7results about How to "Guaranteed frequency stability" patented technology

The invention discloses a shared energy storage frequency adjusting method and system based on deep reinforcement learning. The frequency regulation method comprises the following steps that an LFC model of multiple microgrids is established, frequency response and power balance under physical constraints and frequency modulation constraints of the multiple microgrids are simulated according to the LFC model, and the multiple microgrids comprise a shared energy storage system; establishing an objective function satisfying the power balance in consideration of the frequency response and the cost; and establishing a frequency modulation framework based on intelligent power generation control of the DRL, generating a control instruction meeting the target function according to the state information of the LFC model based on a Markov decision, and executing the control instruction by the frequency modulation framework to perform frequency modulation. The method is specially used for the micro-grid with the shared energy storage system, aims to improve the performance and economical efficiency of frequency regulation through an intelligent optimization algorithm, and has the characteristics of cost reduction and high efficiency.

The application discloses a low-noise high-precision voltage control current source for a semiconductor laser, comprising a voltage control signal generation module, a PID control module and an output current sampling and feedback module, wherein the voltage control signal generation module receives a host computer instruction and generates a voltage control signal of an output current; the PID control module receives and processes the voltage control signal generated by the voltage control signal generation module and the feedback voltage generated by the output current sampling and feedback module, generates a control voltage to control the output current of the output current sampling and feedback module; and the output current sampling and feedback module provides a stable output current for a load and provides the amplified voltage quantity of the current feedback compared with the voltage control signal to the PID control module to provide the feedback voltage for the PID control module. The application can realize accurate and stable current output, the output current is adjustable, and the application can provide stable low-noise high-precision driving current for semiconductor lasers and the like.

The application relates to the technical field of power systems, and discloses a power system source-network-load-storage collaborative intelligent planning system, which obtains the power grid load value of a target power grid at fixed time intervals; carries out discrete wavelet transform processing on the time-series power grid load value to obtain M time-scale wavelet coefficients, and constructs a corresponding fractal elastic demand kernel in combination with a preset fractal order; obtains the energy storage value of each energy storage device in the nth physical node and the phase angle of each energy storage device at fixed time intervals, and determines the inertia vector phase field of the nth physical node in combination with a preset angular frequency; constructs a synchronous offset matrix based on the inertia vector phase field of each physical node and the fractal elastic demand kernel of each time scale; and constructs a target function in combination with the synchronous offset matrix based on the energy storage unit cost and the response unit cost, so as to determine the energy storage configuration and demand response strategy of each physical node.

The application provides a communication frequency selection method and system based on multi-factor heuristic adaptive scoring, which first initializes a candidate frequency point set and related parameters, and then collects channel state parameters of each frequency point in each decision time slot. After normalization processing, the collected parameters enter the EWMA history smoothing link to obtain more stable frequency point evaluation results. According to the current communication environment, corresponding weight configuration is selected, and the comprehensive heuristic score of each selected frequency point is calculated. If the SINR of the current working frequency point is lower than the set threshold or the packet loss rate is higher than the set threshold, the fast reselection mechanism is triggered to directly select the frequency point with the better score; if the fast reselection mechanism is not triggered, the regular hysteresis judgment is entered, and only when the selected frequency point has sufficient score advantage over the current frequency point and overcomes the switching cost, the frequency switching is performed, thereby improving the stability of the communication frequency selection.

A dynamic frequency control method for a fan considering weight coefficient and rotor energy state includes the following steps: determining whether the fan participates in frequency regulation; if the system frequency deviation is greater than the set frequency regulation dead zone range and the fan rotor speed is greater than the minimum speed, virtual inertia control is started; otherwise, virtual inertia control is not started; virtual inertia control weight coefficient is introduced l d and virtual droop control weight coefficient l p , and according to △ f and d f / d t Adjust the size of the two according to the change; introduce the kinetic energy feedback coefficient and dynamically adjust the virtual inertia control coefficient according to the energy state of the fan rotor. K df and virtual droop control coefficient K pf According to the system frequency change, the fan virtual inertia control is locked, so that the fan can quickly restore the speed while ensuring the stability of the system frequency. The present invention can dynamically adjust the virtual inertia control parameters according to the system frequency change and the fan rotor kinetic energy reserve, so that the fan can fully participate in the frequency response while avoiding excessive deceleration of the rotor, effectively enhancing the system frequency stability capability.

The invention provides a system distribution and storage method considering an energy storage frequency support characteristic, and the method comprises the steps: firstly, building a target function with the minimum annual operation cost of a system based on a power system unit combination operation constraint and a short-time frequency safety constraint; and secondly, considering frequency response characteristics of energy storage in short-time frequency security constraints, adding an energy storage capacity planning equation, constructing a target function with the minimum energy storage capacity, and finally, comprehensively solving to obtain an optimal energy storage planning scheme. According to the method, the safety requirement of the system for the energy storage frequency supporting effect can be accurately determined, the optimal energy storage investment capacity is decided, and therefore the inertia and frequency stability of the power system is enhanced through the energy storage technology.

This invention belongs to the field of power electronic conversion and microgrid control technology, specifically involving a synchronous control method for grid-connected / off-grid switching of an islanded microgrid based on a virtual generator. The method includes transforming the three-phase voltage signals from the microgrid side and the grid side from a three-phase stationary coordinate system to a two-phase stationary coordinate system, obtaining orthogonal components of the microgrid voltage and grid voltage. These orthogonal components are then substituted into a calculation formula to obtain a real-time phase difference signal. This real-time phase difference signal is then fed into a regulator for proportional-integral and filtering processing to generate a phase compensation coefficient. This phase compensation coefficient is then superimposed onto the active frequency control loop of the virtual synchronous generator to correct the phase angle of the virtual synchronous generator's output voltage. This achieves the goal of maintaining the simplicity of the non-phase-locked loop structure while reducing the inrush current during grid-connected / off-grid switching.