A compensation method for uncertain large time delay suitable for new energy generators

Abstract

The invention discloses a compensation method suitable for uncertain large time delay of a new energy electric generator. The compensation method comprises the following steps: using a parameter adaptive control method of Fibonacci sequence and time scale to establish a linear ADRC, and outputting a controlled quantity of a grid-connected inverter; using a mutual correlation method and a sliding window digital signal processing method, and calculating and obtaining uncertain large time delay according to the controlled quantity and the output current of the grid-connected inverter; adopting a Smith predictor to calculate and obtain the controlled quantity of the grid-connected inverter of the new energy electric generator, so as to realize compensation of the large time delay and the adaptive robust control of the new energy electric generator. The compensation method can accurately estimate the uncertain large time delay of the new energy electric generator, reduces the overshoot of the output current of the new energy electric generator, shortens the regulating time, and improves the operational stability and the robustness of the new energy electric generator.

Description

technical field [0001] The invention relates to an uncertain large time lag compensation method, in particular to a compensation method for uncertain large time lag suitable for new energy generators. Background technique [0002] With the intensification of the energy crisis and the continuous development of the micro-grid system, new energy generators such as photovoltaics, wind power, fuel cells, and ocean current power have been widely and massively used in modern power systems. However, the rapid increase in the number of new energy generators not only increases the complexity of the power system communication network, but also increases the communication distance and reduces the robustness of communication interference. At this time, the system-level Uncertain Bid Time Delay (UBTD) generated by the power system communication network has become a problem that cannot be ignored. [0003] As the core equipment of new energy generators, grid-connected converters have dire...

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Problems solved by technology

According to the mathematical model of the grid-connected inverter based on the discrete domain state equation, due to the influence of factors such as the uncertain large time delay d, the sum of disturbances w, and the nonlinear characteristics of the LCL filter, the traditional control method has been unable to achieve Accurate and reliable control of new energy generators with uncertain large time lags is also the main reason why traditional control methods are not ideal in actual engineering and it is difficult to achieve fast and stable tracking of the output current of new energy generator grid-connected inverters

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