An isos inverter system and its input voltage equalization output same phase control method

A technology of inverter and full-bridge inverter, which is applied in the direction of converting irreversible DC power input into AC power output, so as to achieve the effect of simplifying the loop design

Inactive Publication Date: 2011-12-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The invention proposes an ISOS inverter system and its input voltage equalization output same-phase control method for high-voltage DC input and AC output occasions to solve the problem of equalization of input and output voltages

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  • An isos inverter system and its input voltage equalization output same phase control method
  • An isos inverter system and its input voltage equalization output same phase control method
  • An isos inverter system and its input voltage equalization output same phase control method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] Here, the control principle of the present invention to realize the equalization of the input and output voltages of the ISOS inverter system is firstly analyzed.

[0023] Since the output power of the inverter includes both active power and reactive power, the above control goal is to achieve output voltage equalization by controlling the balance of output active power and reactive power while realizing input voltage equalization.

[0024] The schematic diagram of the ISOS inverter system involved in the present invention is as figure 2 As shown, assuming that the conversion efficiency of each inverter module is 100%, then the input power of each inverter module is equal to its output active power, namely:

[0025] P in 1 ...

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Abstract

The invention discloses an ISOS inverter system and its input voltage equalization output same-phase control method, belonging to the field of DC-AC converters. The inverter system includes a power circuit and n inverter modules. Each inverter module adopts a two-stage structure with high-frequency isolation. The front stage is a full-bridge DC converter, and the rear stage is a full-bridge inverter. ; The control loop of the inverter system mainly includes the shared output voltage loop and the input voltage equalizing loop and current inner loop of each inverter module. The three loops work together to achieve the phase consistency of the output voltage of each module, and combine The function of input voltage equalization realizes output voltage equalization. The invention realizes the input voltage equalization and output voltage equalization of the inverter system, and realizes the decoupling of the input voltage equalization loop and the output voltage loop, thereby effectively simplifying the loop design of the system.

Description

technical field [0001] The invention relates to an inverter system, in particular to an input-series-output-series (ISOS) inverter system and a method for controlling input voltage equalization and output same phase, and belongs to the field of DC-AC converters of electric energy conversion devices. Background technique [0002] In recent years, with the in-depth research on power electronics technology, people have higher and higher requirements for power conversion devices, especially in many applications with high DC input voltage, it is difficult to select devices in the subsequent stage converter. For example, in urban rail transit vehicles, their current collectors receive DC power from the overhead catenary or the third rail. The power supply grid has two systems: 750V DC and 1500V DC. The former allows a voltage variation range of 500-900V, and the latter The allowable voltage variation range is 1000~1800V. Another example is that my country's railway passenger trai...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49
Inventor 方天治阮新波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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