67results about How to "Easy to grid" patented technology

The invention discloses a control method of a flying capacitive type five-level inverter device which adopts an improved carrier wave overlapped PWM method. According to the control method of the flying capacitive type five-level inverter device, the states of '2' '1' '0' '-1' and '-2' needed for controlling an inverter are obtained, a level vector quantity selecting link is added by utilizing the redundancy characteristics of on-off states of a flying capacitor, the level vector quantity states are reasonably distributed after an initial value is set, and the voltage of the flying capacitor is controlled and balanced through switchover of the several level states. When the improved carrier wave overlapped PWM method is applied to a flying capacitive type five-level inverter circuit, the control method of the flying capacitive type five-level inverter device is higher in flexibility, is simpler to achieve and largely reduces line voltage harmonic compared with a traditional carrier wave phase-shifting PWM method.

The invention discloses a method for determining the allowed capacity of a distribution network distributed power supply. The method comprises a step of carrying out the conversion of an equivalent model on the fan of a distributed power supply to be accessed and photovoltaic equipment under a steady-state condition, a step of determining the maximum allowed capacity of a system distributed power supply through a distributed network current balance equation and a steady-state safety constraint condition with the maximum allowed capacity of the system distributed power supply as an objective function, a step of checking protection equipment characteristics on the determined maximum allowed capacity of the system distributed power supply, and viewing the determined maximum allowed capacity as a maximum allowed capacity accepted by a system if a characteristic of not damaging initial protection equipment is satisfied, and correcting the capacity of the distributed power supply until the characteristic of not damaging initial protection equipment is satisfied if the characteristic of not damaging initial protection equipment is not satisfied. The method has the advantages that the maximum allowed capacity of the distributed power supply of the distribution network in a steady state can be comprehensively and accurately calculated, and the guide of the planning of the distributed power supply in the distribution network is facilitated.

The invention discloses a nested tidal current generating set of an air guide sleeve paddle-changing horizontal shaft, and belongs to the field of ocean regenerative energy development. The generating set is composed of an outer air guide sleeve, an air guide sleeve support, an inner air guide sleeve, a main shaft, a main shaft bearing, a hub, a blade, a paddle-changing bearing, a paddle-changinggear, a paddle-changing rack, a paddle-changing motor, a storage battery, a generator, a gear box and seal; and the outer air guide sleeve and the inner air guide sleeve form the nested air guide sleeve, the roof of the blade realizes the blade paddle-changing through the paddle-changing motor. The nested tidal current generating set provided by the invention has the advantages that the blade neighbouring tide flow velocity is greatly improved through the nested air guide sleeve, a paddle-changing mechanism causes a horizontal shaft to be adapted to reversing current, the efficiency is obvious high, thereby having self-starting ability at different flow rates; a complete machine structure is concise, the electrical energy output is stable, thereby having cleanness and no pollution.

The invention discloses one triangle function limit micro variable flow method, which comprises the following steps: setting displacement transducer connection set to get needed basic voltage; using each base frequency and frequency function or different function to form triangle function limit micro variable equation with two sides as input and output signals; setting sine function transducer, power electron switch and outside circuit to get the analysis variable equation topological circuit and integrating the angle frequency and difference to form integral logic control.

The invention discloses a low-medium temperature heat energy recovery power generation device which comprises a heat exchanger, a turbine generator, a condenser and a refrigeration agent pump, wherein the heat exchanger is provided with a heat source outlet, a heat source inlet, a refrigeration agent outlet and a refrigeration agent inlet, wherein the refrigeration agent outlet is connected with the turbine generator; the turbine generator, the condenser and the refrigeration agent pump are sequentially connected with one another; an outlet of the refrigeration agent pump is connected with the refrigeration agent inlet; the heat exchanger can be used for driving turbine generator to generate electricity by vaporizing the liquid refrigeration agent by using heat of a heat source flowing through the heat source inlet; the condenser is used for condensing the refrigeration agent after the refrigeration agent pushes an impeller to rotate, and then outputting the condensed refrigeration agent to the refrigeration agent pump; and the refrigeration agent pump is used for sending the condensed refrigeration agent back to the heat source inlet. The low-medium temperature heat energy recovery power generation device can be used for generating electricity by utilizing waste low-medium temperature heat energy, and has the advantages of high energy conversion rate, good applicability and stable output.

