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Application of power combination technology based on phase shift pulse-width modulation (PMW) control policy in photovoltaic grid-connected system

A technology of control strategy and power combination, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of expensive photovoltaic system

Inactive Publication Date: 2011-08-10
南京冠亚电源设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the price of photovoltaic system is still relatively expensive. How to reduce its cost and provide poor areas with high-quality and low-cost outdoor grid-connected photovoltaic power generation systems under the premise of ensuring performance is an important task for scientific and technological workers in enterprises and colleges. topic

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  • Application of power combination technology based on phase shift pulse-width modulation (PMW) control policy in photovoltaic grid-connected system
  • Application of power combination technology based on phase shift pulse-width modulation (PMW) control policy in photovoltaic grid-connected system
  • Application of power combination technology based on phase shift pulse-width modulation (PMW) control policy in photovoltaic grid-connected system

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0015] The invention adopts the power combination mode based on the phase-shifting PWM control strategy, and combines multiple power devices in parallel. The number of combinations can be automatically identified through the field bus (CAN) system, and multiple single-phase parallel connections can also be made by setting Three-phase system, at the same time, the system automatically seeks the master, and the master control machine uses CAN bus to realize data sharing. If there is a machine failure, the machine will automatically exit the parallel system to realize the parallel redundancy of the system. The purpose of improving the efficiency of the whole machine is achieved by using the phase-shifted full bridge.

[0016] The flow chart of the system's automatic master search, such as figure 1 :

[0017] First: Power on the system. Since each mac...

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Abstract

The invention relates to a power combination mode based on a phase shift pulse-width modulation (PMW) control policy. In the mode, a plurality of power devices are combined in parallel, the number of combinations can be automatically identified through a controller area network (CAN) system, and a plurality of single phases can be connected in parallel to form a three-phase system through setting; meanwhile, the system automatically searches for a main control machine, and the acquired main control machine realizes data sharing by means of the CAN bus; and if a certain machine breaks down, the machine automatically quits the parallel system to realize parallel redundancy of the system. A phase- shifted full bridge is utilized to achieve the purpose of improving the efficiency of the wholemachine. By using the modularized structure, the fault redundancy capacity of the system is improved, safe and reliable operation of a photovoltaic grid-connected generation system can be ensured, and particularly, power values can be combined randomly, thus meeting the power requirement of high-capacity grid-connected generation. In addition, the standardization and modularization of the system can effectively reduce the cost of a grid-connected inverted power supply.

Description

1. Technical field [0001] The invention belongs to a photovoltaic grid-connected system, and specifically relates to the application of a power combination technology based on a phase-shifting PWM control strategy in a photovoltaic grid-connected system. 2. Background technology [0002] The application and demand of outdoor grid-connected photovoltaic power generation is becoming more and more extensive. For example, projects such as "rural biogas system" and "photovoltaic pest early warning or pest control system" in the "Siyuan Project" proposed by the state recently require the use of grid-connected photovoltaic power generation system. At present, the price of photovoltaic system is still relatively expensive. How to reduce its cost and provide poor areas with high-quality and low-cost outdoor grid-connected photovoltaic power generation systems under the premise of ensuring performance is an important task for scientific and technological workers in enterprises and coll...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/42
Inventor 孙邦伍张海波
Owner 南京冠亚电源设备有限公司
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