Fast Detection and Calculation Method of Fundamental Wave and Harmonics of General-frequency Single-phase AC Power Supply
A single-phase AC, calculation method technology, applied in spectral analysis/Fourier analysis and other directions, can solve the problems of inability to meet the requirements of ready-to-use and difficult to detect accurately, and achieve the effect of convenient application and accurate detection
Active Publication Date: 2015-09-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER +2
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Problems solved by technology
[0003] The invention aims at the problem that the traditional harmonic detection method based on the instantaneous reactive power theory is difficult to meet the requirements of accurate detection, and at the same time it cannot meet the needs of immediate purchase and use. Based on the traditional harmonic detection method based on the orthogonal transformation method, the phase-locked loop (PLL) is used to obtain the mains frequency in real time, and to solve the actual number of sampling points during work, realizing a new fundamental wave, harmonic detection method
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[0017] Such as figure 1 The block diagram of the traditional integral-based orthogonal transformation algorithm is shown in the figure. as a signal; is an adder; X is a multiplier; PLL is a phase-locked loop; is the output fundamental wave; for the output harmonics.
[0018] Through the traditional orthogonal change algorithm, using a fixed sampling frequency of 20kHz, a fixed power grid fundamental frequency of 50Hz, and a fixed accumulation point, the projected peak value is obtained as:
[0019] ;
[0020] ;
[0021] is the projected peak value of the fundamental wave signal on the d-axis of the orthogonal transformation coordinate system;
[0022] is the projected peak value of the fundamental wave signal on the q-axis of the orthogonal transformation coordinate system.
[0023] Such as figure 2 The block diagram of the pass-frequency type orthogonal transformation algorithm is shown, and the pass-frequency orthogonal change algorithm, if the ratio is ...
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The invention relates to a rapid detection and calculation method for the fundamental wave and the harmonic wave of a direct frequency type single phase alternating current power supply. In a traditional harmonic wave detection mode based on an orthogonal transformation method, commercial electricity frequency can be acquired in real time by a phase locked loop, actual sampling points can be solved in work, a projection peak value of d and q axes of an orthogonal coordinate system is extracted, and a novel detection method for the fundamental wave and the harmonic wave is realized. The method can be used for rapidly and accurately detecting and separating signal waveforms, can meet the requirement that a distributed power generation system accurately acquires the fundamental wave and the harmonic wave at a public access point in real time, and is free of adjusting whole algorithm parameters, capable of realizing plug and play as well as modularization under a wide range condition and convenient to use.
Description
technical field [0001] The invention relates to a power system detection technology, in particular to a fast detection and calculation method for the fundamental wave and harmonics of a frequency-pass type single-phase AC power supply. Background technique [0002] In the smart grid and micro grid system, a large number of distributed power generation systems using wind and solar power are connected, especially on the distribution network side, single-phase grid-connected inverters are the core of energy conversion and control in distributed power generation systems , and the interface with the distribution network, its performance directly affects and determines the quality of the entire grid-connected system. However, single-phase grid-connected inverters using full-control devices will generate a large number of harmonic components, which directly affect the power quality of the distributed system connected to the grid. If the fundamental and harmonic components of the v...
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IPC IPC(8): G01R23/16
Inventor 赵晋斌张元吉唐龙江王文林
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER