Power transmission method and system for realizing real-time tracking internal resistance matching

A technology of real-time tracking and power transmission, which is applied in the direction of conversion of AC power input to DC power output, output power conversion equipment, and conversion equipment without intermediate conversion to AC, which can solve the problem of unstable curve and unstable convergence effect of power output , power output jitter and other issues

Active Publication Date: 2019-12-17
JINAN LICHENG POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
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  • Application Information

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Problems solved by technology

The simulation results obtained by using the open circuit voltage method and the constant voltage method will oscillate over time, and the power output will have a certain "jitter...

Method used

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  • Power transmission method and system for realizing real-time tracking internal resistance matching
  • Power transmission method and system for realizing real-time tracking internal resistance matching
  • Power transmission method and system for realizing real-time tracking internal resistance matching

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Embodiment 1

[0066] Embodiment 1 of the present invention proposes a power transmission method and system for real-time tracking of internal resistance matching. The method first models and selects a Boost circuit boost module of a two-stage three-phase grid-connected photovoltaic power generation system. attached figure 1 It is a schematic diagram of a two-stage three-phase grid-connected photovoltaic power generation system based on Embodiment 1 of the present invention; it includes a photovoltaic cell array, a Boost circuit boost module, an inverter module, and an LC filter module; the photovoltaic cell array boosts the Boost circuit The module provides DC voltage; the Boost circuit boost module is used to boost the DC power input by the photovoltaic cell array; the inverter module converts the DC voltage raised by the Boost circuit boost module into AC; the LC filter circuit is used to realize AC voltage filtering.

[0067] The Boost circuit boost module generates an error signal thro...

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Abstract

The invention provides a power transmission method and system for realizing real-time tracking internal resistance matching. The method comprises the steps: carrying out modeling and selection on a Boost circuit boosting module of a two-stage three-phase grid-connected photovoltaic power generation system, and obtaining an equivalent model and a simplified equivalent model of an inverter DC side for an inverter circuit; defining photovoltaic cell internal resistance RST, equivalent input resistance ROUT of the inverter input side and duty ratio DST of a photovoltaic inverter under a standard condition, and calculating photovoltaic cell internal resistance variation delta R1, which changes with the outside world, and duty ratio delta D, which is adjusted with the change of the delta R1; andby changing the delta D, finding real-time match with the photovoltaic cell internal resistance delta R, and realizing photovoltaic power generation maximum power tracking. On the basis of the methodprovided by the invention, the invention further provides the power transmission system for realizing real-time tracking internal resistance matching. On the premise of ensuring tracking accuracy andstability, the method and system realize simplicity and rapidity of a power transmission algorithm for realizing real-time tracking internal resistance matching.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a power transmission method and system for real-time tracking of internal resistance matching. Background technique [0002] In recent years, due to people's high attention to renewable energy, photovoltaic power generation technology has developed rapidly, but there are certain problems in photovoltaic power generation. Since solar radiation is affected by meteorological factors such as seasons and weather, photovoltaic power generation has obvious randomness and volatility. [0003] Compared with other control methods, the constant voltage tracking method, that is, CVT, is easier to operate, the control program design is simple, and there is no shock and vibration at the maximum power point, and it is relatively stable. This is better than other maximum power tracking strategies, but there are some limitations. The set voltage value determines...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M3/10H02M7/5387
CPCH02M3/10H02M7/5387Y02E10/56
Inventor 安宁贾崇胜李化波刘双喜赵博琛徐现昊王乐秋
Owner JINAN LICHENG POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO
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