A Novel Voltage Sensitivity Approach for the Decentralized Control of DG Plants

Abstract

Abstract-Renewable distributed generation (DG) is likely to be actively controlled in future distribution networks to mitigate voltage issues resulting from high penetrations. This requires understanding the corresponding dependencies between voltage magnitudes and DG active/reactive power outputs. One approach to compute these dependencies is to use classical sensitivity methods such as those based on the Jacobian matrix inverse. However, updating the latter involves extensive remote monitoring. This paper presents a novel approach to produce voltage sensitivities applying the Surface Fitting technique on data based solely on the knowledge of network characteristics; making it suitable for decentralized DG control. To assess the benefits, comparisons with classical methods are carried out using the 16-bus UK GDS test network (1-min resolution simulations) considering a decentralized voltage control algorithm that simultaneously caters for the active and reactive power outputs of a single DG plant. The robustness of the proposed approach is also investigated considering changes in network parameters. Finally, the use of coordinated time delays is proposed to cater for multiple DG plants. Comparisons with a centralized optimization demonstrate that the combined use of the proposed voltage sensitivity approach and decentralized control algorithm is an effective and implementable candidate to actively manage renewable DG plants.

Decentralized Voltage Control Strategy of Soft Open Points in Active Distribution Networks Based on Sensitivity Analysis

“…S VQ t,ij ∂V t,i /∂Q t,j denotes voltage-to-reactive-power sensitivity between V t,i and Q t,j . P t,j and Q t,j represent active and reactive power injection at node j in time period t. Specifically, S VP t,ij and S VQ t,ij are calculated for every time period using real-time local measurements of the deviation of nodal voltage magnitude to unit changes in nodal active or reactive power output [27]. Alternatively, if there are µPMUs in the system, the sensitivities can also be estimated via network equivalents with µPMU measurements [17].…”

“…Thus, we choose the end node of the boundary branch as the boundary node of the two neighboring sub-areas in the inter-area coordination. For the boundary node i between sub-area a and b, the local information of the SOP in sub-area b for interacting to sub-area a through boundary node i is calculated according to (27) and (28):…”

Operating-Condition-Based Voltage Control Algorithm of Distributed Energy Storage Systems in Variable Energy Resource Integrated Distribution System

“…(2) However, the above method requires real-time information on all buses of the distribution system to be considered for its time-varying operating conditions. Hence, numerous measurements and communication infrastructures are necessary, but the requirements are highly expensive [23,24]. To obtain voltage sensitivity under the limited measurements, this study proposes a system reduction as shown in Figure 7.…”

A matrix-perturbation-theory-based optimal strategy for small-signal stability analysis of large-scale power grid

“…Ja is the Jacobian matrix in the Newton-Raphson method [29,30] and the derivatives of voltage can be derived by the Jacobian matrix Ja from (5). The derivatives of the voltage amplitude and phase angle can be written as:…”