116 results about "Inertial control" patented technology

A Head-tracker is built into a headset computer as a user input device. A user interface navigation tool utilizes the head tracking but with inertial control. The navigation tool is formed of two different sized circles concentrically depicted, and a pointer. The pointer is moveable within the two circles defining inner and outer boundaries. The pointer represents user's head position and movement sensed by the head tracker. The HSC displays a document and pans (navigates) the document as a function of user head movement sensed by the head tracker and illustrated by the navigation tool. The direction of movement of the pointer depicted in the navigation tool defines pan direction of the displayed document. Pan speed of the displayed document is defined based on position of the pointer, with respect to the inner and outer circle boundaries in the navigation tool.

The invention discloses a virtual double-fed induction generator inertia control method coordinated with secondary frequency regulation, which solves the problem of cooperation between the virtual inertia control of a wind turbine generator and the secondary frequency regulation of a power system. On the basis of an original virtual inertia control module, a module which is coordinated with the secondary frequency regulation of a power system is added, so that the overall frequency regulation effect is increased. Moreover, in the added module, the rotational speed of the rotor of the wind turbine generator is considered, so that the wind turbine generator can continuously operate within a safe rotational speed range; the problem of the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is solved; because the affection of system frequency fluctuation on the active regulation capability of the wind turbine generator is great, in order to ensure that the double-fed induction generator has better frequency regulation capability, the steady-state frequency response of the wind turbine generator is optimized, and moreover, accordingly, a control strategy is designed, so that the frequency regulation effect of the wind turbine generator is increased to a certain degree.

The invention discloses a method for controlling a wind turbine to participate in power grid frequency modulation based on virtual inertia and a pitch angle. The method comprises the following steps:when a frequency deviation exists between the rated power of a system power grid and the current frequency, calculating a proportionality factor of a tracking curve of the sub-optimal rotating speed-active power of the wind turbine under the control of the virtual inertia; calculating a reference power of an inverter at a rotor side under the control of the virtual inertia; calculating an introduced electromagnetic power at the rotor side inverter according to the frequency change rate, and accumulating the introduced electromagnetic power and the reference power to obtain a total electromagnetic power of the rotor side inverter; calculating the rotating speed deviation of the wind turbine, and adopting the rotating speed deviation of the wind turbine to calculate the electromagnetic powervariation of the rotor side inverter; obtaining an active power of a pitch angle mechanism according to the total electromagnetic power and the electromagnetic power variation, and calculating the pitch angle of the pitch angle mechanism by adopting the active power of the pitch angle mechanism; and controlling the wind turbine to increase captured wind energy and inject the active power into thepower grid according to the pitch angle.

The invention discloses a wind farm direct current grid connection and direct current transmission source net coordination control method. The wind farm direct current grid connection and direct current transmission source net coordination control method comprises steps that LCC-HVDC additional control is additionally provided, and power-frequency slope characteristics provided with dead zones and inertia control are introduced in LCC-HVDC rectifier station fixed power control, and then transmitted power is capable of responding to frequency of a sending-end power grid; VSC-HVDC additional control is additionally provided; draught fan additional control is additionally provided, and active-frequency slope characteristic and the inertial control are introduced in draught fans, and then active power output by the draught fans is capable of responding to changes of WFVSC side frequencies; coordination of controllers is additionally provided, proper motion dead zones are arranged, and then the various controllers are coordinated. By increasing the power-frequency statistic characteristic coefficient and the inertia response coefficient of the system of the sending-end power grid, the inertia of the sending-end power grid is increased, and the frequency stability of the system is improved.

The invention discloses a primary frequency modulation control method and system for a wind power plant. A wind power plant power distribution strategy by using overspeed load shedding control is used. The method comprises the steps that: after a wind power plant receives a system scheduling instruction, power requiring load shedding is calculated according to wind speed information fed back by all wind turbine generators, a power reference value and a load shedding control mode are distributed to all single machines, rotor kinetic energy of the wind turbine generators is stored to the maximumextent, and the frequency dynamic characteristic of a system is improved; and a variable parameter control strategy is utilized in frequency modulation control, the control strategy can ensure that afan can release the maximum standby power in the frequency modulation process, and the recovery speed after frequency drop is increased. It is guaranteed that each fan sufficiently releases standby power in the frequency modulation process, and a frequency steady-state value is effectively increased. The change of an inertia control coefficient can effectively improve the recovery speed of the frequency.

