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Control method of modular full-bridge grid-connected inverters capable of parallel operation

A control method and inverter technology, which are applied in the direction of single-network parallel feed arrangement, output power conversion device, AC power input conversion to DC power output, etc., can solve problems such as switch tube damage, and achieve volume reduction and Weight, ease of expansion and maintenance, and cost-saving effects

Inactive Publication Date: 2010-06-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The existing full-bridge inverter grid-connected control method only performs closed-loop control on the single inductor current, so the uncontrolled inductor current will have a coupling relationship with the uncontrolled inductor current in other full-bridge inverters, and the inductor current Contains a large DC component, which will cause damage to the switch tube

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  • Control method of modular full-bridge grid-connected inverters capable of parallel operation
  • Control method of modular full-bridge grid-connected inverters capable of parallel operation
  • Control method of modular full-bridge grid-connected inverters capable of parallel operation

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Embodiment Construction

[0017] The modularized full-bridge grid-connected inverter and its control circuit that can work in parallel in the present invention are as follows: figure 1 As shown, including the power supply circuit power supply 1, the full bridge inverter circuit 2, the first filter inductor L f1 , the second filter inductance L f2 , filter capacitor C f , AC power grid, control circuit 3, modulation circuit 4, the control circuit 3 includes a multiplier, an adder, two subtractors and two current regulators, the modulation circuit 4 includes two comparators, three inverters Inverter and four switch tube drive circuits.

[0018] The control method of the present invention is: grid-connected current given signal i g The grid-connected current reference signal i is obtained after the phase-locked signal PLL with the grid voltage passes through the multiplier ref , using the current sensor to sample the first filter inductor current i in the inverter Lf1 and the second filter inductor c...

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Abstract

The invention discloses a control method of modular fully-bridge grid-connected inverters capable of parallel operation, belonging to the control field of inverters. A control circuit of the method comprises a control part and a modulation part. The closed-loop regulation is respectively carried out on currents of two output filtering inductors behind the full-bridge grid-connected inverters, fundamental wave components of currents of a live wire and a zero wire which are connected in parallel at the output side of each inverter are equal to ensure that no current coupling relationship exists among the inverters, thereby enabling the full-bridge grid-connected inverters to work in parallel by sharing a direct current bus. The full-bridge grid-connected inverters controlled by the invention is easy to modularize, omits a power frequency isolation transformer at the output end of each inverter, reduces the volume and the weight of an integral machine, saves the system cost, and is especially suitable for application of a photovoltaic grid-connected generating system.

Description

technical field [0001] The invention relates to a control method of an inverter, in particular to a control method of a modularized full-bridge grid-connected inverter capable of working in parallel, and belongs to the field of inverter control. Background technique [0002] With the shortage of traditional fuel energy, renewable energy sources such as solar energy and wind energy have gradually received extensive attention and research because of their environmental protection and many advantages such as no energy consumption. [0003] At present, in the relatively high-power photovoltaic power generation system, the distributed parallel connection is mainly realized at the DC / DC converter, that is, one photovoltaic array is connected to one DC / DC converter respectively to realize maximum power tracking and avoid centralized photovoltaic arrays. The resulting interaction improves the efficiency of MPPT. After the output of the DC / DC converter is connected in parallel, a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCY02E10/563Y02E10/56
Inventor 张犁冯兰兰邢岩孙凯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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