A single-phase converter control method and device thereof

A converter control and converter technology, applied in the field of new energy grid-connected power generation systems, can solve the problems of grid voltage frequency instability, low accuracy of active power and reactive power, etc.

CN107612046BInactive Publication Date: 2020-07-10GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-07-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a single-phase converter control method and apparatus. An active current calibration parameter K<d> and a reactive current calibration parameter K<q> are obtained according toan angular speed of a power grid side voltage of the current control period; by combination with K<d> and K<q>, an active current and a reactive current are calibrated; by combination with a power grid side active current reference value and a power grid side reactive current reference value, active current deviation delta i<d> and reactive current deviation delta i<q> can be obtained; an output voltage u<ab>(k) is obtained according to the delta i<d> and delta i<q>, and the u<ab>(k) is subjected to pulse width modulation to obtain driving pulse of each switching tube in the single-phase converter; and the power grid side parameters can be adjusted by controlling the on-off of the switching tubes. According to the single-phase converter control method, the active current and the reactive current can be calibrated through the angular speed of the power grid side voltage; and equivalently, the active power and the reactive power are adjusted through the power grid side voltage frequency,so that the allocation of the active power and reactive power can satisfy requirements of an electric power system in a condition that the voltage frequency is changed, thereby improving active and reactive power adjustment accuracy and stability in the electric power system.
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Description

technical field

[0001] The invention relates to the field of new energy grid-connected power generation systems, in particular to a single-phase converter control method and device thereof. Background technique

[0002] As the problem of global warming continues to worsen, the development of clean energy has become one of the hot issues of concern in today's society. New energy such as photovoltaic power generation and wind power generation are common clean energy sources, and their development and application have become an important way for my country's sustainable development .

[0003] In recent years, the power generation in the power grid from photovoltaic power generation, wind power generation and other power generation systems has been increasing. However, since the above-mentioned new energy depends on natural factors such as sunlight and wind power, new energy power has time-varying and uncertainties, and the new energy power generation system is quite different f...

Examples

Embodiment Construction

[0067] The core of the present invention is to provide a high-accuracy and stable single-phase converter control method and its device, which can accurately adjust the active current and reactive current when the frequency is unstable, thereby ensuring the voltage and frequency of the grid side. stability.

[0068] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0069] The present invention prov...