6 results about "Asynchronous machines" patented technology

The invention relates to the technical field of power system operation control and demand side response, in particular to a power grid inertia cooperative support control method containing a multi-heterogeneous virtual energy storage unit, which comprises the following steps of: establishing a cooperative control framework; establishing a thermodynamic model of the temperature control load, and mapping thermal parameters of the temperature control load into electrical parameters of the virtual motor; establishing a control model based on a virtual asynchronous machine theory; differential multi-dimensional control configuration based on the physical characteristics of the virtual energy storage unit is executed; the virtual asynchronous machine controller selectively filters and shapes the signal, independently calculates slip frequency and generates an active power reference instruction; the power reference instruction is converted into a converter switching signal, and a virtual energy storage unit is driven to execute multi-time-scale collaborative response; and executing a desynchronized adaptive recovery strategy. According to the method, the frequency disturbance rejection capability of the power grid is effectively improved, the complementary characteristics of different types of loads are fully exerted, and the comfort level and the operation economy of a user side are considered.

The invention discloses a staged grouping method and system for a whole wind power plant fault process and electronic equipment, and the method comprises the steps: carrying out the grouping equivalence of a whole wind power plant group based on a slip ratio and an rsc inner ring proportionality coefficient of a rotor-side converter in an unreacted stage of a converter; when at least one fan action enters a crowbar protection Crowbar input-asynchronous machine stage, performing initial classification on a whole fan group based on whether the fan action exists, and performing grouping equivalence based on a slip ratio and an inner ring proportionality coefficient of a rotor side converter on the basis of an initial classification result; and when the Crowbar exits and all the fans return to the rsc control stage, keeping the grouping result until the fault is removed. According to the method, the wind power plant short-circuit current dynamic characteristics in the whole fault process can be accurately described, accurate calculation of the wind power plant short-circuit current is achieved, and technical support is provided for high-proportion new energy power system short-circuit calculation and wind power plant equivalent grouping.

A method and system for establishing an index system for evaluating power grid inertia demand, comprising: obtaining power grid inertia, including synchronous machine inertia, asynchronous machine inertia, voltage source type virtual inertia, current source type virtual inertia and static load voltage equivalent inertia; calculating the minimum value of power grid inertia under the constraint of frequency change rate; calculating the minimum value of power grid inertia under the constraint of frequency deviation; correcting the minimum value of power grid inertia under the constraint of frequency deviation using system energy storage device constraint; taking the maximum value of the two as the minimum inertia of the power grid; calculating the inertia safety domain within the evaluation period T according to the minimum inertia of the power grid; and evaluating the power grid inertia demand based on the inertia safety domain. The present application solves the problem of calculating the minimum inertia value for maintaining stable operation of the power grid under different constraint conditions according to known parameters of the power grid, comparing the calculation results obtained under different constraint conditions, and giving the inertia domain for safe operation of the power grid.

The invention relates to a squirrel-cage rotor (7) for driving an asynchronous machine (3) of a rail vehicle (1). The rotor comprises a rotor shaft (11) rotatable about a rotor axis (12), a rotor laminated core (14) connected to the rotor shaft (11) in a rotationally fixed manner and having a plurality of axially extending rotor slots (15), and a shorting cage (17) having shorting bars (18) arranged in the rotor slots (15). According to the invention, the strip cross-section (Q) of the short-circuit strip (18) has a rectangular outer region (QA) and a trapezoidal inner region (QI) connected thereto. Wherein the inner region (QI) is radially closer to the rotor axis (12) than the outer region (QA) and tapers in a radial direction towards the rotor axis (12). As a result, the squirrel-cage rotor (7) is optimized in terms of its electromagnetic properties and in terms of its mechanical strength properties.

The application discloses a unified equivalent magnetic circuit analysis and calculation method for transformers and asynchronous motors based on magnetic induction, and belongs to the field of motors and transformers. In the method, the equivalent magnetic circuits of the transformers and the asynchronous motors are composed of magnetic resistance, core loss equivalent magnetic induction and secondary phase winding (rotor squirrel cage winding in the asynchronous motor) equivalent magnetic induction. The application can intuitively and effectively reflect the fact that the primary and secondary phase windings of the transformers and the asynchronous motors are connected in the circuit insulation and the magnetic circuit, can clearly qualitatively and quantitatively represent the influence of the core loss equivalent magnetic induction of the transformers and the asynchronous motors on the magnetic flux and the phase difference, can directly calculate the parameter variables, and can draw the transformer and asynchronous motor phasor diagram based on the vector equivalent magnetic circuit.

The application relates to the technical field of electric power automation, in particular to an asynchronous control method and device of a multi-modal power system and a storage medium, wherein the method comprises the following steps: a discrete-time hidden semi-Markov jump system of the multi-modal power system is established; a mode transition probability depending on a residence time is designed according to the discrete-time hidden semi-Markov jump system; a transmission probability of an observation mode is determined according to the designed mode transition probability; a deception attack model is established according to the influence of the multi-modal power system under a deception attack; an observation mode-dependent asynchronous controller is designed based on the discrete-time hidden semi-Markov jump system and the deception attack model; and asynchronous controller parameters are determined according to the designed observation mode-dependent asynchronous controller. The method establishes a dynamic model of the multi-modal power system under an asynchronous mechanism, designs an asynchronous control strategy of the power system, and guarantees the stability of the power system.