Abstract
Power Quality (PQ) improvement in distribution level is an increasing concern in modern electrical power systems. One of the main problems in low voltage (LV) networks is related to load voltage stabilization close to the nominal value. Usually this problem is solved by smart distribution transformers, hybrid transformers and solid-state transformers, but also dynamic voltage conditioners (DVC) can be an innovative and a cost effective solution. The paper introduces a new control method of a single-phase DVC system able to compensate these long duration voltage drifts. For these events, it is mandatory to avoid active power exchanges so, the controller is designed to work with nonactive power only. Operation limits for quadrature voltage injection control is formulated and reference voltage update procedure is proposed to guarantee its continuous operating. DVC performance for main voltage and load variation is examined. Proposed solution is validated with simulation study and experimental laboratory tests. Some simulation and experimental results are illustrated to show the prototype device's performance.
Highlights
P OWER quality (PQ) in modern power systems is an high demanding concern in both medium voltage (MV) and low voltage (LV) networks for all industrial, commercial, and domestic users [1].Different PQ problems has been reported and categorized [2]
An active voltage conditioner able to cover both long, short- and fast-term events, can perfectly satisfy modern power system requirements as the dynamic voltage conditioners (DVC) proposed by the authors in their previous work through simulation study [20]
This paper presents a single-phase DVC as an economic voltage controller for LV distribution smart grid systems, which makes the proposal an appreciated solution for distribution system operators (DSOs) [21]
Summary
P OWER quality (PQ) in modern power systems is an high demanding concern in both medium voltage (MV) and low voltage (LV) networks for all industrial, commercial, and domestic users [1]. An active voltage conditioner able to cover both long-, short- and fast-term events, can perfectly satisfy modern power system requirements as the DVC proposed by the authors in their previous work through simulation study [20]. This paper presents a single-phase DVC as an economic voltage controller for LV distribution smart grid systems, which makes the proposal an appreciated solution for DSO [21]. Even if the device has the capability to support short- and fast-term voltage variations for few cycles with active power coming from DC bus capacitor storage system, only DVC long-term operation limits will be analyzed in detail here, so sag/swell will not be covered by this work because several solutions are just presented, as in [12] and [13], and they can be implemented and added to the DVC functions. Simulation and laboratory based experimental results in the grid voltage range from 0.9 to 1.1 p.u. are reported at Section IV and discussions and conclusions are pointed out at Section V
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