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A new unified power quality adjustment device with integrated photovoltaics and its control method

A technology of power quality adjustment and integrated photovoltaics, which is applied in photovoltaic power generation, harmonic reduction devices, and AC network voltage adjustments. It can solve the problems of long-term power supply and low utilization rate, so as to reduce demand, improve utilization rate, and reduce burden. Effect

Active Publication Date: 2021-01-08
北京新兴合众科技有限公司
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Problems solved by technology

[0005] Aiming at the problems existing in the prior art to improve the low utilization rate of traditional UPQC series converters and the inability to supply power for a long time when the voltage is interrupted, the present invention provides a new unified power quality adjustment device with integrated photovoltaics and its control method

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  • A new unified power quality adjustment device with integrated photovoltaics and its control method
  • A new unified power quality adjustment device with integrated photovoltaics and its control method
  • A new unified power quality adjustment device with integrated photovoltaics and its control method

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with accompanying drawing:

[0058] A new unified power quality adjustment device integrated with photovoltaics, its structure schematic diagram is as follows figure 1 As shown, the device components include:

[0059] Series transformer, the primary side is connected in series between the grid and the load, and the secondary side is connected to the series converter, which functions as a series connection between the grid and the series converter and isolation of the series and parallel converters

[0060] The series converter is connected to the side of the power grid away from the load through the series transformer, and the DC bus is connected in parallel with it; it operates as a sinusoidal current source and can provide active power and reactive power for the load. By controlling the series converter, it can control the main power supply channel Current value function and stable DC bus voltage; ...

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Abstract

The invention provides a novel integrated photovoltaic unified power quality adjustment device and a control method thereof. The device comprises a series transformer, a series converter, a parallel converter, a direct current bus capacitor, a boost converter and a photovoltaic array. When the power grid voltage is reduced, a complex power control method is enabled. The series converter can provide active and reactive power for a load. When the power grid voltage is normal and the power grid voltage increases, the series converter works in a rectification state. The parallel converter works inan inversion state. The direct current bus capacitor is in a charging state. When the power grid voltage drops, the series converter works in the rectification state and the inversion state with thedeepening of the voltage drop degree of a power grid. The direct current bus capacitor is in a charging state and a discharging state with the deepening of the drop degree. The parallel converter works in the inversion state and the rectification state with the deepening of the voltage drop degree of the power grid. When the power grid voltage is interrupted, the photovoltaic array is connected with a direct current bus through the boost converter to provide power for the load.

Description

technical field [0001] The invention relates to the field of power quality management, in particular to a novel unified power quality adjustment device with integrated photovoltaics and a control method thereof. Background technique [0002] Today's power systems require more and more renewable energy installations, especially in low-voltage power distribution systems. This is what has led to an increase in the penetration of renewable energy systems. Although these power electronic loads have high energy efficiency, they inject harmonic currents into the grid, causing distortion at the point of common coupling (Point of Common Coupling, PCC). In addition, some power electronic loads are sensitive to voltage disturbances. In weak distribution systems, due to the intermittent nature of clean energy sources (such as wind and solar energy), PCC voltage fluctuations affect sensitive power loads, such as adjustable speed drives, lighting systems etc., which may lead to frequent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/01H02J3/38
CPCY02E10/56Y02E40/40
Inventor 曲正伟侯烁王云静王宝娜
Owner 北京新兴合众科技有限公司
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