Comments (3)
Which parameters are they trying to obfuscate?
[Ming]: The power flows f in the optimal OPF solution (see (3b)). Then, g and u need to be adjusted accordingly using (3a) and (3c).
Which data do they need? Is it the same?
[Ming]: The authors used impedance z = r + jx, while in our program we used y = g + jb.
Gaussian vs Lapacian? What are the implications?
[Ming]: Gaussian implies a slightly relaxed version of differential privacy. The impact on implementation is minimum since it is just an alternative distribution for noise.
Shunt admittance obfuscated?
[Ming]: It does not seem to be obfuscated. See (3c).
Methodology? How does it compare?
[Ming]: For a fair comparison, I suppose we should use the same form of noise for both methods and choose the same privacy budget parameters. Then we can compare utility in terms of operating cost.
from powermodelsprivacypreserving.jl.
It is more different than this (re comments above, I think) -- distribution low-voltage customer, power flows and power outputs, rather than transmission side admittance. I think shunt admittance is implicitly obfuscated. It is very different, and Gaussian required therein due to affine requirement (and no post-processing therein needed)
from powermodelsprivacypreserving.jl.
- Which parameters are they trying to obfuscate?
- Power flow, enforces some affine perturbations from the random vector
- Power output
- Voltage magnitude
- Which data do they need? Is it the same?
- Not sure if the data is contained in the branch information or not
- Guassian vs Lapacian? What are the implications?
- Gaussian
- Not sure of the implications exactly, would have smaller tails than Laplace I think
- Shunt admittance obfuscated?
- Not that I can see, shunt not mentioned
- Methodology? How does it compare?
- Quite different methodology. Seems to be more high level, or general just looking really at perturbing the power flow
- CC-OPF Minimises cost of transmission
- ToV-CC-OPF minimises the above plus some weighted standard deviations
- TaV-CC-OPF minimises like CC-OPF plus weighted sum of difference between original standard deviation and resulting standard deviation
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Related Issues (20)
- make sure package can be installed using the package manager HOT 5
- housekeeping todos HOT 1
- extend obfuscation to more components
- extend obfuscation to unbalanced grid models
- scalability analysis, using PG Lib
- define branching strategy, policies for pull request, code review HOT 1
- Agenda for workshop 23 April 2020 HOT 1
- implementation todos towards v0.2 HOT 1
- collect list of relevant papers
- transformer tap/shift anonymisation HOT 1
- make code more amenable to running on different data sets
- add unit tests for the Milestone V 0.2 prototype
- write up a report detailing the implementation
- Agenda for workshop 30 April 2020
- Chance constraints over Guassian and other distributions
- Agenda for meeting 7 May 2020 HOT 1
- Agenda for meeting 14 May 2020
- Write out obfuscate impedance values in mfile
- due to the noise addition, sometimes, b_shunt is negative
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