Application of MMC-HVDC System for Regulating Grid Voltage Based on Jeju Island Power System

Quach, Ngoc-Thinh; Kim, Eel-Hwan; Lee, Do-Heon; Kim, Ho-Chan

doi:10.6113/tkpe.2014.19.6.494

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…(5) We also introduced a single pole double throw switch to change the size of the parallel ceramic capacitor, change the voltage division ratio of the sensor, and enable the sensor to be applied in different measurement scenarios (low-voltage and high-voltage scenarios) with certain adaptive ability. (6) We utilized printed circuit boards (PCBs) to make sensor prototypes and build response testing platforms to test their performance and verify the feasibility of the method proposed in this paper.…”

Section: Discussionmentioning

confidence: 99%

“…In the power system, line voltage, as a basic data point, plays a very important role in numerous engineering projects and theoretical research [1][2][3][4]. Voltage measurement, as an important component of the power system, plays a decisive role in applications such as relay protection [5], energy metering, intelligent equipment control [6,7], and the online monitoring of overvoltage [8][9][10][11]. The accuracy, reliability, convenience, and speed of voltage measurement are key technical requirements in energy metering and relay protection, power system monitoring and diagnosis, and power system fault analysis, and they are the foundation for ensuring the safe operation of the power system.…”

Section: Introductionmentioning

confidence: 99%

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Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle

Tan,

Zhang,

et al. 2023

Sensors

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Non-contact voltage sensors based on the principle of electric field coupling have the advantages of simple loading and unloading, high construction safety, and the fact that they are not affected by line insulation. They can accurately measure line voltage without the need to connect to the measured object. Starting from the principle of non-contact voltage measurement, this article abstracts a non-contact voltage measurement model into the principle of capacitive voltage sharing and deduces its transfer relationship. Secondly, it is theoretically inferred that the edge effect of the traditional symmetric structure sensor plate will cause the actual capacitance value between the sensor plates to be greater than the theoretically calculated capacitance value, resulting in a certain measurement error. Therefore, the addition of an equipotential ring structure is proposed to eliminate the edge additional capacitance caused by the edge effect in order to design the sensor structure. In addition, due to the influence of sensor volume, material dielectric constant, and other factors, the capacitance value of the sensor itself is only at pF level, resulting in poor low-frequency performance and imbuing the sensor with a low voltage division ratio. In this regard, this article analyzes the measurement principle of non-contact voltage sensors. By paralleling ceramic capacitors between the two electrode plates of the sensor, the capacitance of the sensor itself is effectively increased, improving the low-frequency performance of the sensor while also increasing the sensor’s voltage division ratio. In addition, by introducing a single pole double throw switch to switch parallel capacitors with different capacitance values, the sensor can have different voltage division ratios in different measurement scenarios, giving it a certain degree of adaptability. The final sensor prototype was made, and a high and low voltage experimental platform was built to test the sensor performance. The experimental results showed that the sensor has good linearity and high measurement accuracy, with a ratio error of within ±3%.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle

Tan,

Zhang,

et al. 2023

Sensors

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“…MMC-HVDC의 DC링크단의 전압이 일정하다고 가정 하면, MMC의 출력 전류인   ,   는   ,   의 조정으 로 제어가 가능해진다 [3], [4] .…”

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A Strategy of Increasing the Wind Power Penetration Limit with VSC Type MMC-HVDC in Jeju Power System

Lee¹,

Kim²,

Kim³

et al. 2015

The Transactions of the Korean Institute of Power Electronics

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The Jeju Special Self-Governing Province is currently promoting the "Carbon-free Island by 2030" policy, which requires the use of renewable energy instead of fossil fuel so that the island will have no carbon gases generated by 2030. To implement this policy, the island plans to build a wind power plant capacity of 1.09 GW in 2020; this wind power plant is currently ongoing. However, when wind power output is greater than the power demand of the island, the stability of Jeju Island power system must be prepared for it because it can be a problem. Therefore, this study proposes a voltage source-type MMC-HVDC system linked to mainland Korea to expand the wind power penetration limits of Jeju Island under the stable operation of the Jeju Island power system. To verify the effectiveness of the proposed scheme, computer simulations using the PSCAD/EMTDC program are conducted, and the results are demonstrated. The scenarios of the computer simulation consist of two cases. First, the MMC-HVDC system is operated under variable wind power in the Jeju Island power system. Second, it is operated under the predicted Jeju Island power system in 2020.

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