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Grid-connected output power control method of photovoltaic power generation

A technology of output power and control method, which is applied in the field of grid-connected output power control of photovoltaic power generation, can solve problems such as grid-connected inverters cannot be stably connected to the grid, and solar panels cannot be tracked, so as to improve safety and stability sexual effect

Inactive Publication Date: 2018-12-21
青海伟航北创新能源科技有限公司
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Problems solved by technology

Otherwise, the MPPT method will not only fail to track the maximum power point of the solar panel, but will also make the grid-connected inverter unable to run stably, and even cause off-grid failures.

Method used

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  • Grid-connected output power control method of photovoltaic power generation
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  • Grid-connected output power control method of photovoltaic power generation

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Embodiment Construction

[0026] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

[0027] Such as figure 1 As shown, the P-V characteristic curve of a solar panel applied to photovoltaic power generation is a single-peak curve. At the actual maximum power output point voltage U MPP where the maximum output power is obtained.

[0028] figure 2 A practical system for realizing the photovoltaic power generation grid-connected output power control method proposed in the present invention is given, including a constant voltage control module, an MPPT control module, a switching control unit, a bus voltage dynamic adjustment unit, an active current soft start unit, and a SVPWM unit.

[0029] exis...

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Abstract

The invention discloses a photovoltaic power generation grid-connected output power control method, comprising the following steps: S1, firstly, a constant voltage control mode is adopted to control the output voltage, and when the output voltage reaches the theoretical maximum power point voltage, the output voltage is switched to the MPPT mode; S2, adjusting the voltage of the DC bus bar, and determining that the voltage command value of the voltage loop bus bar is greater than the maximum peak value of the voltage fundamental wave in the power line; 3, determining an active power current command value accord to the voltage command value of the voltage loop bus bar and the actual value of the bus bar voltage; S4, limiting the time of current increment, and realizing the soft start of active current; S5: obtaining The SVPWM according to the active and reactive power current commands, and realzing the switching control of the power device of the grid-connected inverter. The remarkableeffect is that the system tracks to the actual maximum power point quickly and accurately and works stably, and the influence of voltage fluctuation on the system stability is well solved. It also solves the defects caused by using MPPT control method, and improves the security and stability of the system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method for controlling the grid-connected output power of photovoltaic power generation. Background technique [0002] Photovoltaic power generation is the main form of utilization of solar energy. Independent photovoltaic power generation systems can effectively solve the problem of power supply in remote areas without electricity and in some special occasions. The output of solar panels is highly nonlinear, and the output power varies greatly under different light conditions, temperatures, external loads, and operating voltages. Certain measures need to be taken to track the maximum power point of photovoltaic cells. [0003] Under certain environmental conditions such as light intensity and temperature, the P-V characteristic curve of the solar panel of the photovoltaic cell is as follows: figure 1 As shown, it is a single-peak curve, which shows that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/385H02J3/48H02J2203/20Y02E10/56
Inventor 袁锦华
Owner 青海伟航北创新能源科技有限公司
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