No 16Nanzhong RdChangping DistrictBeijing 102200P.R.China

For further informationTel: +86-10-66601712Fax: +86-10-66601700Email: info@cepri.com.cnwww.cepri.com.cn

C-EPRI Electric Power Engineering Co., Ltd.

Shape up power grids of tomorrow

南瑞集团中电普瑞电力工程有限公司

南瑞集团中电普瑞电力工程有限公司

Companyprofile

C-EPRI Electric Power Engineering Co., Ltd. (C-EPRI) is a high-tech enterprise wholly owned by NARI Group Corporation (NARI), a subsidiary of State Grid Corporation of China (SGCC). C-EPRI is mainly involved in the research, manufacturing and engineering related to Classic HVDC (LCC-HVDC), HVDC Flexible (VSC-HVDC) as well as DC Grid technology.

We provide a wide range of HVDC-related products including converter valves, DC yard equipment, along with control and protection systems. We also provide world-class turnkey solutions tailored to your specific needs. We are dedicated to making contributions to the increased challenges being faced in the sustainable development of electricity networks.

State-of-the-art HVDC solutions . . . creating new possibilities and meetingyour future challenges.

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Servicesprovided

Supporting you with complete one-stop service

C-EPRI’s turnkey solutions for HVDC systems support you throughout the whole project process — through network analy-sis, engineering design, product supply, installation and commis-sioning.

Our advanced simulation and modelling tools allow us to carry out detailed studies of your systems to assist with system analy-sis, network design and complete solution optimisation.

Using our world-class laboratories, we make sure that our prod-ucts are fully tested before delivery to site, ensuring their proper operation even in the most onerous conditions.

Our specialised team delivers comprehensive support through-out the entire lifetime of a project. Every detail is fully controlled and high standards are guaranteed.

HVDC Flexible solutions for

Renewable energy integrationSupply for offshore loadsIn-feed to city centresMulti-terminal interconnection

Turnkeysolutions

UHVDC converter station

Classic HVDC solutions for

Back-to-back connectionUndersea cable transmissionUHVDC overhead transmissionDe-icing applications

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HVDC Flexible converter station

HVDC transmission systems use direct current instead of alternating current for the transmission of electricity. Conventional line commutated converter (LCC) HVDC converters use high power thyristors for electricity conversion from AC to DC and vice versa.

Typical applications include back-to-back interconnections of asynchronous networks and overhead or submarine transmission of electricity over long distances.

In applications where load centres are located far away from energy resources, UHVDC transmission shows great superiority. Compared to a conventional ±500kV HVDC scheme, a ±800kV UHVDC scheme can reduce transmission losses of up to 60% and provide power capacities up to 8000MW and even more, almost doubling that of a ±500kV scheme. UHVDC is expected to play a major role in shaping bulk power highway for smart electric-ity grids.

When the transmitted power is increased above 10GW, higher rating UHVDC systems will be required – either by increasing voltage level (e.g. 1100kV) or at existing voltage ratings with higher current carrying capabilities (e.g. 6250A). Both solutions are available with C-EPRI.

HVDC andUHVDC

Shaping up superhighways for power grids

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Catering to the booming market for UHVDC applications both in China and abroad, we developed an A5000 type LCC-UHVDC converter valve technology, which makes use of electrically triggered thyristor (ETT). It is rated up to ±1100kV/6250A, while downwardly compatible with lower voltage applications. The A5000 type valve has passed all the type tests conforming to IEC60700 standard, accredited by DNV KEMA. Since 2011, A5000 technology has been applied in 4 projects, all with well proven performance.

Key features High power densityHigh availability and reliability with multi-redundancySuitable for up to ±1100kV/6250A applicationSuitable for high altitude (4000m)Excellent seismic performance (0.3g typical)

A5000 converter valve tower A5000 valve in type test A5000 valve module

A5000 UHVDCconverter valve

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HVDCFlexible

Deliver green power Shape future grid

HVDC Flexible is a new HVDC transmission technology, based on a voltage source converter (VSC). It makes use of insulated gate bipolar transistors (IGBTs) instead of thyristors for power conversion between AC and DC. In comparison to Classic HVDC, the most outstanding features of HVDC Flexible are high controllability and flexibility, which lead to a number of potential advantages and applications.

