Abstract
This paper shows that a relation can be found between the voltage at the terminals of an inverter-interfaced Renewable Energy Source RES and its optimal reactive power support. This relationship, known as Volt-Var Curve VVC, enables the decentral operation of RES for Active Voltage Management (AVM). In this paper, the decentralized AVM technique is modified to consider the effects of the realistic operational constraints of RES. The AVM technique capitalizes on the reactive power support capabilities of inverters to achieve the desired objective in unbalanced active Low-Voltage Distribution Systems LVDSs. However, as the results show, this AVM technique fails to satisfy the operator objective when the network structure dynamically changes. By updating the VVCs according to the system configuration and components availability, the objective functions will be significantly improved, and the AVM method remains resilient against the network changes. To keep the decentralized structure, the impedance identification capability of inverters is used to find the system configuration locally. Adaptive VVCs enable the decentralized control of inverters in an online setting. A real-life suburban residential LV-DS in Dublin, Ireland is used to showcasing the proposed method, and the effectiveness of proposed resilient active voltage management technique is demonstrated.
Highlights
The integration of Renewable Energy Sources (RESs) into the Low Voltage Distribution Systems (LVDS) have many positive effects if they are controlled efficiently, some negative impacts have been reported in the literature [1] for these and other Inverter-Interfaced Controllable Devices (IICDs)
The basic foundations of the decentralized Active Voltage Management (AVM) algorithm based on [13] and the practical limitations that should be considered in the operation of IICDs are discussed
In application mode, the IICDs are tasked with following the assigned Volt‐Var Curve (VVC) to find the change in their reactive power support according to the measured voltages at regarding Point of Common Coupling (PCC)
Summary
The integration of Renewable Energy Sources (RESs) into the Low Voltage Distribution Systems (LVDS) have many positive effects if they are controlled efficiently, some negative impacts have been reported in the literature [1] for these and other Inverter-Interfaced Controllable Devices (IICDs). A fully decentralized technique was proposed in [13] for optimal scheduling of reactive supports provided by IICDs in a LVDSs. The objective could be minimizing the voltage unbalance, energy loss or voltage deviation. In the step, for each scenarios, another optimization is conducted to find the optimal adjustment in the reactive power support provided by the IICDs. The decentralized control can be realized by finding a linearized relationship between the voltage measured at PCC and the optimal value of the reactive power support adjustment. The decentralized control can be realized by finding a linearized relationship between the voltage measured at PCC and the optimal value of the reactive power support adjustment This line is called Volt-Var curve (VVC). An AVM algorithm to consider the effects of the system configuration and components’ availability is presented in Section The results of the .3 to 4 offline and online studies are presented in Section The .validate the effectiveness of the proposed AVM method concluding remarks are presented in Section 5 based on these results
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