Influence of DVR on Adjacent Load and Its Compensation Strategy Design Based on Externality Theory

Abstract

Dynamic voltage restorer (DVR) is a compensation device that can effectively improve power quality, and it is widely used to compensate the voltage sag on sensitive loads. However, DVR will affect the operation of the sensitive loads in parallel at the same busbar (such parallel are defined as adjacent loads) in the process of improving sensitive load voltage quality. With the externality theory, this paper proposes a solution to clarify the influence of DVR on the adjacent load and handle the possible controversy. This paper first establishes a simple system that consists of a DVR, sensitive loads, and adjacent loads. Based on the equivalent network, the influence of the DVR on the adjacent load is analyzed in terms of voltage change and power consumed. The externality boundaries are clearly defined when considering network parameters in order to fairly deal with the interaction of multi entities. Afterwards, an optimization compensation strategy that is based on externality theory is proposed. Finally, the simulation on compensation strategy is tested on the MATLAB/Simulink platform to demonstrate the feasibility and effectiveness of the proposed method.

Providing Fault Ride-Through Capability of Turbo-Expander in a Thermal Power Plant

“…This strategy brings the least disturbance to the load side due to maintaining precisely the phase angle of the supply voltage in the pre-fault amount. Thus, this strategy is very appropriate for sensitive loads to the supply-voltage phase angle [20]. As shown in Figure 3, the injected voltage magnitude of the pre-sag strategy is higher than the in-phase strategy.…”

“…The three main compensation strategies are pre-sag, in-phase, and minimum injected active power (energy-optimized). In this section, all compensation strategies and their combinations are considered from various aspects [18][19][20][21][22][23][24].…”