Please read the NEW documentation for the 3-phase PLL sketch (posted here yesterday) regarding the serial data baud rate problem in the emonESP software.
It is near the middle of page 3:
"2. The baud rate for serial communications must not be set to a value greater than 9600. (For the ESP8266 module, change Line 41 or thereabouts in the ESP8266 file “src.ino”.)