Electric vehicle charging pile control system and method considering grid frequency safety

A method for controlling an electric vehicle charging pile control system,

• wherein the electric vehicle charging pile control system comprises a grid single-phase power input port, a voltage transformer, a AD conversion chip, a first data processor, a second data processor, a data real-time display device, a GPS or Beidou signal receiver and a man-machine interaction device, and wherein the grid single-phase power input port, the voltage transformer, the AD conversion chip, the first data processor and the second data processor are connected successively;
• the first data processor is further connected with the data real-time display device and the GPS or Beidou signal receiver respectively;
• the second data processor communicates with an electric vehicle charging pile and an electric vehicle battery pack respectively;
• and the second data processor is further connected with the man-machine interaction device,
• the method comprising:
• (1) converting a grid alternating-current voltage signal into a digital signal and storing the digital signal in the AD conversion chip, thus accomplishing sampling of voltage;
• (2) reading voltage sampling data and current geographic information data, calculating the frequency of voltage based on the voltage sampling data and displaying the frequency of voltage using the first data processor;
• (3) superimposing the frequency data onto the current geographic information data and then sending the superimposed data to the second data processor;
• and
• (4) reading the frequency data of the first data processor, the geographic information data and the electric quantity data of the electric vehicle battery pack using the second data processor, and sending a power control signal to the charging pile according to a charging pile output power control strategy to adjust the output power of the charging pile in real time.