Questions and grid tie analysis problems. To observe the grid properly. Analyzing the grid status provides the correct grid structure model.
CLC number: P31: B Article ID: 1003* Deyang Electric Power Bureau used IES500 dispatch automation system and Shandong University to jointly develop PAS high-level management software, in which network topology analysis software is an important software developed by PAS. Deyang Power Bureau installed the network topology analysis software at the end of 1999 and put it into operation at the beginning of 2000, with significant results. The following describes the power network, topology analysis, and topology software.
1 Power System Network The power system is a network of generators, transformers, transmission lines, and electrical equipment. The main operation equipment of the Deyang area power grid includes generators, transformers, lines, busbars, shunt capacitor banks, and other grid equipment connected together to form a power grid in Deyang through switches and switches.
There are two kinds of steady-state and transient states in the operating state of the power system. Its operating state is described by operating parameters. The power system is often subjected to various sudden disturbances in operation. These disturbances cause the power system to be in a transient process. At this time, the operating parameters may change greatly. Changes in the operating parameters in the transient process may cause damage to the system. . Therefore, it is imperative to analyze various transient processes of the power system.
2 Topology Analysis Topology analysis is the grid wiring analysis. As the status of the switch and the switch are changed, the operation of the grid will change. Through the analysis of the real-time status of the switch and the switchgear, the connected power grid equipment is directly connected and the real-time wiring analysis must be performed.
Over-closed switches and switches are connected together and are the result of topological analysis.
3 Development of network topology analysis software 3.1 Software development technology basis Switching equipment is the most important grid equipment in topology analysis.
Its change of state will change the network structure and topological analysis of the grid model. The following is the EMS statement.
Information descriptions that are often used in topology analysis. See the relationship.
3.2 Network topology analysis Software development characteristics Node voltage, voltage phase angle, node injection active, reactive power, node load active, reactive power and other node data are obtained.
Find the equivalent branch data for lines, transformers, shunt capacitors, etc.
Using line physical parameters such as line voltage level, line length, wire type, and line spacing, the electrical parameters such as resistance, reactance, and susceptance/2 of the line are obtained by an approximate calculation formula.
Set up a database of physical parameters such as two-winding transformers, three-winding transformers, and generators.
Calculate load parameters such as load power, load voltage characteristics, and load frequency characteristics.
Together, all kinds of grid equipments that have been treated by equal value are lumped together. 7) According to the characteristics of nominal system and standard system, some network models suitable for calculation are made. In order to be able to process the programming in various operating modes.
Descriptive connection points for switching devices in the EMS-API. Topology node. The relationship between the electric islands and the like computes the nonlinear equations of the power flow calculation and the state estimation by linearizing them into linear equations and solving them step by step.
4 Conclusion The network and analysis of the grid status provide the correct grid structure model.
(: 2000* (Continued from page 32)) is 0. 5s. Because the 400V bus voltage is not restored to the normal value in 0.5s, all the frequency converter trips.
Inverter trip interlock, thermal protection fire protection action, resulting in a power supply to the powder machine trip, fire extinguishing furnace. Since the 85% Ue value in the parameter LineLossFault (grid power failure) cannot be rewritten, the inverter tripping is difficult to avoid when starting the No. 8 feed pump, and the three-phase AC UPS (uninterruptible power supply) is used to supply power to the primary power supply of the powder machine. Fundamentally solve the problem of frequency converter tripping when starting No. 8 feed pump.
4 Conclusion The vector output of the encoder of the vector inverter replaces the analog quantity so that the speed feedback can be accurately turned to one revolution, which improves the automation level of the No. 4 unit.
A total of 20 furnace No. 4 to the powder machine, when the powder motor by the slip control when the single power consumption of 22kW, after the inverter is controlled at the rated speed of single-machine power consumption of 0.2 ~ 0. 3kW, energy-saving effect is remarkable.
The network topology analysis software solves the stability analysis problem in the power grid operation and performs a more comprehensive analysis of the network end as a correct view
Round magnets, also named disc magnets, are thin flat circular magnets where the thickness does not exceed the diameter.
They are the most commonly used magnet shape and the most versatile.
They are used in holding applications where a hole is drilled and the magnet is recessed into the hole.
They are commonly used with cup assemblies to increase their holding strength.
Neodymium disc magnets are incredibly versatile and have superb strength for their size. They`re used in many commercial applications including modular retail displays and point of sale stands for holding panels to a steel framework and many new packaging designs use them cleverly trapped behind layers of cardboard to provide invisible closing mechanisms.
Round magnets have a diameter greater than thickness, and are available in sizes approx 3mm up to approx 100mm diameter. Pull strengths begin at around 250g and can reach up to 262kg!
Round Magnet,Ndfeb Round Magnet,N35 Round Magnet,Neodymium Ndfeb Big Round Magnet
Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com