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Converter current inner ring optimal gain determination method

A current inner loop and determination method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems that the voltage source output converter cannot meet the accuracy and reliability , to achieve the effect of improving the system damping characteristics, increasing the system stability margin, suppressing resonance and its peak value

Inactive Publication Date: 2018-08-03
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to meet the temperature rise and heat dissipation requirements of high-power converters, the general switching frequency is limited to about 3kHz ~ 4kHz, so the analysis and design of voltage source output converters in the continuous domain cannot meet the requirements of accuracy and reliability.

Method used

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  • Converter current inner ring optimal gain determination method
  • Converter current inner ring optimal gain determination method
  • Converter current inner ring optimal gain determination method

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Embodiment 1

[0053] The topology of the main circuit of the voltage source output converter is as follows: figure 2 As shown, the DC side is different due to different applications. For the two-stage PCS, the DC side is provided by DC / DC and the energy storage medium. For photovoltaic power generation, the DC side is obtained by boosting the previous stage Boost. , for the shore power supply, the DC side is obtained by rectifying the grid diode or PWM. For high-power converters, the output is generally connected to an LC filter, where R L It is the loss equivalent resistance of the reactor and power switching device. The output terminal of the LC filter can be directly connected to the load. For occasions that require isolation (such as shore power supply, etc.), the output terminal of the LC filter needs to be connected to the load through an isolation transformer. , At this time, the primary side of the transformer adopts the delta connection method, and the secondary side adopts the s...

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Abstract

The present invention discloses a converter current inner ring optimal gain determination method. The method comprises the steps of: establishing a mathematical model of a controlled object in a discrete domain; defining a minimal function of distances from closed-loop poles to a unit circle, scanning controller gains, obtaining the position of one closed-loop pole corresponding to each controllergain, and obtaining a relation curve of the minimum distance from the closed-loop poles to the unit circle; and finally, on the premise of the a stable system, calculating the maximum value of the relation curve from the closed-loop poles to the unit circle, wherein the controller gain corresponding to the maximum value is a current loop optimal gain. A simple and visual determination method is provided for the current inner ring gain of the double closed loop control to optimize the system damping, inhibit the resonance of an output LC filter and provide theoretical basis for voltage outer ring parameter design on the premise of achieving the optimal gain.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a method for determining the optimal gain of a current inner loop of a converter. Background technique [0002] Converters can provide reliable power supply for local loads. Typical applications include power storage converters (PCS), uninterruptible power supplies (UPS), independent distributed power generation, microgrids, and shore power supplies. In these occasions, the converter is required to provide the load with a high-quality power supply voltage with constant frequency and amplitude, three-phase balance, and low THD, while the output current is determined by the load. Since there are various types of loads, such as three-phase balanced loads, three-phase unbalanced loads, single-phase loads, and rectified nonlinear loads, etc., the waveform and frequency spectrum of the current are very complicated. No matter what kind of load is connected, the converter is r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395
CPCH02M7/5387H02M7/5395H02M1/0012H02M1/0038
Inventor 赵志宏刘钊季振东
Owner NANJING UNIV OF SCI & TECH
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