Power transmission method and system for real-time tracking of internal resistance matching
A real-time tracking and power transmission technology, applied in the direction of conversion of AC power input to DC power output, output power conversion devices, conversion equipment without intermediate conversion to AC, etc. It can solve the problem of unstable power output convergence effect and unstable curve. , power output jitter, etc.
Active Publication Date: 2021-07-30
JINAN LICHENG POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
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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"; when the external light conditions change suddenly, the power output convergence effect of the disturbance observation method is unstable, and the curve is relatively smooth. smooth
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Embodiment 1
[0067] 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.
[0068] The Boost circuit boost module generates an error signal thro...
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The invention proposes a power transmission method and system for real-time tracking of internal resistance matching. The method models and selects the Boost circuit boost module of the two-stage three-phase grid-connected photovoltaic power generation system, and obtains the DC side of the inverter for the inverter circuit. The equivalent model and simplified equivalent model; define the internal resistance R of photovoltaic cells under standard conditions ST , The equivalent input resistance R on the input side of the inverter OUT and the duty cycle D of the photovoltaic inverter ST , calculate the variation of the internal resistance of the photovoltaic cell △R with the external changes 1 , and with △R 1 The duty ratio △D can be adjusted by changing △D; by changing △D, the real-time matching with the internal resistance △R of the photovoltaic cell can be sought, and then the maximum power tracking of photovoltaic power generation can be realized. Based on the method proposed by the invention, a real-time tracking internal resistance matching is also proposed power transmission system. On the premise of ensuring the accuracy and stability of the tracking, the present invention also realizes the simplicity and rapidity of the real-time tracking internal resistance matching power transmission algorithm.
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...
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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