Current Sharing Method Based on Lyapunov Algorithm State Variable Optimization

A technology of state variables and algorithms, applied in the field of variable optimization, can solve problems such as reactive power consumption, easy generation of harmonics, and influence on generator stable operation

Inactive Publication Date: 2020-09-29
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The present invention provides a current sharing method based on the state variable optimization of the Lyapunov algorithm, which can effectively solve the above-mentioned background technology. The domestic use of the Lyapunov algorithm to control the PWM rectifier is concentrated on the rectification of the grid voltage, which is easy to generate harmonics and consume reactive power. Power, which will affect the stable operation of the generator and reduce the reliability of the power generation system

Method used

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  • Current Sharing Method Based on Lyapunov Algorithm State Variable Optimization
  • Current Sharing Method Based on Lyapunov Algorithm State Variable Optimization
  • Current Sharing Method Based on Lyapunov Algorithm State Variable Optimization

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Embodiment

[0081] Example: such as figure 1 As shown, the present invention provides the current sharing method based on the Lyapunov algorithm state variable optimization, establishes the Lyapunov function with the quantitative relationship of the inductance and the capacitor energy storage, finds a Lyapunov function, and it is positive definite, then the Lyapunov function Under the condition that the derivative is negative definite, when the state variable parameter x of the Lyapunov function tends to infinity in any direction, the Lyapunov function also tends to infinity, and it can be concluded that the equilibrium point of the origin is globally asymptotically stable, that is, in the state variable x 3 k(I r -i o ), and then realize the three-loop control of voltage, current and current sharing;

[0082] The three-phase power supply is sequentially connected to the AC side resistor, inductor, three-phase rectifier bridge, filter capacitor and load, e a , e b , e c is the three-...

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Abstract

The present invention discloses that the Lyapunov function is established by the quantitative relationship between the inductance and the capacitor energy storage, and a Lyapunov function is found, which is positive definite, and under the condition that the derivative of the Lyapunov function is negative definite, when the state of the Lyapunov function The variable parameter x tends to infinity in any direction, and the Lyapunov function also tends to infinity, and the equilibrium point at the origin is globally asymptotically stable, that is, in the state variable x 3 k(I r -I o ), and then realize the three-loop control of voltage, current and current sharing. The structure of the invention is scientific and reasonable, and it is safe and convenient to use. The Lyapunov control algorithm is applied to the multi-three-phase permanent magnet synchronous generator system, and the unit power factor control is adopted. The AC side does not generate harmonics and consumes no reactive power, so it will not affect the stable operation of the generator and increase the reliability of the power generation system. Variables are optimized to achieve closed-loop control of current sharing information.

Description

technical field [0001] The invention relates to the technical field of variable optimization, in particular to a current sharing method based on Lyapunov algorithm state variable optimization. Background technique [0002] High-current DC power supplies with a low voltage of 10,000A or more are widely used in ships, energy and industrial fields. With the gradual increase in the integration of motor technology and power electronics technology, the integrated system of synchronous power generation is moving towards high power density, high reliability, and high The direction of fault tolerance is developing rapidly. In order to ensure the power quality of the integrated DC output system, it is necessary to focus on its control strategy. Lyapunov proposed a control theory based on stability criteria in 1892. It first constructs a "similar energy" for the system The scalar function, and then design the controller under the premise of ensuring that the function is negative to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02P9/00H02P21/00H02P103/20
CPCH02M7/12H02P9/00H02P21/0003H02P2103/20H02M1/0012
Inventor 刘金凤谭孝海刘蓝田金宁治
Owner HARBIN UNIV OF SCI & TECH
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