EPE Association: EPE 2005 - Topic 15-3: FACTS, Active, passive and combined filtering

EPE 2005 - Topic 15-3: FACTS, Active, passive and combined filtering
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 15: POWER ELECTRONICS IN TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2005 - Topic 15-3: FACTS, Active, passive and combined filtering

   [return to parent folder]

   A Fixed Point Variable Sample Rate Frequency Adaptive Bandpass Filter for Extraction of Synchronization Information from AC Utility Network Signals
By DAWSON Francis P.; ABIDI Asma; SHOKROLLAH TIMORABAD Hamid [View]
[Download]

Abstract: This paper presents design procedures for two adaptive bandpass filters with variable sample rates and fixed point implementations. Each bandpass filter can be used as an integral part of a Multirate Phase Lock Loop (MPLL) for extracting the fundamental component from an input signal. The MPLL provides synchronization information from zero crossings of power system AC signals. The MPLL incorporates frequency adaptation intrinsically by generating a sample signal which is an integer multiple of the fundamental frequency component. The integer multiple frequency is used as a sampling signal for all signal processing/filtering blocks within the MPLL. The bandpass filter ensures that the MPLL is robust against disturbances that appear on the power system. Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) architectures are studied for the design of bandpass filters. The FIR architecture offers unconditional stability and ease of implementation and hence is selected for the MPLL. The FIR filter is implemented on a Xilinx field programmable gate array.

   Coordinate Control of Distributed Generations with Power Converters in a Micro Grid
By BABA Jumpei; KUSAGAWA Shinichi; MASADA Eisuke; NAGY Istvan; OHSHIMA Masaaki [View]
[Download]

Abstract: For extensive utilization of distributed generation with the objectives of more efficient use of energy and introduction of renewable energy sources, the construction of a micro grid at demand end is inevitable. The micro grid should operate independently and have a good neighbor relation with the power grid, which supplies base power to it. A coordinate control scheme of distributed generations is studied. It has three layers of structure. The integrated control system is quite similar to that of power system other than its scale. Because of the limited number of generations and customers, the variation of power unbalance between supply and demand is fast and large. To stabilize the system and maintain power supply quality, the micro grid is subdivided into local distribution network groups. The local group control system regulates generations inside it in coordination with other groups and transmits operational information in it to the integrated control system. Each controllable generation has its own control system and regulates its output with the command from the local group control system.The distributed generation on the market, including the battery energy storage, is generally connected to the network through the power converter system. Because it can not autonomously follow the power variation, a novel control scheme should be incorporated into the control system of power converter system and the local level control. Their performances in operation of a micro grid are verified with simulations using EMTDC/PSCAD. The coordination between local group control systems for the load following control is under test in a model grid for experiment. A demonstration system is planned to construct on this control scheme.

   Multi-Level Medium Voltage Inverters for Reactive Power and Harmonic Compensation
By BOCQUEL AureLie; JANNING JoeRg [View]
[Download]

Abstract: With the promotion of decreasing prices for inverter modules many drive applications are equipped with active front ends instead of rectifier or thyristor bridges. With today’s IGBTs powerful medium voltage inverters with a quite high switching frequency in multilevel technology (typically three level NPC or four level floating capacitor designs) are available for metal and many other applications. Active front ends can be utilised to reduce or compensate harmonics produced by other loads or supply reactive power into the grid. Different methods of harmonic compensation and possible applications are discussed. Benefits of a Kalman filter approach are shown.

   Voltage Source Converters for maintaining of power quality and stability in power distribution
By GRUeNBAUM Rolf [View]
[Download]

Abstract: Applied to power systems, Voltage Source Converters with ratings reaching into the 100 MVA range enable effective dynamic as well as steady-state voltage control in subtransmission and distribution of power, as well as control of power quality. In comparison to traditional means like building of new lines, or upgrading of feeding voltages, this offers rational and economical utilisation of existing power systems. SVC Light is a concept based on a fast controllable voltage source converter and a filter bank. The paper highlights its technology as well as two important applications: flicker abatement in steel plants based on electric arc furnace metallurgy, and voltage stabilisation in weak grids fed by large wind power plants.

