A modular multi-level photovoltaic grid-connected system and its control method

A modular multi-level, control method technology, applied in photovoltaic power generation, control/regulation systems, and electrical variable adjustment, etc., can solve problems such as output efficiency drop, array power mismatch, low photovoltaic module power, etc., to reduce capacitance The effect of stress, increasing capacity and reducing the harmonic content of inverter output
CN104167760BInactive Publication Date: 2016-03-30HUNAN UNIV
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2016-03-30
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a modularization multi-level photovoltaic grid connected system and a control method thereof. A three-phase six-leg topology structure is employed each leg is formed by connecting a half-bridge module SM, N assembly modules PM and one inductor L in series. Each SM is composed of two IGBT tubes T1 and T1, two diodes D1 and D2, and one capacitor C. Each PM is formed by connecting one photovoltaic assembly PV at the two ends of the capacitor C on the basis of each SM. The control method comprises maximum power tracking control, redundancy module control, voltage stabilization control and grid connected control. According to the invention, reliable working of an inverter and maximum power tracking of the photovoltaic assemblies can be realized under the condition of local shadow, a modularization multi-level structure reduces capacitor stress and an inversion output harmonic wave content, a DC transformation circuit is unnecessary, through the control method, the maximum power tracking of each PV assembly is realized, compared to a conventional array global maximum power control method, the output power is improved, and hardware investment is reduced.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a distributed power supply, in particular to a modularized multilevel photovoltaic grid-connected system and a control method thereof. Background technique

[0002] In today's world, energy issues are becoming increasingly prominent. It has become an inevitable trend of energy development to seek new energy to replace the dwindling fossil fuels. Among all new energy power generation, solar power generation has a prominent position and obvious advantages. Solar energy is an inexhaustible source of energy with huge reserves, without mining and transportation links, solar power generation is clean and pollution-free, and does not emit waste gas, which is beneficial to environmental protection. Today, when the energy crisis is about to break out and the environment is gradually deteriorating, solar power generation technology has important research value and broad application prospects.

[0003] Photovoltaic power generation is ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More