Accurate transient stability assessment(TSA) and effective preventive control are important for the stable operation of powersystems. With the superiorities in precision and efficiency, data-driven methods are widely...
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Accurate transient stability assessment(TSA) and effective preventive control are important for the stable operation of powersystems. With the superiorities in precision and efficiency, data-driven methods are widely used in TSA nowadays. Data-driven TSA model can be adopted in the stability constraints of preventive control optimization, but existing methods are mostly iteration-based ones, which may result in low efficiency, sometimes even non-convergence. In this paper,an analytical representation method of data-driven transient stability constraint is proposed based on a non-parametric regression model built for TSA. key feature extraction and dominant sample selection are proposed to reduce the scale of the TSA model, and bi-level linearization is applied to further modify *** preventive control model is then formulated as a mixed-integer linear program(MILP) problem with the linearized analytical data-driven transient stability constraint, which can be solved without iterations. An overall procedure of datadriven TSA and preventive control is finally developed. Case studies show that the proposed method has high accuracy in TSA and can achieve effective preventive control of powersystem with high efficiency.
Compared to Si IGBTs, SiC MOSFETs can reduce switching losses, achieve higher switching frequencies and enable smaller converter size. However, due to the high dv/dt of SiC MOSFETs, certain topologies, such as two SiC...
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Flexible low-frequency AC transmission technology combines the advantages of 50 Hz AC transmission and DC transmission, and has good application scenarios. High voltage and large capacity AC/AC converters are the core...
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The internal powerequipment of ultrahigh voltage converter valve hall is numerous and complex in structure, involving the various information elements such as the temperature and vibration. Moreover, the gas inside u...
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In this paper, the pivot role of permanent-magnet pole in the electromagnetic and mechanical transfer process of the vibration in PMDC motor is clarified, and the transfer function is established to describe the trans...
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A large number of text and reports about the powerequipment are generated in powersystem, which consist of implicit information of operation condition and insulation status. With the development of convolutional neu...
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Incorporating positive temperature coefficient(PTC)ceramic particles into polymers provides a prospective alternative solution for suppressing severe electric field distortions caused by negative temperature coefficie...
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Incorporating positive temperature coefficient(PTC)ceramic particles into polymers provides a prospective alternative solution for suppressing severe electric field distortions caused by negative temperature coefficient(NTC)of electrical resistivity within polymer insulation in high voltage direct current *** effect of the Curie temperature of PTC particles on the inhibition of the NTC effect of cross-linked polyethylene(XLPE)is investigated in this *** temperature coefficient particles with varied Curie temperatures are surface-modified and melt blending with *** modified particles are dispersed on averagely in the *** electrical resistivity,space charge behaviour,and direct current(DC)electrical breakdown strength of the samples are investigated at different temperatures,exploring the effect of the Curie temperature of PTC particles on suppressing the NTC effect of *** is demonstrated that the reduction in Curie temperature can further suppress the NTC effect of XLPE,enhance the DC strength at elevated temperatures,and inhibit the internal space charge *** reduction in the Curie temperatures means that the initiation of the PTC effect advances,exhibiting a higher potential barrier and inhibiting the NTC effect more *** work may give a reference for improving the temperature stability of DC properties for XLPE cable insulation.
In operation, the negative temperature coefficient (NTC) electrical resistivity characteristics of polymeric insulating materials causes DC electric field distortion within powerequipment insulation and lead to the f...
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Half-wave commutated modular multilevel converter (HWC-MMC) is suitable for high-voltage large-capacity AC-AC conversion, and an appropriate capacitor voltage balancing strategy is essential. This paper analyzes the c...
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At present, line-commutated converter high voltage DC (LCC-HVDC) is the main force of long-distance cross-regional large-scale transmission. With the emergence of multi-infeed DC (MIDC) transmission system, the single...
ISBN:
(数字)9781837242900
At present, line-commutated converter high voltage DC (LCC-HVDC) is the main force of long-distance cross-regional large-scale transmission. With the emergence of multi-infeed DC (MIDC) transmission system, the single fault of the receiving-end AC system may lead to the first commutation failure of several LCC-HVDCs at the same time, causing a large amount of power shortage in the receiving-end power grid, which seriously affects the safe and stable operation of the power grid. In this paper, the influence of the inverter firing angle and the commutation voltage of the AC side on the first commutation process is analyzed. The first commutation security domain considering different AC fault types and parameters is established. Based on the analysis of the security domain, it is considered that the fault detection time and the control response time are the key to the mitigation of first commutation failure. The correctness of the proposed security domain and the influence of the detection/response time on the mitigation methods are verified by simulation. The research results lay a theoretical foundation for the first commutation transient security domain and the first commutation failure suppression method.
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