Optimal voltage control using singular value decomposition of fast decoupled load flow jacobian
For power system operators, this provides a computationally efficient approach to voltage regulation, though it is an incremental improvement over existing decoupled control methods.
The paper presents an optimal voltage control method that uses singular value decomposition of the fast decoupled load flow Jacobian to maximize the effect of reactive power compensation on voltage magnitudes. Tested on IEEE 9, 14, and 30 bus systems, the method effectively determines new voltage set-points for PV buses.
The problem of regulating voltages within the required limits is complicated by the fact that power system supplies power to a vast number of loads and is fed from many generating units. As loads vary, reactive power requirements of the transmission system vary. Moreover, voltage magnitude is relatively less sensitive to active power compared to reactive power due to high X/R ratio of transmission lines. Therefore, separating voltage control from active power is not only justified but also the common and practical way in power transmission systems. Considering these facts, the fast decoupled power flow jacobian can be used to control voltage magnitudes by reactive power compensation. In this paper, an optimal voltage control is presented to obtain new voltage set-points for PV buses by maximizing the effect of input change on output change using the Fast Decoupled Load Flow (FDLF) jacobian matrix. The proposed algorithm was tested on three IEEE systems: 9 bus, 14 bus and 30 bus systems.