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Photovoltaic inverter leakage current detection method

A technology of leakage current detection and photovoltaic inverter, which is applied in the direction of measuring current/voltage, instruments, measuring electricity, etc., can solve the problem that the leakage current detection method of photovoltaic inverter cannot comprehensively consider and quantify the leakage current change rate and its action time And other issues

Active Publication Date: 2010-11-10
SHANGHAI CHINT POWER SYST +1
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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing photovoltaic inverter leakage current detection method cannot comprehensively consider and quantify the leakage current change rate and its action time, and aims to provide a photovoltaic inverter based on a weighted moving average prediction method. Transformer leakage current detection method, the method of monitoring and protecting the rate of change through the weighted accumulation method, can be applied to the field of dynamic protection with time ladder characteristics

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Embodiment Construction

[0040] The photovoltaic inverter leakage current detection method of the present invention comprises the following steps:

[0041] 1. Weighted moving average forecasting algorithm

[0042] Set the motion equation of the object as y=f(x), and the object time starts from x k change to x k+n , the motion state correspondingly changes from y k change to y k+n , then the degree of change during this period can be expressed by the incremental area (below figure 1 middle shaded area). Using the equivalent principle of impulse, the definition of incremental area ΔS can be expressed by formula (1):

[0043] ΔS = ∫ x k x k + n f ( x ) dx - f ( x k ) × ( ...

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Abstract

The invention provides a photovoltaic inverter leakage current detection method based on an exponentially weighted moving average forecasting method. The change degree of leakage current is quantified as the integral of the leakage current and the action time thereof, and by the exponentially weighted moving average forecasting method, dynamic protection on the leakage current is realized. Simulation and experiment results show that the method has effective protection on dynamic leakage current change, meeting the requirements of safety specifications, and the method can be applied to the field of dynamic protection with a time step characteristic.

Description

technical field [0001] The present invention relates to the field of inverters, in particular to the field of photovoltaic inverter leakage current detection, in particular to a photovoltaic inverter leakage current detection method based on a weighted sliding average prediction algorithm, which can be used for applications with ladder time protection characteristics occasion. Background technique [0002] In photovoltaic inverter products, there are many types of software protection. From the perspective of protection response speed, there are instantaneous value protection, steady state value protection, root mean square value protection and rate of change protection, etc. In the VDE0126-1-1, 2006-02 standard, leakage current protection needs to be divided into two types: static protection and dynamic protection. Since dynamic protection requires different reaction times for different rates of change, but it does not clearly indicate the quantitative index of the rate of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R19/10
Inventor 徐锡军张彦虎
Owner SHANGHAI CHINT POWER SYST
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