5 results about "Inertial control" patented technology

This invention provides an inertia estimation system, an inertia estimation device, a simulated inertia inverter, and a program that can calculate inertia in a power grid and control a simulated inertia inverter. [Solution] The inertia estimation system of the embodiment comprises an inertia estimation device and a simulated inertia inverter. The inertia estimation device comprises a measuring instrument database which includes at least the locations in the power system of measuring instruments that acquire measurement information used for inertia estimation, an inertia estimation unit which estimates the inertia in the power system, a setting calculation unit which calculates an inertia setting value to be set in the simulated inertia inverter, a communication unit which communicates the calculated inertia setting value, and an inertia calculation unit which calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the inertia setting value. The simulated inertia inverter comprises a simulated inertia control unit which simulates the inertial operation of a generator, an inverter communication unit which receives the inertia setting value, and a constant setting unit which sets the inertia setting value in the simulated inertia control unit.

This invention relates to the field of frequency control technology for new energy systems, and particularly to a method and system for online identification and evaluation of virtual primary frequency regulation for wind and solar turbine units. The method includes: determining the steady-state output power benchmark, maximum available power, and reserve capacity of the doubly-fed induction generator (DFIG) and photovoltaic (PV) units; collecting frequency data and active power data at the grid connection point and preprocessing them to obtain time-series data; dividing the time-series data into stages, and identifying the actual effective parameters corresponding to the virtual primary frequency regulation control components online during the steady-state frequency regulation stage; identifying the actual effective parameters corresponding to the virtual inertial control components online during the transient inertial stage; and evaluating the validity of the parameters based on the actual effective parameters, reserve capacity, and controller preset parameters to determine whether the DFIG and PV units have entered a power saturation state. This invention effectively solves the problem that existing new energy units easily enter a power saturation state under large disturbance conditions, causing theoretical control parameters to fail to reflect actual frequency regulation capabilities.

This invention discloses a frequency-safe unit combination method that considers the changes in primary frequency regulation parameters and damping ratios of wind turbines. The method includes: constructing a power system frequency response model that incorporates the frequency support of wind turbines and synchronous generators, based on the ability of wind turbines' virtual inertial control and droop control to participate in frequency regulation; performing an inverse Laplace transform on the power system frequency response model and applying Euler's formula to obtain frequency constraint expressions under underdamped, overdamped, and critically damped states; transforming the nonlinear maximum frequency deviation constraint into a linear convex constraint using a hyperplane linearization method; constructing a frequency-safe unit combination model using the virtual inertia coefficient and droop coefficient of the wind turbines as decision variables; and solving the frequency-safe unit combination model to obtain a day-ahead unit combination scheduling method. This invention significantly reduces frequency regulation costs while ensuring frequency safety by adjusting wind turbine frequency regulation parameters, thereby improving the system's ability to respond to frequency safety risks.

The application discloses a control method and system for optimizing frequency modulation of a light storage system based on fuzzy control, and belongs to the technical field of light storage system optimization. The control method for optimizing frequency modulation of the light storage system based on fuzzy control constructs an inertial droop control model, a follow-up factor change model, an output power calculation model, a fuzzy control optimization model and a light storage system coordinated frequency modulation model, and calculates a virtual inertia control participation factor and a droop control participation factor based on the influence of virtual inertia response on frequency disturbance and frequency drop time, so that the values of the virtual inertia coefficient and the droop coefficient are changed by using the virtual inertia control participation factor and the droop control participation factor, thereby the frequency modulation advantage of the energy storage can be fully exerted, the frequency stability of the power system after the wind and light electricity penetration rate is ensured, and the frequency safety and stability problem of the new energy grid-connected system is effectively solved.

This invention discloses a communication-free adaptive virtual inertial control method and device for a series-connected microgrid. The method includes: calculating active and reactive power based on the voltage and current information of the i-th inverter; obtaining the angular frequency differential term based on the active and reactive power, combined with locally acquired angular frequency, damping coefficient, rated inertia coefficient, and control coefficient; obtaining the angular frequency reference value of the i-th inverter based on the angular frequency differential term and the rated angular frequency; setting the voltage amplitude reference value of the i-th inverter to its rated value; and obtaining the sinusoidal voltage reference value of the i-th inverter; and adjusting the i-th inverter using the voltage outer loop and current inner loop based on the sinusoidal voltage reference value to achieve communication-free control of the entire system. This invention can suppress dynamic power oscillations, thereby improving the dynamic performance of the system and providing users with high-quality power.