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For power system operation, transient stability analysis is indispensable. Of late, electric power systems have become more complicated; thus, fast transient stability analyses are critical for online computations. In this paper, we apply the Taylor series expansion to a time domain equal-area criterion applicable to multimachine systems and propose a fast transient stability analysis method that...
Electric power systems are becoming more complex making them more difficult to control. Owing to recent developments in information and communication technologies, power system data have become available online. In this paper, we propose a method that can predict transient stability multi-swing step-out using “anomaly detection with data mining”. In particular, we focus our attention on the theory...
It is important to know the power system condition by calculating power flows. As an alternative to the Newton-Raphson method which requires much calculation and complex program, this paper proposes a highly reliable complex power flow calculation method that requires not Jacobian matrix but the I=YE equation. To consider the proposed method, two approaches were tested. Simulations are carried out...
Recently, some renewable energy sources such as wind power generation have been investigated extensively because of environmental problems associated with greenhouse gas emissions. Moreover, the suspension of nuclear power and feed-in tariff (FIT) systems accelerate the penetration of renewable energy, particularly wind power. In addition, there is more frequency deviation because of the fluctuation...
As electric power systems become larger and more complex, they become increasingly difficult to control. The problem of transient stability has, accordingly, attracted much recent attention owing to the concerns over the possibility of multiswings occurring in longitudinal power systems such as the Japanese power grid. Although multiswings are becoming an important issue, it remains difficult to develop...
Recent deregulation has increased the number of electricity transactions between areas. Tie-line available transfer capability (ATC) is an important index for such transactions. In longitudinal power systems such as those used in Japan, multi-swing is caused by the increase in tie-line power flows. This paper examines transient stability ATC, and proposes a generator output adjustment method that...
The electric power system has become larger and more complex in recent years, making transient stability a significant problem. Against this background, available transfer capability (ATC) has attracted increased attention. ATC refers to critical transmission power that can be added to the current power flow, and ATC can be used as a numeric index of stability. In this paper, tie-line transient stability...
Recent deregulation has increased inter-area electricity transactions. Also, renewable energy and distributed power generation have been introduced into power systems because of worldwide societal interest in environmental problems. However, renewable energies such as photovoltaic and wind power generation are unstable due to their dependence on natural sources. This has made power systems more complicated...
The electric power system has become larger and more complex recently, and transient stability has emerged as a significant problem. The tie-line ATC (Available Transfer Capability) is one of the important indices under the environment of the introduction of renewable energies and progress of deregulation. In this paper, a new method is proposed, which employs a NAS battery system on a generator bus...
In the process of the recent deregulation, the transactions of the electricity among areas have been increased. Especially, the tie-line ATC (Available Transfer Capability) is one of the important indices in the transactions. Conventional researches for ATC have mainly focused on the fast calculation, but it is expected that more flexible transactions will be possible by improving ATC. This paper...
This paper proposes a new aggregation approach for the single machine equivalent (SIME) method. To assess the transient stability of the power systems rapidly, observers sometimes need to aggregate a multi-machine system into a simplified system. However, there is more than one approach for aggregation and thus observers cannot know which way is the most appropriate. This paper first explains the...
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