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A constant reactive power (Q) reserve (CQR) is measured by the difference between the maximum reactive power generation and its current. However, all reactive power sources must not affect the entire power system when severe contingencies occur. Thus, generators must be evaluated as to whether or not they will have an impact on the maximum permissible loading of buses. This definition considers some...
Voltage instability usually occurs when the power systems are heavily stressed. In addition, the voltage instability is associated with not meeting the reactive power demands because of limitations on the production and transmission of reactive power. It may or may not be initiated by a disruption, but is usually characterized by shortage of fast-acting reactive power reserves. Reactive power reserves...
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