Based on the energy balance of power system, the mathematical model of energy storage, economic model of power system with energy storage, and the cost function of power system are introduced.

从电力系统的能量平衡入手，介绍了能量存储的数学模型、具有能量存储系统的电力系统经济模型以及电力系统的费用函数。

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The system operator has three main functions : transfer (inter-regional and international transit), process control and balance of the electric power system.

系统操作器有三大主要功能：传送（地区间和国际中转）、程控和电力系统平衡。

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In the power system of reactive power balance layer, to reduce the flow path, reduce the reactive power transmission loss.

电力系统中无功的分层平衡，有利于减少输电路径上无功的流动，降低电网传输损耗。

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Russia says the European missile defense system changes the balance of power and threatens its nuclear arsenal.

VOA: standard.2010.03.26

The balance of power in women's basketball, once a two-party system with Connecticut and Tennessee, had begun to shift recently.

WSJ: University of Connecticut Huskies Back On Top With 93-60 Win Over University of Louisville Cardinals

The biggest problem, however, is that our system was set up to establish one type of balance of power, but we now have a totally different type.

FORBES: Sergey Brin Takes To Google+ To Ask All of Today's Election Winners To Withdraw From Their Political Parties

In Ireland's political system, with its perpetual coalitions, that could mean that Sinn Fein holds the balance of power.

ECONOMIST: North meets South