By switching the IGBTs of the voltage source converter in a defined manner, HVDC Flexible generates a controlled output voltage, the magnitude and phase angle of which can be changed rapidly and flexibly. As a result, HVDC Flexible allows for independent and fast control of active and reactive power.

These advantages mean that HVDC Flexible provides an effective solution for wind farm integration, in particular for offshore wind farms with a transmission distance over 50-100km where an AC cable technology is not feasible. HVDC Flexible can also eliminate the requirement for a synchronous compensator and can minimise the footprint. The reactive power controllability of HVDC Flexible can also be used to adjust the AC network voltage and therefore contribute to improved power quality.

In contrast to Classic HVDC, power reversal in HVDC Flexible does not involve a change of DC voltage polar-ity, but via a change of DC current direction. This function makes HVDC Flexible a very attractive solution for multi-terminal systems.

Other benefits associated with HVDC Flexible include black start capability, firewall against disturbance, inher-ent STATCOM functionality, low environmental impact, etc. Due to its superior technical features, HVDC Flex-ible has a wide range of applications:

Renewable energy integration Supply of offshore loads In-feeds to city centres Multi-terminal systems Feeding into passive networks Grid interconnection and power trading

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An HVDC Flexible converter consists of three phase units; each one includes two converter arms, both with an arm reactor. Depending on the power and voltage ratings, each converter arm could be formed by a number of vertically-stacked valve modules; each module contains six identical sub-modules connected in series.

Each sub-module contains two IGBTs as the switching elements and a DC storage capacitor. The number of sub-modules is redundant to ensure the reliable operation of an HVDC Flexible system in case of component failures.

The FLECON1000 Control & Protection System (FLECON1000-CP) contains all the functionality needed to operate the converter station and to protect the HVDC equipment and AC yard equipment. It is applicable to both Classic HVDC and HVDC Flexible. Hierarchical design is employed for both software and hardware to achieve complex control and protection functions. Relative isolation is maintained between different levels of the hierarchical structure, coupled with dual redundant design, providing heightened availability and reliability.

M2000 HVDC Flexible® converter valve

M2000 sub-module

Key features

Hierarchical control and segmented protectionUniversal rack and modular designEasily scalable design and easy maintenanceDistributed hardware and software structureHigh availability and reliability with multi-redundancy

Key features

Up to 1000MW/±320kV, using 3300V/1500A IGBTEasily scalable with modular design Superior inflammability conforming to UL94Excellent seismic performance (0.2g typical)Using environmental-friendly materials (halogen-free)Easy assembly and maintenance

FLECON1000 Control & Protection System

M2000 valve module M2000 valve tower FLECON1000 control & protection system

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Analogue signal acquisition unit

DC Grid Equipment

Digital/Analogue real-time simulation systemTo ensure safe and reliable operation of HVDC Flexible systems, a digital/analogue real-time simula-tion system is developed to facilitate system analysis and parameter design. It can also verify the steady state and transient operation of both Valve Base Controller (VBC), and station control and protection systems.

Valve control system test platformThe platform can test and verify the function and reliability of LCC-HVDC valve control system including VBE and TTM (Thyristor Triggering and Monitoring unit). Test items include:

TTM full-function testVBE full-function testVBE EMC testVBE and TTM long-term operation test

DC circuit breakerDC circuit breaker is an essential component in materializing a DC grid, which will increase the robustness of the system during DC faults. As a pioneer in DC circuit breaker research, C-EPRI started relevant research activities as early as 2012, with type tests successfully finished at early 2015.

