Adaptive adjustment inverter controller

An adaptive adjustment and inverter technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems that the controller cannot be guaranteed to be stable, and it is difficult to cover the operating state of the inverter.

Active Publication Date: 2020-03-13
STATE GRID SICHUAN ECONOMIC RES INST
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AI Technical Summary

Problems solved by technology

In practice, these controller parameters are often selected through simulation and trial and error, which is difficult to cover all possible operating states of the inverter, and it is also impossible to guarantee that the designed controller can maintain stability in a complex operating environment.

Method used

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  • Adaptive adjustment inverter controller
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Embodiment

[0060] like figure 2 As shown, an adaptive adjustment inverter controller of the present invention includes a dq conversion module, a module for calculating the effective value of output active and reactive power and terminal voltage, a module for calculating the amplitude of modulated wave signals, a module for simulating the rotor motion equation, and a reinforcement learning control module module, dq inverse transformation and PWM modulation module:

[0061] dq conversion module: used to convert the three-phase voltage e of the capacitor on the LC filter of the inverter a 、e b 、e c and the three-phase current i flowing on the inductor a i b i c , decomposed into the synchronous rotating coordinate system of the inverter to obtain its dq axis component u d , u q and i d i q .

[0062] Output active and reactive power and RMS terminal voltage calculation module: the calculation formula is shown in formula (1):

[0063]

[0064] In the formula, P is the active p...

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Abstract

The invention discloses a self-adaptive adjustment inverter controller. The inverter controller comprises a dq conversion module, an output active and reactive power and terminal voltage effective value calculation module, a modulation wave signal amplitude calculation module, a rotor motion equation simulation module, a reinforcement learning control module and a dq inverse transformation and PWMmodulation module. The inverter controller simulates a synchronous generator rotor motion equation, and adjusts the virtual moment of inertia and the damping coefficient on line through the reinforcement learning control module so as to obtain a good power system low-frequency oscillation suppression effect.

Description

technical field [0001] The invention relates to the technical field of power electronic inverters, in particular to an adaptive adjustment inverter controller. Background technique [0002] In view of the pressure of energy and environmental protection, more and more renewable energy is connected to the grid through power electronic power generation equipment. As a power conversion device capable of converting direct current into alternating current, inverters have been widely used in wind power, energy storage, photovoltaics and other fields. The earliest inverter control strategy adopted a double-layer control structure, that is, the inner layer is the current loop, and the outer layer is the power loop or voltage loop. However, the response speed of this control strategy is fast, which is not conducive to the frequency stability of the power system, and it cannot adaptively adjust the output power of the inverter according to the voltage and frequency of the system. The...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 魏俊叶圣永张玉鸿韩宇奇刘旭娜张文涛赵达维李达吕学海陈博
Owner STATE GRID SICHUAN ECONOMIC RES INST
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