EPE 2005 - Topic 15-3: FACTS, Active, passive and combined filtering
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 15: POWER ELECTRONICS IN TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2005 - Topic 15-3: FACTS, Active, passive and combined filtering
	[return to parent folder]

	A Fixed Point Variable Sample Rate Frequency Adaptive Bandpass Filter for Extraction of Synchronization Information from AC Utility Network Signals By DAWSON Francis P.; ABIDI Asma; SHOKROLLAH TIMORABAD Hamid	[View] [Download]
Abstract: This paper presents design procedures for two adaptive bandpass filters with variable sample rates and fixed point implementations. Each bandpass filter can be used as an integral part of a Multirate Phase Lock Loop (MPLL) for extracting the fundamental component from an input signal. The MPLL provides synchronization information from zero crossings of power system AC signals. The MPLL incorporates frequency adaptation intrinsically by generating a sample signal which is an integer multiple of the fundamental frequency component. The integer multiple frequency is used as a sampling signal for all signal processing/filtering blocks within the MPLL. The bandpass filter ensures that the MPLL is robust against disturbances that appear on the power system. Finite Impulse Response (FIR) and Infinite Impulse Response (IIR) architectures are studied for the design of bandpass filters. The FIR architecture offers unconditional stability and ease of implementation and hence is selected for the MPLL. The FIR filter is implemented on a Xilinx field programmable gate array.

	Coordinate Control of Distributed Generations with Power Converters in a Micro Grid By BABA Jumpei; KUSAGAWA Shinichi; MASADA Eisuke; NAGY Istvan; OHSHIMA Masaaki	[View] [Download]
Abstract: For extensive utilization of distributed generation with the objectives of more efficient use of energy and introduction of renewable energy sources, the construction of a micro grid at demand end is inevitable. The micro grid should operate independently and have a good neighbor relation with the power grid, which supplies base power to it. A coordinate control scheme of distributed generations is studied. It has three layers of structure. The integrated control system is quite similar to that of power system other than its scale. Because of the limited number of generations and customers, the variation of power unbalance between supply and demand is fast and large. To stabilize the system and maintain power supply quality, the micro grid is subdivided into local distribution network groups. The local group control system regulates generations inside it in coordination with other groups and transmits operational information in it to the integrated control system. Each controllable generation has its own control system and regulates its output with the command from the local group control system.The distributed generation on the market, including the battery energy storage, is generally connected to the network through the power converter system. Because it can not autonomously follow the power variation, a novel control scheme should be incorporated into the control system of power converter system and the local level control. Their performances in operation of a micro grid are verified with simulations using EMTDC/PSCAD. The coordination between local group control systems for the load following control is under test in a model grid for experiment. A demonstration system is planned to construct on this control scheme.

	Multi-Level Medium Voltage Inverters for Reactive Power and Harmonic Compensation By BOCQUEL AureLie; JANNING JoeRg	[View] [Download]
Abstract: With the promotion of decreasing prices for inverter modules many drive applications are equipped with active front ends instead of rectifier or thyristor bridges. With today’s IGBTs powerful medium voltage inverters with a quite high switching frequency in multilevel technology (typically three level NPC or four level floating capacitor designs) are available for metal and many other applications. Active front ends can be utilised to reduce or compensate harmonics produced by other loads or supply reactive power into the grid. Different methods of harmonic compensation and possible applications are discussed. Benefits of a Kalman filter approach are shown.

	Voltage Source Converters for maintaining of power quality and stability in power distribution By GRUeNBAUM Rolf	[View] [Download]
Abstract: Applied to power systems, Voltage Source Converters with ratings reaching into the 100 MVA range enable effective dynamic as well as steady-state voltage control in subtransmission and distribution of power, as well as control of power quality. In comparison to traditional means like building of new lines, or upgrading of feeding voltages, this offers rational and economical utilisation of existing power systems. SVC Light is a concept based on a fast controllable voltage source converter and a filter bank. The paper highlights its technology as well as two important applications: flicker abatement in steel plants based on electric arc furnace metallurgy, and voltage stabilisation in weak grids fed by large wind power plants.