Self-regulation tracking method for tracking maximum power point of photovoltaic inverter

A maximum power point, photovoltaic inverter technology, applied in output power conversion devices, photovoltaic power generation, conversion of AC power input to DC power output, etc., can solve the problem of difficult to improve tracking accuracy and dynamic response, complex calculation and judgment process , It is difficult to take into account the problems of fast and slow light change tracking performance, to achieve the effect of improving static accuracy and dynamic response, improving tracking performance, and avoiding adverse results

Inactive Publication Date: 2013-01-30
上海伊阿宋文化科技有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

They are characterized by the need for more complex calculation and judgment process, and it is difficult to take into account

Method used

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  • Self-regulation tracking method for tracking maximum power point of photovoltaic inverter
  • Self-regulation tracking method for tracking maximum power point of photovoltaic inverter
  • Self-regulation tracking method for tracking maximum power point of photovoltaic inverter

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Embodiment Construction

[0016] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0017] According to attached figure 1 The basic properties of the P-I characteristics shown are monotonic, unique and polar, and the general function form of the given control law for constructing the inverter current adjustment given control law is as follows

[0018] dI o = f ( dP dI ) - - - ( 1 )

[0019] The regulation law control function takes the simple proportional function

[0020] f ( dp di ) = λ · ...

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Abstract

The invention discloses a self-regulation tracking method used for a tracking maximum power point of a photovoltaic inverter. The self-regulation tracking method is characterized in that a P-I variable rate dP/dI is utilized as a regulated variable to construct an inversion current regulation setting control law general expression, the inversion current regulation setting control law adopts a function concrete form variance time domain expression that Io[k]=Io[k-1]+delta Io[k], wherein k is the ordinal number of an alternating current sine wave period or the ordinal number of a pulse width modulation period, and Io is a set current; and delta P is output power differentiation or variation of a photovoltaic cell or an assembly bunch of discrete time, delta I is output power differentiation or variation of the photovoltaic cell or an assembly bunch of discrete time, and lambda k is a strength factor of a variable rate feedback action. The self-regulation tracking method provided by the invention can be used for tracking the maximum power point of the high performance photovoltaic inverter which performs adjustment according to a completely natural law, and the tracking property of the maximum power point is further improved because of a P-I variable rate asymmetry characteristic.

Description

technical field [0001] The invention relates to the technical field of renewable energy photovoltaic power generation systems, in particular to a self-regulating tracking method for maximum power point tracking of photovoltaic inverters suitable for grid-connected and off-grid photovoltaic inverters. Background technique [0002] Among the various performances of photovoltaic grid-connected inverters, the static and dynamic accuracy of the maximum power point tracking (MPPT) is an important technical index to measure the work of the inverter, which largely determines the performance of the photovoltaic power delivered by the inverter under the same conditions. Daily or annual power generation. Common methods for maximum power point tracking of photovoltaic power generation include constant voltage tracking (CVT), perturbation and observation (P&O) and conductance increment (IC), etc., as well as derivatives of these methods or combinations with other methods. The most commo...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02N6/00
CPCY02E10/56
Inventor 章伟康章闻曦褚君浩
Owner 上海伊阿宋文化科技有限公司
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