37results about How to "Meet different power demands" patented technology

The invention discloses a control method and device for the voltage imbalance control of ultrahigh-voltage direct-current power transmission valve groups. The method and the device are used for regulating the valve group voltage of a series circuit consisting of two valve groups of controllable power semiconductors. According to the invention, the two valve groups connected in series and on the rectifying side are respectively equipped with current regulating units, the currents of the valve groups are used as control targets, and the two valve groups are also equipped with voltage correcting units put into use selectively. The voltages of the two valve groups are imbalanced through setting the voltage reference values of the voltage correcting units. The voltages at the two ends of the two valve groups on the inverting side are controlled by voltage regulating units, the voltage reference values of the two valve groups are set to be unequal, and the voltage imbalance running of the two valve groups is realized.

Embodiments of the present invention provide a method for equalizing the output voltage of parallel power supplies and a power supply device. The method includes: S11, isolating all power supply units connected in parallel from each other; S12, determining whether to It is necessary to adjust the output voltage, if yes, skip to S13, if not, skip to S17; S13, set the power unit whose output voltage needs to be adjusted as the adjustment object; S14, make the adjustment object output constant power; S15, increase the power according to the predetermined rule Increase the output current of the adjustment object to reduce the current output voltage of the adjustment object; S16, determine whether the output voltage needs to be adjusted according to the current output voltage of all power supply units connected in parallel, if not, restore the parallel connection of all power supply units And go to S17, if yes, jump back to S13; S17, output according to the current output voltage. The embodiments of the present invention enable the power supply units to be directly used in parallel to meet different power requirements in different occasions and improve the stability of the power supply device.

An energy management system includes a first electric energy converter with one or more first bridge arm circuits, a second electric energy converter with one or more second bridge arm circuits, and a control device. One or more first bridge arm circuits are electrically coupled to the energy-type power supply, and one or more second bridge arm circuits are electrically coupled to the power-type power supply. The control device is used to control the first and second electric energy converters to work in at least two of the following situations when the traction device is in the driving mode: when the positive demand power of the traction device is less than or equal to the positive threshold power, the first electric energy converter is activated Some or all of the first bridge arm circuits and disable all the second bridge arm circuits in the second power converter; when the positive demand power is greater than the positive threshold power, enable some or all of the first bridge arm circuits in the first power converter circuit and enable part or all of the second bridge arm circuit in the second electric energy converter. The invention also provides an energy management method and a propulsion system.

The invention provides a multi-follower based distributed energy supply system and a control method therefor, and relates to the field of electric vehicles. According to the system, a fuel supply and acquisition system is connected into a follower set and used for providing a power source for the follower set; and the follower set and a power battery are together connected into a driver control system, the power source is provided for a driver system under the control of the driver control system, then the driver system drives a load to work, and the outputs of the follower set and the power battery are controlled and coordinated through a distributed system energy management unit. According to the system and the control method, one or more followers can be controlled to be effectively combined with the power battery according to power demands to perform optimal distribution of complete vehicle energy demands so as to meet efficient running demand of the energy supply system. The invention furthermore provides the control method for the system. According to the method, the adaptive control can be performed according to characteristics of the distributed energy supply system, so that the finiteness of a single-follower scheme in efficiency optimization is overcome.

The invention relates to a variable servo valve, a power servo valve and a variable pump. The variable servo valve comprises a valve body. A power valve and a displacement valve are arranged in the valve body side by side. The power valve comprises a power valve sleeve and a power valve element. The power valve sleeve is arranged in the valve body in the manner of being capable of sliding axially.The power valve element is arranged in the power valve sleeve in the manner of being capable of sliding axially. The power valve comprises a displacement valve sleeve and a displacement valve element. The displacement valve sleeve is arranged in the valve body in the manner of being capable of sliding axially. The displacement valve element is arranged in the displacement valve sleeve in the manner of sliding axially. A feedback rod drives the power valve sleeve and the displacement valve sleeve to move so as to recover balance under the action of feedback force. A control oil port on the power valve sleeve and a control oil port on the displacement valve sleeve communicate with each other. A servo piston large chamber oil port of the power valve sleeve is controlled by the power valve element to communicate with a pressure oil port of the power valve sleeve or communicate with the control oil port of the power valve sleeve. According to the variable servo valve, the power servo valveand the variable pump, the problems that in the prior art, a displacement control device is complex in structure, large in number of parts, difficult to process or disassemble, and high in cost are solved.

The invention relates to a flexible extensible unitized solar energy cell system and solves problems of fixed power, small application scope and user operation inconvenience existing in solar energy charging equipment in the prior art. The system comprises multiple solar energy cell units and an energy storage device, wherein the solar energy cell units are provided with cell modules connected through lines and magnetic connectors, the adjacent solar energy cell units are spliced through the magnetic connectors, the cell modules of the solar energy cell units are connected in series, and the energy storage device is spliced with the solar energy cell units through the magnetic connectors to form a power source loop. The system is advantaged in that unitization is realized, expansion can be carried out, the application scope is wide, a magnetic splicing mode is employed, operation is convenient and rapid, a flexible structure is further employed, and the system is convenient to carry.