The invention provides a method for enabling a wind power unit to participate in primary frequency modulation of a power system at different bands, relates to a technology for enabling the wind power unit to participate in primary frequency modulation of a power network and aims at solving the problem of the contradiction between the wind farm economy and the frequency modulation capacity when the wind power unit participates in primary frequency modulation. The method comprises the steps of firstly separating a high-frequency signal and a low-frequency signal in the power network by using a high-pass filter and a low-pass filter respectively; introducing an inertial control link and a droop control link into the wind power unit and setting an operation mode according to a current wind curtailment condition of a wind farm, wherein the operation mode is an optimal power tracking mode or a suboptimal power tracking mode; and finally calculating electromagnetic power reference values under two operation modes respectively, enabling the electromagnetic power reference values to act on a rotor converter and completing the process that the wind power unit participates in primary frequency modulation of the power system at different bands. According to the method provided by the invention, the target that the wind power unit participates in primary frequency modulation of the power system to the maximum extent when output is not lost is achieved, and the method is suitable for frequency modulation of the wind power unit.

The present invention discloses a voltage and current double closed loop control method and device of an adjustable invertor inertial effect. In the frame of the routine voltage and current double closed loop control, the inertial current component is added in an inverter current inner ring instruction to realize the equivalent control of the inverter inertia property and is indirectly generated through an inertial control system connected in parallel on the voltage outer ring. The inertial control system is formed by three parts connected in series, wherein the three parts include a low pass filter, a proportional controller and a differential arithmetical unit. The size of the inertial current component and the intensity level of the grid-connected inverter inertial effect can be flexibly controlled through the proportional controller in the inertial control system. The voltage and current double closed loop control method of the adjustable invertor inertial effect does not need to change the hardware portion of the current grid-connected inverter system, completely maintains the current basic control frame of the software portion, has good compatibility, can be applied to a double-fed wind turbine system and a photovoltaic power generation system, and has good engineering application values.

The invention discloses an inertial control active suspension control system based on vehicle posture deviation, which comprises a vehicle body, an inertial measurement unit, a plurality of wheels, suspension servo actuating cylinders corresponding to the wheels one by one, and a displacement sensor, an electronic control unit and a servo controller group. When the number of wheels in the group ismore than 1, the upper cavity and the lower cavity of the suspension servo actuating cylinders of the wheels in the group are communicated respectively, so that the wheels in the group become a fulcrum for jointly supporting the vehicle body. Three groups of wheels form three fulcrums, the invention controls the posture of the vehicle body according to the principle that three points determine aplane, according to the changes of vertical displacement, pitch angle and roll angle of the vehicle center of mass, the expansion and contraction of each suspension servo actuator cylinder are controlled, so that the vehicle center of mass moves along a straight line or an arc line and the vehicle posture remains unchanged as far as possible, so that the vibration of the vehicle body is reduced, and the speed, the handling stability and the ride comfort of the vehicle are improved when the vehicle is traveling on the complex road surface.

The field of the invention is that of solid-state laser gyros used in inertial control units. However, there are certain technical difficulties in producing laser gyros of this type that are due partly to the fact that the counterpropagating waves interfere with each other in the amplifying medium. A laser gyro according to the invention comprises at least one solid-state amplifying medium and an optical ring cavity comprising first optical means for imposing a first linear polarization state common to the two counterpropagating optical waves at the entrance and exit of the zone containing the amplifying medium and second optical means for imposing, within the amplifying medium, a second linear polarization state on the first optical wave and a third linear polarization state on the second optical wave, these polarization states being perpendicular. Thus, all the drawbacks associated with interference are eliminated.

