1871results about "Load balancing in dc network" patented technology

The invention discloses a DC bus voltage fluctuation suppression method of a renewable energy hydrogen production system, and relates to the technical field of renewable energy electrolysis hydrogen production. The method comprises the following steps: collecting system operation parameters in real time; bus voltage disturbance power is estimated based on a disturbance observer, and frequency decomposition is carried out; fusing the ARIMA model and the LSTM model to predict the load power, and calculating a prediction deviation; dynamically setting upper and lower limits of a bus voltage control interval according to the predicted deviation and the operation state; a multi-objective optimization function is constructed, bus voltage disturbance power, prediction deviation and a control limit value are comprehensively considered, and power regulation instructions of battery energy storage, a fuel cell and an electrolytic cell are solved; and executing power regulation control to realize bus voltage stabilization. The method can improve the grading response capability of voltage disturbance, the prediction accuracy of load power change, the adaptability of the control boundary and the overall operation stability of the system, and is suitable for the electric energy quality control of the hydrogen production system in a multi-source fluctuation scene.

The invention relates to the technical field of hydrogen production, in particular to a micro-grid hydrogen production system based on dynamic optimization control and a multi-mode energy scheduling method. Comprising a renewable energy power generation unit which comprises at least two distributed power supplies with different power generation characteristics; the multi-stage hydrogen production device is configured to receive the electric energy output of the renewable energy power generation unit and perform proton exchange membrane water electrolysis hydrogen production; the hybrid energy storage system comprises a super capacitor bank and a lithium ion battery pack which are connected in parallel to the direct current bus through a bidirectional DC / DC converter; the dynamic optimization controller is internally provided with a multi-time-scale coordination algorithm and is used for acquiring meteorological prediction data, load demand data and an energy storage SOC state in real time; the multi-mode scheduling module comprises three working modes including an island operation mode, a grid-connected operation mode and an emergency standby mode; according to the scheme, hydrogen production economy, equipment durability and power supply reliability can be considered at the same time.

Disclosed is a surgical end effector for use with a surgical instrument. The surgical end effector comprises a jaw, and a staple cartridge seatable in the jaw. The staple cartridge comprises a sensor array configured to take measurements corresponding to a parameter associated with a function of the surgical instrument, a processor, and a memory storing program instructions. The memory storing program instructions that, when executed by the processor, cause the processor to perform an initial calibration of the sensor array, determine an initial adjustment to the measurements based on the initial calibration, perform an in-use calibration of the sensor array, and modify the initial adjustment based on the in-use calibration.

The invention provides a self-adaptive constraint model active mismatch prediction control method based on voltage and current ripple resistance of a power converter in a hybrid energy storage system, and the method comprises the steps: building an island DC micro-grid system model, collecting the voltage and current information of a system, and designing a model prediction control frame of a power loop and a cost function of the model prediction control frame; designing a model predictive control framework of the current loop and a cost function of the model predictive control framework; designing an active model mismatch mechanism to enhance the response capability to dynamic change; determining an optimization problem with a normal value, and designing an adaptive constraint optimization algorithm to dynamically adjust constraint parameters and optimize control performance; and designing a steady-state and dynamic-mode trigger for adapting to the running state of the system. According to the invention, the trajectory tracking precision of the system under dynamic and steady-state working conditions can be significantly improved, current ripples caused by control delay can be effectively eliminated, damage to electrical equipment due to overlarge ripples can be avoided, and the service life of the equipment can be prolonged.

The invention discloses an alternating control method and system for the running state of a composite electrolytic cell cluster, and the method comprises the steps: firstly converting electric power into direct current through a converter by employing a photovoltaic power generation and wind power generation system, transmitting the direct current into a system direct current bus, and carrying out the hydrogen production according to the load range, starting time, hydrogen production efficiency and other running characteristics of an electrolytic cell during the hydrogen production of the electrolytic cell cluster; and dividing the hydrogen production power of the electrolytic cell into a plurality of operation state intervals. According to the input power level of wind and light power generation, the total power is divided into different working conditions in a stepped mode, the operation state of the electrolytic cell is dynamically adjusted according to the current power requirement, electric power in a direct-current bus is flexibly allocated to an electrolytic cell cluster through a DC / DC converter, and cooperative power distribution between a proton exchange membrane electrolytic cell and an alkaline electrolytic cell is ensured. Based on the difference between advantages and disadvantages, a matching mechanism of the operation state and different electrolytic bath types is planned, and the load of each electrolytic bath is balanced through state alternation, so that the dynamic operation stability of the whole system is enhanced and the hydrogen production efficiency is improved.

