Micro Grid System of Cimei Island, Taiwan

Chao-Shun Chen, Prof.I-Shou University

2019.08.09

2019 Fort Collins Microgrid

1. Population: 3,0002. Land Area: 7kM2

3. Diesel Generators: 4*1000kW4. Three Distribution Feeders(3.3kV)5. System Loading:1700kW/600kW6. Annual Electricity Consumption: 8M kWh7. Taipower Annual Service Loss: $4M

Cimei Island

Status of Renewable Energy on Cimei Island

1. PV System: 400kWp2. Energy Storage System(500kW, 600kWh)3. Wind Generator: 600kW(to be installed by 2019)

Power Generation of Cimei 155KW PV System (2015)

Spring 3/29

Summer 8/6

Autumn 10/3

Winter 12/28

Annual wind speed of Cimei Island (2015)

hour

System Diagram of Cimei Micro Grid

G4

G3

G2

G1RB 01

RB02雙湖饋線

RB03平和饋線

#1 MTR

#2 MTR

#3 MTR

#4 MTR

500 MCM863.5m

1845.9m

500 MCM2050m

#1749m

#1581.1m

#1120m

PV 25.3kWp七美鄉公所

500 MCM

#1235.2m

#11503.7m

#1214m

#1306m

既設PV155kWp

新設PV200kWp

#1123m

#1116.8m

PV30.4kWp

#1305.7m

#1425.4m

#1187.1m

#1102m

#1365.2m

#1503.3m

#1889.5m

#1316.9m

#1289.7m

#1339.3m

#1610m

#1342.1m

#1128.5m

#1105.6m

ESS

南港饋線

儲能系統250KW300KWh

太陽光電發電系統(智慧變流器)

台電七美綠能園區TPC Cimei Green Park

Objectives of Cimei Smart Grid Project

1. Reduce generation cost by high penetration of renewable energy

2. Determine the optimal capacity of PV, WG, Energy Storage System(ESS), and Diesel Generators

3. Execute the Economic Dispatch Control(EDC) of diesel generators according to the forecast of renewable energy

4. Enhance system power quality with coordinating control of diesel generators, PV smart inverters and ESS

5. Support the testing of system operation with zero carbon island

Demonstration of Cimei Smart Micro Grid 1. Intelligent µEMS for system operation and control of PV,

WG, ESS and diesel generators to achieve system servicepower quality.

2. Economic Dispatch Control of diesel generators consideringthe forecasting of system load and renewable energy.

3. Smart charging and discharging of ESS.4. Ensure system transient stability for PV shutdown/generator

tripping by fast power discharge of ESS.5. Enhance system voltage quality by coordinating control of

PV smart inverters, ESS and diesel generators.

Cimei Energy Management System

Green Park Control Center

Cimei Power Plant Control Room

Configuration of Cimei Intelligent µEMS

Schematic Diagram of Intelligent µEMS

PCS PCS PV inverter WG inverter

Customerloads

Distributionstation

Dieselgenerators

Powernetwork

PV panels Windgenerators

Li‐ion(#2 ESS)

Li‐ion(#1 ESS)

Dispatch workstation

AC networkDC network

Communication network

Control Sysem of Renewable Energy and ESS

PV System(355 KWp)

Energy Storage System (Li-On Battery + PCS)

System Network of Cimei Smart Grid

Computer Display of Cimei Intelligent µEMS

ESS(500kW/600kWh，Li-Ion Battery + PCS)，300kWh(fast power discharging 1.3C)，300kWh(slow charging/discharging 0.5C)。

Control Modes a. Transient stability (Fast power discharging with under freq.

trigger)b. RE smoothing (Slow power charging/discharging with

Moving Average Control Algorithm)c. System Peak load shaving (Slow power charging/discharging

considering profiles of system load and RE generation)

Control Strategies of Energy storage System

ESS control architecture of Cimei smart microgrid

PV smart inverter (V-PF, V-P, Freq.-P)

2019/5/10 19

Automatic PV generation control ( frequency-P )(2018.04.16)

System peak load shaving by ESS

System Frequency Response with ESS fast power discharging (60kW-60kW)

22

Transient Frequency Response of Cimei System after Generator DG1 tripping(2018.8.1)

饋線低頻卸載(57.3Hz)

ESS快速放電(370kW)

Smoothing of PV power generation by ESS

Power profiles of PV system and ESS after RE smoothing

Peak shaving of system net load profile by ESS

Power output of Cimei diesel generators for DG2 tripping

Profiles of ESS fast power discharging with UF triggering

Conclusions

1. Development of operation technology for Cimei Smart Grid to ensure service quality and security for micro grid with high penetration of renewable energy.

2. ESS with control strategies has been applied to perform fast power discharging to enhance system transient stability.

3. Power generation fluctuation has been mitigated effectively by ESS.4. Slow power charging/discharging of ESS has improved the system

loading factors considering daily profiles of system loading and RE generation.

5. Business model needs to be derived to achieve system sustainability for micro grid implementation.

Thanks for your attention