Novel coordinated secondary voltage control strategy for efficient utilisation of distributed generations

Abstract

This study presents a novel coordinated secondary voltage control (CSVC) and reactive power management scheme for efficient utilisation of distributed energy resources in a smart distribution network. The proposed controller is developed to achieve efficient voltage regulation and to maximise the dynamic reactive power reserve in a distribution network to react during system contingencies. The simulated distribution system, including an on-load tap changer (OLTC) and distributed energy resources, is implemented using PSCAD/EMTDC. The CSVC is designed to provide slow and medium speed responses, using low-pass filters for OLTC and diesel generators, respectively, and a fast response by utilising inverter-based distributed energy resources. Therefore it applies a control strategy with different bandwidth dedicated by the decentralised voltage controllers and reactive power management scheme. The CSVC is used to enhance the bus voltage control by utilising the reactive power loading capabilities among distributed energy resources and on-load tap changers of the substation transformer. A comprehensive simulation has verified the superior performance of the proposed coordinated secondary voltage control with the reactive power management scheme for enhancing the voltage profile and the fault ridethrough capability, ensuring higher dynamic reactive power reserves in a distribution network, and improving the transient stability margin.

Online Coordinated Voltage Control in Distribution Systems Subjected to Structural Changes and DG Availability

“…However, it does not address how the impacts of non-simultaneous operations of DG units and voltage regulating devices are minimized. Also, the rule and optimization based strategies proposed in [2], [3], [4], [5], [6] for maximizing DG voltage support and coordinating the voltage regulating devices and DG units do not clearly address how the proposed controls operationally perform for minimizing the impact of DG and voltage regulating device interactions when the distribution systems are subjected to structural changes and DG availability. There may be topology based limitations, which are clearly discussed in [2].…”

Decentralised coordination control strategy of the PV generator, storage battery and hydrogen production unit in islanded AC microgrid

“…As the typical decentralised control method, the droop control needs no dependence on the communication lines and has been applied to approximately realising active power and state-of-charge (SoC) sharing in AC microgrids by regulating the output frequency and voltage amplitude correspondingly [27,28]. The secondary control or improved droop control can compensate for the deviations of the bus frequency and voltage amplitude caused by the conventional droop control with low-band communication according to the requirements of users [29][30][31]. In summary, for one thing, the droop control is mainly used in voltage control mode, which is difficult to apply in RESs because they are controlled at the maximum power point with power control mode.…”

Novel strategy of updating Volt/VAr control set-points for eliminating interactions between different voltage regulating devices and DG units

“…The details of stand-alone VVC methods can be found in (Kersting 2002;Pahwa et al 2014). In (Elkhatib, Shatshat, and Salama 2011;Alobeidli and Moursi 2014;Moursi et al 2014), some of the rule-based controls enabled with or without SCADA are detailed; whereas advanced analytics-based VVC and DMS modeldriven methods can be found in (Akagi et al 2016;Augugliaro et al 2004). In (Ding et al 2016;Yamamoto et al 2014;Malekpour and Niknam 2011), some of the modern optimal VVC methods applicable to balanced and unbalanced distribution systems embedded with distributed generation (DG) are detailed.…”