）采用了先进的移相控制技术和软起动技术，使工作更可靠。 1 ) Adopt advanced phase shift control technology and soft start technology to make the work more reliable.
）采用美国德州仪器TI公司DSP数字微处理芯片为电源控制核心， PWM控制技术，控制系统性能增强。 2 ) Adopt DSP digital micro-processing chip of Texas Instruments, Inc. as the core of power control, PWM control technology, and enhanced control system performance.
）人机对话的显示界面，可通过触摸屏选择显示工作频率及电流、输出脉冲的占空比、电流等，并可显示故障状态，使显示更直观，更易于操作。 3 ) The display interface of man-machine dialogue can select the working frequency and current, the output pulse duty cycle, current, etc., and display the fault status through the touch screen, making the display more intuitive and easier to operate.
）输出部分采用环形中频变压器，用于隔离输入、输出电压，同时经电容组与控制柜输出相连接，起到隔直作用，防止由于直流偏磁或过励磁产生的磁饱和，同时可起到串联谐振的作用。 4 ) The output part uses a ring-shaped intermediate frequency transformer to isolate the input and output voltages. At the same time, it is connected to the output of the control cabinet through a capacitor group to play a role of blocking the DC to prevent magnetic saturation due to DC bias or overexcitation. To series resonance. The intermediate frequency transformer has a high working frequency, has very low energy loss, and improves the efficiency of the whole machine. If the frequency is increased, the volume can be made smaller and the work efficiency will be higher.
）保护功能齐全。 5 ) Complete protection functions.
Over-current, short-circuit, over-temperature and over- and under-voltage protection are provided, which have more complete functions and more reliable work, avoiding damage caused by various abnormal factors.
应用效果 4. Application effect
In the Shengli Oilfield and Liaohe Oilfield, several medium-frequency power heating technologies have been successfully applied in the areas where several heavy oil wells are distributed. 左右，比工频提高了10倍，根据功率调整电流，一般75kW的电源输出电流在80A左右， 93kW的电源在100A左右，通过中频变压器，输出电压800V左右（输出电压可调整），其加热和节能等应用效果十分明显： Through on-site adjustment, combined with heating cables and power, the frequency is generally adjusted to about 500Hz-1000Hz , which is 10 times higher than the power frequency. According to the power adjustment current, the output current of a 75kW power supply is generally around 80A , and a 93kW power supply is about 100A With an intermediate frequency transformer, the output voltage is about 800V (the output voltage can be adjusted), and its application effects such as heating and energy saving are very obvious:
）功率因数明显提高。 1 ) The power factor is significantly improved. 左右，而用变频电源加热，经测试都在0.95以上。 The original power frequency heating, the power factor is about 0.7 , and heating with a variable frequency power supply, after testing, are all above 0.95 .
）减少了对电网的污染。 2 ) Reduced pollution to the power grid. The original power frequency heating requires three-phase to two-phase, which causes a serious imbalance in the three-phase voltage of the transformer input and serious pollution to the power grid. , 逆变输出可调节的单相交流电 , 实现了三相输人电流的平衡，无需增加配电变压器的容量，可与抽油机共用一台三相变压器。 Because the oil pipe variable frequency heating power source uses AC-DC-AC inverter system circuit, power electronics are applied , and the inverter output is adjustable for single-phase AC power , which realizes the balance of three-phase input current without increasing the capacity of the distribution transformer A three-phase transformer can be shared with the pumping unit. The power factor is increased, and the harmonic content is significantly reduced, which reduces the pollution to the power grid.
）加热效果明显。 3 ) The heating effect is obvious. According to the skin effect, after the frequency is increased, the energy obtained by the load is increased, and the line loss is correspondingly reduced, thereby improving the heating effect. — 2小时达到预定效果，而且温度也要高。 According to tests, frequency conversion heating can achieve the desired effect 1-2 hours earlier than power frequency heating, and the temperature is also higher.
）保护功能齐全。 4 ) Complete protection functions. The original power frequency power supply cabinet has poor protection functions, and often the transformer is burned out and the work is unstable due to the short circuit, disconnection and unstable voltage of the load. 的控制，其保护功能齐全，避免了由于电网及负载的故障引起的问题。 And because of the control of DSP , the inverter power supply cabinet has complete protection functions, which avoids the problems caused by the failure of the power grid and the load. Ensure the stable operation of the system.
）节能效果明显。 5 ) The energy saving effect is obvious. 左右，有力的节约了电能，提高了工作效率，保证了加热系统的效果。 According to tests, each IF power cabinet saves about 20% of power compared to the corresponding industrial frequency cabinet, which effectively saves power, improves work efficiency, and ensures the effectiveness of the heating system.
Frequency conversion heating is a revolution in the thermal recovery of heavy oil. China's heavy oil resources are quite abundant. The promotion of this technology is an effective way to improve energy efficiency and reduce emissions in the oil recovery industry.