The invention relates to a device for generating power through natural energy, in particular to a floating type offshore wind plant wave energy auxiliary power generation device. The floating type offshore wind plant wave energy auxiliary power generation device is structurally characterized in that a plurality of gas chambers are formed in inner cavities of floating platforms and are sequentially connected with the gas inlet chamber as the head and the gas outlet chamber as the tail, a vent hole is formed between every two adjacent gas chambers and provided with a ventilation check gas valve, and a water chamber is arranged below each gas chamber and communicated with seawater; two ventilation holes are formed between each gas chamber and the corresponding water chamber, and the floating platforms are connected; a gas outlet of the floating platform in the front is connected and communicated with a gas inlet of the floating platform behind through a pipeline; compressed gas flow is connected to an air turbine through a gas flow channel, and the air turbine is connected with a rotating shaft of an AC power generator. The floating type offshore wind plant wave energy auxiliary power generation device has the advantages that the offshore wind power generation type and the wave energy power generation type are comprehensively utilized, the wave energy is effectively combined into deep sea wind power, the power compensation under the complex environment is achieved, the power output stability is ensured, and the grid connection is facilitated.

The invention discloses a comprehensive utilization system for marine energy, which comprises a wind turbine, a wave energy converting device and an ocean current energy converting device, wherein the ocean current energy converting device comprises a plurality of floating platforms which are arranged on the periphery of the wind turbine; the floating platforms have closed tops and opening lower ends; each of the floating platforms is fixedly connected with a vertical column which is fixed on seabed; the floating platforms are communicated through connecting pipes which are mounted on side walls of the floating platforms; air holes are respectively formed at the tops of two floating platforms; one-way ventilating valves in inverse directions are respectively mounted; one floating platform can only suck air while the other floating platform can only discharge air; an air turbine is mounted at the top of the floating platform which can only discharge air; and an output shaft of the floating platform and the output shaft of the ocean current energy converting device realize the power combination through a gear system so as to drive a generator for generating electricity. The three generating forms, namely, marine wind energy, wave energy and ocean current energy, are comprehensively utilized by the system, the complementation of electric power under a complex environment is realized, the stability of power output is ensured and the grid-connection is benefited. Besides, the impact of the wave to a tower and the turbulivity of the ocean current are reduced by the wave energy converting device.

The invention provides a method and a device for controlling the coordinated operation of a wind power and solar power complementary system. A maximum power output predication value of wind power anda maximum power output predication value of solar power are calculated at first; then wind power output dispatch instruction values and solar power output dispatch instruction values at various moments are determined through a multi-target optimization module; and then the actual power of a wind power plant and the actual power of a solar power plant in the wind power and solar power complementarysystem are controlled according to the wind power output dispatch instruction values and the solar power output dispatch instruction values at the various moments. By adopting the method and the device provided by the invention, the grid connection of renewable energy sources is promoted, the abandoned air volume is reduced, and the benefits of the grid connection are increased; the maximizing ofthe benefits of the grid connection of the wind power and solar power complementary system and the variance of the grid-connected output power are coordinated better, and the grid connection of the renewable energy sources and the friendly operation of the relative power grid are facilitated.

The invention relates to an altitude difference extraction-type artificial wind power generation device, in particular to a wind power generation device which forms a continuous and stable wind field by using an extraction tube with a certain height and the action of an atmosphere altitude pressure difference and has adjustable speed. The altitude difference extraction-type artificial wind power generation device comprises a whole set of generating devices of an altitude difference extraction pipeline device, a wind power generation device, a speed regulating device, a power output processing control system and the like; as well as a whole set of design theory methods of an equivalent energy calculating method, a power measuring and calculating as well as type parameter matching method, an energy conversion rate improving method, a speed regulation and overspeed protection method and the like. The invention solves a series of technical problems of instable and uncontrollable natural wind power generation, low energy use ratio, mismatching of power transmission and power distribution, difficult synchronization, and the like in the prior art, settles the theoretical misunderstanding of the traditional similar artificial wind power generation method, makes the artificial wind power generation technology into reality, ensures that the wind power development center is moved from countryside to the city so that people can use the self-generating power without pollution and energy consumption truly, and further eliminates the urban heat land effect and improves the urban dwelling environment.

