Influence of the weight coefficients of measurements on the consistency of the assessment and calculation results of the power supply system steady-state operation conditions

2021 ◽  
Vol 25 (2) ◽  
pp. 172-182
Author(s):  
A. M. Glazunova ◽  
I. N. Kolosok
Keyword(s):  
Steady State ◽  
Power Supply ◽  
Power Supply System ◽  
State Assessment ◽  
The State ◽  
Steady State Mode ◽  
Test Circuit ◽  
Calculation Results ◽  
Control Equation ◽  
Weight Coefficients

The aim of this work is to develop an improved procedure for assessing the state of power supply systems based on adjusting the weight coefficients of measurements. To this end, non-linear optimisation methods were used. The control equations and the solution of the simultaneous linear equations were performed using the Crout method. The results of the calculation of the electrical power steady-state mode were considered as a reference. The lower the difference between the evaluation and steady-state calculation results, the higher the accuracy of the overall state assessment procedure. The problem of correcting the weight factors is set and solved as a nonlinear optimisation problem, where the optimisation parameters are taken as the dispersion of the measurements. The objective function was formulated as follows: to minimise the measurement evaluation dispersions that are part of a single control equation by maximising the active power measurements dispersion in the swing bus of the power supply system. In this study, limitations in the form of equation and inequality are monitored. The problem of optimising the dispersions is solved after the first iteration of the state assessment; starting with the second iteration, the state assessment is performed with new measurement weight factors. The calculations were performed on a 6-node test circuit. The control equations are drawn from the current measurements. The measurements data on the selected control equation of the test circuit are used to calculate the target function. The accuracy of the dispersions redistribution and their extreme values are controlled by the limitations. The results showed that, when adjusting the dispersion of measurements, the power assessments at all nodes are closer to the steady-state mode calculation results.

The Design of High Voltage DC Power Supply of 4.6GHZ/500MW LHCD

2011 ◽  
Vol 135-136 ◽  
pp. 1027-1036 ◽  
Author(s):  
Xu Hao ◽  
Yi Yun Huang
Keyword(s):  
Steady State ◽  
Power Supply ◽  
Power Supply System ◽  
Heating System ◽  
Power Source ◽  
Supply System ◽  
Current Drive ◽  
Lower Hybrid ◽  
Dc Power ◽  
Lower Hybrid Current Drive

The steady-state and transient performances of the power supply system of LHCD (Lower Hybrid Current Drive) heating system are highly demanded which makes it difficult to design the power source. In this thesis, the method of designing the 4.6GHZ/6MW power source of LHCD of EAST is discussed. And the results of the experiment are provided and some special characteristics are analysed to prove the accuracy of the method.

Statehood and Statelessness

2018 ◽  
pp. 209-217
Author(s):  
Fredrik Meiton
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
The State ◽  
General Assembly ◽  
Electrical Wire ◽  
Power Stations ◽  
Material Reality ◽  
State Of Israel

Chapter 7 follows the role of the grid in the emergence of partition as the preferred solution to the Palestine question. The deliberations over partition re-actualized the question of borders, dormant since the period of intense negotiation in the early 1920s. Again, the power supply system figured prominently in the deliberations. At this point, the network of power stations and electrical wire crisscrossing the land provided a thick materialization of the Zionist vision. This material reality was reflected in British deliberations and carried over into the U.N. Resolution 181 for the partition of Palestine, adopted by the General Assembly in November 1947. The same considerations played out on the battlefield, as the resolution triggered the 1948 War, from which the state of Israel and the statelessness of the Palestinians emerged in May 1948.

scholarly journals Method for control of the start-up regulating devicefor power transformers of the power supply system

2019 ◽  
Vol 21 (3) ◽  
pp. 135-145 ◽  
Author(s):  
V. S. Klimash ◽  
B. D. Tabarov
Keyword(s):  
Steady State ◽  
Power Supply ◽  
Power Supply System ◽  
Power Transformer ◽  
Electrical Equipment ◽  
Supply System ◽  
Zero Crossing ◽  
Third Phase ◽  
Three Phase ◽  
The Moment

Three-phase thyristor switches are designed for pulsed formation of inrush currents of electrical equipment with their subsequent shunting in steady state operation. In transformer substations, they perform a bumpless turning on of a power transformer by connecting its primary winding first to two phases of the network at the moment of zero crossing by the phase voltage of the network third phase, and then to the network third phase at the moment of zero crossing by the line voltage of the other two network phases. In this case, the starting currents of the transformer almost immediately enter the steady state without the appearance of constant components in the magnetization currents and voltage drop. To expand the functionality of thyristor switches, it is proposed, in addition to bumpless turning on of a power transformer, to disconnect it without arcing between the contacts of electrical equipment, as well as to carry out continuous voltage regulation for consumers when voltage in the network changes. The proposed method and structure for its implementation on the basis of two three-phase thyristor reactor keys and a capacitor bank make it possible while changing the network voltage to stabilize the generated reactive power at the input of the substation without creating the current distortions in the power transformer and power transmission simultaneously with stabilizing the substation output voltage. Modeling and research of the start-regulating device as part of a transformer substation was carried out in the MatLab environment. The results of numerical experiments in stationary and dynamic modes of the substation operation showed the feasibility of using the developed technical solutions for the industrial power supply system.

