IEEE Power & Energy Magazine - May/June 2019 - 92

Installed Mechanical dc CB in Nan'ao
Multiterminal System

1) the main branch is made up of four 40-kV-rated dc
voltage Vis connected in series, which satisfies requirements for meeting system voltage levels and fast
the nan'ao multiterminal hVdc project, with a ±160-kVresponse times. adequate voltage sharing during dyrated dc voltage, was completed by the china Southern power
namic events and static state requirements are achieved
Grid and put into operation at the end of 2013. this projby arming each Vi with a transient grading capacitor
ect includes three converter stations: Sucheng, Jinniu, and
cj, damping resistor rj, and static voltage-sharing reQing'ao. the project collects wind power supplied to Jinniu
sistor R X .
and Qing'ao Stations and sends it to the mainland. the project originally adopted the same method from the Zhoushan
2) the current injection branch is divided into a hV side
project of using ac breakers to interrupt dc faults. with this
and a lV side. these are isolated electrically through
method, the lowest possible power losses were achieved, and
the use of an air-core transformer with mutual induccapital expenses were kept low. however, the project suffered
tance M, where the high coupling factor k allows for
from slow dc fault-clearing times. the project was upgraded
high energy-transfer efficiencies. the air-core design
in 2017, with the installation of three mechanical dc cBs
provides the most efficient method because it accomrated 160 kV (Figure 8).
modates high power transfer at high frequency.
Figure 9 illustrates the topology and shows a photo of the
3) the energy absorber consists of banks of surge arrestinstalled prototype 160-kV mechanical hVdc cB. it consists
ers directly connected to the series connection of the
of the following elements.
four Vis.
Functioning under an operating
principle similar to that described
in the section "mechanical dc cB,"
Sucheng Station
Jinniu Station
200 MW
100 MW
the nan'ao mechanical hVdc cBs
use a combination of inductors and
Cable
precharged capacitors to produce
the current zero through the Vis.
dc
the
difference is that the storage
Breaker
capacitor in this scheme is charged
on the lV side of the cB rather
Overhead Line
than at the hV side. this technical solution charges the storage
capacitor C 1 to the target voltage
by introducing an uninterruptible
50 MW
power system (upS) boost circuit.
Qingao Station
the upS voltage is boosted by the
isolation transformer Tc and then
figure 8. A diagram showing the Nan'ao three-terminal HVdc transmission system
with installed mechanical dc CB.
rectified into a dc voltage through

Energy Absorber
MOV
VI1
Main Branch

Cj

Rj

VI2
Cj

Rx

Rj
Rx

VI3

VI4

Cj Rj

Cj Rj

Rx

Rx

UPS

C2
Current
Injection
Branches

Rc Dc
Tc

L2

HV Side

M

LV Side

L1
C1

SCR

Current
Injection
Branches

Main
Branch
Energy
Absorber

D

(a)

(b)

figure 9. (a) The topology and (b) a prototype of a 160-kV mechanical HVdc CB.
92

ieee power & energy magazine

may/june 2019



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
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