5results about How to "Suppression frequency" patented technology

A method for synchronous excitation of multiple exciters relates to the field of dynamic testing and vibration control technology for large civil structures. The method includes the following steps: after constructing a unified time reference based on satellite navigation signals and a rubidium atomic clock, excitation amplitude and phase parameters are obtained based on the target modal requirements, and these parameters are sent to all exciter slave stations; the exciter slave stations generate a reference trajectory based on the excitation amplitude and phase parameters, enabling the exciter motor shaft angle to follow the reference trajectory in real time and output the target excitation; the phase error is obtained based on the measured excitation phase value and the reference trajectory, and then the motor angular velocity of the exciter is corrected based on the phase error. This invention solves the problems of startup phase error and long-term frequency drift in master-slave triggering schemes, ensuring synchronous start-up of all exciters. Combined with dynamic correction of the exciter motor angular velocity, it suppresses phase drift during long-term operation, significantly improving the excitation efficiency of higher-order modes and the clarity of the response signal.

The invention discloses a cooperative control method for a floating type photovoltaic-hybrid energy storage system, and the method employs a flexible connection and semi-tensioning mooring design, and is suitable for a 0-degree head wave long-period working condition. Improving maximum power tracking control, and inhibiting power point oscillation based on a partition variable step size and a prediction power algorithm; hybrid energy storage power is distributed through a low-pass filter, a storage battery and a super capacitor cooperatively process high / low frequency fluctuation, and the service life is prolonged by combining charge partition management; a virtual synchronous generator VSG adaptive control strategy is provided, an improved particle swarm optimization algorithm is adopted to optimize a J / D initial value, and frequency fluctuation is dynamically suppressed; an optical storage grid-connected system is established for verification, and the VSG technology enables the power frequency fluctuation to be quickly stabilized, thereby guaranteeing the stable operation of the system.

The application relates to the technical field of frequency regulation, in particular to a weak-network-construction energy storage frequency self-adaptive regulation method and system, and the following scheme is provided: a node state diagram reflecting device state and coupling relationship is constructed in an island operation stage, main network phase characteristics are extracted based on a common coupling point measurement signal when a grid-connected condition is met, a logical main network node carrying a phase corridor attribute is introduced, and controlled injection of a main network phase reference is realized. Further, a phase convergence diagram is formed according to traction compatibility judgment and diagram reconstruction mechanism, a traction node is subjected to competitive inhibition update through a consistency evaluation index, a grid-connected structure diagram is generated, and thus coordinated regulation of frequency parameters of multiple network-construction energy storage devices under a weak network condition is realized, and stability and controllability of a regrid process are improved.

The invention discloses a motor fault diagnosis method and system fusing order analysis and sparse sensing technologies, and aims at solving the problems that an existing model is poor in generalization ability and lacks interpretability, a vibration signal is resampled into an angular domain stationary signal, and an angle-order spectrum is generated; the method comprises the following steps of: constructing a gate control order Transform diagnosis model consisting of a Transform encoder containing an information bottleneck order gate control module (IB-OG) and a fault classifier, namely embedding the IB-OG module in a self-attention mechanism of the encoder, carrying out sparse screening on input order characteristics by utilizing a built-in microstochastic gate control mechanism, removing redundant noise and reserving key fault characteristics. In addition, class condition domain invariance constraints are introduced into the loss function, and the model is forced to align feature distribution of different working conditions in the same fault class. In conclusion, the diagnosis precision, the generalization ability and the physical interpretability of the model under the complex working condition are remarkably improved.

The invention discloses an energy storage configuration method for improving new energy bearing capacity based on collaborative optimization, which relates to the technical field of new energy power systems, and optimizes a load curve and solves initial energy storage configuration based on a Logistic function by constructing an upper-layer constant volume model; constructing a middle-layer simulation operation model, and calculating a bearing capacity upper limit by taking minimum system operation cost and maximum new energy bearing capacity as double targets; constructing a lower-layer optimization model, optimizing the configuration of the network construction type power supply and the phase modifier, and completing security constraint verification; and iteratively solving the three-layer model by adopting a generalized Benders decomposition algorithm, and outputting a global optimal energy storage configuration and new energy bearing capacity improvement result. According to the method, the load side, power side and system side strategies are optimized in a layered and collaborative manner, economy, reliability and safety are considered, and the new energy bearing and absorption capacity of the power grid is effectively improved.