According to the parameters provided by project, the project needs to configure ± 7.5MVar reactive power compensation capacity, iSVG device can achieve continuous rapid adjustment from inductive reactive power to capacitive reactive power range of -7.5 ~ 7.5MVar, the final choice of iSVG-7M5-10 -CT can meet the project requirements. Soalr station main circuit primary system diagram is shown in Figure 2.
Figure 2 Soalr station primary system diagram
iSVG is required to access the solar station integrated automation platform to meet the requirements for dispatch center remote control and remote adjustment. Automation platform and iSVG communication standard adopt standard MODBUS communication protocol to achieve the voltage, current, power unit status information detection of iSVG device via the background, realizing remote adjustment device reactive or voltage control objectives, as shown in Figure 3.
Figure 3 The realization of iSVG automation control
ISVG device takes 35kV bus voltage as the control target, and real-time tracks grid voltage changes and reactive power changes, according to changes demands, dynamically adjust the device reactive power output. Huancui mountain solar power station takes controlling voltage command as the control target, requires the total discharge voltage of soalr station to follow the scheduling voltage command changes. After adding the iSVG series high-voltage static reactive power generator, the grid voltage is effectively controlled, from the voltage curve shown in Figure 3, we can see that iSVG real-time tracks the given target voltage to adjust the grid voltage and meet the control requirements.
Figure 4 Solar station voltage adjustment curve