Single-stage booster inverter non-isolated grid-connected photovoltaic power generation system and control method thereof

A technology for isolating photovoltaic grid-connected power generation and control method, applied in the field of electric power, can solve problems such as increasing system cost, reducing conversion efficiency and reliability, and achieving the effect of eliminating common-mode voltage and reducing common-mode voltage amplitude

Active Publication Date: 2014-05-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solution of inserting a one-stage DC / DC boost converter before the voltage-type inverter increases the cost of the system, reduces the conversion efficiency and reliability, and the shortcomings of the voltage-type inverter itself have not been overcome

Method used

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  • Single-stage booster inverter non-isolated grid-connected photovoltaic power generation system and control method thereof
  • Single-stage booster inverter non-isolated grid-connected photovoltaic power generation system and control method thereof
  • Single-stage booster inverter non-isolated grid-connected photovoltaic power generation system and control method thereof

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specific example

[0047] A specific example of the present invention is as follows:

[0048] Photovoltaic battery output voltage Upv=150V, busbar voltage amplitude Ub=400V, grid voltage / frequency: 110V / 50Hz, distributed capacitance Cpv=100nF, photovoltaic panel ground impedance Rpv=10Ω, filter inductance Lg=20mH, coupling inductance: L1=215μH, N=2.5, k=0.98, capacitor C1=10μF, C2=70μF, inductance L3=25μH, switching frequency fs=10KHz.

[0049] When the single-stage boostable inverter in the prior art adopts SVPWM and is plugged in through, the ripple of the three-phase grid-connected current is large due to the large leakage current. The common mode voltage changes 8 times in one switching cycle, and has 4 different level values. When the grid-connected power is 500W, the leakage current amplitude is 0.9A, and the effective value is about 0.64A, which is much larger than the VDE0126-1-1 standard.

[0050] However, in the case of using three adjacent effective vectors to synthesize pulse width...

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Abstract

The invention discloses a single-stage booster inverter non-isolated grid-connected photovoltaic power generation system. A coupled inductor passive network is introduced to couple the main circuit of the inverter with a power source, the booster function is realized through primary transformation, and at the same time, a fourth diode is added, the electrical connection between the effective vector and the photovoltaic cell end and the power grid side in the traditional zero vector state can be disconnected, so the common mode voltage generation current circuit in the state can be blocked. The invention further discloses a single-stage booster inverter non-isolated grid-connected photovoltaic power generation system control method, in the control method, the adjacent effective vector synthesis pulse width modulation and direct connection control mode is adopted, and the traditional zero vector does not adopted, so the common mode voltage when the traditional zero vector is switched to other states can be eliminated, and the common mode voltage amplitude of the effective vector can be reduced.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a single-stage boost inverter non-isolated photovoltaic grid-connected power generation system and a control method thereof. Background technique [0002] Converters used in new energy power generation applications usually use isolation transformers, including power frequency transformers on the grid side or high-frequency transformers in the front stage of the converter, to match input and output voltages and isolate photovoltaic modules from the grid. However, the power frequency transformer increases the volume, weight and cost of the system and reduces the conversion efficiency; while the high frequency transformer greatly reduces the volume, weight and cost compared with the former, but increases the complexity of power conversion. [0003] The non-isolated photovoltaic grid-connected power generation system does not contain an isolation transformer, which has the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5395
CPCY02E10/56
Inventor 周玉斐黄文新赵萍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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