4results about How to "Improve tracking speed" patented technology

The invention relates to a high and low orbit satellite tracking method based on geomagnetic correction. The method comprises the following steps: constructing a geomagnetic model, calculating an azimuth angle and carrying out magnetic field interference analysis; carrying out factory calibration by utilizing a three-dimensional geometric calibration mode, including horizontal correction and vertical correction; the current azimuth angle and pitch angle are continuously corrected based on the carrier coordinate system by using the signal intensity, and the deviation is obtained so as to continuously approach the real angle; utilizing the known coordinates of the three-dimensional space to inversely calculate the current position; and the current data is corrected by using the big data, so that the current data meets the use requirements. The current attitude angle and the satellite signal receiver are used for tracking the target satellite, and then the known azimuth angle is used for correcting the geomagnetic data, so that the azimuth angle precision is improved, the cost of a phased-array antenna or a mechanical antenna is reduced, the tracking precision is improved, and the tracking speed is improved.

The application discloses a photovoltaic flexible power point tracking method and system based on data driving, and the method comprises the following steps: calculating the difference between the output power of a photovoltaic array and a given reference power, and judging whether the flexible power point has been tracked based on the difference; if the flexible power point has not been tracked, applying a disturbance signal to the current output voltage of the photovoltaic array, and obtaining the output power of the photovoltaic array after voltage disturbance; estimating the gradient based on the output power of the photovoltaic array before and after disturbance; updating the output voltage of the photovoltaic array based on the gradient, the reference power, the output voltage and the output power of the photovoltaic array before disturbance; filtering the updated output voltage to obtain the voltage reference value of the photovoltaic array at the next moment; and repeating the above process until the flexible power point is tracked. The application is based on the data driving mode, and does not depend on the photovoltaic array model at all, thereby solving the problem that the photovoltaic array model is difficult to accurately establish.

The invention discloses a denitration system control method based on model predictive control and feedforward disturbance prediction. The method comprises the following steps: establishing an augmented state space model of a denitration system; parameters of the wide-state space model are increased; performing real-time rolling estimation and tracking on a state vector of the augmented state space model by adopting a Kalman filter; the inlet NOx flow is calculated to serve as a feedforward disturbance signal, and a NOx concentration disturbance sequence of the inlet of the denitration system in the future is predicted; designing a model prediction controller based on the augmented state space model, and constructing a constrained optimization problem in a limited prediction time domain; the model prediction controller solves the constrained optimization problem, feedforward compensation is carried out in the solving process through the NOx concentration disturbance sequence, and the optimal ammonia injection control quantity is predicted. According to the method, state estimation and disturbance prediction can be integrated, variable working conditions are adapted, and denitration control is optimized under constraints, so that anti-interference performance and set value tracking quality are improved, ammonia consumption is reduced, and harmful emission of nitrogen oxide is reduced.

The invention relates to the technical field of power system frequency modulation control, and discloses a boiler master control optimal advance control method and system. Extra coal quantity correction composed of the optimal advanced coal quantity increment and the compensation quantity is applied at a time during first change or trend direction switching; wherein the value of the compensation quantity is equal to the optimal advance coal quantity increment of the previous adjustment stage and is only started during direction switching; the system acquires instantaneous deviation after responding, and updates the optimal advance coal quantity increment according to the deviation only when the operation data comprises a continuous lifting and single lifting load conversion stage; according to the method, quick response, adaptive optimization and stable control are realized, and the AGC frequency modulation performance of the thermal power generating unit is remarkably improved.