The invention relates to an optical storage direct flexible park adjustable load orderly energy using method and device and computer equipment. The method comprises the following steps: constructing a micro-grid architecture model of the optical storage direct-current flexible park according to equipment power utilization characteristics and power resource scheduling information of the optical storage direct-current flexible park; constructing an equipment operation model corresponding to each piece of power equipment according to the equipment operation characteristics of each piece of power equipment in the optical storage direct flexible park; according to the micro-grid architecture model and each equipment operation model, constructing an adjustable load ordered energy use objective function of the optical storage direct flexible park and park equipment operation constraint conditions; the park equipment operation constraint condition is used as a limit, an adjustable load ordered energy use target function is solved, and adjustable load ordered energy use adjustment information of the optical storage direct flexible park is obtained; the adjustable load orderly energy utilization adjustment information is used for adjusting the power resource distribution condition of the optical storage direct flexible park. By adopting the method, the satisfaction degree of the user on the regulation and control means of the adjustable load can be improved.

The invention relates to an optical storage and charging alternating current and direct current hybrid micro-grid construction control method and device and a medium. According to the method, level-to-level management is carried out on an energy storage converter according to an SOC value of an energy storage device. And the converter with the high priority is switched to a VSG mode, and whether the voltage and frequency fluctuation of the micro-grid exceeds an adjustment dead zone or not is detected. When the frequency fluctuation is exceeded, active power output is adjusted through a VSG mode; when the voltage fluctuation is exceeded, the reactive power output is adjusted. And the energy storage equipment is switched to the VSG mode step by step, and when the requirements cannot be met, the photovoltaic equipment and the electric automobile support power grid are put into use in sequence. Before the photovoltaic equipment is connected, the voltage of the photovoltaic equipment is synchronized to be consistent with that of the connected energy storage equipment, and the VSG mode is converted. And if further support is still needed, the electric vehicle is used for feeding by adjusting a charging pile control algorithm. And the voltage and the phase need to be synchronized before the electric vehicle is connected so as to cooperatively support the micro-grid. According to the method, the voltage and frequency stability of the micro-grid system is remarkably improved.

The invention relates to the technical field of power grid dispatching, and discloses an optical storage direct-current flexible micro-grid multi-target optimization dispatching system, which comprises a photovoltaic power generation module, an energy storage module, a direct-current power supply module, a flexible power supply module and a multi-target optimization dispatching module, and is characterized in that the multi-target optimization dispatching module comprises a monitoring unit used for monitoring each load unit in real time, acquiring basic power utilization information; the prediction unit is used for carrying out load prediction on the load unit at each moment every day according to the power utilization basic information; and the optimal scheduling unit is used for establishing a multi-target model by adopting a multi-target optimization algorithm and by taking the lowest daily operation cost and the maximum photovoltaic consumption rate of the optical storage direct-flexible micro-grid as targets, and solving the multi-target model based on a load prediction result to obtain an energy scheduling scheme of the optical storage direct-flexible micro-grid. According to the invention, the operation state of the micro-grid can be predicted and scheduled more accurately, so that an energy scheduling scheme with a better effect is obtained, and the energy utilization efficiency and the system operation stability are improved.

The invention discloses a hybrid hydrogen production system coupled with photovoltaic renewable energy and an optimal configuration method, and relates to the technical field of new energy utilization and energy storage control, and the hybrid hydrogen production system comprises a photovoltaic power generation unit, an alkaline water electrolytic tank unit, a proton exchange membrane electrolytic tank unit, a hydrogen storage unit, a control unit and the like. Photovoltaic electric energy is directly supplied to the two types of electrolytic cell stacks through the direct current bus, a traditional DC-DC power converter is omitted, and loss in the energy transmission process is reduced; and through a dynamic electrolytic cell switching algorithm configured by the control unit, the input proportion and the number of operation units of the two stacks are changed and adjusted in real time, and the quick response capability and the long-term stability are both considered. The system can stably produce hydrogen under the condition of renewable energy fluctuation, can dynamically adapt to input power change, can realize maximum power point tracking control on the premise of not using extra power conversion equipment, and remarkably reduces initial investment cost and operation energy consumption while ensuring hydrogen production efficiency.

