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Inverter parallel phase synchronization control method for power weighing

A control method and phase synchronization technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as inverter circuit out of control, improve priority, ensure high-precision phase-locked synchronization, and improve instability problem effect

Inactive Publication Date: 2009-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

In this way, since each sine wave tracks the one with the highest crystal frequency, when the one with the highest crystal frequency malfunctions, it may cause the entire inverter circuit to lose control.

Method used

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  • Inverter parallel phase synchronization control method for power weighing
  • Inverter parallel phase synchronization control method for power weighing
  • Inverter parallel phase synchronization control method for power weighing

Examples

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specific Embodiment

[0025] One of the specific embodiments: a 10kW inverter module and three 5kW inverter modules are connected in parallel

[0026] There are 4 parallel inverter modules in this embodiment, according to P 1 Q 1 = P 2 Q 2 = P 3 Q 3 = . . . = P n Q n , Let’s define that the weight of each 5kW module is 1, then the weight of the 10kW module is 2, and the sum of the weights of all modules interrupting the synchronization signal is 5, which is not an even number, then the false module signal AUX is set to high level, and the synchroniz...

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Abstract

The invention discloses an inverter parallel phase synchronization control method for power weighing, and belongs to the technical field of inverter parallel control. The method comprises the following steps: when standard sine wave of each inverter module passes zero, sending a negative pulse interruption synchronizing signal to an interconnection line respectively, carrying out weighing operation on the interruption synchronizing signal of each module by using power as a weight standard, adding a false module circuit into an interruption synchronizing circuit if the weight sum of all interruption synchronizing signals is even and the power sum of some modules is just half of the total power, and acquiring a common interruption signal when the weight sum of the interruption synchronizing signals in a low level is greater or equal to half of the weight sum of all interruption synchronizing signals. A system transmits the common interruption signal to each module through the interconnection line; and after receiving the common interruption signal, any module is enforced to send the standard sine wave from zero. The synchronization control function can be realized by a singlechip. The control method ensures high-precision phase locking synchronization of a standard voltage, and improves the reliability of the system.

Description

technical field [0001] The invention relates to a power-weighted inverter parallel phase synchronous control method, which belongs to the technical field of inverter parallel control. Background technique [0002] With the rapid development of information processing technology, the performance requirements of power supply system are getting higher and higher, which promotes the continuous deepening of power electronics technology research. The parallel connection of multi-module power supplies can easily realize large-capacity power supply, and the parallel operation of inverter modules with different output powers can greatly improve the flexibility and redundancy of the system. The output of the inverter power supply is an alternating sine wave. When connecting in parallel, it is necessary to control the amplitude, frequency and phase angle of the sine wave at the same time, that is, the same frequency, the same phase, and the same amplitude. Parallel module synchronizati...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 马运东王爽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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