27 research outputs found
Sensor Placement for Online Fault Diagnosis
Fault diagnosis is the problem of determining a set of faulty system
components that explain discrepancies between observed and expected behavior.
Due to the intrinsic relation between observations and sensors placed on a
system, sensors' fault diagnosis and placement are mutually dependent.
Consequently, it is imperative to solve the fault diagnosis and sensor
placement problems jointly. One approach to modeling systems for fault
diagnosis uses answer set programming (ASP). We present a model-based approach
to sensor placement for active diagnosis using ASP, where the secondary
objective is to reduce the number of sensors used. The proposed method finds
locations for system sensors with around 500 components in a few minutes. To
address larger systems, we propose a notion of modularity such that it is
possible to treat each module as a separate system and solve the sensor
placement problem for each module independently. Additionally, we provide a
fixpoint algorithm for determining the modules of a system
Dynamic Certification for Autonomous Systems
Autonomous systems are often deployed in complex sociotechnical environments,
such as public roads, where they must behave safely and securely. Unlike many
traditionally engineered systems, autonomous systems are expected to behave
predictably in varying "open world" environmental contexts that cannot be fully
specified formally. As a result, assurance about autonomous systems requires us
to develop new certification methods and mathematical tools that can bound the
uncertainty engendered by these diverse deployment scenarios, rather than
relying on static tools
AC-feasible Local Flexibility Market with Continuous Trading
This paper proposes a novel continuous Local Flexibility Market where active
power flexibility located in the distribution system can be traded. The market
design engages the Market Operator, the Distribution System Operator and Market
Participants with dispatchable assets. The proposed market operates in a single
distribution system and considers network constraints via AC network
sensitivities, calculated at an initial network operating point. Trading is
possible when AC network constraints are respected and when anticipated network
violations are alleviated or resolved. The implementation allows for partial
bid matching and is computationally light, therefore, suitable for continuous
trading applications. The proposed design is thoroughly described and is
demonstrated in a test distribution system. It is shown that active power
trading in the proposed market design can lead to resolution of line overloads.Comment: In proceedings of the 11th Bulk Power Systems Dynamics and Control
Symposium (IREP 2022), July 25-30, 2022, Banff, Canad