Droop control inverter with weak power grid fault ride-through capability and control method thereof

A technology of fault ride-through and control method, which is applied in electrical components, circuit devices, AC network circuits, etc., and can solve the problems of large inrush current and voltage of droop control inverter, and poor system stability.

Active Publication Date: 2019-07-23
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to achieve the above purpose, the present invention provides a droop control inverter with weak power grid fault ride-through capability and its control method, which solves the problem of droop control inverter surge current when the droop control inverter ...

Method used

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  • Droop control inverter with weak power grid fault ride-through capability and control method thereof
  • Droop control inverter with weak power grid fault ride-through capability and control method thereof
  • Droop control inverter with weak power grid fault ride-through capability and control method thereof

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Embodiment Construction

[0090] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0091] figure 1 It is a structural diagram of the droop control inverter grid-connected system with weak grid fault ride-through capability of the present invention, mainly including grid equivalent circuit (grid voltage u sabc , Grid side equivalent resistance R s and inductance L s ), public coupling point / grid-connected point bus (Coupling of Common Point, PCC), grid-connected circuit breaker (Circuit Breaker, CB), resistance R g and an inductance of L...

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Abstract

The invention discloses a droop control inverter with weak power grid fault ride-through capability and a control method of the droop control inverter. The inverter is composed of a three-phase half-bridge inverter circuit, an AD sampling and conditioning circuit, a DSP control module and an IGBT driving protection circuit. The DSP control module comprises: a power grid voltage phase locking unitused for acquiring the voltage phase of a PCC grid-connected point; a fault detection unit used for generating a power grid fault signal; a control mode switching unit used for switching working modes; a power outer loop control unit used for outputting a reference voltage u<od><*> and a phase [theta]d in a droop control mode; a voltage inner loop control unit used for outputting a reference current i<ldqr>; a current inner loop control unit used for outputting modulation waves; a reference current calculating unit used for calculating the voltage amplitude of the PCC grid-connected point andoutputting reference current in a current control mode; a phase tracking unit used for outputting a phase [theta]d; a current tracking unit used for outputting reference current i<ldqr>; a coordinatetransformation unit and a PWM unit.

Description

technical field [0001] The invention belongs to the control field of grid-connected inverters with energy storage micro-sources, and relates to a droop control inverter with weak grid fault ride-through capability and a control method thereof. Background technique [0002] With the rapid development of distributed power generation technologies such as photovoltaics, wind power, and energy storage, more and more distributed energy sources are connected to the grid through power electronic devices, and power electronic converters with voltage source inverters as grid-connected interfaces penetrate The distribution network is gradually changing from a rigid low impedance to a weak grid with a large impedance. On the one hand, grid-connected inverters have the characteristics of weak overcurrent capability, small inertial damping, and diverse topological structures, which bring new challenges to the safe and stable operation of power electronic power systems, such as voltage fre...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/381
Inventor 帅智康葛俊涂春鸣罗安赵慧敏沈霞何梨梨陈燕东
Owner HUNAN UNIV
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