^{1}

This paper proposes an offset-free proportional-type output voltage-tracking algorithm embedding the disturbance observers (DOBs) for the

The DC/DC converters have been widely utilized to supply a high quality DC power despite the disturbances for a variety of industrial applications such as uninterruptible power supply and solar photovoltaic systems [

The cascade output voltage control strategy [

There have been many alternative solutions based on the novel control strategy for the inner loop to attain a better closed-loop performance, which includes the deadbeat controllers [

This article presents a robust output voltage-tracking algorithm based on a systematical multi-variable approach without tracking error integrators for the

This section briefly describes the dynamical equations of the synchronous-type

Interleaved DC/DC boost converter circuit.

Due to an abrupt load current variation and the parameter uncertainties, such as inductance and capacitance values, the converter dynamics of (

Let

In order to achieve the control objective of (

The substitution of the inductance current reference of (

Assuming that the disturbance of

In [

For deriving the final control action, write the inductor current-tracking error dynamics using (

Proposed controller structure.

The substitution of the proposed control law of (

Assuming that the disturbance of

Lemma

Finally, Theorem

Assuming that the assumptions of Lemmas

Note that, interestingly, although the proposed proportional-type control law of (

The closed-loop system always eliminates the offset errors of the output voltage in the steady state. That is,

The current and output voltage DOB dynamics can be described in a first-order LPF form (for details, see Appendix):

This section evaluates the output voltage-tracking performance between the proposed and FL methods using the PowerSIM (PSIM) software with the DLL block embedding the control algorithms in the C-language. To this end, a four-phase interleaved DC/DC boost converter was considered with the parameters

Implementation of the closed-loop system.

The FL controller in [

In the first stage, the evaluation of the output voltage-tracking performance with the resistive load of

Output voltage-tracking performance comparison between proposed and FL methods with resistive load of

Disturbance estimation behaviors.

In the second stage, the evaluation of the closed-loop robustness was carried out through investigating the output voltage-tracking performance variations under the same output voltage reference with the different resistive loads,

Output voltage-tracking performance comparison between proposed and FL methods at three resistive loads,

In this simulation setting, the closed-loop tracking performance was quantitatively compared for the resistive loads,

Quantitative output voltage-tracking performance comparison for resistive loads,

Load resistance value | ||||
---|---|---|---|---|

| | | | |

Proposed Method | ||||

| 23281 | 7700 | 4558 | 1722 |

| 10 | 7 | 5 | 4 |

Classical Method | ||||

| 83654 | 58191 | 16325 | 29917 |

| 35 | 35 | 11 | 8 |

In the last stage, the evaluation of the output voltage regulation performance was conducted by using the pulse resistive load from

Output voltage regulation performance comparison between proposed and FL methods at the output voltage 150 V with the pulse resistive load from

This section experimentally verifies the performance of the proposed method by comparing it with the FL technique used in the previous section. In this experiment, a

Experimental setup.

Except for design parameters of

In the first stage, the evaluation of the output voltage-tracking performance was experimentally performed with an increasing output voltage reference from

Experimental results of output voltage-tracking performance comparison between proposed method and FL methods with resistive load

Experimental results of output voltage-tracking performance comparison between proposed and FL methods with resistive load

The second stage examines the output voltage regulation performance regarding two step load changes; the resistive load was changed from

Experimental results of output voltage regulation performance comparison between proposed and FL methods regarding to resistive load variation from

Experimental results of output voltage regulation performance comparison between proposed and FL methods regarding to resistive load variation from

From these simulation and experimental results, it can be concluded that the proposed method has the two practical merits:

The proposed method would suggest an almost same closed-loop performance for various operating ranges without any gain scheduling method.

The proposed method simplifies the control algorithms by getting rid of the use of the tracking error integrators with the antiwindup algorithms.

This paper suggests a performance recovery output voltage-tracking controller for an unknown

This section provides the proofs of lemmas and theorems. The proof of Lemma

The combination of the nonlinear observer of (

The proof of Lemma

The combination of the nonlinear observer of (

The proof of Theorem

The composite-type positive definite function defined as

The proof of Theorem

As can be seen in the proof of Theorem

The author declares that there are no conflicts of interest regarding the publication of this paper.

This research was supported by a grant from Transportation & Logistics Research Program (TLRP) (17TLRP-C135446-01, Development of Hybrid Electric Vehicle Conversion Kit for Diesel Delivery Trucks and its Commercialization for Parcel Services) funded by Ministry of Land, Infrastructure and Transport of Korean Government.