A Multi-Slope Sliding-Mode Control Approach for Single-Phase Inverters under Different Loads

Abstract

Abstract:In this paper, a new approach to the sliding-mode control of single-phase inverters under linear and non-linear loads is introduced. The main idea behind this approach is to utilize a non-linear, flexible and multi-slope function in controller structure. This non-linear function makes the controller possible to control the inverter by a non-linear multi-slope sliding surface. In general, this sliding surface has two parts with different slopes in each part and the flexibility of the sliding surface makes the multi-slope sliding-mode controller (MSSMC) possible to reduce the total harmonic distortion, to improve the tracking accuracy, and to prevent overshoots leading to undesirable transient-states in output voltage that occur when the load current sharply rises. In order to improve the tracking accuracy and to reduce the steady-state error, an integral term of the multi-slope function is also added to the sliding surface. The improved performance of the proposed controller is confirmed by simulations and finally, the results of the proposed approach are compared with a conventional sliding-mode controller (SMC) and a synchronous reference frame PI (SRFPI) controller.

An improved robust coupled sliding mode control strategy for solar photovoltaic‐based single‐phase inverters

“…28 In the same way, β is the gain value for the sensed actual voltage across the DC-Link capacitor terminals, thus the value will be the ratio of actual voltage to the reference voltage. Practically, the value of d 1 levels between the two extremes as given in (20).…”

“…Here, all the subsets of the candidate function with the sliding function S b are bounded with real numbers between the two extremes as expressed in (20). Hence, the function V is also bounded between the extremities.…”

“…In the same way, rotating sliding surface with single slope was developed in Komurcugil 19 to enhance the responses for dynamic load variations, thereby the sliding surface rotates on the sliding plane. The single slope SMC was upgraded to multiple slope SMC in Khajeh‐Shalaly and Shahgholian 20 by having two regions on the sliding regime, in which two different slopes are considered with multi‐slope function coefficients providing a high speed transient responses. The emergence of intelligent SMC with Fast Terminal SMC (FTSMC) was proposed in Chang, 21 which performed a better dynamic characteristics for uncertain perturbations occurring in the DC‐link voltage.…”

A New Predictive Control Strategy for Multilevel Current-Source Inverter Grid-Connected

“…The SMC with these attractive properties is applied to control the three-phase rectifier, single-phase and three-phase grid-tied converters [20]. In Reference [21] a new approach to the sliding-mode control of single-phase inverters under linear and non-linear loads is introduced. The main idea behind this approach is to utilize a non-linear, flexible and multi-slope function in controller structure.…”

A floating-output interleaved boost DC–DC converter with high step-up gain

“…In these applications, a high step-up converter is required to adapt the low voltage level of batteries or photovoltaic cells to the high-voltage DC bus [7,8]. In order to perform this voltage conversion, various isolated DC-DC converters are presented in which high voltage gain can be achieved by increasing the transformer turns ratio [9,10]. Nevertheless, these converters suffer from high circulating currents, high voltage stress and low efficiency [11,12].…”