The invention relates to a water wheel tank car power generation device which utilizes water flow discharged by a hydroelectric power plant but not utilized yet as a power source so as to perform power regeneration. The device comprises a water wheel tank car, a water wheel with the two ends outputting power, a bevel gear disc, a conical gear, same-direction transmission shafts on the left and right sides, a transverse transmission shaft, a ratchet gear transmitting power in the single direction, a center active force transmission shaft, a dual-direction car, a clutch, a speed-up gear box, an inertia flywheel disc and a power generator. The device utilizes the water wheel tank car to enter and exit a working area, the optimum acting point of the water wheel is adjusted, power is transmitted, and the power generator is pulled to generate power. The water flow which is discharged in a long time is used as the power, so that clean, environment-friendly, non-pollution, energy-saving and emission-reduction electric energy is provided in a long time, and the stable electric energy can be provided in a long time so as to facilitate grid connection. Long-time discharged water flow can be utilized for power regeneration, so that ecological civilization construction is facilitated. Energy-saving electric energy can be provided in a long time, so that economic benefits are achieved.

The invention discloses an offshore wind energy storing and conveying system for wind power generation. A plurality of offshore wind driven generators, a gas storage system and a pneumatic generator are included, the offshore wind energy storing and conveying system is a system through which offshore wind energy is converted into compressed air potential energy for storage and long-distance transportation, and the offshore wind energy is converted into kinetic energy for a fan blade shaft to drive an air compressor to work. According to the air transmission rate, reasonable water depth is selected to arrange a flexible air bag, constant-pressure compressed air with the same pressure as the water pressure is stored in the flexible air bag, sufficient compressed air is pressed to the pneumatic generator above the sea level through the constant water pressure, and the transmission rate and the air supply time can be accurately controlled, so that stable electric power output is obtained; and offshore wind energy is utilized to the maximum extent, the cost of offshore power generation and electric energy transmission is saved, and usage of underwater cables is replaced. An underwater flexible bag body stores energy online, the problem about wind power generation electric energy storage is solved, compressed gas is stably and continuously supplied, stable power output is guaranteed, and grid connection is easy.

The invention relates to a steam turbine and organic Rankine cycle fluid turbine dual-drive combined electricity generation or mechanical working equipment. The equipment is driven by a turbine expander, which distributes two different working media respectively through a converging type cylindrical gear box and cantilever structures for two input shafts, and transmits electricity or directly works through an output shaft. After passing through a steam turbine to enable the steam turbine to run to work, an organic Rankine cycle heat source, namely saturated steam, enters an evaporator to exchange heat with an organic working medium, then the organic working medium enters a working medium turbine to enable the working medium turbine to run to work, and finally the organic working medium returns to a condenser to finish an internal cycle through a working medium pump; and after exchanging heat with the organic working medium in the evaporator, the heat source steam returns to a cooling tower and then passes through a waste heat boiler or directly passes through the waste heat boiler to finish an external cycle. According to the equipment, a steam cycle system not only plays a role in utilizing a high-grade heat source but also plays a role in adjusting hear source parameter and improving the heat exchange efficiency of the evaporator, and an organic Rankine cycle plays a role in further utilizing a low-grade heat source to save energy and protect environment.

The invention relates to a FDD (Frequency Division Duplex) high-temperature superconducting RF (Radio Frequency) front end subsystem, which comprises a duplexer, a high-temperature superconducting filter and a low-temperature low-noise amplifier and is characterized in that the duplexer is an unsymmetrical duplexer. The invention has the advantages that the original emitting channel filter characteristics of a conventional RF front end are kept, a receiving channel integrates the advantages of high frequency selectivity of the superconducting filter and low noise of the low-temperature low-noise amplifier, and the FDD high-temperature superconducting RF front end subsystem has the advantages of compact structure, excellent technological indexes, rapidness in parallel networking, and the like.

