A condition that occurs in an electric power system when the total real or reactive power of the power plants in the system is insufficient to supply all consumers with electric power of the required quality.
A shortage of real power can result in a lowering of frequency throughout the power system and can ultimately lead to a breakdown condition. The breakdown condition can be prevented by connecting additional (spare) generators to the system or by disconnecting some of the consumers. A shortage of reactive power causes a voltage drop in the system. In extreme cases a so-called voltage avalanche can develop, resulting in emergency disconnection of all consumers. A voltage avalanche is best prevented by boosting or regulation of the excitation of the generators and synchronous compensators connected to the system, as well as by proper selection of the compensating equipment used in the system.
Will There Be Power?
Who remembers when you got into your car, turned on the radio and let it warm up? Back in those days' radios had tubes in them and instant on was only a dream. Today we have global positioning systems, satellite radio and Onstar. The only thing that stays the same is that things change. Look at how much cars have changed in the past fifty years. We have computer controlled engines, computer controlled transmissions and computers that make individual climate changes for you and your passengers.
But one thing hasn't changed much. That is the charging system and batteries. The last time the charging system and batteries changed was in the mid-50s when cars went from a 6-volt system to a 12-volt system. The last domestic carmaker to switch to the 12-volt system was Ford in 1955. Volkswagen went to 12 volts a few years later.
There are so many demands on the electrical system and with what is planned for the near future, the electrical system is barely holding it's own. It is estimated that in the near future there will be over 300 sensors built