Frequency-dependent power-system static-load characteristics

1968 ◽  
Vol 115 (9) ◽  
pp. 1307 ◽  
Author(s):  
M.Y. Akhtar
Keyword(s):  
Power System ◽  
Static Load ◽  
Frequency Dependent ◽  
Load Characteristics

scholarly journals Evaluation of the Effect of Static Load Characteristics on the Level of Frequency during Separate Operations with the Grid

2020 ◽  
Vol 20 (4) ◽  
pp. 54-63
Keyword(s):  
Power System ◽  
Electric Power ◽  
Static Load ◽  
Short Circuit ◽  
Electric Power System ◽  
Static Characteristics ◽  
Steady State Mode ◽  
Load Characteristics ◽  
The Impact ◽  
Circuit Power

ue to the requirements for the quality of electrical energy becoming stricter, it is now relevant to assess the impact of various factors on the main quality indicators: voltage and frequency deviations of the network. One of these factors is the static characteristics of various loads, which under certain conditions can have a significant impact on the parameters of the power system. In this article, it is proposed to evaluate the influence of static characteristics on the network’s frequency level when it enters separate operation with the power system and with various changes in the steady-state mode, and also to investigate the relationship between the coef­ficients of the load regulating effect and the value of the short-circuit power or the length of the supply cable. Separate operation was considered because in this mode, the influence of the regulating effect of a powerful load on the mode parameters becomes more pronounced. The scientific novelty of this study consists in an algorithm that allows refining the frequency deviation of an isolated electric power system, taking into account and without taking into account the static load characteristics when changing the length of the supply cable in the KATRAN software package. The main result of this study is the almost direct relationship revealed between the influence of static load characteristics on the network frequency and the distance of the load with a large proportion of synchronous motors from the power source in an autonomous electric power system. We also evaluated the feasibility of taking the regulatory effect of the load into account when calculating electrical modes depending on the type of load and the calculated value of the short-circuit power.

The Static Characteristics of Modern Load Types and Their Influence on the Electric Network Operating Modes

Vestnik MEI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 20-28
Author(s):  
Viktor V. Buslov ◽  
◽  
Nailia Sh. Chemborisova ◽  
Keyword(s):  
Power Consumption ◽  
Power System ◽  
Static Load ◽  
Static Characteristics ◽  
Electrical Networks ◽  
Voltage Level ◽  
Electric Network ◽  
Operating Modes ◽  
Load Characteristics ◽  
System Operating

One of the main aims pursued in conducting a power system operating mode is to maintain the normal voltage level at the control points of the power system and at its consumers. The voltage operation parameters in the electric network must meet the requirements of Russian State Standard (GOST) 32144‑2013 in regard of permissible voltage deviations for electric energy consumers who are powered from this network. In addition, it is desirable for the consumer to have an optimal voltage level at which the costs for producing a unit of goods are kept to a minimum. Each load is characterized by different active power consumption and reactive power absorption as a function of voltage, which leads to changes in the network operating parameters. Thus, in studying the electric power system operating modes, it is necessary to take into account the load static voltage characteristics. In this study, the electrical regimes were numerically analyzed (using the RastrWin3 software package), the Jacobi matrix was calculated, and the resulting data array was approximated using the Gauss, Cramer, and numerical methods. The distribution of power consumption in an individual house/apartment is determined; modern equations for the static characteristics of domestic loads for an individual house/apartment and for load nodes belonging to the 6-20 kV and 110-220 kV voltage classes are derived, and standardized node sensornet lists for different electrical networks are calculated. The study results can be used in designing modern electrical networks, in optimizing the network operating modes, and in settling operational dispatch control matters. It has been proven based on the results from comparing the obtained equations of static load characteristics with the typical ones that the introduction of energy saving technologies and the use of modern types of electrical appliances generate the need to change the typical static load characteristics. The necessity of representing the load at nodes by full models of static load characteristics is shown.

A New Method to Optimize Locations of SVC Based on Risk and Static Load Margin

2013 ◽  
Vol 774-776 ◽  
pp. 1887-1890 ◽  
Author(s):  
Wei Zheng ◽  
Long Yue Zhang ◽  
Fu Bo Liang ◽  
Chao Ma ◽  
Yan Dong Xing
Keyword(s):  
Power System ◽  
Static Load ◽  
Risk Index ◽  
Wind Farms ◽  
System Security ◽  
New Method ◽  
Weak Links ◽  
Load Margin ◽  
Large Wind

A method was proposed selecting the location of SVC, considering the power system with large wind farms interconnected. The location can be determined by risk index, which comprises credibility and global severity, and static load margin simultaneously. The method could consider the weak links and buses under both fault and normal conditions thus make better contribution to the system security. Case study shows that the correctness and effectiveness of the proposed method, comparing with the usual one.

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