[논문]Planning of HVDC System Applied to Korea Electric Power Grid

Choi, DongHee; Lee, Soo Hyoung; Son, Gum Tae; Park, Jung-Wook; Baek, Seung-Mook

doi:10.5370/jeet.2018.13.1.105

Planning of HVDC System Applied to Korea Electric Power Grid 원문보기

Journal of electrical engineering & technology, v.13 no.1, 2018년, pp.105 - 113

Choi, DongHee (School of Electrical and Electronic Engineering, Yonsei University) , Lee, Soo Hyoung (Korea Electrotechnology Research Institute (KERI)) , Son, Gum Tae (LS IS Co. Ltd) , Park, Jung-Wook (School of Electrical and Electronic Engineering, Yonsei University) , Baek, Seung-Mook (Division of Electrical, Electronic, and Control Engineering, Kongju National University)

Abstract ▼ AI-Helper

This paper proposes pre-analysis on planning of high-voltage direct current (HVDC) transmission system applied to Korea electric power grid. HVDC transmission system for interface lines has been considered as alternative solution for high-voltage AC transmission line in South Korea since constructing new high-voltage AC transmission lines is challenging due to political, environmental and social acceptance problems. However, the installation of HVDC transmission system as interface line in AC grid must be examined carefully. Thus, this paper suggests three scenarios to examine the influences of the installation of HVDC transmission system in AC grid. The power flow and contingency analyses are carried out for the proposed scenarios. Power reserves in metro area are also evaluated. And then the transient stability analysis focusing on special protection scheme (SPS) operations is analyzed when critical lines, which are HVDC lines or high voltage AC lines, are tripped. The latest generic model of HVDC system is considered for evaluating the impacts of the SPS operations for introducing HVDC system in the AC grid. The analyses of proposed scenarios are evaluated by electromechanical simulation.

주제어

표/그림 (20)

그림 Fig. 1. Planned power plant in east-sea side and theproposed transmission for its installations in theKorea electric power grid
표 Table 1. Proposed scenarios of interface transmission systems for planned generations
표 Table 2. Interface power flows and interface line loadings of SN 1 in N ？ 1 contingency
표 Table 3. Interface power flows and interface line loadings of SN 2 in N ？ 1 contingency
표 Table 4. Interface power flows and interface line loadings of SN 3 in N ？ 1 contingency
표 Table 5. Power reserve in metro area with the proposed scenarios
그림 Fig. 2. Generator angle responses when two 765 kV T/L #3lines are tripped: (a) without generator trip; (b) with1 generator trip
그림 Fig. 3. Bus voltage responses when two 765 kV T/L #3lines are tripped: (a) without generator trip; (b) with1 generator trip
표 Table 6. SPS analyses of critical line trip on SN 1
그림 Fig. 4. Transmitted power responses with 1 generator tripwhen two 765 kV T/L #3 lines are tripped
표 Table 7. SPS analyses of critical line trip on SN 2
그림 Fig. 5. Generator angle responses in SN 2 when 765 kVT/L #1 two-lines are tripped: (a) 2 generators trip;(b) 3 generators trip
그림 Fig. 6. Bus voltage responses in SN 2 when 765 kV T/L #1two-lines are tripped: (a) 2 generators trip; (b) 3generators trip
그림 Fig. 7. HVDC responses when 765 kV T/L #1 two-lines aretripped with 3 generators trip: (a) active power; (b)reactive power; (c) alpha; (d) gamma; (e) DCvoltage; (f) DC current
그림 Fig. 8. Generator angle responses when 765 kV T/L #3two-lines are tripped in SN 3: (a) without generatortrip; (b) 1 generator trip
그림 Fig. 9. Bus voltage responses when 765 kV T/L #3 two-lines are tripped in SN 3: (a) without generator trip;(b) 1 generator trip
표 Table 10. SPS analyses of critical line trip on SN 3
그림 Fig. 10. HVDC responses when 765 kV T/L #3 two-linesare tripped with 1 generator trip: (a) active power:(b) reactive power; (c) alpha; (d) gamma; (e) DCvoltage; (f) DC current
그림 Fig. 11. (a) Generator angle; (b) Bus voltage when 765 kVT/L #1 two-lines are tripped with 2 generators tripby applying overload capability
그림 Fig. 12. HVDC responses when 765 kV T/L #1 two-linesare tripped with 2 generators trip by applyingoverload capability: (a) active power; (b) reactivepower; (c) alpha; (d) gamma; (e) DC voltage; (f)DC current

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제안 방법

Therefore, the analyses of the SPS operations of critical line trips for the proposed scenarios are essential to evaluate reliable operation. Consequently, the dynamic stability of this study focuses on the SPS operation analysis for critical line trip of east-sea side.
This paper analyzed the introduction of high-voltage direct current (HVDC) system as an interface line in the Korea electric power grid. Transmission line planning needs sufficient pre-studies for reliable and stable operation of power system.
This paper analyzes the SPS operations with the latest generic model of HVDC system, which provides not only detailed dc equivalent circuit but also various control algorithms to elaborate internal dynamics of HVDC system. Furthermore, voltage dependent current order limit (VDCOL) algorithm is implemented based on V-I characteristics of HVDC system.

이론/모형

In general, dynamic analysis in electric system depends on area of consideration of time scales and frequency bands. The SPS operation with large-scale power system is analyzed with balanced Root-Mean Square (RMS) simulation focusing on electromechanical characteristics in terms of simulation speed. Therefore, the case studies carried in this section are simulated balanced-RMS simulation based program.
Power flow analysis is a base analysis for inter- connecting transmission system in power system analysis. The power flow analysis is evaluated with practical data used in Korea Electric Power Corporation (KEPCO) based on the 6^th basic plan of long-term electricity supply and demand [5]. In addition, the planned nuclear plants are assumed by considering the 2^nd master plan for national energy [6].

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