Rationalisation of the Operation Process of Power Supply Systems of Highway Telematics

2016 ◽  
Vol 817 ◽  
pp. 253-260
Author(s):  
Adam Rosiński
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
The State ◽  
System Of Equations ◽  
Operation Process ◽  
Supply Systems

The paper presents the issues related to the operation of the operation process of the power supply system of highway telematics. A relationships graph was presented in the considered system, and the Kolmogorov-Chapman system of equations was derived to describe it. Drawing on those equations, relationships for calculating probability of the power supply system staying in state of complete usability SPZ, state of the impendency over safety SZB as well as the state of unreliability of safety SB were derived. Next, this enabled rationalisation of the operation process of the analysed systems.

scholarly journals Synthesis of lunberger stochastic observer for estimation of the grinding operation state

2018 ◽  
Vol 224 ◽  
pp. 01133 ◽  
Author(s):  
Sergey Bratan ◽  
Stanislav Roshchupkin
Keyword(s):  
Steady State ◽  
Riccati Equation ◽  
Real Time ◽  
The State ◽  
Technological System ◽  
Steady State Mode ◽  
Estimation Errors ◽  
Optimal Estimates

The technique of constructing Lunberger stochastic observer for the operation of circular external grinding is considered in the article, which makes it possible to obtain optimal estimates of the output parameters of the technological system. To build Lunberger stochastic observer, a program has been developed that allows solving the Riccati equation of the object and the filter. The calculation of the Kalman-Buсy filter coefficients for the steady-state mode of the process of grinding the camshaft journal is performed. This allows us to evaluate the state of the system in real time, and even in the case of measuring only one coordinate, the filter gives estimates of all coordinates, and the maximum estimation errors do not exceed 10%.

scholarly journals Automatic Calculation Method of Load Resonant Frequency of Photovoltaic Power Supply

2021 ◽  
Vol 15 ◽  
pp. 945-952
Author(s):  
Xinying Zhao ◽  
Kun Luo
Keyword(s):  
Steady State ◽  
Resonant Frequency ◽  
Resonance Frequency ◽  
Power Supply ◽  
Calculation Method ◽  
Power Supply System ◽  
Supply System ◽  
Normal Operation ◽  
Automatic Calculation ◽  
Photovoltaic Power

The resonance phenomenon of photovoltaic power supply load makes the output voltage of grid-connected photovoltaic power supply system difficult to keep stable, which brings trouble to power supply. Therefore, it is necessary to study the automatic calculation method of load resonance frequency of photovoltaic power supply, so as to detect the load resonance frequency of photovoltaic power supply in real time, thereby ensuring the normal operation of photovoltaic power supply system. The load resonance frequency of photovoltaic power supply is divided into steady-state load resonance frequency and dynamic load resonance frequency. The mathematical model of load resonant circuit of photovoltaic power supply is established by calculating algorithm of load resonant frequency of photovoltaic power supply in steady state, and load resonant frequency of photovoltaic power supply in steady state is calculated. The resonance detection algorithm based on wavelet transform and Hilbert-Huang transform is used to analyze and calculate the load resonance frequency after detecting the resonance signal of photovoltaic power system. The experimental results show that the resonant frequency of photovoltaic power supply load calculated by this method is not much different from the actual resonant frequency of photovoltaic power supply load, and the error range is between-0.30% and 0.49%. Therefore, this method can keep the load resonance frequency of the photovoltaic power supply the same as the RF transmission resonance frequency, and can ensure the normal operation of the photovoltaic power supply.

scholarly journals Research on Fault Diagnosis of Launch Vehicle’s Power Transformation and Transmission System Based on Big Data

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yichi Zhang ◽  
Tao Shu ◽  
Xincheng Song ◽  
Yan Xu ◽  
Pengxiang Zhang
Keyword(s):  
Big Data ◽  
Fault Diagnosis ◽  
Power Supply ◽  
Power Supply System ◽  
Power Transmission ◽  
Launch Vehicle ◽  
Supply System ◽  
The State ◽  
Transformation System ◽  
Diagnosis Method

The on-board power supply system provides power for the launch vehicle. The power transmission and transformation system plays an irreplaceable role to ensure that the on-board power supply system receives the normal working voltage of the launch vehicle. There are many types of faults in power transmission and transformation systems. The traditional faulty diagnosis method of power transmission and transformation equipment has the disadvantages of being susceptible to experts’ subjectivity and model’s ossification. In this paper, a new method of equipment fault diagnosis based on big data is proposed. On the basis of big data, this paper introduces the failure mode clustering algorithm, the state parameter correlation analysis algorithm, the fault diagnosis method based on the correlation matrix, and other key fault diagnosis technologies. The fault record data of the 400 kV voltage grade oil-immersed transformer bushing in the past ten years by a Chinese combat unit is used as a case for demonstration. The results show that the accuracy rate of SC-LSTM-K-means clustering model exceeds 95%. And the fault classification mode can be accurately obtained. A priori correlation algorithm with TA coefficient can be used to evaluate the strong and weak relationship between the state parameters; the fault diagnosis matrix based on Pearson’s correlation coefficient can accurately determine the fault mode consistent with the actual operation and maintenance test results. Therefore, the fault diagnosis method of power transmission and transformation system based on big data can both effectively obtain the inherent laws of historical data and realize more accurate fault diagnosis with data adaptability.

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