The Experts below are selected from a list of 4821 Experts worldwide ranked by ideXlab platform
Kiyong Kim - One of the best experts on this subject based on the ideXlab platform.
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power system stabilizer performance with Summing Point type var power factor controllers
Pulp and Paper Industry Conference, 2006Co-Authors: Richard C Schaefer, Kiyong KimAbstract:Var/power factor control for generators has often been the preferred operating control mode for pulp and paper power plants over voltage regulation to reduce the need for constant reactive power monitoring by plant operators. Today, for those machines located in the Western United States, the North American Reliability Council (NEPC) and Western Electric Co-coordinating Council (WECC) are ruling that machines rated more than 35 MVA or group of machines equal to or more than 75 MVA connected to the transmission grid through one transformer be operating in voltage regulating mode and be equipped with power system stabilizer to improve the transient stability of the system. The latest NERC and WECC standards do not allow for generators meeting these criteria to be operating in Var/power factor control. Over the years various types of Var/PF control have been provided. Two types of Var/PF controllers are available as described in IEEE 421.5. Type 1 Var/PF controller uses raise/lower signal based on generator output changes. The amount of raise/lower signal is a fixed voltage. The Var/PF controller of type 2 uses a PI controller, which changes a desired voltage setPoint smoothly in linear fashion. Both types are considered as a Summing Point type Var/PF controller. In this paper, the PSS performance is studied with type 2 Var/PF controller that does not have an undesirable PSS action caused by a sudden change in setPoint adjustment from the Var controller. The results illustrate that power system stabilizer performance is not deteriorated when the type 2 Var/PF control is implemented. This type of performance response can benefit pulp and paper mills who desire constant VAR/PF control but also requiring to meet the WECC regulation guidelines
Richard C Schaefer - One of the best experts on this subject based on the ideXlab platform.
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power system stabilizer performance with Summing Point type var power factor controllers
Pulp and Paper Industry Conference, 2006Co-Authors: Richard C Schaefer, Kiyong KimAbstract:Var/power factor control for generators has often been the preferred operating control mode for pulp and paper power plants over voltage regulation to reduce the need for constant reactive power monitoring by plant operators. Today, for those machines located in the Western United States, the North American Reliability Council (NEPC) and Western Electric Co-coordinating Council (WECC) are ruling that machines rated more than 35 MVA or group of machines equal to or more than 75 MVA connected to the transmission grid through one transformer be operating in voltage regulating mode and be equipped with power system stabilizer to improve the transient stability of the system. The latest NERC and WECC standards do not allow for generators meeting these criteria to be operating in Var/power factor control. Over the years various types of Var/PF control have been provided. Two types of Var/PF controllers are available as described in IEEE 421.5. Type 1 Var/PF controller uses raise/lower signal based on generator output changes. The amount of raise/lower signal is a fixed voltage. The Var/PF controller of type 2 uses a PI controller, which changes a desired voltage setPoint smoothly in linear fashion. Both types are considered as a Summing Point type Var/PF controller. In this paper, the PSS performance is studied with type 2 Var/PF controller that does not have an undesirable PSS action caused by a sudden change in setPoint adjustment from the Var controller. The results illustrate that power system stabilizer performance is not deteriorated when the type 2 Var/PF control is implemented. This type of performance response can benefit pulp and paper mills who desire constant VAR/PF control but also requiring to meet the WECC regulation guidelines
Frank E Van Vliet - One of the best experts on this subject based on the ideXlab platform.
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a 1 5 to 5 0ghz input matched 2dbm p 1db all passive switched capacitor beamforming receiver front end in 65nm cmos
International Solid-State Circuits Conference, 2012Co-Authors: Michiel C M Soer, Eric A M Klumperink, Bram Nauta, Frank E Van VlietAbstract:Phased arrays in CMOS for consumer communication bands aim to enhance receiver performance by exploiting beamforming with antenna arrays. Sensitivity increases with the number of antenna elements through array gain and interferers can be cancelled through the spatial filtering of the beam pattern [1]. For the latter, the linearity of the receiver before the beamforming Summing Point becomes a bottleneck as interferers are not cancelled yet. Phase shifting in the LO domain reduces the complexity in the signal path and enables the use of linear signal blocks, but has high requirements on the multiphase LO generation [2]. On the other hand, a switched-capacitor phase shifter can be very linear, but is limited by the linearity of the necessary input matching and element Summing g m -stages [3]. This paper proposes a fully passive phased-array receiver front-end which implements impedance matching, phase shifting and element Summing with only switched-capacitor stages for a high linearity.
Michiel C M Soer - One of the best experts on this subject based on the ideXlab platform.
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a 1 5 to 5 0ghz input matched 2dbm p 1db all passive switched capacitor beamforming receiver front end in 65nm cmos
International Solid-State Circuits Conference, 2012Co-Authors: Michiel C M Soer, Eric A M Klumperink, Bram Nauta, Frank E Van VlietAbstract:Phased arrays in CMOS for consumer communication bands aim to enhance receiver performance by exploiting beamforming with antenna arrays. Sensitivity increases with the number of antenna elements through array gain and interferers can be cancelled through the spatial filtering of the beam pattern [1]. For the latter, the linearity of the receiver before the beamforming Summing Point becomes a bottleneck as interferers are not cancelled yet. Phase shifting in the LO domain reduces the complexity in the signal path and enables the use of linear signal blocks, but has high requirements on the multiphase LO generation [2]. On the other hand, a switched-capacitor phase shifter can be very linear, but is limited by the linearity of the necessary input matching and element Summing g m -stages [3]. This paper proposes a fully passive phased-array receiver front-end which implements impedance matching, phase shifting and element Summing with only switched-capacitor stages for a high linearity.
A Godhwani - One of the best experts on this subject based on the ideXlab platform.
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panel session for the 2000 ieee pes power meeting singapore sponsored by the excitation systems subcommittee of the energy development and power generation committee supplemental control in a modern digital excitation system
2000Co-Authors: K Kim, A GodhwaniAbstract:This paper presents various supplemental control functions such as VAr or Power Factor control, Power System Stabilizers, and Limiters. These are Summing Point type controllers and make up the outside loop of a two-loop system. The voltage regulator forms the inner loop and is implemented as a fast PID controller. Most of the outer supplemental control loops use PI controllers. The simplicity of the controllers and the ease with which they are designed/tuned makes the modern digital excitation system very attractive for varied applications, The practical issues related to various control functions are addressed. The test results indicate desirable features in the supplemental control functions.
