydrogen storage device, the electrolytic cell is connected with the direct current bus through a first DC / DC converter, and the standby load unit is connected with the direct current bus through a second DC / DC converter; the scheme can accurately quantify the polarization effect and dynamically correct the hydrogen production power.

The invention discloses a capacity configuration method and system for an off-grid wind and light storage combined hydrogen production system, and belongs to the technical field of renewable energy and hydrogen energy utilization. The method comprises the steps that a multi-time-scale coupling mathematical model including a wind power generation system, a photovoltaic power generation system, an energy storage system and an alkaline electrolytic cell is constructed, and a multi-target optimization model is constructed with the minimization of the annual wind and light abandoning rate, the minimization of the leveling hydrogen production cost and the minimization of the cold start proportion of the electrolytic cell as targets; and solving the multi-objective optimization model by adopting a multi-objective marine predator algorithm to obtain a Pareto solution set, determining an objective function entropy weight of the multi-objective optimization model by utilizing an improved entropy weight method, and selecting an optimal compromise solution as a system capacity configuration scheme. According to the method, the problem that the influence of wind and light output multi-time scale coupling, energy storage, dynamic response characteristics of the electrolytic cell and cold start of the electrolytic cell is ignored in the existing technical scheme is solved, and the purposes of efficiently absorbing wind and light resource fluctuation by the off-grid hydrogen production system, enhancing the operation reliability and optimizing the economic performance are achieved.

The invention relates to an off-grid comprehensive energy hydrogen production system planning method and device for a hydrogen demand, and the method comprises the steps: constructing a hydrogen production-storage-use full-process model which comprises an off-grid hydrogen production section model, a compression buffer section model and an industrial synthesis section model; the off-grid hydrogen production section model comprises a water electrolysis hydrogen production model, a biomass gasification hydrogen production model and a natural gas reforming hydrogen production model, the compression buffer section model comprises a compressor model and a hydrogen storage tank model, and the industrial synthesis section model comprises an industrial hydrogen load model; a hydrogen production system double-layer planning model comprising an upper layer planning model and a lower layer operation model is constructed, the upper layer planning model takes the minimum construction and operation cost, the minimum carbon emission and the maximum total hydrogen production amount as the target, and the lower layer operation model takes the minimum operation cost as the target; and solving the bilayer planning model of the hydrogen production system to obtain an optimal planning scheme. The carbon emission in the hydrogen production process is reduced while the industrial requirements for stability and reliability of hydrogen are met.

The invention relates to an off-grid photovoltaic air conditioner self-adaptive control system and method based on rolling self-learning, and aims to solve the problems of low power supply reliability, large battery loss, inflexible temperature control, weak adaptability and the like caused by poor matching between an existing off-grid photovoltaic system and an air conditioner load. The method mainly comprises the steps that parameters are collected in real time, loads are calculated, and air conditioning unit operation frequency bands of the off-grid system are dynamically divided based on the temperature difference; constructing a multi-target model for guaranteeing power supply, prolonging the service life of the battery and optimizing the thermal comfort of the off-grid system, and adaptively adjusting the target by utilizing a dynamic weight coefficient; the optimal sequence is solved through rolling time window optimization, and the off-grid regulation and control strategy is adjusted in real time in combination with temperature gradient feedback. According to the method, the energy dynamic matching efficiency in the off-grid supply and demand system can be improved, power supply is guaranteed, fine adjustment of temperature control is achieved, harmful charging and discharging are limited based on state optimization, loss is reduced, the service life is prolonged, and compared with a traditional regulation and control strategy, the method has remarkable advantages in reliability, comfort and economical efficiency.

The invention discloses a range-extended energy storage system and a control method. The range-extended energy storage system comprises a generator set, a battery pack, an AC / DC charger, a high-voltage box, a DC bus, an AC / DC bidirectional converter, a grid-side AC bus, a load-side AC bus, an energy management system (EMS), a charging pile and a photovoltaic inverter. The EMS comprises a load classification module, an early warning value management module, a load data recording module, an electricity price judgment module, an electricity price recording module, a parameter configuration module and a communication module. The extended-range energy storage control method comprises the steps of judging whether power is cut off or not, executing an off-grid or grid-connected strategy, obtaining an electricity price, executing a corresponding strategy according to a valley time period, a peak time period and a normal time period during grid connection and the like. According to specific conditions of a construction site, electric power generated by a photovoltaic generator and an electric generator can be quickly and conveniently dispatched, range extension is flexibly carried out through the energy storage equipment, dynamic control is achieved, and the site electric power dispatching capacity is improved.

The invention belongs to the technical field of comprehensive energy systems, and particularly relates to a water-wind-light-hydrogen multi-energy complementary off-grid system comprehensive benefit evaluation method based on TOPSIS. According to the technical scheme, the TOPSIS-based comprehensive benefit evaluation method for the water-wind-light-hydrogen multi-energy complementary off-grid system comprises the following steps: S1, determining an evaluation object; s2, determining a construction principle of an evaluation index system; s3, determining a construction method of comprehensive benefit evaluation indexes of the water-wind-light-hydrogen storage multi-energy complementary off-grid system; s4, determining a multi-energy complementary off-network system comprehensive benefit multi-level index weighting method; and S5, comprehensive benefit evaluation result calculation and analysis are carried out based on TOPSIS. The invention provides a TOPSIS-based comprehensive benefit evaluation method for a water-wind-light-hydrogen multi-energy complementary off-grid system, and solves the problem of comprehensively considering the popularization and construction of the water-wind-light-hydrogen multi-energy complementary off-grid system.