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Due to the inverter used, DG can not only integrate the active power into power grid but also support the grid with reactive power. This paper proposes an optimal configuration methodology of renewable DG so as to maximize the penetration level of DG considering the temporal characteristics of active-reactive power (P-Q). Further, the uncertainty output of the wind generator, photovoltaic and small...
This paper discusses the relationship of line overload cascading and loss of synchronism in interconnected power systems. The mechanisms of recent blackouts ending in loss of synchronism are reviewed and assessed. Further, theoretical considerations about the phenomenom of loss of synchronism ending in Out of Step (OOS) are discussed. Moreover, loss of synchronism scenarios are simulated in a multi-area...
This paper presents a new phase shifting transformer which is applied in multipulse diode/SCR rectifiers. Comparison of operational characteristics of a conventional phase shifting transformer and the proposed transformer was studied. Results show that the new phase shifting transformer can not only reduce greatly the harmonics of the grid side currents, grid side voltages and the load side voltages,...
Based on the thyristor phase-controlled rectifier technology of the industry DC power supply system, the existing system topologies and application on harmonic suppression of multi-pulse rectifier technology and passive filtering technology in the grid side are introduced. The harmful effects of the existing harmonic currents to the rectifier transformers and the disadvantages of the traditional schemes...
Harmonic instability has greatly influence on the safety and stability of AC/DC transmission system, which had been paid more attention by academic and engineering members. In the paper, Firstly the mechanism of harmonic instability is analyzed, based on which, a new method suppressing the harmonic instability is proposed combing with the technique characteristic of FCC-HVDC. Even harmonic filters...
A novel harmonic suppression rectifier transformer and its filter system based on transformer inductive filtering technology is proposed in this paper for the electrolytic rectifier system. The proposed rectifier transformer adopts three-winding structure, in which, the power winding at the primary side adopts star connection scheme, and both load and filter windings at the secondary side adopt delta...
Wavelength-division multiplexing (WDM) is basically frequency division multiplexing in the optical frequency domain, where on a single optical fiber there are multiple communication channels at different wavelengths. In this paper, we first analyze the different IP/WDM networking functional models, then discuss the IP over switched WDM architecture. We present an analysis the potential benefits of...
In order to study the transient response characteristics of Filter Commutated Converter (FCC) under the condition of single-phase earth fault, in the paper, referring to the CIGRE HVDC benchmark testing model (LCC-HVDC), on the basic of non-changing the short circuit ration (SCR) and some parameters, combining the connecting features of FCC, the new testing model based on FCC (FCC-HVDC) is established...
This paper presents a linear matrix inequality (LMI) method for the design of the wide-area time-delay damping (WATDD) controller of static synchronous series compensator (SSSC)-type flexible ac transmission system (FACTS) device to enhance the power stability of the interconnected power systems. Firstly, in order to reveal the single-input multi-output (SIMO) characteristic of the open-loop power...
Due to the frequent occurrence of fiber cuts and the traffic loss a failure can occur, network survivability becomes a critical concern in network design and operation. As networks migrate from ring based networks to mesh based networks, because its inefficient resource usage, researches on survivable WDM mesh network have received increasing attention. In this paper, we analyze the protection principle...
Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide-area backbone optical data communication networks. In this paper, we analyze some of the key architecture and discuss the models corresponding approaches and advances made toward addressing these issues. We first analyze the different IP/WDM networking framework models,...
Based on the wiring scheme and the operating principle of the inductive filtering converter transformer (IFCT), this paper analyzes the effect of harmonic on the converter transformer, and establishes the harmonic losses model for the traditional converter transformer (TCT) and the IFCT, respectively. Furthermore, according to the IEC61378-2 standard and the superposition principle, the harmonics...
In the paper, a novel filter commutated converter (FCC) is proposed, taking its special configuration into account, the reactive power compensation factor at the valve side (compensation factor in short) is defined. It's indeed necessary to research Compensation Factor how to influence on the commutated reactance and the HVDC transmission system's line voltage of the valve side without load, DC voltage,...
The new HVDC transmission system adopts the new converter transformer and the corresponding inductive filtering method, and its electrical topology structure is completely different from that of the existential HVDC transmission system. For the change of the controlled system, the transient response characteristics of the new HVDC transmission system will be accordingly changed when it adopts the...
The study on the harmonic characteristics of HVDC transmission system is important for analyzing the effect of harmonics on the operation of the electrical installation and the system. The new HVDC transmission system adopts the new converter transformer and the corresponding inductive filtering method, and it is a new electrical topological structure. As for a new system, the harmonic characteristics...
Compared with the traditional converter transformer, the new converter transformer has a unique connection. Based on the principle of the transformer coupling circuit and the actual design parameter of the transformer, the three-phase mathematical model, which includes the information about the new converter transformer's wiring feature, the electrical parameters, etc, is presented according to the...
In the traditional AC/DC transmission system, to reduce the effect of harmonics to the AC system produced by the converter, filters and reactive power compensating equipments are installed in the primary side. This article presents a novel converter transformer and harmonic suppression scheme- filter commutated converter (FCC), which can greatly restrain the harmonic current from flowing into the...
For announcing the electromagnetic transient course of the auto-compensator and harmonic shielding converter transformer, simulating the new-type converter transformer's voltage, current's input and output characteristics in the HVDC system and the interaction of the AC/DC system, This paper establishes the new-type converter transformer's transient simulation mathematic model using the synthetic...
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