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Photovoltaic grid-connected inverter low voltage ride through (LVRT) control method

A low-voltage ride-through and control method technology, applied in photovoltaic power generation, electrical components, single-grid parallel feeding arrangement, etc., can solve problems such as deteriorating power grid operation status, and achieve the effect of ensuring reactive power support capacity

Active Publication Date: 2014-12-10
四川科陆新能电气有限公司
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Problems solved by technology

[0002] At present, photovoltaic power generation has become an important form of solar resource development and utilization, among which the access of large-scale photovoltaic power plants will have a profound impact on the safe and stable operation of the power grid, especially when the power grid fails, the sudden disconnection of photovoltaic power plants will further deteriorate the operation of the power grid state, with more serious consequences

Method used

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  • Photovoltaic grid-connected inverter low voltage ride through (LVRT) control method
  • Photovoltaic grid-connected inverter low voltage ride through (LVRT) control method
  • Photovoltaic grid-connected inverter low voltage ride through (LVRT) control method

Examples

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Embodiment

[0087] Examples include:

[0088] Collect inverter DC side voltage U dc and current I dc A step of;

[0089] The DC side voltage U dc and current I dc Perform maximum power point tracking algorithm MPPT processing to obtain the voltage U corresponding to the maximum power point of the inverter dc_ref A step of;

[0090] Calculate U dc_ref and DC side voltage U dc difference step;

[0091] The step of performing PI adjustment on the difference to obtain a PI adjustment value of the voltage loop, the PI adjustment being proportional-integral adjustment. The power generated by the feedforward synthesis is equal to the DC side voltage multiplied by the DC side current.

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Abstract

The invention discloses a photovoltaic grid-connected inverter low voltage ride through (LVRT) control method, and relates to the field of grid-connected photovoltaic power generation. The method is characterized by comprising a distribution procedure of active power and reactive power in the LVRT process, and procedures about elimination of current peak and protection to an inverter. The procedure of protection to the inverter includes that when a grid is in a grid voltage drop stage or in a grid voltage recovery stage, if an average current value of any phase of three-phase current outputted by the inverter is detected to exceed an average threshold value, a pulse-width modulation (PWM) control signal of the inverter is switched off, and the PWM control signal of the inverter can be recovered after duration of half PWM control signal cycle time; and if an instantaneous value of any phase of the three-phase current of an output end of the inverter is detected to exceed an instantaneous threshold value, the connection between the inverter and the grid can be switched off. The instantaneous threshold value is higher than the average threshold value and the like.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected power generation, in particular to a control method for low-voltage ride-through of a photovoltaic grid-connected inverter. Background technique [0002] At present, photovoltaic power generation has become an important form of solar resource development and utilization, among which the access of large-scale photovoltaic power plants will have a profound impact on the safe and stable operation of the power grid, especially when the power grid fails, the sudden disconnection of photovoltaic power plants will further deteriorate the operation of the power grid state, with more serious consequences. Therefore, it is urgent to carry out research on the low-voltage ride-through technology of large-scale photovoltaic grid-connected inverters to ensure the safe and stable operation of the power grid after the photovoltaic power station is connected. [0003] China's "Technical Regulations for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/18H02H7/122
CPCY02E10/563Y02E40/30Y02E10/56
Inventor 陈欢杨西全吴波
Owner 四川科陆新能电气有限公司
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