Dr. Jingran Wang

Jibei Electric Power Dispatch and Control Centre

State Grid Corporation of China

2018.10

新能源并网技术要求 2

新能源消纳全过程评估 3

国家电网公司概况

Overview of SGCC

RE integration technical requirements

Whole-process assessment on RE accommodation

1

1. Overview of SGCC

SGCC’s core business is to build and operate power grids in China

The service area covers 26 of 32 provinces, taking 88% of China’s

territory. SGCC is the biggest utility company worldwide

The total installed capacity had reached 1,379GW by the end of 2017

Wind: 129GW (9.3%); Solar: 115GW (8.3%)

火电, 88887,

64.5%

水电, 22414,

16.3%

风电, 12890,

9.3%

太阳能, 11506,

8.3%

核电, 2176,

1.6%

2. Integration technical requirements

In 2011 and 2012, 10 times of power grid faults occurred in some

provinces, which results in 5,087 wind turbines tripping due to lack of

LVRT capability

Revised two national standards: Technical rule for connecting wind

farm and photovoltaic power station to power system

By the end of 2015, completed a total of 200 types of wind turbine

testing of LVRT capability

246

598

400

677 644

1278

790 814

660 584

103

837

568

976

854

1535

1016 1055

876

737

0

200

400

600

800

1000

1200

1400

1600

1800

2011.1.30 2011.2.24 2011.4.3 2011.4.17 2011.4.17 2011.4.25 2011.11.16 2011.12.21 2012.3.30 2012.5.14

脱网风机台数

损失出力MW

Jilin

Gansu

2012 脱网1244台次 损失1613MW

Gansu

Gansu

Gansu

Jibei

Jibei Jibei

Jibei

Jibei

2011 脱网3843台次 损失4873MW

Number of wind turbine tripping

Loss of power (MW)

The transient overvoltage of power

grid reached 1.2 or 1.3 times of the

rated voltage

Large number of wind turbines tripped

at the sending region of UHV DC lines

when phase changing failure

In 2016, choose some wind farms in

Mengdong area as pilots to carry out

the capability improvement of high

voltage ride through (HVRT)

Simulation results of Hami-Zhengzhou UHV line

phase changing failure Simulation results of Zhalute-Qingzhou UHV line

phase changing failure

LVRT Improvement Cost

(thousand yuan) HVRT Improvement

Cost (thousand yuan)

UPS 5, (3.8%) UPS —

Control system logic 10, (7.7%) Control system logic —

Converter testing and control

50, (38.5%) Converter testing and

control —

Converter protection circuit

45, (34.6%) Converter protection

circuit —

Converter LVRT control strategy

20, (15.4%) Converter HVRT control

strategy 20,(100%)

Total 130 Total 20

Cost of LVRT and HVRT Improvement of wind turbine

测试点电压

(p

u)

时间(s)

0 1 2 3 9

1.00

1.10

1.20

1.30

0.2

电压水平

要求风电机组

不脱网连续运行

风电机组

可以切出

10…… 11

High voltage ride through curve of

wind turbine HVRT requirements

Wind turbine: 1.3Un, 200ms

PV inverter: 1.3Un, 500ms

Frequency tolerance requirements

51.5Hz

Revising the standards for HVRT

?% ?%

outage

maintenance

passive

maintenance interface

peak-valley

theoretical generation real generation Inner-plant curtailment Outer-plant curtailment

outage

RE Utilization Level

100% 82% 8% 10%

3. Whole-process Assessment on RE accommodation

Many factors influence renewable generation utilization level: wind and

solar resources, equipment reliability, grid operation constraints, and

priority dispatching

The purpose of whole-process assessment is to analyze the influence

of each factor quantitatively

Basic Principle

Establish the mapping relationship between active

power and nacelle wind speed for each turbine

Calculate the theoretical power when curtailment

occurs

Integrate the theoretical power to get the theoretic

generation during one period

Calculate components of inner-plant and outer-plant

curtailment

Calculation of theoretical generation

0

5

10

15

20

25

30

Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Ene

rgy

curt

ailm

en

t (G

Wh

)

inner-plant outer-plant

Components of iner-plant and

outer-plant curtaiment Calculation of curtailment energy

for one wind farm

Dr. Jingran Wang

Senior supervisor of Jibei Electric Power Dispatch and Control

Centre, State Grid Corporation of China. Main research field

includes power system planning and renewable energy

dispatching.

TEL: +86-13810751782,

EMAIL: jingranwang@126.com

More than 80% of the power demand is distributed in astern and southern

areas in China. By contrast, renewable energy is mainly in the ‘3-North’

area.

欧美陆上风电 市场需求导向 靠近负荷中心 小规模 多业主 高度分散

中国陆上风电 资源导向 远离负荷中心 大规模 少业主 高度集中

Comparison of renewable energy development between China and Europe

Europe and US

Market demand oriented

Near the load

Small-scale

Many owners

Highly dispersive

China Resource oriented Far from the

load

Large-Scale

A few owners

Highly centralized

中外新能源发展特点对比 The development characteristic comparison

The average capacity of wind farm in China is 88MW(3 times of

Spain),and the largest one exceeds 400MW. Many wind farms in the

region with good wind resources are integrated into the same substation,

thus forming wind farm cluster (2-3GW). And then many wind farm

clusters are integrated into higher-voltage level substation, forming a wind

power base (10GW).

Testing Contents Testing Requirements

Mandatory

Wind farm active/reactive

power control capability

Whether AGC/AVC substation meets the

operating conditions accessing to the main

station

Wind farm Power quality Whether wind power quality meets the

standard requirements

Wind farm low voltage

ride through capacity and

grid adaptive capacity

verification

To ensure that the wind turbines are consistent

with the testing unit parameters and

configuration, and wind farms low voltage ride

through capacity and grid adaptive capacity

Dynamic reactive power

compensation device

performance test

The reactive power compensation device

should have reactive power regulation and

voltage control capability

Detection of reactive power compensation

device performance whether meet the standard

requirements, for dynamic control performance

optimization of reactive power compensation

device to provide test data.

Optional Wind turbines power

characteristics test

Consistency of Wind turbines actual power

curve inspection and theory power curve

Integration testing requirements

Signal data Telemetry

data

wind turbine

Operatin

g

Generation

real power,

reactive power,

nacelle wind

speed

Idle with low wind velocity

Deregulated generation of dispatch

Shutdow

n

Shutdown reserve from AGC

Schedule maintenance

Non-planed outage (inside)

Non-planed outage (outside)

PV inverter

Operatin

g

Generation

real power,

reactive

power

Deregulated generation of

dispatch

Shutdow

n similar with wind turbine

anemometer

tower wind speed (10m, 30m,50m,70m) 12

Remote telemetry and signal data

The component analysis of energy curtailment is based on high-quality operation information of each wind turbine and PV inverter

2018/10/22

The impact of wind turbine component outage

on wind curtailment

Wind farms in different

geographical locations

Power generation companies

Equipment manufacturers

Assessment of wind power utilization