Transient equivalent impedance identification method for photovoltaic power system based on ADPSS
A photovoltaic power generation system and equivalent impedance technology, applied in the field of power grids, can solve the problems of inability to monitor photovoltaic power generation systems, inaccurate monitoring results, and strong limitations.
Active Publication Date: 2019-02-22
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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[0003] The existing monitoring methods for transient equivalent impedance of photovoltaic power generation systems include fuzzy monitoring method and substitution method. Monitoring of the entire photovoltaic power generation system in a designated area, with strong limitations
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[0035] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples. The transient equivalent impedance identification method of a photovoltaic power generation system based on ADPSS, such as figure 1 shown, including the following steps:
[0036] Step 1. Measure various parameters affecting the transient equivalent impedance of the photovoltaic power generation system and define various functions. Measure various parameters affecting the transient equivalent impedance of the photovoltaic power generation system including: atmospheric pressure P=101Kpa, equivalent cross-sectional area of the transmission line S=120mm 2 And the equivalent length of the transmission line L=3Km; define various functions including: the light intensity function I(t), the temperature function T(t), the humidity function H(t), the wind speed function V(t) in the area where the photovoltaic power generation system is located );
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Transient equivalent impedance identification method of photovoltaic power generation system based on ADPSS includes the following steps: measuring the parameters affecting the transient equivalent impedance of photovoltaic power generation system and defining various functions; Calculating equivalent resistivity; Calculate the equivalent resistance; Calculate equivalent reactance; Calculate equivalent impedance; The accuracy of equivalent impedance is verified based on ADPSS. The invention considers the temperature of the area where the photovoltaic power generation system is located, Humidity, atmospheric pressure, wind speed and other environmental factors on the transient equivalent impedance of photovoltaic power generation system, can monitor the transient equivalent impedance changes over time, to obtain the transient equivalent impedance of photovoltaic power generation system, on the one hand for the calculation of photovoltaic power generation system transient voltage, current, power and other quantities to provide a reliable basis; On the other hand, in order to improve the transient stability of photovoltaic power generation system, the measures taken to provide theoretical guidance, and then improve the transient stability of photovoltaic power generation system, and ultimately improve the operation level and production efficiency of photovoltaic power generation system.
Description
technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a method for identifying transient equivalent impedance of a photovoltaic power generation system based on ADPSS. Background technique [0002] In recent years, with the continuous improvement of the utilization rate of renewable energy, photovoltaic power generation systems have developed rapidly. Since the photovoltaic power generation system is easily affected by the external environment during operation, when the photovoltaic power generation system operates transiently, its transient equivalent impedance will change momentarily with the continuous change of the external environment. Therefore, whether the transient equivalent impedance of the photovoltaic power generation system can be accurately monitored is a problem faced by the photovoltaic industry. [0003] The existing monitoring methods for transient equivalent impedance of photovoltaic power generat...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/20Y02E60/00
Inventor 彭书涛张海宁左宝峰张星王峰金吉良邓俊李小腾徐得超彭红英王祥旭王艺璇刘敏陈绪江
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST