Help with economic value of voltage deviation reduction
Help with economic value of voltage deviation reduction
(OP)
Hi all
I'm undertaking an optimization of the transmission network with capacitor bank installation. 2 common objectives are - 1) reduce active power loss, 2) reduce voltage deviation from 1pu (i.e. make buses V close to 1pu).
I want to know the economic benefits for reducing the voltage deviation from 1pu as I need to justify the investment cost.
Thanks.
I'm undertaking an optimization of the transmission network with capacitor bank installation. 2 common objectives are - 1) reduce active power loss, 2) reduce voltage deviation from 1pu (i.e. make buses V close to 1pu).
I want to know the economic benefits for reducing the voltage deviation from 1pu as I need to justify the investment cost.
Thanks.






RE: Help with economic value of voltage deviation reduction
RE: Help with economic value of voltage deviation reduction
Yes i agree with your point. Sorry i should've mentioned there is a third objective - 1) minimizing active losses, 2) minimization of VAR investment (i.e. capacitor banks) and 3) minimizing voltage deviation
The cost of making vars can be minimized with obj(2), while also working on obj(1 and 3). The main problem i'm facing now is to attach a economic (i.e. quantifiable in money terms) value to objective 3 (min voltage deviation).
How can i justify minimization of voltage deviation as an objective??
Thanks.
RE: Help with economic value of voltage deviation reduction
I know people are interested in keeping voltage close to 1pu as it is the rated level and consumer equipments are designed to work at rated levels. But are there any other benefits?
RE: Help with economic value of voltage deviation reduction
For information on how deviating voltage effects equipment, I would recommend referencing the IEEE Red or Gray book. Both have sections outlining the effects voltage deviation has on equipment (motors, lighting, capacitors, solid state equipment, cathode tubes, ect) utilization and life.
RE: Help with economic value of voltage deviation reduction
Unswitched capacitors may not do a whole lot for minimizing hour to hour voltage variation, though they will provide an average voltage increase.
The economic value of switched caps depends partly on the availability of other voltage management tools such as transformers with LTC and generators. Both LTCs and capacitor switches have much higher maintenance costs than fixed devices.
Also note that some caps may be installed as mitigation for line outages. The performance of the cap during contingencies may override the ideal N-1 loss considerations.
Keep in mind that there may be distribution substation transformers with LTC's between the transmission system and the distribution loads. Those LTC's will isolate customer devices from typical voltage variation on the transmission system.
RE: Help with economic value of voltage deviation reduction
Please have a look at this paper - minimization of voltage deviation is one of the objectives. There are many, many other researchers who publish paper with voltage deviation min as core objectives. http://www.sciencedirect.com/science/article/pii/S...
How can i justify investment with the objective of min voltage deviation? I know they help in contingencies, as reactive reserve margin etc, but how do i represent these in economic sense? For example, one way i thought of is that this extra "help" from min voltage deviation will decrease the likelihood of system collapse or blackouts, and i can calculate the expected savings (prob reduction * cost of blackout)?