Voltage regulation and stabilization of DC/DC buck converter under constant power loading
Abstract: The low and medium voltage renewable energy based dc distribution systems are catching increased attention world-wide due to their inherent benefits over ac systems. Higher efficiency, simple control, more suitable for integration of the sources producing dc power, are some of the main benefits of the dc systems. However, these systems are prone to serious stability issues caused by the constant power load (CPL) nature of the point-of-load converters (POLs). This paper deals with the stabilization and voltage regulation of dc/dc buck converter feeding a combination of the constant voltage resistive load (CVL) and CPL in a dc micro-grid application. A sliding mode controller is proposed which ensures supply of constant power demanded by the CPL and tight voltage regulation (error less than 0.1 V) of the output voltage. The effectiveness of the controller is validated through simulation results under different operating conditions. It is shown that the controller is robust to the large changes in supply voltage and the load.
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Citations
99 citations
Cites background from "Voltage regulation and stabilizatio..."
...Authors in [92], have proposed a PWM based sliding mode control using a nonlinear switching function, to mitigate negative impedance instabilities in a dc/dc buck converter supplying mixed load (CPL and CVL)....
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61 citations
Cites background from "Voltage regulation and stabilizatio..."
...In [77] the stable sliding surface (s), shown in Figure 13a, is designed to obtain system control law (u) is to meet the system stability requirements with reference values for the inductor current and capacitor voltage....
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References
1,789 citations
"Voltage regulation and stabilizatio..." refers methods in this paper
...Sliding mode control (SMC) is a well known technique to design robust controllers [8], [9]....
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762 citations
"Voltage regulation and stabilizatio..." refers methods in this paper
...Sliding mode control (SMC) is a well known technique to design robust controllers [8], [9]....
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696 citations
"Voltage regulation and stabilizatio..." refers background or methods in this paper
...Sliding mode control approach have also been applied to stabilize dc/dc converters against CPL induced instabilities [1], [2], [7], [10]–[15]....
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...in [1] have proposed a SMC which ensures the supply of the constant power needed the CPL, however, proposed controller does not maintain a constant voltage....
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...The current drawn by the CPLs increases/decreases with the decrease/increase in the voltage across its terminals which may cause limit cycles in the voltage and current and may lead to instability of the overall system even if individual converters are stable [1]–[7]....
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447 citations
"Voltage regulation and stabilizatio..." refers methods in this paper
...Sliding mode control approach have also been applied to stabilize dc/dc converters against CPL induced instabilities [1], [2], [7], [10]–[15]....
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164 citations
"Voltage regulation and stabilizatio..." refers methods in this paper
...Some of the techniques among many others, proposed in the literature for the stabilization of the CPL induced instabilities are power shaping based Brayton-Mayer’s mixed potential function [3], coupling induced open loop stabilization [5], [6], and sliding mode control....
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