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DC microgrid island detection method based on mppt trapezoidal voltage disturbance

一种直流微电网、孤岛检测的技术，应用在直流电源并联运行、直流网络电路装置、光伏系统的监测等方向，能够解决检测盲区大等问题，达到电能质量影响小、保证有效性、幅度小的效果

Active Publication Date: 2022-04-22
TIANJIN UNIV
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Problems solved by technology

In the DC microgrid, only the electrical quantity of the voltage signal can be used. Compared with the AC microgrid, the passive method detection blind area of ​​the DC microgrid is larger

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  • DC microgrid island detection method based on mppt trapezoidal voltage disturbance
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  • DC microgrid island detection method based on mppt trapezoidal voltage disturbance

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Embodiment Construction

[0045] The technical solution will be described in detail below with reference to the accompanying drawings.

[0046] In the present invention, by making appropriate changes to the MPPT strategy, the output power of the PVA fluctuates according to the periodic trapezoidal signal near the maximum power, thereby causing the PCC voltage to fluctuate periodically after the islanding occurs. Theoretical analysis determines that islanding occurs in the DC microgrid. Moreover, when multiple PVAs in the same area supply power to the load at the same time, considering that the disturbances imposed by different PVAs may cancel each other and thus reduce the accuracy of islanding detection, the invention proposes a disturbance synchronization scheme to ensure the reliability of islanding detection.

[0047] The DC micro-grid island detection method based on MPPT trapezoidal voltage disturbance of the present invention comprises steps:

[0048] Step 1, start the MPPT strategy, and set th...

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Abstract

The invention discloses a DC micro-grid island detection method based on MPPT trapezoidal voltage disturbance. The steps are to start the MPPT strategy, set the start signal threshold of the disturbance, measure the output current value of the PVA at the maximum power operation, and calculate the same environmental coefficient of PVA with different capacities under the same light intensity and temperature in real time. When the environmental coefficient is greater than the set When the startup signal threshold of the disturbance is reached, the control performs periodic trapezoidal disturbance on the PVA port voltage reference value; the PCC voltage value U is detected pcc When it exceeds the threshold set by the passive method, it is judged as an isolated island, otherwise it is judged as U pcc The variation law of and the calculated value U of PCC voltage under trapezoidal disturbance pccp Whether the change rules of the islands are consistent; if they are consistent, it is an isolated island, otherwise it is a pseudo-isolated island. In the present invention, the active type and the passive type are combined to detect DC islands, and cooperate with each other, so there is no detection blind area.

Description

technical field [0001] The invention belongs to the technical field of power system protection and control, and relates to a DC micro-grid island detection method based on MPPT trapezoidal voltage disturbance, which is suitable for distributed generation (Distributed Generation, DG) containing multiple photovoltaic power generation systems. Background technique [0002] New energy power supply and grid power supply complement and coordinate each other, which is an ideal way to comprehensively utilize existing energy to provide users with reliable and high-quality electric energy. As an important part of the new energy power supply system, photovoltaic power generation has achieved considerable development due to its advantages of no noise, no pollution, and no geographical restrictions. In a microgrid equipped with a photovoltaic power generation system DG, when the grid stops supplying power to the load due to failure or maintenance, the DG fails to detect the power outage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G01R31/00
CPCH02J3/388G01R31/00H02J2300/26Y02E10/56H02S50/00G05F1/67H02J1/12H02J1/106Y02P80/14H02S40/30H02J13/00002H02J1/10H02S10/00
Inventor 陈晓龙杨志颖李斌李永丽李博通
Owner TIANJIN UNIV
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