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Dominant dynamic elimination control system and control method for voltage-controlled inverters

A voltage control type and control system technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of uneven distribution of grid voltage, power quality, and inability to effectively damp the power fluctuation of renewable energy, and achieve the elimination of slow Effects of dynamic process, improved dynamic response, and improved control performance

Active Publication Date: 2019-10-01
SOUTHEAST UNIV
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Problems solved by technology

The grid feed-in type mainly adopts P / Q control, and most traditional renewable energy sources use voltage-following P / Q control methods to achieve maximum power output, but this control method cannot effectively damp the power fluctuations of renewable energy sources. May bring uneven voltage distribution, power quality problems and harmonic problems to the grid

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Embodiment Construction

[0066] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0067] The invention discloses a dominant dynamic elimination control method of a voltage-controlled inverter, comprising the following steps:

[0068] Step 1: For the three-phase inverter circuit with LC filter configuration, based on the time-domain state-space model, establish the time-domain state-space model of the three-phase inverter in the αβ coordinate system.

[0069] A three-phase inverter circuit with an LC filter configuration such as figure 1 shown in , where v c is the bridge arm voltage in the inverter circuit, and is the control input; R is the equivalent series resistance of each phase inductance in the inverter circuit; L and C are the phase inductance and phase capacitance in the three-phase inverter circuit; i L and u C Respectively represent the inductor current and capacitor volta...

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Abstract

The invention discloses a dominant dynamic elimination control system and control method for voltage-controlled inverters, which belong to the technical field of control of distributed power supply grid-connected inverters. The method includes the following steps: a time-domain state space model of a three-phase inverter in an alpha-beta coordinate system is established with complex variables; a compact and concise state feedback control structure based on complex variables is designed, and state feedback and feed-forward control of the system are separated to enable the closed-loop pole and the closed-loop zero of the system to be configured independently; the closed-loop pole position of the system is optimized by state feedback control in order to optimize the motion mode of state variables; and the closed-loop zero is used to offset the dominant closed-loop pole, so as to eliminate the slow dynamic process of the system. Because complex variables are introduced, the closed-loop zero of the system can be configured arbitrarily in the whole complex plane, the closed-loop zero can coincide with the dominant closed-loop pole, the dominant slow dynamic process introduced by a controller can be eliminated, and the dynamic response speed of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of distributed power grid-connected inverter control, and in particular relates to a control system and a control method for a dominant dynamic elimination of a voltage-controlled inverter. Background technique [0002] Distributed energy sources are mostly DC power sources, which often need to be connected to the grid through power electronic converters. Among them, inverter control technology has been widely used because of its smart grid support function. There are three main types of distributed power interface inverters: grid feed-in type, grid composition type and grid support type. The grid feed-in type mainly adopts P / Q control, and most traditional renewable energy sources use voltage-following P / Q control methods to achieve maximum power output, but this control method cannot effectively damp the power fluctuations of renewable energy sources. It may bring uneven voltage distribution, power qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382H02J2203/20
Inventor 全相军祁晓婧吴在军窦晓波胡秦然
Owner SOUTHEAST UNIV
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