Conventional cyber-security intrusion detection systems monitor network traffic for malicious activity and indications that an adversary has gained access to the system. The approach discussed here expands the idea of a traditional intrusion detection system within electrical power systems, specifically power distribution networks, by monitoring the physical behavior of the grid. This is achieved through the use of high-rate distribution Phasor Measurement Units (PMUs), alongside SCADA packets analysis, for the purpose of monitoring the behavior of discrete control devices. In this work we present a set of algorithms for passively learning the control logic of voltage regulators and switched capacitor banks. Upon detection of an abnormal operation, the operator is alerted and further action can be taken. The proposed learning algorithms are validated on both simulated data and on measured PMU data from a utility pilot deployment site.

1 aRoberts, Ciaran1 aScaglione, Anna1 aJamei, Mahdi1 aGentz, Reinhard1 aPeisert, Sean1 aStewart, Emma, M.1 aMcParland, Chuck1 aMcEachern, Alex1 aArnold, Daniel, B. uhttps://gridintegration.lbl.gov/publications/learning-behavior-distribution-system01499nas a2200193 4500008004100000022001400041245007200055210006900127260001200196300001600208490000700224520088100231100002101112700001801133700002001151700002401171700002301195856008701218 2020 eng d a0885-895000aLossy DistFlow Formulation for Single and Multiphase Radial Feeders0 aLossy DistFlow Formulation for Single and Multiphase Radial Feed c11/2019 a1758 - 17680 v353 aA line loss approximation via parametrization is developed to improve performance of the simplified Baran and Wu DistFlow method, while maintaining a linear set of equations. The approach is evaluated on thousands of training feeders that are created to determine a numerically optimal setting for the parameterization. Feeders are generated using recent advances in synthetic network test case generation. The problem is formulated with the same structure as the simplified DistFlow, yet is more accurate given that line losses are explicitly expressed and quantified. The single-phase methodology is extended to multiphase systems by formulating matrix-vector equations that maintain an analogy to their single-phase counterpart. Results with approximated line losses are shown to also improve the accuracy of multiphase distribution system calculations.

1 aSchweitzer, Eran1 aSaha, Shammya1 aScaglione, Anna1 aJohnson, Nathan, G.1 aArnold, Daniel, B. uhttps://gridintegration.lbl.gov/publications/lossy-distflow-formulation-single-and