Page 388 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

Microgrid for High-Surety Power: Architectures, Controls, Protection, and Demonstration 375

t t t t t

t 3 t 3 t 3 t 3 t 3

t 2 t 2 t 2 t 2 t 2
t 1 t 1 t 1 t 1 t 1

0 0 0 0 0
V DC V th P grid P SC P gas P bus

v DC – – – v DC + v DC + v DC –
v dcref /2 + v dcref /2 + + + V th
Supcap volt. control v scref PI PI Bus voltage control – + Reset signal from controller

v – sc + + i vdc – i vdc + Loop switch logic
PI
Supercap v sc – – + PI 0 1 i cha + 0 1 S R
Load v scref i cha – – – Q

L sc L sc
+ i ref –
LPF i ref + Mode control signal
– +
Inverter P sc LPF –
PI
PI
d – PWM
DC bus PWM d +

–
Bypass + V DC

P gas Cold start control diagram of gas engine.

P grid

Gas engine Fuel cell Li-ion battery PV panel
Grid H 2 O 2 FIGURE 14.20