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Off-network photovoltaic power station internal harmonic wave load index prediction method

A forecasting method and technology of photovoltaic power plants, applied to load forecasting in AC networks, AC networks to reduce harmonics/ripples, AC network circuits, etc., can solve the problem of inability to coordinate and synchronize analysis, low evaluation accuracy, and ineffectiveness Use power grid resources and other issues to achieve the effects of improving reliability and economy, improving evaluation accuracy, and improving power quality

Inactive Publication Date: 2017-05-31
STATE GRID QINGHAI ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are technical problems that mutual analysis cannot be coordinated and synchronized, grid resources cannot be effectively used, and evaluation accuracy is not high

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  • Off-network photovoltaic power station internal harmonic wave load index prediction method

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0030] Such as figure 1 As shown, an index prediction method for an internal harmonic load index prediction method of an off-grid photovoltaic power station of the present invention is characterized in that it includes the following steps:

[0031] a. Establish the evolution time series of the internal harmonic load index of the off-grid photovoltaic power station;

[0032] b. Construct the m-dimensional phase space of the measurement data time series;

[0033] c. Genetic-ant colony hybrid algorithm processing after phase space reconstruction;

[0034] d. Calculation of the internal harmonic load index of the off-grid photovoltaic power station.

[0035] The time series described in step a is at a series of moments toxb 1 ,toxb 2 ,...,toxb n (n is a natural number, n=1,2,...) To obtain the inverter ou...

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Abstract

The invention discloses an off-network photovoltaic power station internal harmonic wave load index prediction method. The method is mainly used for controlling operation strategies of a photovoltaic power station. The method comprises steps of carrying out real-time monitoring on operation parameters of the photovoltaic power station and meteorological environmental parameters; establishing an off-network photovoltaic power station internal harmonic wave load index evolution time sequence; constructing m-directional phase space for measuring data time sequence; carrying out heredity-ant colony mixing algorithm processing after the construction of the phase space; and calculating the off-network photovoltaic power station internal harmonic wave load index. Through the mutual cooperation of the four steps, the operation strategies of the photovoltaic power station are controlled according to the calculation result in real time, so the electric energy quality of the photovoltaic system can be effectively improved and reliability and economy of a regional electric power system are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a method for predicting an internal harmonic load index of an off-grid photovoltaic power station. Background technique [0002] The power system and its numerous power generation and energy storage devices constitute a complex system. How to evaluate the DC network harmonic concentration index of the off-grid photovoltaic power generation system according to the operating characteristics of the photovoltaic power station, so that the photovoltaic power station can maximize its benefits, and at the same time make the The system can make the most effective and fastest use of grid resources. The characteristic of the existing off-grid photovoltaic power generation system DC network harmonic concentration index evaluation is that it ignores the interaction of photovoltaic power station equipment and its interaction with the external environment, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/003H02J3/01H02J2203/20Y02E40/40
Inventor 杨军王轩宋锐李春来甘嘉田马勇飞
Owner STATE GRID QINGHAI ELECTRIC POWER