电力论文（Power papers）.docVIP

电力论文（Power papers） Abstract: voltage is an important index of power quality. The voltage is too high or too low, which will cause serious harm to power grid and users. With the development of society, the demand for power quality is becoming higher and higher. The necessity of voltage regulation, voltage adjustment measures and voltage adjustment methods are discussed in order to serve the social development better. Keywords: voltage regulation; power system; power quality I. the necessity of voltage regulation in power system Voltage is an important indicator of the quality of power, voltage failure will cause serious harm to the power grid. Voltage offset is too large, it will affect the quality of industrial and agricultural production and output, damage to power equipment, and even cause systemic voltage collapse, resulting in large power outages. 1., the network voltage is low (1) the reason of the low voltage of the grid. Due to the unreasonable design of the power supply network or the power distribution network, especially the transmission distance of some lines is long, the power supply radius is big, the cross section of the conductor is small, and the voltage loss of the line is greater. Reactive power supply of power grid is short of or reactive power compensation, equipment management is poor, long-term disrepair, often disabled, and so on, so that the reactive power balance is destroyed, which is the basic reason for the general reduction of the voltage level of the grid. Transformer substation transformer junction position is not reasonable, the power network connection is unreasonable, overload, low load power factor, power equipment overhaul and line fault, etc., can make the network voltage drop. [1] (2) the harm of the low voltage of the grid. Harm to generator: generator stator current increases with the increase of power angle. Suppose the generator is at normal voltage, the stator current is the rated value. If the system voltage is reduced, th