Island power grid optimization power distribution method based on fuzzy PI-PD droop control
A PI-PD, island grid technology, applied in the direction of converting irreversible DC power input to AC power output, reducing/preventing power oscillation, electrical components, etc., can solve the complex parameter selection and setting, low flexibility and adaptability , the control effect is not satisfactory, etc., to achieve the effect of broadening the practical application, improving the anti-interference ability, and improving the modulation effect
Pending Publication Date: 2020-09-18
SICHUAN UNIV
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Problems solved by technology
However, although PI control has the advantages of simple structure and easy digitization, it cannot have a good modulation effect when it is affected by factors such as grid fluctuations or noise.
There are also appealing problems for the PID controller, and the selection and setting of its parameters are relatively complicated
Therefore, if the relevant parameters of the PI or PID controller remain unchanged, the control effect of the microgrid under the influence of external factors will be unsatisfactory, and the flexibility and adaptability will be relatively low, so it has great potential in practical applications. big limit
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[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0033] In this embodiment, the following implementation steps are completed:
[0034] A. Build a droop control model with a fuzzy PI-PD controller, where the fuzzy PI controller is composed of a fuzzy controller and a traditional PI controller.
[0035] B. Set the line parameters, given voltage and given frequency in the droop control model, calculate the power, set the input set and fuzzy rule table required by fuzzy control.
[0036] C. Calculate the deviation value and deviation rate after comparing the voltage and frequency output by the inverter during the operation of the microgrid with the set value, and construct the input set of the fuzzy PI controller, where the frequency deviation is f Δ (t), frequency deviation rate of change The voltage deviation is v Δ (t) and the rate of change of voltage deviation The calculation process o...
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The invention discloses an island power grid optimization operation method based on fuzzy PI-PD droop control. The method comprises: building a droop control model added with a fuzzy PI-PD controller,wherein the fuzzy PI controller is composed of a fuzzy controller and a traditional PI controller; setting an input set and a fuzzy rule table required by fuzzy control; transmitting the deviation ofvoltage and frequency and the deviation change rate to the fuzzy controller, outputting the set KP and KI to the traditional PI controller, processing the KP and KI through a PD controller, and outputting a result; adding a new voltage parameter into a reactive droop control link, enabling a frequency parameter to pass through a unit integral link for 1 / s (s is a pull operator), and adding into an active droop control loop; and performing voltage synthesis on the parameters obtained in the two links to obtain a reference voltage. According to the invention, system output is adjusted in real time according to changes of voltage and frequency, so that voltage and frequency deviation is reduced, the anti-interference capability of the microgrid during operation is improved, the robustness ofthe system is enhanced, and the stability and reliability of the system are improved.
Description
technical field [0001] The invention relates to the technical field of micro-grid control, in particular to a fuzzy PI-PD droop control-based method for optimal power distribution of island power grids. Background technique [0002] With the increasing shortage of fossil energy such as petroleum and coal and the international attention to environmental protection in recent years, how to develop renewable and clean energy has become the focus of current energy development. Therefore, the distributed generation unit (DG) based on small renewable clean energy has become the key research object of various countries and has achieved rapid development. Among them, the microgrid can efficiently control and distribute power to small power generation units, so it is widely used in the control of distributed power generation. Generally, it can be divided into two categories according to the control method of the inverter: master-slave control and droop control. Compared with the mas...
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IPC IPC(8): H02J3/38H02J3/46H02J3/24H02M7/48
CPCH02J3/388H02J3/381H02J3/46H02J3/466H02J3/24H02J3/241H02M7/48H02J2203/10H02J2203/20
Inventor曾成碧王翰文苗虹李苏丹童广朱胤杰龚锐
OwnerSICHUAN UNIV