As the traditional power flow tracing method is based on the active and reactive power decoupled method , the results obtained by this method is not precision 在输电成本分摊方面，本文首先指出建立在有功功率与无功功率解耦追踪的基础上的传统潮流追踪方法的不合理性。
When the generator excitation has been changed , the reactive power could be variation and the active power could be rebuild in the main generator and subsidiary generator 在副发电机或主发电机励磁发生变化时，不但会使机组的无功发生变化，而且会在主、副发电机之间发生有功功率的重新分配。
It will not only consume active power , but also absorb more reactive power . lastly , it can results in lowering power factor ( cos ~ ( ) ) , and also damaging the quality of low voltage power ' s net 在电力负荷中，有很大一部份是感性负荷，它不仅消耗有功功率也吸收很多无功功率，造成功率因数下降，降低供电质量和供电能力。
That is using reactive info to regulate the amplitude of voltage to achieve reactive power equilibrium and using active info to regulate the phase of the voltage to achieve active power equilibrium 并联各单元输出无功功率进行综合后，对各单元输出电压幅值进行调节；对输出有功功率，仿效电机的有功下垂特性，以实现有功自动均衡。
The agc and avc of hydropower station are very important and complex softwares that control hydropower station in providing power to electric system , and play an important role in ensuring the quality of electric energy 水电站厂内agc 、 avc是控制电站向电力系统提供有功功率和无功功率的重要软件，对保证电能质量起到至关重要的作用。
Note1 : double screen display ; high screen display tri - phase total active power , scope 0 9999 . 9 ; lower screen display tri - phase total active electric energy value active power accumulation value , scope 09999999999999 注1 ：双屏显示，上屏显示三相总有功功率,范围0 9999 . 9 ;下屏显示三相总有功电能值有功功率累积值,范围0 9999999999999 。
Reactive power and voltage control in the distribution systems is very important . it makes the running of the systems more safe and stable and economical . it can also decrease the real power loss and improve the voltage 在配电系统中进行无功电压控制能够有效地降低有功功率损耗、改善电压水平，对系统的安全稳定经济运行具有重要意义。
According to traditional power triangle ( the square of the active power , reactive power and apparent power form the relation of the right triangles ) , put forward a new electrician ' s theories of power quadrangle 基于传统的功率三角形(即有功功率，无功功率，和视在功率三者的平方成直角三角形的关系) ，提出了功率四边形这种新的电工理论。
The optimal - aim strategy ( oas ) is used to decide the controller ' s input variables , i . e . the modulated active and reactive power which can be determined according to the practical operating conditions of ac system and operating states of dc system 该方法利用最优目标策略（ optimal aimstrategy ，简记为oas八来得出有功功率的调制量，它是系统状态的解析函数。
The algorithm of economic power dispatch , which considers the constraint condition of network loss and frequency variation , is studied , and a pragmatic and effective method of frequency control is put forward , and the marginal cost is analyzed 本文研究了计及网损和频率变化率约束条件的有功功率经济分配的算法，提出了一种实用有效的频率控制方法并对边际成本进行了分析。