The invention provides an AC / DC hybrid microgrid control method and system, electronic equipment and a storage medium. The method comprises the following steps: acquiring AC side bus frequency information and DC side bus voltage fluctuation information in an AC / DC hybrid microgrid; and based on the frequency information and the voltage fluctuation information, determining the working mode of the AC / DC hybrid microgrid, thereby controlling the operation and working state of each sub-grid in the AC / DC hybrid microgrid according to a power autonomous mode or a power mutual aid mode. And the working mode of the hybrid energy storage system is determined based on the energy storage charge states of the super capacitor and the storage battery. According to the alternating-current and direct-current hybrid microgrid control scheme provided by the invention, the hybrid energy storage system composed of the super capacitor and the storage battery is provided, stable transmission and fluctuation stabilization of power are realized through coordinated control of the interconnection converter and the energy storage subnet, power fluctuation working conditions of multiple scenes can be adapted, source-load-storage power balance is effectively realized, and the stability of the system is improved. And the stability and reliability of the micro-grid are improved.

The invention discloses a segmented energy storage direct-hanging convergence method based on photovoltaic direct-current networking, and relates to the technical field of segmented energy storage of photovoltaic direct-current networking, and the method comprises the steps: constructing a direct-current networking system, collecting the operation data of the direct-current networking, and constructing a data set; based on the data set, dynamically adjusting the output power of a plurality of energy storage modules in real time through an adaptive power distribution algorithm, and balancing each energy storage module according to the use frequency and depth; and constructing a long-term optimization strategy of the direct-current networking system based on real-time adjustment and control of the direct-current networking system, and continuously optimizing system configuration and algorithm performance. By combining direct current networking, segmented energy storage and an artificial intelligence algorithm, the electric energy conversion efficiency is remarkably improved, the equipment loss is reduced, load variable frequency driving is realized, the system structure is simplified, and the fault rate and the equipment cost are reduced. And meanwhile, energy storage utilization is optimized, the response speed and stability of the system are improved, and access of renewable energy sources is better adapted.

The invention discloses a wind and light off-grid hydrogen production two-stage power optimization method considering reserved energy of energy storage, and belongs to the technical field of wind and light off-grid hydrogen production system power optimization, and the technical scheme is that the method comprises the following steps: S1, establishing a wind and light off-grid hydrogen production system mathematical model; s2, inputting minute-level wind and light historical data; s3, formulating a power distribution rule considering deep coupling of an electrolytic bath operation condition and energy storage preparation energy in a first operation stage, and determining hydrogen production power and hybrid energy storage initial distribution power; and S4, in the second operation stage, with the minimum unit hydrogen production cost and the minimum average charge and discharge depth of the storage battery as targets, the hybrid energy storage power is optimized by adopting an improved multi-target particle swarm algorithm. The method has the beneficial effects that the hydrogen production stability and the energy storage and power supply capacity can be improved, and the wind and light abandoning rate and the unit hydrogen production cost can be reduced.

A vehicle is electrically connected to one or more removable accessories. The vehicle includes a user interface, an electrical power supply, a chargeable storage, and a controller. The controller may be configured to detect the one or more removable accessories that are connected to the at least one power outlet, determine an identifier associated with each of the one or more detected removable accessories, and cause the user interface to display one or more identifiers associated with the one or more detected removeable accessories.

The invention provides an electric vehicle charging station hierarchical control method and related equipment, and the method comprises the steps: obtaining the charge state of a battery, the output power of a charger and the nominal voltage of a DC micro-grid when all electric vehicles work in a vehicle-network interaction operation mode, and obtaining the output reference voltage of each electric vehicle charger; the charge balance module is used for realizing charge balance between electric automobiles through droop control; introducing state factors including output power and output voltage for each electric vehicle charger, and obtaining an average value of the state factors based on all the state factors; generating a voltage compensation item of each electric vehicle charger according to the average value of the state factors so as to compensate the output reference voltage of each electric vehicle charger to obtain a compensation result, and performing power distribution on the electric vehicle charging station according to the compensation result; the problems that batteries are damaged due to deep charge and discharge of the state of charge of the electric vehicle during vehicle-network interaction and the bus voltage fluctuates due to power change of the direct-current micro-grid are solved.

