1、变频节能 变频器节能主要表现在风机、水泵的应用上。为了保证生产的可靠性，各种生产机械在设计配用动力驱动时，都留有一定的富余量。当电机不能在满负荷下运行时，除达到动力驱动要求外，多余的力矩增加了有功功率的消耗，造成电能的浪费。风机、泵类等设备传统的调速方法是通过调节入口或出口的挡板、阀门开度来调节给风量和给水量，其输入功率大，且大量的能源消耗在挡板、阀门的截流过程中。当使用变频调速时，如果流量要求减小，通过降低泵或风机的转速即可满足要求。以上海正艺信息科技有限公司生产的变频器应用到风机水泵型负载的节能的例子来说：一台离心泵电机功率为55千瓦，当转速下降到原转速的4/5时，其耗电量为28.16千瓦，省电48.8％，当转速下降到原转速的l／2时，其耗电量为6.875千瓦，省电87.5％。

1. The energy saving of frequency conversion frequency converter is mainly shown in the application of fan and pump. In order to ensure the reliability of production, all kinds of production machines have a certain amount of surplus when they are designed to drive power. When the motor can not run under full load, in addition to the requirements of the power drive, the excess torque increases the consumption of active power and causes the waste of electric energy. The traditional way of speed regulation for fans and pumps is to regulate the air volume and water supply by adjusting the inlet or outlet baffle and valve opening. The input power is large, and a large amount of energy is consumed in the process of the closure of the baffle and valve. When using frequency conversion speed control, if the flow requirement is reduced, the speed of the pump or fan can be reduced by reducing the speed of the pump or the fan. Shanghai is an art Mdt InfoTech Ltd production of inverter applied to energy-saving fan pump type load for example: centrifugal pump motor power is 55 kilowatts, when the speed dropped to the original speed of 4/5, its power consumption is 28.16 kilowatts, saving 48.8%, when the speed dropped to the original speed of L / 2, the the power consumption of 6.875 kilowatts, saving 87.5%.

2、功率因数补偿节能 无功功率不但增加线损和设备的发热，更主要的是功率因数的降低导致电网有功功率的降低，大量的无功电能消耗在线路当中，设备使用效率低下，浪费严重，使用变频调速装置后，由于变频器内部滤波电容的作用，从而减少了无功损耗，增加了电网的有功功率。

2, power factor, reactive power compensation and energy saving not only increase the heat loss and equipment, more important is to reduce the power factor of the power grid leads to the decrease of active power, reactive power consumption in a large number of lines, low efficiency, serious waste of equipment, the use of variable frequency speed regulation device, the inverter internal filter capacitor effect of reducing reactive power loss, increase the active power grid.

3、软启动节能 电机硬启动对电网造成严重的冲击，而且还会对电网容量要求过高，启动时产生的大电流和震动时对挡板和阀门的损害极大，对设备、管路的使用寿命极为不利。而使用变频节能装置后，利用变频器的软启动功能将使启动电流从零开始，最大值也不超过额定电流，减轻了对电网的冲击和对供电容量的要求，延长了设备和阀门的使用寿命。节省了设备的维护费用。

3, soft start, energy saving motor hard start has a serious impact on the power grid, and it will also have a high demand for the power grid capacity. The large current and vibration caused by the startup will cause great damage to the baffle and valve, and it will be extremely unfavorable for the life of the equipment and pipeline. With the use of frequency conversion energy saving device, the soft starting function of converter will start the current from zero, and the maximum value will not exceed the rated current. It will reduce the impact on the power grid and the power supply capacity, and extend the service life of the equipment and valve. The maintenance cost of the equipment is saved.