Power-flow study

About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.

Introducing a Novel DC Power Flow Method With Reactive Power Considerations

Abstract: The DC power flow model is in widespread utilization in electricity-market applications and contingency analysis. The presented versions of this model can be classified into two categories: state-dependent, or Hot-Start, models and state-independent, or Cold-Start, models. A reasonable accuracy is reported in the literature regarding Hot-Start models as they take into account branch losses and bus voltages by using available base point. On the contrary, due to the absence of base point in Cold-Start models, branch losses must be either neglected or guessed (which is an uncertain precautionary measure), or evaluated by a cumbersome iteration process. In addition, the bus voltage profiles are inevitably considered to be flat. Hence, the accuracy of available Cold-Start models in different circumstances remains of great concern. This paper addresses this concern and unveils a new Cold-Start model that does not rely on a risky assumption. In other words, there will be no lossless or flat voltage profile assumption in the presented approach whereas the equations remain linear. Besides, the exact effect of the net reactive loads on phase angles is considered and, consequently, the reactive power balance equations are reflected in the model for the first time.

Continuous power supply with back-up generation

Abstract: A continuous power supply may include a turbogenerator to provide power to supply the load and or an energy storage element and possibly also to the primary energy source. Utilizing an isolated DC bus architecture permits bi-directional power flow among interconnected elements.

Recent results in secondary voltage control of power systems

Abstract: Recent results are reported on a pilot-point-based secondary voltage control in power systems. Similarities and differences compared to the optimal power flow methodology are described, and theoretical background for secondary voltage controller design is reviewed. Two complementary design problem formulations are reported, together with simulations on the New England 39 bus and Bonneville Power Administration 338 bus power system models. The results show the feasibility of the pilot-point approach and reveal the nature of the tradeoffs involved in secondary voltage controller designs. >

Load flow calculations in distribution systems with distributed resources. A review

Abstract: Distributed resources (DR) provide several challenges to distribution system analysis due to the models and solution techniques that are required for adequate representation and solution. Load flow analysis is used to determine voltage magnitude and phase angle at each system bus, power flow in each system branch, power injected by each generation source, and system losses. The power flow formulation for distribution systems may be both single- and three-phase. This paper reviews the models and techniques developed to date for load flow calculations in distribution systems with DR penetration.

Power generators and method and device for generating power

Abstract: In order to coordinate power generators (32-35) and consumers (36,37) in a power network using intelligent management, a method for generating power is provided wherein at least two decentralized power generators(32-35) are connected to an electric network (31), supplying said network (31) with power. A value for the current output of at least one power generator(32-35) is detected and compared to a theoretical output and according to the result, the output of the power generators (32-35) connected to the electric network (31)is adapted correspondingly.