The invention provides an AC / DC hybrid microgrid multi-target scheduling method and system based on digital twinning, and relates to the technical field of microgrid scheduling, and the method comprises the following steps: building an AC / DC hybrid microgrid digital twinning model, and dynamically integrating the related data of a power grid; establishing a comprehensive total cost model of the small AC / DC hybrid micro-grid system; according to the method, three power generation modes of photovoltaic power generation, photo-thermal power generation and wind power generation and an energy storage device are combined, and an equipment dynamic efficiency model is established based on the influence of factors such as a local load and an external large power grid environment on the efficiency of AC / DC hybrid micro-grid equipment; various twin data such as a local load and an external large power grid environment are obtained through a digital twin model, a multi-target particle swarm algorithm based on an improved archive maintenance strategy and a fuzzy decision method is proposed with economic benefits and the health degree of the energy storage device as targets, the output condition of the energy storage device is dispatched and optimized in real time, and the output efficiency of the energy storage device is improved. And the multi-energy complementation and conversion capability of the system is improved.

The invention discloses a hybrid energy storage device control method, equipment and a medium, relates to the technical field of hybrid energy storage system control, and provides a hybrid energy storage device control method for solving the problem that a current lithium battery and a super capacitor are difficult to use in a hybrid manner, and the direct current bus voltage of a hybrid energy storage device is stabilized by using the super capacitor. Based on electrical characteristics, it can be known that the direct-current bus voltage is stable and does not have an over-high peak value. Furthermore, under the condition that the current is constant, the output power does not have an over-high peak value, so that the problem that the lithium battery is not suitable for a high-power scene is solved. Furthermore, in the method, the super-capacitor is only responsible for balancing the voltage of the direct-current bus, and the discharging time is short, so that the problem that the super-capacitor is not suitable for a high-capacity scene can be solved. Therefore, according to the method, the application scene problems of the lithium battery and the super capacitor are solved respectively, and preconditions and an effective control scheme are provided for implementation of the lithium battery-super capacitor hybrid energy storage device.

The invention provides a battery management system design method applied to a direct-current photovoltaic micro-grid. The system comprises a data acquisition and monitoring module, an intelligent algorithm analysis module and a dynamic balance management module. Parameters such as voltage, current and temperature of the battery pack are collected in real time through a sensor, data are processed and analyzed through big data analysis and a machine learning algorithm, and the health state and the residual life of the battery pack are predicted. And the system dynamically adjusts the charging and discharging states of each battery unit according to an analysis result, so that the over-charging and over-discharging phenomena are avoided, and the service life of the battery pack is prolonged. According to the intelligent battery management system, the operation efficiency and reliability of the photovoltaic micro-grid are improved, and remarkable economic and social benefits are achieved.

The invention discloses a micro-grid system based on a direct current bus and a control method, the micro-grid system comprises the direct current bus, an energy management unit and a plurality of power conversion modules, when the micro-grid system is in an independent adjusting mode, each power conversion module controls the direct current bus to operate according to bus operation parameters of the direct current bus; and when the micro-grid system is in a centralized regulation mode, the energy management unit issues a control instruction to coordinate the output power and / or the input power of each power conversion module. According to the technical scheme, a unified direct current bus framework is constructed, the photovoltaic energy unit, the energy storage energy unit, the commercial power energy unit, the direct current load and other loads are directly connected to the direct current bus, direct current direct supply and direct current direct charging are achieved, the energy link structure is simplified, the power conversion link is reduced, the overall energy efficiency of the system is improved, and the system cost is reduced. And the phenomena of multiple energy conversion and energy loss caused by dependence on an alternating current bus in the prior art are avoided.

A multi-drop, packet energy transfer (PET) receiver configured to be electrically connected to a PET transmission line and an electric load comprising receiver front-end circuitry including an input configured to be electrically connected to the PET transmission line, an output; and at least one switch or at least one diode connected at the output. There is a receiver output control and conditioning circuity with an input connected to the switch / diode, an output to be connected to the electrical load. There is a bootstrap capacitor connected across the input, and a bulk capacitor connected across the output and across the electric load. There is a load controller configured to operate the switch / diode to allow power to flow into the receiver output control and conditioning circuitry during transfer periods and to prevent power to flow into the receiver output circuitry during sample periods.

Systems, apparatuses, and methods are described for DC bus management. During startup, a power device may provide power at different voltages to the DC bus to ramp up the voltage of the DC bus from a zero voltage level to an operating voltage level. For example, the power device may be configured to provide power at different voltage levels during the ramp up. During the ramp up, the power device may send communications to query additional devices. Based on a response to the query the power device may set the voltage level. Protocols for over-current, sleep mode, and shutdown mode may include decreasing a higher voltage level to a lower voltage level.

