At present, the start of large-scale synchronous units is generally adopted by SFC control. SFC has become the standard configuration for variable frequency start-up of pumped storage units. The domestic variable-frequency starters of pumped storage units all use foreign products, resulting in high investment costs and difficulties in maintenance and renewal. The key technology and difficulty in breaking through SFC products is to break the monopoly of SFC products of foreign companies. Realize the localization of 10 MW class large capacity inverter. The controller is the heart of the SFC control system. In recent years, with the development of computer technology, high-speed processing chips have emerged, enabling people to use a digital signal processor (DSP) with high-speed computing power as the core, and a field-programmable gate array (FPGA) as an interface-controlled dual CPU. Design Patterns. The SFC main circuit topology is shown in Figure 1. The system mainly includes a grid side rectifier bridge, a smoothing reactor, a machine side inverter bridge, a high power synchronous motor and an excitation rectifier. The SFC is an "AC/DC/AC" current source type, the rectifier rectifies the alternating current into a direct current, the inverter inverts the direct current into a frequency-adjustable alternating current, and the intermediate smoothing reactor is used for the smoothing of the rectifier output. Decoupling makes the DC current waveform of the main circuit of the inverter straight and pulsating, and has current source characteristics. The basic working principle is: the control system controls the thyristor static frequency conversion device to perform frequency conversion speed regulation on the synchronous motor according to the motor speed and position signal, thereby generating a variable frequency power supply from zero to the rated frequency value, and synchronously dragging the unit. Due to the particularity of the variable frequency start-up of the pumped storage unit, the start-up acceleration process is generally divided into two stages: “pulse commutation†operation and “natural commutation†operation. Laptops,windows Laptops,win11 Laptops,win10 Laptops Jingjiang Gisen Technology Co.,Ltd , https://www.gisengroup.com
Here, the principle of starting control of pumped storage unit is briefly introduced, and the design of the controller is elaborated. After the actual operation of the Panjiakou Pumped Storage Power Station, the effectiveness and stability of the control system design was verified. 
From Figure 1 and the synchronous motor model: