## 1 Introduction
The converters based on this approach mentioned in [1; 13] have positive or negative voltage gain, so they can only address either voltage sag or swell issue. The direct AC-AC converters reported in [14; 15; 16] use a z-source structure to ensure the dual polarity voltage. This structure also facilitates tackling the shoot-through challenge of the complementary operated switching devices. Z-source structure is a specific arrangement of many inductors and capacitors that not only result in large size or cost but also it is a big source of slow system's dynamic behavior. The deficiencies resulting from these power converting approaches are tackled with other AC-AC techniques applied in non-z-source structures as reported in [17; 18; 19; 20]. The converter employed with the structure reported in [3] has bipolar voltage buck characteristics, and its application is only limited to the compensation of the low depth level power quality issues. Conversely, the voltage controllers as applied in [4] have only voltage boosting features. It can only tackle the power quality problem where the voltage correcting level is more than 50%. These stated voltage controllers lack the compensation for all depth level problems required for reliable operation in the power system. Voltage buck and boost operation ensure the generation of correcting voltage for any depth level problem. Such voltage compensating techniques are addressed in [19; 20]. The power converters, as stated in [19], can generate correcting voltage with any polarity but its operation is only limited to voltage buck-boost capabilities. This circuit has many serious power quality concerns, such as a high ripple in the inductor current and output capacitor voltage. Furthermore, a high value of operating current and break-over voltage is the main source of high losses. It also increases the power rating of solid-state devices. The buck and boost operation rather than buck-boost can be employed to address these concerns. One of such approaches as illustrated in Figure 1 is stated in [20]. The realization of this approach requires the use of eight high switching diodes and eight metal-oxide field-effect transistors (MOSFETs). Each diode and MOSFET form a pair that converts the bidirectional current conduction characteristics of a MOSFET into unidirectional. These current conduction capabilities block the conduction of the MOSFET's body diode that has very slow reverse characteristics. This arrangement also ensures the elimination of the shoot-through issue that avoids the current interruption of the inductor. The main issue of such topology is the use of a large number of diodes and especially transistors. The on and off control of a transistor is a big challenge, especially once it is connected to a high voltage side (a situation in which the reference terminal of the transistor is not connected to the reference point of the circuit). Switching of transistors (MOSFETs) in such circumstances requires the use of a reliable gate supporting circuit. This circuit may be implemented with a number of passive components, microelectronic devices, and separate isolated DC sources. This arrangement increases the volume and cost of the overall system as the size of the gate operating circuit is always much larger than the operating transistor. There are also some associated control circuit losses as addressed in [21; 22]. In keeping these constraints, we have eliminated the use of two diodes and two transistors in our newly developed power converting approach that can generate the same outputs as obtained in [20]. The reduction of two transistors compacts the size of the converter as there is the elimination of two gate operating circuits and two separate isolated DC sources. This overall arrangement lowers the size, cost, and losses of the system. Figure 1: Buck-boost voltage controller reported in [20]. The rest of the arrangement of this article includes the introduction of the proposed topology and its operating modes in Section 2.