The invention discloses a coordinated control method for a water hammer effect of a wind power compensation hydraulic turbine. The coordinated control method includes the steps of S1, judging whetherthe change amount of a grid frequency is greater than a given value, and if so, performing a step S2; S2, a fan responding to the change in the grid frequency, and based on a virtual inertia control link, obtaining a first compensation power reference value Pf; S3, judging whether the guide vane opening of a hydraulic turbine changes, and if so, performing a step S4; S4, the fan responding to thechange of the guide vane opening of the hydraulic turbine, and based on a new additional control link, obtaining a second compensation power reference value P[mu]; and S5, acquiring the fan compensation power reference value total amount PTe-ref according to the first compensation power reference value Pf and the second compensation power reference value P[mu]. With the coordinated method of the virtual inertial control and the new additional control, the fan sends out a power shortage for compensating the water hammer effect, the deterioration of the grid frequency is effectively suppressed,and secondary fluctuations in the grid frequency caused by the water hammer effect can be avoided.

An access system for a building structure includes an access opening formed in the structure and a horizontally oriented track extending across the opening. Panels are slidably mounted on the track. A pulley—track system opens and closes the panels. The system is controlled with a manually operated control panel mounted on the building structure.

The invention discloses a control strategy for assisting a new energy power station to participate in system frequency modulation through energy storage, and belongs to electric power generation field, the invention aims to provide a control strategy with advantages of inertia control and droop control, and different control strategies can be adopted to adjust the output of the energy storage system in different time periods of frequency modulation; the method comprises the following steps: (1) dividing system frequency change into different time periods: recording a moment when the system frequency fluctuates and exceeds an allowable range as t0, recording a moment when the frequency fluctuation reaches a maximum value as tm, and recording a moment when the frequency gradually recovers toa normal range as ts; (2) taking t0 as a moment when energy storage starts to participate in primary frequency modulation, and adopting inertia control to participate in power grid frequency modulation in energy storage based on an inertia control model at a stage from t0 to tm; and in the tm to ts stages, converting the control mode of energy storage into droop control from inertia control. Theoutput of the energy storage system can be adjusted by adopting different control strategies in different frequency modulation periods, and the frequency modulation effect is better by shortening thefrequency response time of the system.

The invention discloses a frequency modulation method, a device, a device and a medium of a wind turbine generator system. Under the ultra-low wind speed mode, the frequency modulation is controlled by a flywheel energy storage frequency modulation control module. In the low wind speed mode, the flywheel energy storage module still participates in frequency modulation, the overspeed load sheddingcontrol in the integrated load shedding control module plays a role, and the droop control and virtual inertial control participate in frequency modulation. In medium wind speed mode, overspeed load shedding control and variable pitch control are used to control frequency modulation, sag control and virtual inertia control. In high wind speed mode, variable pitch control FM, droop control and virtual inertia control are used to control FM. Frequency modulation is realized by coordinating and coordinating all kinds of control links under different wind speed modes, so that the frequency of thepower network is stable.

The invention discloses a control method for realizing pressure and frequency regulation of wind turbine generator. Based on the control system of original wind power converter, the method adds pressure and frequency regulation ring of droop control and virtual inertial control. The realization of the project is quite simple and easy to operate, to make the wind turbine generator able to provide certain reactive and active power support in state grid fault, which improves stability of the system.

The invention discloses a time-sharing coordination control method and a time-sharing coordination control system for MPPT operation of a PMSG fan, and relates to the technical field of wind power generation. The main points of the invention are that constant direct-current voltage control of a power grid side converter controls frequency modulation of the PMSG fan according to a direct-current voltage reference value; the fixed power control of the generator side converter controls the frequency modulation of the PMSG fan according to the power reference value after the virtual inertia control of the rotor is added; the fixed power control of the generator side converter controls the PMSG fan to modulate frequency according to the new power reference value after droop control is added; according to the frequency deviation range covered by the DC capacitor virtual inertia control, DC capacitor electrostatic energy participates in frequency adjustment through the DC capacitor virtual inertia control, and rotor kinetic energy participates in the priority of frequency adjustment through the rotor virtual inertia control and the self-adaptive droop control. The wind energy lost by thefan due to participation in frequency adjustment can be reduced, the utilization rate of the wind energy is increased, the wind energy lost by the fan due to frequency modulation is reduced, and time-sharing coordination control is superior to simultaneous coordination control.