A locomotive comprises a DC power bus, traction motors, batteries, and a charging source, but has no prime mover engine. Each traction motor includes armature and field windings connected in parallel across the DC power bus. The batteries provide power to the DC power bus when in a motoring mode, and receive power from the DC power bus when in a charging mode and a dynamic braking mode. The charging source is connected across the DC power bus to provide charging power to the batteries when in the charging mode. The traction motors also provide charging power to the batteries when in the dynamic braking mode. The power from the charging source is less than the power that would be provided by a prime mover engine. The charging source provides no power to the traction motors when in the charging mode.

Disclosed herein are systems and methods for sliding mode control enabled hybrid energy storage. In a specific embodiment, the system can include: a photovoltaic power generation unit; a hybrid energy storage system, where the hybrid storage system can include a battery, a supercapacitor, where the supercapacitor provides excess power demand based on different loading conditions, and a rate limiter; a sliding mode controller, where the slide mode controller controls a current in a hybrid energy storage system; a supercapacitor charging control; and a proportional integral controller. In a specific embodiment, the method can include: decoupling an average and transient hybrid energy storage system current with a single rate limiter, where the decoupling includes a battery discharge rate; regulating a battery current with a first sliding mode controller; and regulating a supercapacitor current with a second sliding mode controller, where a supercapacitor provides excess power demand.

A power system comprises an energy storage system including a rechargeable energy storage element and a converter connected to the rechargeable energy storage element and configured to connect to a bus so that the energy storage system is connected in parallel with a load and a main power supply system. The energy storage system cooperates with the main power supply system to supply power to the load. The power system may include a control circuit configured to monitor a voltage of the bus and control the converter to either charge or discharge the rechargeable energy storage element based on the voltage of the bus. The control circuit may also monitor a status of a state of charge (SOC) of the rechargeable energy storage element and a system load condition.

The invention provides a control method and device for a photovoltaic hybrid energy storage system, and belongs to the field of power systems. The method comprises the following steps: respectively obtaining a frequency variation and a frequency change rate of an alternating current side of the photovoltaic hybrid energy storage system; determining an expected battery power variation of the energy storage battery unit based on the frequency variation and the dynamic inertia coefficient, and controlling the energy storage battery unit to operate according to the expected battery power variation, so that the energy storage battery unit absorbs a low-frequency power variation caused by the frequency variation; the value of the dynamic inertia coefficient is determined by the frequency change rate and the frequency change quantity; and based on the frequency change rate, determining an expected capacitance power variable quantity of the super-capacitor unit, and controlling the super-capacitor unit to operate according to the expected capacitance power variable quantity, so that the super-capacitor unit consumes a high-frequency power variable quantity caused by the frequency change rate. The stability of the power grid system can be effectively guaranteed.

The present invention provides a coordinated control strategy for a wind, solar and storage DC microgrid, which belongs to the field of grid control technology, including S1: analyzing the operation mode of the DC microgrid in the grid-connected free mode and the operation mode of the DC microgrid in the grid-connected dispatching mode respectively; S2: establishing a DC microgrid control model for grid-connected operation, the DC microgrid control model for grid-connected operation includes a photovoltaic power generation system control model, a wind power generation system control model, an energy storage system control model, a grid-connected converter control model, a load management control model within the microgrid, and an energy coordination control model for the grid-connected DC microgrid; S3: establishing a simulation model for the grid-connected wind, solar and storage DC microgrid. Through the application of MPPT and LPTC control modes, the photovoltaic power generation system and the wind power generation system can adjust the power output according to actual working conditions and optimize energy utilization.

The invention relates to the technical field of hybrid energy storage control strategies, and discloses a hybrid energy storage progressive model prediction control method based on optimal duty ratio tracking. The method comprises the following steps: setting a front-end MPC and a rear-end MPC which are used for controlling the on-off of a switching tube in a system, selecting an optimal duty ratio output corresponding to the minimum cost function of the front-end MPC, driving the on-off of the corresponding switching tube to stabilize the bus voltage, calculating the real-time optimal reference power of hybrid energy storage at the next moment, and taking the real-time optimal reference power as the real-time optimal reference value of the rear-end MPC after passing through a high-pass filter; and selecting the corresponding optimal switching state output when the cost function of the rear-end MPC is minimum, and driving a corresponding switching tube to be switched on and switched off, so that the output power of the super capacitor tracks a real-time optimal reference value given by the front-end MPC in real time, the power fluctuation is stabilized, and the bus voltage is further stabilized. According to the invention, the fluctuation of the bus voltage is smaller under the fluctuation of the load power; and optimal reference power transmission under model prediction control is considered, so that the control performance is optimized.

