Systems and methods for global voltage security assessment in power systems

A power system, comprising:

• a power source;
• a power consuming load;
• a power grid operatively coupling the power source to the power consuming load;
• a plurality of phasor measurement units operatively coupled to the power source, the power consuming load, and/or the power grid, the phasor measurement units being configured to collect a plurality of phasor measurements from the power source, the power consuming load, and/or the power grid;
• and
• a processor operatively coupled to the plurality of phasor measurement units, the processor having a non-transitory computer readable medium containing codes for performing a method comprising:
• capturing a change in bus voltage and a change in line reactive power for at least one of the buses in the power system;
• for each of the i number of buses, calculating a voltage assessment index (Γi) for as follows:
• Γ
• i
• =
• ∑
• j
• ⁢
• Δ
• ⁢
• ⁢
• Q
• ij
• Δ
• ⁢
• ⁢
• V
• i
• where ΔVi is the change in bus voltage and ΔQij is the change in line reactive power from a connection j over a predetermined period of time;
• and
• assessing a current voltage security status of the at least one of the i number of buses and/or the power system based on the calculated voltage assessment index (Γi).

A computer system for assessing voltage security in a power system, comprising:

• a processor;
• and
• a non-transitory computer readable medium operatively coupled to the processor, the non-transitory computer readable medium containing codes for performing a method comprising:
• capturing a change in bus voltage and a change in line reactive power for at least some of the buses in the power system;
• for at least one of the i number of buses, calculating a voltage assessment index (Γi) for as follows:
• Γ
• i
• =
• ∑
• j
• ⁢
• Δ
• ⁢
• ⁢
• Q
• ij
• Δ
• ⁢
• ⁢
• V
• i
• where ΔVi is the change in bus voltage and ΔQij is the change in line reactive power from a connection j over a predetermined period of time;
• and
• assessing a current voltage security status of the at least one of the i number of buses and/or the power system based on the calculated voltage assessment index (Γi).