Improved BP setting fractional order PID grid-connected inverter control method

A control method and fractional-order technology, applied to controllers with specific characteristics, electric controllers, etc., can solve problems such as difficult control, complex time-varying, coupling and nonlinearity of three-phase inverter control systems, and achieve Achieve stable control, reduce THD value, and improve robustness

Pending Publication Date: 2022-02-18
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

The three-phase inverter control system is relatively complex with time

Method used

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  • Improved BP setting fractional order PID grid-connected inverter control method
  • Improved BP setting fractional order PID grid-connected inverter control method
  • Improved BP setting fractional order PID grid-connected inverter control method

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0040] The topology control structure of the three-phase LCL grid-connected inverter is as follows: figure 1 as shown, figure 1 Including LCL filter, mainly by the inverter side inductance L 1 , filter capacitor C f and grid side inductance L 2 Poses, S 1 ~S 6 It is the switching tube IGBT of the grid-connected inverter; U dc is the DC side voltage, C is the DC side filter capacitor, i c is the capacitive current, i 1 is the DC side current, i 2 is the grid current.

[0041] Such as figure 2 The schematic diagram of the structure of the control loop of the outer loop of th...

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Abstract

The invention relates to an improved BP setting fractional order PID grid-connected inverter control method. A fractional order PID controller is adopted for inductive current outer loop control, a proportional compensator is adopted for a capacitive current inner loop to control a three-phase LCL grid-connected inverter, and parameter setting is performed on a proportionality coefficient Kp, an integral coefficient Ki, a differential coefficient Kd, an integral order lambda and a differential order mu in the fractional order PID controller by adopting a BP neural network. Multivariable fractional order PID control acts on an inductive current outer loop, so that the system has better robustness, and the THD value of grid-connected current is greatly reduced; and a proportional controller is used as a capacitive current inner loop to realize double-closed control. In order to solve the parameter setting problem caused by introduction of the fractional order PID algorithm, an improved BP neural network algorithm is adopted to identify and optimize parameters, stable control over grid-connected inversion is achieved, and the robustness of the system is improved.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to an improved BP-adjusted fractional-order PID grid-connected inverter control method. Background technique [0002] With the development of renewable energy grid-connected power generation technology, high-power grid-connected inverter control technology has become a research hotspot. The field of energy research and development is mainly reflected in three manifestations of light, heat and chemical utilization. Among these three forms, the application of photovoltaics in battery technology is the most critical form. Solar energy resources are relatively abundant in most areas of the country, and the average amount of sunshine can reach more than 2,000 hours in a year. In terms of photovoltaic power generation, my country has sufficient resource reserves. On the other hand, photovoltaic power generation is a sustainable and renewable energy source, and it can also solve the pro...

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Application Information

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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 杨旭红吴亚雄金宏艳李辉方浩旭张苏捷
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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