The invention belongs to the technical field of a microgrid, relates to a harmonic monitoring control system based on a multi-source microgrid, in particular to wind power, photovoltaic and energy storage devices, and provides a microgrid harmonic monitoring control system based on data collection and analysis technologies. The system is mainly composed of a data collection module, a data storage and analysis module and a harmonic information display and control module. The data collection module is connected with the data storage and analysis module, and the data storage and analysis module is connected with the harmonic information display and control module. According to the system, the characteristic of independent distribution of a microgrid harmonic source can be fully used, the harmonic current level in the microgrid is effectively controlled, power supply quality of a microgrid user is improved, damage of harmonics to sensitive devices in the microgrid is reduced, the service life of the devices is prolonged, quality of power output by the microgrid is guaranteed, and grid-connected power generation benefits are improved. The system has good application prospects in a microgrid project containing multiple power electronic devices.

The invention discloses a power generation system which comprises a high pressure air system, a channel switching system, a gas-liquid mixing system, a fluid-power power generation system and a control system. The high pressure air system, the gas-liquid mixing system and the fluid-power power power generation system are connected through the channel switching system and are controlled by the control system; the control system changes operating states of the power generation system; the operating states of the power generation system are divided into an energy storage state and a power generation state: when at the energy storage state, the power generation system absorbs new energy electric energy from a power grid and converts the new energy electric energy into compressed air which is stored in the high pressure air system; and when at the power generation state, under the function of the control system, air energy is converted into electric energy through the high pressure air system, the gas-liquid mixing system the fluid-power power power generation system and the channel switching system. According to the power generation system provided by the invention, the phenomena of wind curtailment, light curtailment and water curtailment can be alleviated, and the problem of low consumption proportion of renewable energy sources caused by difficult renewable energy source grid-connection and difficult consumption after grid-connection is solved.

The invention relates to the technical field of sea wave power generation and linear movement power generation, in particular to a wave power generation system based on a tubular type permanent-magnet linear generator. The wave power generation system based on the tubular type permanent-magnet linear generator comprises a main panel and generator modules, wherein a plurality of motor grooves are formed in the main panel; the generator modules are inlaid in the motor grooves; each generator module comprises a primary stator, a secondary rotator and a central shaft; each primary stator is arranged on the inner wall of the corresponding motor groove; each central shaft is arranged in the center of the corresponding motor groove; each secondary rotor takes the corresponding central shaft as an axis and flows through the corresponding motor groove along with wave so as to drive the corresponding primary stator to move in the front-back direction in a reciprocating manner; and wave energy is converted into electric energy. The main panel is separated from the generator modules, design debugging and repair and maintenance in the future of an electrical control system are facilitated greatly, the power generation system is optimized, wave energy can be absorbed well, and the economic effect is good.

The invention discloses a power generation system. The power generation system comprises a high-pressure air system, a passage switching system, an air and liquid mixing system, a hydraulic power generation system and a control system; the high-pressure air system, the air and liquid mixing system and the hydraulic power generation system are connected through the passage switching system and arecontrolled by the control system; the control system changes the running state of the power generation system; the running states of the power generation system include an energy storage state and a power generation state; when the power generation system is in the energy storage state, the power generation system is used for absorbing new-energy electric power from an electric grid, transformingthe new-energy electric power into compressed air and storing the compressed air in the high-pressure air system; when the power generation system is in a power generation state, under the effect of the control system, the air energy is transformed into electric energy by virtue of the high-pressure air system, the air and liquid mixing system and the hydraulic power generation system. The power generation system ameliorates the problem that the consumption rate of renewable energy is low because the renewable energy is difficult to supply to the electric grid and is difficult to consume afterbeing supplied to the electric grid.

The invention discloses a wind power generation maximum power point tracing control method. By analyzing the mathematical mechanism of a permanent magnet synchronous wind generating set, a reasonable direct-driven permanent magnet wind generating set complete model is established, a back-to-back full power converter is controlled through bivector space pulse width modulation signals, and active power output of the generator side is adjusted and the direct current voltage of the power grid side is adjusted to be constant through a double closed-loop control loop. By means of the wind power generation maximum power point tracing control method, in the environment of low wind speed which is rated wind speed, a function curve based on the relation between wind driven generator power and rotating speed is equivalent to an isosceles triangle during large-range rough adjustment, and then accurate adjustment is achieved nearby a peak value through a Gaussian function. Therefore, the searching speed and accuracy of a maximum power point can be guaranteed while the searching range is widened, and the wind energy utilization efficiency is advantageously improved.