35results about How to "Suppress output fluctuation" patented technology

The invention provides a wireless and wired charging switching device of an electromobile. The switching device comprises a power module and a charging module of the electromobile, wherein the power module and the charging module are connected. The power module comprises a power grid, a first control switch, a second control switch, a high-frequency power source, a battery charger and an energy transmitting coil system, wherein the first control switch and the second control switch are respectively connected with the power grid, the high-frequency power source is connected with the first control switch, the battery charger is connected with the second control switch, and the energy transmitting coil system is connected with the high-frequency power source. The charging module comprises a master control system connected with the second control switch, and an energy receiving system connected with an energy transmitting coil, wherein the energy receiving system is connected with a battery through a rectifying and voltage stabilizing system, and the master control system is connected with the battery through a power detection module; the battery charger is connected with the battery, and the control system sends signals to the first control switch and the second control switch. According to the device, wireless charging is combined with wired charging, a user can select a charging mode at will, and the electromobile can be charged more flexibly, more conveniently and faster. Stability of wired charging is achieved, and the effect for reducing impact on the power grid under the wireless charging condition is also achieved.

The invention discloses a plant network coordination method for exciting the combined operation of a wind power plant and a pumped storage power station and a combined dispatching method thereof. Themethod comprises the steps of firstly, providing a plant-network coordination mechanism for exciting the combined operation of the wind power plant and the pumped storage power station from the requirements of stable operation of a power grid and income improvement of a power generator; on the basis, carrying out modeling analysis on the uncertainty of wind power output, fully considering the operation characteristics of the pumped storage power station, constructing a wind power-pumped storage power station coordinated operation mixed integer programming model with the maximum complex power generation income as the target, and then using an optimization solver for solving the model. By the adoption of the method, the combined dispatching of wind power and pumped storage can effectively restrain the output fluctuation of the wind power, the risk of wind curtailment of a power grid is greatly reduced, and meanwhile the power generation income of a wind power plant-pumped storage power station combined body is remarkably increased.

It is an object to effectively output electrical energy of a storage battery to an electrical power system serving as a whole distributed power supply system by effectively utilizing the electrical energy within a charging ratio range that does not cause overcharging or overdischarging of the storage battery. In a hybrid distributed power supply system, the target supply electrical power is set based on the electrical power generation output of the electrical power generator and the charging state of the storage battery, and the target supply electrical power is restricted within a predetermined permissible supply electrical power range when the target supply electrical power deviates from the predetermined permissible supply electrical power range.

An angular velocity sensor includes fixing units, a base portion, beam portions that support the base portion with respect to the fixing units, driving vibrating arms connected to the base portion, and detection vibrating arms connected to the base portion. When a width of a detection frequency band is set to f1 [Hz], a resonance frequency in a rotational vibration mode in which the base portion rotates and vibrates around a detection axis with respect to the fixing units in association with the deformation of the beam portions is set to f2 [Hz], and a detuning frequency is set to f3 [Hz], the relation of f1<f2<f3 is satisfied.

A magnetic recording medium having a non-magnetic support, at least one primer layer on one surface of the support, a magnetic layer on the primer layer and a back coat layer on the other surface of the non-magnetic support, in which the support has a thickness of 2 to 5 μm, the surface roughness (Ra) of the support on its surface carrying the primer layer and the magnetic layer is from 2.5 nm to 20 nm, the thickness of the primer layer is 1.5 μm or less, and the primer layer contains 2 to 30% by weight, based on the weight of all inorganic powder in the primer layer, of alumina powder having a particle size of 0.01 μm to 0.1 μm.

The invention relates to a wind power pumped storage scheduling method considering conditional risk and uncertainty. The method comprises the following steps: constructing a nonlinear pumped storage model; converting nonlinearity into linearity, and simplifying a pumped storage model; coping with the uncertainty of wind power output, and obtaining an uncertainty set of the wind power output; measuring the value-at-risk caused by the uncertainty of the day-ahead electricity price; and formulating a corresponding scheduling strategy by taking system income maximization as a target. According to the method, pumped storage and new energy can be matched for power generation, fluctuation of wind power output is restrained, a corresponding scheduling strategy is formulated, the income of the system is guaranteed, and high economical efficiency is achieved.

A magnetic head device which suppresses output fluctuation even though the output changes in part of an output waveform from the magnetic head. The magnetic head device includes a magnetic head for reproducing information recorded in a magnetic information recording medium; an amplifier section for amplifying a reproduced signal that the magnetic head has reproduced, by using a gain; an A/D converter section for converting the reproduced signal that has been amplified, to a digital signal, by sampling the signal at predetermined intervals, in order to output the converted digital signal; a signal comparator section for comparing a digital signal output value with a predetermined output criterion value; and a gain control section for adjusting the gain in such a way as to make the output value closer to the output criterion value, in the case where the output value is either greater or smaller than the output criterion value.