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For the receiver power system, it is generally acknowledged that after the splitting of power grid the frequency of the islanded grid will decline because of the active power vacancy. But the actual operating experience indicates that when the active power vacancy exceeds certain extent, the voltage will drop but the frequency won't drop and even increases. This article discusses the interaction mechanism...
The single three-phase hybrid power system has the characteristic that the network structure is very complex. Based on signal injection method, a synthesized fault location method aimed at this characteristic is proposed in this paper. The method can fix fault segment with DC signal and fault position with AC signal. In this way, not only avoid the wrong judgment of fault branch because of the distribute...
After distributed generation accessed in the power distribution network, the traditional type of distribution network will be no longer a radial network any more. This will bring many uncertain factors and make some difficulty to protection configuration and setting. First, this paper reviews the proposed protection principles. But so far, a variety of improvement schemes have some shortcomings, but...
Through the analysis of the electromagnetic properties for the rotor coil of turbine generator, we obtained the main magnetic field variation characteristics for the rotor winding and put forward the short circuit fault between rotor inter-turns causing the potential difference and circulation between the parallel branches of generation stator winding spectral method was applied on the spectrum analysis...
To meet the power customer's satisfaction is the essential responsibility of the utilities. Considering the property of customer's satisfaction degree, an analytical interval assessment method of voltage sag frequency is proposed. The customer satisfaction degree is presented by an interval data corresponding to the voltage tolerance of tested equipment installed at the customer side. Based on the...
An analytical voltage sag assessment method is proposed considering the interval characteristic of customer satisfaction degree. Based on the relationship between fault line length and voltage amplitude, the critical fault position can be determined by iterative algorithm and the customer un-satisfaction area in the power supply system is determined also. Due to the interval characteristic of customer...
Because the past fault diagnostic methods of electric actuator are mostly taken in the control system, and tend to cover up the implementation of the fault itself, and the constant gain fault of actuator is not easy to determine. In response to these shortcomings. The mechanism of the actuator is analyzed in this paper, in order to identify the effective measuring points electric of actuator. A approach...
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