The invention discloses a dynamic power distribution method and device for a direct-current micro-grid hybrid energy storage system, and relates to the technical field of electric energy storage management, and the method comprises the steps: collecting the power parameters, load demand fluctuation data and renewable energy power generation output data of each energy storage unit in the hybrid energy storage system in real time, calculating a multi-dimensional power entropy index, and calculating the power entropy index of the hybrid energy storage system; based on the indexes, power distribution weight coefficients are dynamically generated, power dynamic distribution is carried out, a charging and discharging strategy is generated, charging and discharging control of the hybrid energy storage system is executed, and power distribution is dynamically adjusted in combination with a real-time feedback mechanism. The technical problems that an existing energy storage system power distribution method lacks flexibility and cannot effectively cope with load fluctuation and unstable renewable energy sources, so that the system operation efficiency and stability are poor are solved, the charging and discharging strategy of the energy storage unit is dynamically adjusted through the multi-dimensional power entropy index and the real-time feedback mechanism, and the energy storage efficiency is improved. The technical effect of efficient and stable operation of the energy storage system is achieved.

The invention relates to the technical field of direct-current micro-grids, and provides an island type direct-current micro-grid voltage deviation distributed coordination control method, which comprises the following steps of: accessing each distributed power supply of a plurality of distributed power supplies in an island type direct-current micro-grid to the direct-current micro-grid through a current converter, each distributed power supply is provided with a distributed coordination controller; establishing a full duplex communication network among the distributed coordination controllers of the plurality of distributed power supplies; real-time state information of adjacent distributed coordination controller nodes is interacted through a full duplex communication network, and each distributed coordination controller realizes average voltage regulation and distributed voltage deviation regulation of the DC micro-grid by using a distributed coordination control algorithm according to the state information of neighbor nodes and the state of local distributed power supply nodes. According to the technical scheme of the invention, stable average voltage regulation of the island-type DC micro-grid is realized.

The invention discloses a self-adaptive virtual inertia control and power distribution method of an energy storage converter suitable for a multi-direct-current micro-grid. The method comprises the following steps: establishing a virtual direct-current motor control model; based on the virtual direct current motor control model, designing an adaptive virtual inertial parameter control and power distribution algorithm, so that the energy storage converter can simulate the inertia and damping characteristics of the direct current generator; constructing a small-signal model of the common DC bus of the multi-DC micro-grid, analyzing the influence of inertia and damping parameters on the dynamic performance and stability of the system, and drawing a Nyquist curve based on an impedance ratio criterion to optimize the inertia and damping parameters; and verifying the adaptability of the adaptive virtual inertial parameter control and power distribution algorithm in the multi-direct-current micro-grid, and realizing effective control on the bus voltage stability and the power distribution of the energy storage unit by adjusting the power response characteristic of the energy storage unit. According to the invention, the stability and response speed of the multi-direct-current micro-grid system are improved, the bus voltage fluctuation is effectively slowed down, and the service life of the energy storage unit is prolonged.

The present invention provides a DC microgrid system for a well group of pumping units and a coordinated control method thereof, and belongs to the technical field of DC microgrid systems. The technical scheme is as follows: the high voltage side of the step-down transformer is connected to the three-phase power grid, the low voltage side of the step-down transformer is connected to the AC input end of the AC / DC converter one, the DC output end of the AC / DC converter one is used as a common DC bus, the output end of the photovoltaic panel is connected to the low voltage input end of the unidirectional DC / DC converter, the high voltage output end of the unidirectional DC / DC converter is connected in parallel to the common DC bus, the stator output end of the permanent magnet wind turbine generator set is connected to the AC input end of the AC / DC converter two, the DC output end of the AC / DC converter two is connected in parallel to the common DC bus, and the pumping unit and the DC / AC converter three are respectively connected in parallel to the common DC bus. The beneficial effects of the present invention are: it can effectively reduce the voltage fluctuation of the DC bus and improve the stability of the power supply system.