BSI’s Real-Time Voltage Stability

As actual system conditions become more severe and load demand in the system increases, system operators require a powerful tool to evaluate voltage security of the system based on the ebb and flow of actual system operating conditions. BSI’s Real-Time Voltage Stability Analysis and Enhancement integrated software package, is a keystone tool for maintaining the reliability of your bulk power transmission system.

Indeed, increasing real and reactive load demand, net power interchange, and/or a configuration change (contingency) can result in voltage collapse. VSA&E analysis and control recommendations provide the system operators a quantitative view of where voltage problems lie ahead, the proximity of the system operating point to the problem and what operations can be taken to steer the system into highly secure operation regions.

VSA&E includes contingency selection and screening, which provides a list of the most severe contingencies, in terms of voltage stability margins, from a full, comprehensive contingency list. The VSA&E load margin calculation determines the voltage stability margin in megawatts (MW) and megavar (MVAR), between the voltage collapse point and the current power system operation point. The VSA&E package also provides the operators and reliability engineers look-ahead analysis, enhancement control and preventive control along with the load margin and sensitivity information with respect to voltage collapse , voltage violation and thermal limit violation.

Using the companion BSI package, Study VSA&E, in combination with Real-Time VSA&E, you can achieve seamless coordination of planning and operational activities. BSI clients , in their study of systems ranging from 1,000-bus power systems to 50,000-bus power systems, have experienced highly beneficial results in both operational and planning applications of VSA&E.

Preventive Control

The VSA&E voltage stability capability secures safe voltage stability load margins by using controls such as: (1) reactive power-compensating devices, (2) ULTC, (3) phase-shifters, (4) real generations, (5) generator terminal voltage and (6) load-shedding by location and load amount.

Table: VSA&E identifies Preventive Control to mitigate the 4 insecure contingencies so that after the 5 controls are executed all will have positive load margins and all satisfy their physical limits.

The Preventive Control Table above shows the output of Preventive Control processing by VSA&E. The 5 recommended control actions shown in the table when taken will mitigate all 4 insecure contingencies identified by the Contingency Ranking Analysis, see Table 1 above. The load margins of the 4 insecure contingencies, which are zero or negative before the preventive control, are all raised such that the load margin of all 4 contingencies are increased to the range from 839 MW to 2832 MW after the preventive control.

Enhancement Control

Using the same set of available controls as the preventive control, the enhancement control of VSA&E allows the operator to specify a desired (target) amount in MW of increase in load margin for a contingency or the base case. Enhancement control returns a priority-based, minimum set of control actions to execute the desired load margin increase. Suppose the target load margin increase is 200 MW. VSA&E identifies 4 control actions that meet the target value and satisfies their physical limits. The output table below shows that by executing the 4 recommended control actions the load margin is enhanced by 207 MW increasing the margin from 2710 MW to 2917.

Table: VSA&E Enhancement Control gives control actions to increase the margin

 

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