MPPT hysteresis control algorithm based on predictions of improved FIR filter

An improved hysteresis control technology, which is applied in the field of MPPT hysteresis control algorithm based on improved FIR filter prediction, can solve problems such as difficult implementation, complicated calculation, and complicated process, so as to reduce disturbance and improve steady-state performance , cost reduction effect

Inactive Publication Date: 2016-11-16
ANHUI ANTAI TECH
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The fuzzy control process needs to sample the data, then calculate, then fuzzify, fuzzy reasoning operation, clarify, and finally get the result. This method is more complicated and requires a CP

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  • MPPT hysteresis control algorithm based on predictions of improved FIR filter
  • MPPT hysteresis control algorithm based on predictions of improved FIR filter
  • MPPT hysteresis control algorithm based on predictions of improved FIR filter

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[0051] In order to make it easy to understand the technical means, creative features, objectives and effects achieved by the present invention, the present invention will be further explained below in conjunction with specific drawings.

[0052] See Figure 1-4 :

[0053] A hysteresis control algorithm for MPPT based on improved FIR filter prediction,

[0054] 1) First, according to the principle of FIR filter, the output power P of the photovoltaic array can be expressed as a linear combination of current and past operating voltages:

[0055] Where V N (n)—The vector of current and past operating voltages of the adaptive predictor; H′ N -The coefficient vector of the adaptive predictor; —The predicted output power of the adaptive predictor; N—the number of linear combinations; h k —Each element of the coefficient vector.

[0056] 2) Improved adaptive adjustment

[0057] The photovoltaic power generation system is in a drastically changing external environment. In order to ensure that...

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Abstract

Provided is an MPPT hysteresis control algorithm based on predictions of an improved FIR filter. The algorithm is characterized in that on the basis of a conventional perturbation observation method, hysteresis control and a self-adaptive prediction mechanism are added, that is to say, output power of the current working voltage can be combined with output power of a photovoltaic array of working voltage before and after predictions in order to form three-point hysteresis control; by determination of a disturbance rule, a distribution direction is determined; while tacking speed is increased, precision of a control system is taken into consideration; step factors of a self-adaptive predictor can be updated in an on-line manner so that convergence performance of the system is improved and steady-state performance of the system is enhanced and loss is reduced; the novel algorithm can compensate for deficiencies of a conventional disturbance observation method in tracking speed and steady-state performance; MPPT control can be rapidly and stably applied so that oscillation and misjudgment of greatest power points can be greatly reduced; dynamic response and steady-state performance of the system are improved; and in addition, the algorithm is easy for realization of software programming.

Description

technical field [0001] The invention relates to the technical field of MPPT algorithms, in particular to an MPPT hysteresis control algorithm based on improved FIR filter prediction. Background technique [0002] At present, the commonly used MPPT algorithms include disturbance and observation method and fuzzy control method. The perturbation and observation method is also called hill-climbing method. Its basic idea is: first perturb the output voltage of the photovoltaic cell, then observe the change of the output power of the photovoltaic cell, and continuously change the direction of the perturbation voltage according to the trend of the power change. Due to the limitation of the actual detection and control accuracy, if the step size of the voltage disturbance is constant, there will be oscillation problems, and because the external environment changes from time to time, the P-U characteristic curve of photovoltaic cells changes from time to time, and misjudgment may occ...

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 孙小娟施剑锋朱卫坪胡朝俊王瑞蒂徐杰胡存刚李力
Owner ANHUI ANTAI TECH
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