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Active power control method for a two-stage photovoltaic power generation system

A photovoltaic power generation system and active power technology, applied in photovoltaic power generation, control/regulation systems, electrical components, etc., can solve problems such as active power fluctuations of photovoltaic grid-connected inverters, and achieve smooth scheduling, precise control, and stable switching. Effect

Active Publication Date: 2019-03-05
XUJI GRP +3
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Problems solved by technology

[0003] The invention provides an active power control method of a two-stage photovoltaic power generation system to solve the problem of fluctuations in active power output by photovoltaic grid-connected inverters when the illumination changes in the two-stage photovoltaic power generation system

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  • Active power control method for a two-stage photovoltaic power generation system

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Embodiment Construction

[0013] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] The front stage of the photovoltaic grid-connected inverter of the two-stage photovoltaic power generation system adopts a boost circuit MPPT voltage outer loop and the rear stage adopts a three-level circuit DQ axis decoupling current inner loop control, and the front stage boost circuit uses MPPT during normal MPPT operation Track and control the input voltage of the battery panel, and the subsequent NPC circuit (three-level circuit) completes the inversion to ensure that the photovoltaic grid-connected inverter outputs the current maximum power of the battery panel. When the inverter receives the power scheduling command issued by the background, The inverter starts to run with limited power. The active power control is realized through the subsequent circuit, and the system samples the three-phase AC phase voltage U in rea...

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Abstract

The invention relates to an active power control method of a two-stage photovoltaic power generation system. A front stage of an inverter adopts a boost circuit maximum power point tracking (MPPT) voltage outer ring to control, and a rear stage adopts a three-level circuit DQ-axis decoupled current inner ring to control. The method comprises the following control steps of 1) comparing output power P<_MPPT> of the inverter and a power value P<_set> set by dispatching; 2) allowing the front-stage boost circuit of the inverter to work in an MPPT mode and the rear-stage three-level circuit to work in a voltage and current dual-ring voltage-stabilization mode if the P<_MPPT> is smaller than the P<_set>; and 3) allowing the inverter to work an active power dispatching mode when the P<-MPPT> is greater than the P<_set>, namely which the front-stage boost circuit of the inverter is used for charging a DC bus of the rear-stage three-level circuit, and the rear-stage three-level circuit works in a current single-ring mode according to the power value P<_set> set by dispatching. By the method, accurate control on active power can be achieved, the dispatching process is stable, and no current impact is generated.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to an active power control method of a two-stage photovoltaic power generation system. Background technique [0002] With the increasing pressure on the global resources and environment, energy conservation and emission reduction and resource conservation have become the trend of world economic development. Focusing on the development of green economy and strengthening energy conservation and emission reduction, we will accelerate the construction of a resource-saving and environment-friendly society. As a widely used energy source, electric energy has penetrated into all aspects of industrial production, society and people's life. my country's power grid has low load rate, frequent changes in power factor, and insufficient reactive power compensation capacity. With the continuous development of the photovoltaic industry, the application of string ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G05F1/67
CPCG05F1/67H02J3/383Y02E10/56
Inventor 芦开平梁燕李建伟郭寅远汪海涛
Owner XUJI GRP
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