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Control method for double closed-loop cascade in synchronous revolution coordinates system

A technology of cascade control and rotation coordinate transformation, applied in active power filtering, AC network to reduce harmonics/ripple, harmonic reduction devices, etc. The effect of measuring the low utilization rate of voltage and solving the harmonic problem

Active Publication Date: 2012-11-28
博格华纳新能源(襄阳)有限公司
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Problems solved by technology

However, this method generally uses SPWM (sinusoidal triangle wave PWM), and the DC side voltage utilization rate is low, which puts forward higher requirements for the selection of power devices

Method used

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  • Control method for double closed-loop cascade in synchronous revolution coordinates system
  • Control method for double closed-loop cascade in synchronous revolution coordinates system

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Embodiment Construction

[0017] The following is attached figure 1 The invention is further explained and examples of the invention are given.

[0018] This double closed-loop serial control method of voltage, outer loop and current inner loop under the synchronous rotating coordinate system adopts a double closed-loop cascade control strategy of voltage outer loop and current inner loop, and through phase-locking and rotating coordinate transformation, the outer It is composed of loop voltage regulation, power grid voltage feedforward, command extraction, inner loop current regulation, and three-dimensional space vector generator collection processing.

[0019] (1) Realization of outer loop voltage loop regulation

[0020] Compare the sum of the Udc-1 and Udc-2 voltages with the total voltage given Udc-r, and generate the d-axis command current idcd for controlling the total reference voltage of the DC side through the voltage outer loop regulator 3; for Udc-1 and Udc The -2 voltage difference is c...

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Abstract

The invention relates to a double closed-loop cascade control method based on synchronous rotating coordinates, which adopts a double closed-loop cascade control policy with an outer voltage loop and an inner current loop, transforms through a phase locking and rotational coordinates, and comprises the steps such as outer loop pressure regulation, network voltage feedforward, instruction extraction, inner loop current regulation, three-dimensional vector generator collection processing, etc. The double closed-loop cascade control method not only solves the harmonic problem which commonly exists in the comprehensive application of the power electronic technology very effectively, but also overcomes the problem that the utilization ratio is low when measuring the voltage by using a direct current in the existing three phase four wire type active power filter system, thereby creating the technical support for the lectotype range expansion of power devices and safety of all devices of theentire running network system at the same time.

Description

technical field [0001] The invention relates to a solution to reactive power compensation and harmonic current, in particular to a double-closed-loop cascade control method for a voltage outer loop and a current inner loop under a synchronous rotating coordinate system, belonging to the technical field of active power filtering. Background technique [0002] With the development of power electronics technology and industrial technology, various power electronics devices: such as converters, transformers, motors, generator variable speed transmission equipment, electric arc furnaces, welding equipment and other nonlinear loads, have been widely used in electric power, Metallurgy, mining, iron and steel, chemical industry and other fields. The application of these power electronic technologies and related equipment has produced huge economic benefits on the one hand, and on the other hand, the resulting harmonic problems have also seriously polluted the power grid. A large nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 戴珂彭华良康勇庄宏
Owner 博格华纳新能源(襄阳)有限公司
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