An advanced concept is proposed by combining mechanical switching based on ultra high-speed disconnect switch and power electronics switching based on high-power IGBT full-bridge cascade assembly, which not only avoids the high losses associated with a solid-sate breaker, but also overcomes the limit of switching speed of a mechanical breaker. As the first of its kind in the world, C-EPRI’s 200kV/1kA DC circuit breaker can interrupt 15kA fault current within 3 milliseconds, 100 times faster than the blink of a human eye.

AC/DC system simulation: can simulate and verify AC system with more than 300 buses, and VSC-HVDC system with up to 6 terminalsKey equipment functional test: can simulate up to 6000 MMC sub-modules HVDC Factory Acceptance Test (FAT)

HVDCsimulation

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DC-DC converterFunctionally, DC-DC converter in DC grid is similar to power transformer in AC grid; its main functions include DC grid networking, galvanic isolation and flow control. C-EPRI started R&D of DC-DC converter in early 2013. Currently, the research has come to the prototype phase, with a rating of 10kV/20kV, 3MW; type tests are planned to be finished by the end of 2015.

DC circuit breaker installation

HVDCTesting

HVDC valve testing laboratoryWith a strong research and development team, we have built a world-class test laboratory for high power electronic appli-cations. This is the third such laboratory in the world and the first in China capable of performing all the type tests (both dielectric and operational type tests) for up to ±1100kV UHVDC valve and ±500kV HVDC Flexible valve.

Additionally, it has been accredited by China National Accreditation Board for Conformity Assessment (CNAS), with type test reference for more than 10 HVDC projects, including 5 UHVDC projects and 2 VSC-HVDC projects.

Solid rock for reliable products

High power electronics laboratory AC voltage test facilities (600kV/5A)

Synthetic test facilities (80kV/7500A)

Manufacturesystem

Converter valve workshop

Quality control

Factory test

Sourcing control

Production process control

Factory inspection

On-site inspection

Switching impulse test

Valve testequipment

(VTE)

Repetitive firingtest equipment

(RFTE)

AC voltage test

Heat-run test

Hydraulic test

Ultra-clean environment, 10,000m2 High-efficient assembly lineAnnual production capacity: Converter valves for 3 UHVDC schemes and 2 HVDC Flexible schemes

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DC voltage test facilities(±2400kV/300mA)

Projectexperience

Consistent commitment to outstanding performance

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2. Xiamen Island supply VSC-HVDC projectCommissioning: 2015±320kV/1000MW/10.7km (subsea cable)World’s highest voltage and power ratings utilizing VSC-HVDC

3. Zhoushan five-terminal VSC-HVDC project feasibility study

Commissioning: 2014±200kV/1000MW/141km (subsea cable)World’s first 5-terminal VSC-HVDC system

4. Xiluodu-Zhejiang UHVDC projectCommissioning: 2014±800kV/8000MW/1680km World’s largest DC transmission project

5. Dalian City in-feed VSC-HVDC projectCommissioning: rescheduled±320kV/1000MW/47.6km (subsea cable) World’s highest voltage and power ratings utilizing VSC-HVDC

6. Southern Hami-Zhengzhou UHVDC project Commissioning: 2014±800kV/8000MW/2210km World’s largest DC transmission project

7. Jinping-Sunan UHVDC project Commissioning: 2012±800kV/7200MW/2100km

8.Sino-Russia HVDC BtB project Commissioning: 2012±125kV/750MW

9. Nanhui wind farm integration VSC-HVDC project

Commissioning: 2011±30kV/18MW/8.4km (land cable)

10. Ningdong-Shandong HVDC projectCommissioning: 2011±660kV/4000MW/1330km World’s first ±660kV HVDC project

11. Three Gorges-Shanghai II HVDC projectCommissioning: 2011±500kV/3000MW/1048km

12. Lingbao II HVDC BtB projectCommissioning: 2009166.7kV/750MWWorld’s first 4500A HVDC project

1. Lingzhou-Shaoxing UHVDC projectCommissioning: 2015±800kV/8000MW/1722km World’s largest DC transmission project

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