The interactions between AC and DC syst.ms in the steady-state condition of powersyst.ms are investigated. Through a sensitivity analysis, the influence of DC control parameters on the operation of AC/DC syst.ms and ...
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The interactions between AC and DC syst.ms in the steady-state condition of powersyst.ms are investigated. Through a sensitivity analysis, the influence of DC control parameters on the operation of AC/DC syst.ms and that of AC control parameters on other AC parameters with the DC syst.m existing are discussed. The sensitivity matrices and the influence factors between AC and DC syst.ms are analyzed from various points of view. The sensitivity analysis made in this paper is expected to be of practical significance in such problems as load flow control, parameter regulation, voltage estimation, etc.
A practical ride through scheme bases on super capacitor energy storage syst.m for ASD (Adjustable Speed Drive) equipment is presented in this paper. The topology of ASD discussed adopts AC-DC-AC structure and 12 puls...
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ISBN:
(纸本)9780780391932
A practical ride through scheme bases on super capacitor energy storage syst.m for ASD (Adjustable Speed Drive) equipment is presented in this paper. The topology of ASD discussed adopts AC-DC-AC structure and 12 pulses diode rectifier as input interface. Super capacitor (SC) module connects to inverter DC bus to support DC voltage while power quality problems such as voltage sag or short-term outage take place in power source. A SC energy storage syst.m based 15kVA ASD prototype was developed. Digital simulation and physical experiments were carried out to verify the correctness and validity of proposed ASD ride through topology and control strategies.
The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The availab.e capacities of possible congested transmission lines are consider...
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The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The availab.e capacities of possible congested transmission lines are considered as commonly shared resources for bilateral and multilateral transactions in the market. Each transaction maximizes its profit using limited capacity of transmission line allocated by the ISO. Through the proposed decentralized optimization algorithms, the ISO searches the optimal allocation of the capacities of congested transmission lines to the individual transactions and finally the same market efficiency (social welfare) as centralized optimization is achieved. This decentralized approach is more suitable for power market environment since it does not require private and sensitive information submission from individual transactions to the ISO and the resource allocation decision is always feasible during iterations. The mathematical model, calculation procedure and relevant proof are presented. The computer test results from the IEEE 30 bus syst.m show clearly the effectiveness of the approach and its consistency with the centralized optimization.
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