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A polarity inversion output inverter with power decoupling and its control method

A technology of polarity reversal and power decoupling, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc. It can solve the problems of unstable filtering performance, large size, and low reliability.

Active Publication Date: 2019-09-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

All in all, these methods of filtering secondary current ripple through passive devices have problems such as large size, low reliability, and unstable filtering performance.

Method used

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  • A polarity inversion output inverter with power decoupling and its control method
  • A polarity inversion output inverter with power decoupling and its control method
  • A polarity inversion output inverter with power decoupling and its control method

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0028] attached figure 1 What is shown is a structural schematic diagram of a main circuit of a polarity inversion output type inverter with power decoupling and its control method. The main circuit of the polarity inversion output inverter with power decoupling consists of a DC power supply, an input capacitor 1, an isolation transformer 2, a primary switch tube 3, a cut-off diode 4, a filter capacitor 5, and a polarity inversion inverter bridge 6 , filter circuit 7, grid 8 and decoupling circuit 9. C in is the input capacitance, S p is the primary switch tube, S x1 ~S x3 is the decoupling switch tube, L x is the decoupling inductance, D x1 、D x2 is the decoupling diode, C x is the decoupling capacitor, T is the isolation transformer, D 1 is the cut-off diode, C o is the filter capacitor, S t1 , S t2 is the thyristor, S s1 , S s2 is the switching t...

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Abstract

The invention discloses a polarity reversal output-type inverter with power decoupling and a control method thereof. The main circuit topology of the inverter comprises a DC power supply, an input capacitor, a primary-side switch transistor, an isolation transformer, a cut-off diode, a filter capacitor, a polarity reversal inverter bridge, an output filter circuit, a power grid and a decoupling circuit. The control method comprises steps: a unit sinusoidal wave is acquired through a PLL from a power grid voltage sampling value, the maximum DC input power is acquired through an MPPT from inputvoltage and current sampling values, a voltage disturbance signal is acquired through a voltage loop from a decoupling capacitor voltage sampling value, five modulation wave signals are obtained through a current reference operation circuit and a modulation signal generating circuit, and finally, through a PWM control circuit and a logic circuit, a grid-connected inverter is controlled to work. Adecoupling circuit formed by a decoupling switch transistor, a decoupling diode and a decoupling capacitor is added to the primary side of the isolation transformer, secondary current ripples at the DC power supply input side are effectively eliminated, and grid connection is realized.

Description

technical field [0001] The invention relates to a polarity inversion output type inverter with power decoupling and its control method, which belongs to the miniature and grid-connected inverter, which uses an added decoupling circuit to eliminate the secondary current ripple on the DC input side . Background technique [0002] In recent years, energy shortage and environmental pollution have attracted widespread attention. New energy sources such as photovoltaics and fuel cells have developed rapidly due to their clean, efficient, and sustainable advantages, such as new energy power generation systems. For this kind of new energy power generation system, the output power of the grid-connected inverter contains a power ripple that is twice the frequency of the grid voltage. As far as components are concerned, it will affect their maximum power point tracking and reduce system efficiency. Therefore, it is of great significance to solve the secondary current ripple problem in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/14H02J3/38
Inventor 陈仲袁涛章修齐许亚明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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