Current reversible circuit control method for broadening output voltage range

A technology for outputting voltage and current, applied to output power conversion devices, converting DC power input to DC power output, and converting AC power input to DC power output, etc., which can solve problems such as errors

Inactive Publication Date: 2015-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the current reversible circuit is only considered for its buck and boost functions, but the energy storage battery cannot be an ideal power supply in the actual operation process, and the internal resistance of the battery (R i , R out ) is a factor that cannot be ignored, and its output voltage is only related to the duty cycle d without considering the internal resistance of the battery
Therefore, there is a large error in the method of controlling the current reversible circuit only by adjusting the duty cycle d without considering the internal resistance of the energy storage battery

Method used

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  • Current reversible circuit control method for broadening output voltage range
  • Current reversible circuit control method for broadening output voltage range
  • Current reversible circuit control method for broadening output voltage range

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Embodiment Construction

[0032] The present invention proposes a current reversible circuit control method for widening the output voltage range, which is characterized in that the current reversible circuit obtains the output voltage U by setting the limit value of the duty cycle d in the control loop under the premise that the internal resistance of the battery is fixed. o the maximum value, broaden the output voltage U o range to achieve an output voltage of U o The adjustment range is the largest. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] figure 1 Shown is the schematic diagram of the current reversible circuit working in the step-down (Buck) state. When the circuit works in the step-down (Buck) state, the IGBT T 2 Keep off, IGBT T 1 work, power flows forward, the voltage source U i To emit power, the voltage source U out absorb power. According to energy conservation, we can get:

[0034] u i I...

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Abstract

The invention discloses a current reversible circuit control method for broadening the output voltage range and belongs to the technical field of electric power converter. On the premise of fixed internal resistance of a cell of a current reversible circuit, the maximum value of output voltage Uo is obtained by setting the amplitude limiting value of the duty ratio d of a control loop, the rang of output voltage Uo is broadened, and the maximum of adjustment range of output voltage Uo is realized. The current reversible circuit control method is widely applied to the energy storage cell charge-discharge field and especially applied to the new energy power generation field, such as wind electricity and photovoltaic power generation, and the electromobile field, and plays an important role in realization of interaction of the cell and a power grid.

Description

technical field [0001] The invention belongs to the technical field of power conversion, and in particular relates to a current reversible circuit control method for widening the output voltage range. Background technique [0002] Current reversible circuits are widely used in the field of charging and discharging of energy storage batteries, especially in the fields of new energy generation such as wind power and photovoltaic power generation, as well as in the field of electric vehicles, and play an important role in realizing the interaction between batteries and power grids. The current reversible circuit is a combination of a buck circuit (Buck) and a boost circuit (Boost), and realizes bidirectional flow of power by controlling the on and off of switching devices. In the prior art, the current reversible circuit is only considered for its buck and boost functions, but the energy storage battery cannot be an ideal power supply in the actual operation process, and the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537
CPCH02M3/1563Y02E10/56
Inventor 袁敞刘昌徐永海李善颖吴涛贺惠民丛诗学
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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