32results about How to "Fast load response" patented technology

There are provided a switching power supply device performing a stable operation with fast response, a semiconductor integrated circuit device, and a power supply device. A capacitor is provided between the output side of an inductor and a ground potential. A first power MOSFET supplies an electric current from an input voltage to the input side of the inductor. A second power MOSFET turned on when the first power MOSFET is off allows the input side of the inductor to be of a predetermined potential. A first feedback signal corresponding to an output voltage obtained from the output side of the inductor and a second feedback signal corresponding to an electric current flowed to the first power MOSFET are used to form a PWM signal. The first power MOSFET has plural cells of a vertical type MOS-construction. The number of cells is 1/N. A detection MOSFET in which the gains and the drains are shared over the same semiconductor substrate with the first power MOSFET is provided to form a second feedback signal.

The invention discloses a thermodynamic system and a regulation and control method for rapid load responses of a heat supply unit. The technical problems that an existing thermodynamic system is poorin stability and high in cost are solved. The system is based on the heat supply unit, and the heat supply unit comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressurecylinder and a generator which are sequentially connected. A medium-low-pressure communication butterfly valve is arranged between the medium-pressure cylinder and the low-pressure cylinder and is used for regulating the flow of steam entering the low-pressure cylinder. A heat supply steam outlet is formed between the medium-pressure cylinder and the medium-low-pressure communication butterfly valve, and a steam extraction butterfly valve is arranged on a steam extraction pipeline and is used for adjusting and controlling the flow of steam entering a heat supply network heater. The system isused for rapidly responding to AGC load instructions and primary frequency modulation instructions through the heat supply unit. The steam extraction device and a heat supply network system are adjusted through the heat supply unit, the instantaneous heat supply steam flow of the heat supply unit is quickly changed, and the instantaneous thermoelectric ratio of the whole unit is adjusted, so thatthe quick responses to power generation loads of the unit are achieved.

The invention discloses a self-adaptive undisturbed switching device of a steam-driven induced draft fan in a heat-engine plant. The self-adaptive undisturbed switching device of the steam-driven induced draft fan in the heat-engine plant comprises a control signal main center device, an undisturbed switching unit, a stationary blade server, a rotating speed server, the induced draught fan and a small steam engine. The control signal main center device calls running data in a data collecting system of the heat-engine plant, and transmits the called running data to the undisturbed switching unit, the undisturbed switching unit carries out judgment of switching control over the opening degree of stationary blades of the induced draft fan and the rotating speed of the small steam engine on the received data, and transmits control instructions after the judgment to the stationary blade server and the rotating speed server, and the stationary blade server and the rotating speed server act according to the received control instructions to control the induced draught fan and the small steam engine respectively, wherein the stationary blade server is used for controlling the opening degree of the stationary blades of the induced draft fan, and the rotating speed server is used for controlling the rotating speed of the small steam engine. The self-adaptive undisturbed switching device of the steam-driven induced draft fan in the heat-engine plant is accurate, efficient and capable of carrying out automatic control according to the real-time running parameters of different induced draft fans and different heat-engine plants.

The invention provides a screw type water chilling unit and a control method and system thereof. The screw type water chilling unit comprises a condenser, a cooling water flow path, an evaporator, a chilled water flow path, a heat exchanger, a valve, a sensor group and a controller; cooling water of the cooling water flow path flows through the condenser; chilled water of the chilled water flow path flows through the evaporator; the heat exchanger is used for heat exchange between output chilled water and output cooling water; the valve is used for adjusting the flux of the cooling water entering the heat exchanger; the sensor group is used for detecting the temperature of the output cooling water and the temperature of input chilled water and the output chilled water; and the controller is used for controlling the valve and/or the heat exchanger according to the temperature of the output cooling water and the temperature of the input chilled water to regulate the temperature of the output chilled water and regulating the output load of the water chilling unit. By additionally arranging the heat exchanger and the valve in the water chilling unit, the output cooling water is used for adjusting the temperature of the output chilled water, the compressor does not need to be shut down, the water chilling unit can further reduce the output load range, or even zero load output is realized, and the technical problem that an existing screw type water chilling unit cannot achieve zero load output in the event of non-stop is solved.

The invention provides a photovoltaic power station and hydropower station combined operation system. The system is established through the method which comprises the steps that first, the output feature of photovoltaic power generation is measured and analyzed; then the output feature of photovoltaic power generation and the power generation feature of a hydropower station are combined, and according to the water balance theory, the influence on a hydropower station downstream power station from established combined operation system is analyzed; the influence on a power grid from the system is analyzed again; the scale of a photovoltaic power station connected into the hydropower station is computed again, and the operation situation of a water-turbine generator set of the hydropower station in the combined operation system is analyzed; and finally the combined operation system is formed. The invention further provides an operation method of the combined operation system. By setting a control method that the hydropower station is used for compensating the photovoltaic power station, an AGC and AVC control method and a water balance testing method, the combined operation system operates. The advantages of high adjusting capacity and high adjusting speed of the hydropower station are used, the photovoltaic power station with high volatility is subjected to compensation, and the combined operation system can provide power for a power grid stably.

A turbocharging arrangement for an internal combustion engine, the arrangement having a turbocharger with a turbine and a compressor connected to a common shaft in a rotationally fixed manner, an electric motor, and coupling means for coupling the electric motor to the shaft of the turbocharger. The coupling means is arranged to steplessly adjust the torque transmitted between the electric motor and the turbocharger. A method for operating a turbocharged internal combustion engine is also provided.

The invention provides a power grid coordination control method based on hydroelectric power-photoelectricity complementation. The method comprises the following steps of: predicting the photoelectricdaily output of photovoltaic power stations around a hydropower station, and obtaining a first photovoltaic daily output curve; obtaining a rated daily output curve of the hydropower station; establishing a hydroelectric power-photoelectricity complementation daily scheduling model, determining an objective function, a constraint condition, a first photovoltaic daily output curve and a rated daily output curve of the power station of the model, and obtaining a first hydroelectric power-photoelectricity complementation total output curve through the hydroelectric power-photoelectricity complementation daily scheduling model; obtaining the actual photoelectric daily output of the photovoltaic power station, and obtaining a second photovoltaic daily output curve; and generating a second hydroelectric power-photoelectricity complementary total output curve through the hydroelectric power-photoelectricity complementation daily scheduling model on the basis of the rated daily output curve of the hydropower station and the second photovoltaic daily output curve, and iteratively adjusting the effective output of the hydropower station according to the first hydroelectric power-photoelectricity complementation total output curve, so as to make the shape of the second hydroelectric power-photoelectricity complementation total output curve to be consistent with that of the first hydroelectric power-photoelectricity complementation total output curve.

The invention discloses a control method and device of a PCCM (Pseudo Continuous Conduction Mode) Boost converter. The control device comprises a pulse generator, a voltage comparator, a current comparator and a pulse selector, and is characterized in that the pulse generator generates four groups of pulses with the same frequency and different duty ratios for the pulse selector to select, the voltage comparator compares the output voltage with the reference voltage, the current comparator compares the output current with the reference current, and output signals of the pulse generator, the voltage comparator and the current comparator are used as input signals of the pulse selector so as to select the pulses for driving the PCCM Boost converter, so that the control for the converter is realized. The application of the invention reduces the output voltage ripple of the PCCM Boost converter, and improves the transient performance and steady-state performance of the converter at the sametime.