Fractional order fuzzy PID control method for DC/DC converter
A fractional-order fuzzy, control method technology, applied in general control systems, adaptive control, control/regulation systems, etc., can solve problems such as poor work performance, achieve control flexibility, improved accuracy, and robust response , the effect of improving the control effect
Pending Publication Date: 2021-04-20
SHENYANG INST OF ENG
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At the same time, there are also big problems in the practice of PID controllers. PID controllers have poor performance when controlling nonlinear, time-varying, coupling, and complex processes with uncertain parameters and structures.
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[0048] Example: such as figure 1 As shown, in a DC microgrid, DC power sources such as photovoltaics and wind energy transmit DC power to constant power loads through DC / DC converters, and the fractional-order fuzzy PID controller acts on the DC / DC converter to eliminate constant power loads. The instability of the DC / DC converter in the DC microgrid caused by the negative impedance characteristics of the system. The internal structure of the controller is as follows figure 2 As shown, it is composed of the integral term in the fractional-order PID controller, the differential term and the proportional term in the PID controller replaced by a fuzzy controller with one input and one output.
[0049] Step 1. Calculate the deviation e(t) between the input and the output;
[0050] e(t)=r(t)-y(t)
[0051] Among them, t is time, r(t) is input quantity, y(t) is output quantity. The control object of this control method is the DC / DC converter, the controlled quantity is the outpu...
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The invention provides a fractional order fuzzy PID control method for a DC / DC converter, and relates to the technical field of power system control. The method comprises the steps of 1 calculating the deviation value e (t) between input and output; 2 subjecting the e (t) to an integration link to obtain an output control quantity KiD-lambda e (t); 3 subjecting the e (t) to a differential link to obtain an output control quantity KdDmue (t); 4 searching parameters and storing the parameters, and judging whether the parameters are the last point on a grid or not; 5 performing fuzzy reasoning; 6 performing ambiguity resolution; 7 obtaining an output control quantity u (t); and 8 enabling u (t) to act on the DC / DC converter. According to the invention, the control effect of a controller can be improved, so that the controller has faster and more robust response; the control flexibility and accuracy are greatly improved, the stability of a control system can be improved, and great significance is achieved for improving the instability problem of the DC / DC converter in a direct-current microgrid caused by the negative impedance characteristic of a constant-power load.
Description
technical field [0001] The invention belongs to the technical field of power system control, in particular to a fractional-order fuzzy PID control method for a DC / DC converter. Background technique [0002] The microgrid is a single controllable unit that can meet the requirements of users in the microgrid for power quality, power supply reliability and security. In recent years, the United States, Japan, Australia and other countries have carried out research on microgrid technology. Although DC microgrids have many advantages, they also have some disadvantages, such as instability of DC / DC converters for powering constant power loads. Since the rated power of loads in a DC microgrid has different values, the cascaded distributed structure is the preferred structure for proper power management of power electronic converters. These power electronic converters supply power to constant power loads (Constant Power Load, CPL), which have nonlinear characteristics and bring ins...
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Inventor 赵琰曾雅魏莫杋庄严于思琪罗金鸣姜河王东来马艳娟任书影孙晓东王若曦周航姜铭坤辛长庆叶瀚文
Owner SHENYANG INST OF ENG