• 한국인터넷방송통신학회논문지
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• 제12권4호
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• pp.189-194
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• 2012

수배전 무효전력 보상 감시 제어시스템은 수배전단에 설치된 유도 모터, 또는 아크 용접기 등과 같은 유도성 부하에서 발생되는 지상무효전력을 보상하고 역률의 개선, 전압 강하의 경감, 전력손실을 감소 시켜줌으로써 전력설비 계통을 경제적이고 안정적으로 운영하도록 도와준다. 그리고 이러한 시스템은 중앙전력감시반이 획득한 수변전설비의 운전상태 및 계측 Data를 근거로 역률 및 위상각을 분석하여 기준 위상각이상으로 전압과 전류의 위상차가 발생 되었을 경우, 무효전력 보상장치의 ON/OFF제어를 수행하여 효율적인 계통관리가 가능하도록 한다. 본 연구에서는 능동데이터베이스를 이용하여 무효전력 보상장치 감시제어 시스템을 구현하는 방안을 제시함으로써, 공장 부하의 지상무효전력이 급격한 증가로 인한 역률 저하, 전압 강하, 손실 발생 등의 징후 발생 시 이에 대한 대처를 사용자(operator)의 개입 없이 데이터베이스 스스로 수행하도록 함으로써 인위에 의한 실수를 최소화 하도록 하였다.

• 대한전기학회논문지
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• 제38권10호
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• pp.805-810
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• 1989

This paper presents a method for planning reactive power compensation such as shunt capacitors and reacters so as to maintain bus voltage in acceptable range during steady state operation in power system. The algorithm in this paper decomposes the problem into reactive power planning module for the compensation of bus voltage and load flow module for adjusting the error resulted from the linear approximation. A planning technique is based on linear programming to minimize the amount of added reactive power compensation in each case. Transformer tap settings and generator voltages are adjusted to minimize the compensation. The constraints are the operation limits of the control variables and bus voltages. The result of one sample system is presented to confirm the practical use of the proposed algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.45-47
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• 1994

The simulation of reactive power compensation in 5-bus and 25-bus system was conducted using transmission-line loss system identification method. Sensitivities of maximum load-power with respect to reactive power compensation was identified by the simulation. With sufficient reactive power compensation at the first voltage-collapsing load-bus, the first voltage collapse could be prevented until the next voltage-collapsing load-bus lost its voltage stability. And the total compensated reactive power at the first voltage-collapsing bus means reactive power margin of voltage collapse or distance to voltage collapse. This quantity can be useful for determining the size of compensating devices or the site to compensate.

• 대한전기학회논문지:전력기술부문A
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• 제51권7호
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• pp.327-332
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• 2002

In this paper, conventional reactive power compensation is defined and instantaneous real control concept for shunt converters is proposed. This equipment incorporates the compensation function of harmonics at the distribution line by nonlinear load. These methodologies are applied to IEEE 13 distribution system with the modeling of nonlinear load using EMTEDC/PSCAD package. Simulation with EMTDC results presented to confirm that the new approach has better performance than those obtained by controllers based on traditional concepts of reactive power compensation.

• 대한전기학회논문지
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• 제36권3호
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• pp.163-170
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• 1987

It is known that reactive component of AC power in the power system gives no energy to outside and cuses enlargiment of power apparatus, voltage fluctuation and unstability of power system. The power conversion system and control system which are composed of power semiconductor devices such as tyristor, transistor, GTO and so on have been appeared as new sources of reactive power. So the cmpensation of reactive power in power semiconductor systems is one of impending problem on the point of energy conservation and inprovement of power factor. This paper treates the fundamental review of the current type power compensation system that compensates the reactive power by MOSFET inverter. This inverter detects not only the reactive power of fundamental wave but also that of all harmoics created in the power semiconductor system and is scheduled to control by sampled value.

• Journal of Power Electronics
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• 제13권4호
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• pp.719-728
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• 2013

A novel hybrid active power filter (NHAPF) that can be adopted in high-voltage systems is proposed in this paper. The topological structure and filtering principle of the compensating system is provided and analyzed, respectively. Different controlling strategies are also presented to select the suitable strategy for the compensation system. Based on the selected strategy, the harmonic suppression function is used to analyze the influence of system parameters on the compensating system with MATLAB. Moreover, parameters in the injection branch are designed and analyzed. The performance of the proposed NHAPF in harmonic suppression and reactive power compensation is simulated with PSim. Thereafter, the overall control method is proposed. Simulation analysis and real experiments show that the proposed NHAPF exhibits good harmonic suppression and reactive power compensation. The proposed compensated system is based on the three-phase four-switch inverter, which is inexpensive, and the control method is verified for validity and effectiveness.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1027-1029
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• 2003

STATCOM which is connected the load parrallel with capacitor. is the reactive power compensation device. In this paper. appling the PSIM(POWERSIM) software to STATCOM system. it is simulated the reactive power compensation of balancing load. And, setting a thoroughly going over it's results. we confirmed the function propriety of developed STATCOM system. So, it will be applied the reactive power compensation experimentation of the developing 30kVA STATCOM at our laboratory.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2481-2483
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• 1999

This paper proposed the p-q-r coordinate system where the instantaneous active power p, and the two instantaneous reactive powers $q_{q}$, $q_{r}$ were defined. The three power components are linearly independent, so the compensation for the two instantaneous reactive powers leads to control the two components of the current space vector. With the theory, the neutral current of a three-phase four-wire system can be eliminated by only compensating the instantaneous reactive power using no energy storage element.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.131-133
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• 1998

This paper, proposed the p-q-r coordinate system where the instantaneous active power p, and the two instantaneous reactive powers $q_{q}$, $q_{r}$ were defined. The three power components are linearly independent, so the compensation for the two instantaneous reactive powers leads to control the two components of the current space vector. With the theory, the neutral current of the three-phase four-wire system can be eliminated by only compensating the instantaneous reactive power using no energy storage element.

• Journal of Electrical Engineering and Technology
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• 제8권6호
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• pp.1380-1388
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• 2013

The conventional graphical representation of the instantaneous compensation power flow for single-phase active power filters(APFs) simply represents the active power flow and the reactive power flow which flowing between the power source and the active filter / the load. But, this method does not provide the information about the rectification mode and the compensation mode of APFs, especially, the loss for each mode was not considered at all. This is very important to understand the compensation operation characteristics of APFs. Therefore, this paper proposes the graphical representation of the instantaneous compensation power flow for single-phase APFs considering the instantaneous rectification mode and the instantaneous inversion mode. Three cases are verified in this paper - without compensation, with compensation of the active power 'p' and the fundamental reactive power 'q', and with compensation of only the distorted power 'h'. To ensure the validity of the proposed approach, PSIM simulation is achieved. As a result, we could confirm that the proposed approach was easy to explain the instantaneous compensation power flow considering the instantaneous rectification mode and the instantaneous inversion mode of APFs, also, Total Harmonic Distortion(THD)/Power Factor (P.F) and Fast Fourier Transform(FFT) analysis were compared for each case.