The Effect of the Accuracy of Reactive Power Measurement on Transmission Node Cost

2013 ◽  
Vol 816-817 ◽  
pp. 598-601
Author(s):  
Hai Bao ◽  
Xiang Yu Zhang ◽  
Gang Liu ◽  
Ling Wang
Keyword(s):  
Cost Analysis ◽  
Power Distribution ◽  
Power Flow ◽  
Reactive Power ◽  
Power Measurement ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Data Measurement ◽  
The Cost ◽  
Do So

Power flow calculation is the fundamental of cost analysis of transmission node. In traditional methods, the rationality of the cost analysis is of more concern than the accuracy of the power flow calculation’s results. This paper starts from the reactive data that being used for power flow calculation, expatiate that the method of present reactive power data measurement is inaccurate and explains why it is inaccurate. What reactive power would do to node cost analysis and why it could do so are analyzed considering cost analysis of transmission node. At last, an example of IEEE 9 is used. And it is proved that the fluctuation of reactive power will affect the power distribution of the whole network, as a result affect the generators’ sale of electricity income to loads greatly.

A New Method for Online Steady-State Power Flow Calculation in Electric Power System

2013 ◽  
Vol 816-817 ◽  
pp. 1090-1093 ◽  
Author(s):  
Hai Bao ◽  
Xin Huang ◽  
Ling Wang ◽  
Gang Liu
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Active Power ◽  
Electric Power System ◽  
New Method ◽  
Power Measurement ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Measuring Accuracy ◽  
The Given

Owing to the given variables are measurable in online power flow calculation, the electrical variables of higher measuring accuracy should be chosen for calculation. Currently the theory of reactive power is deficient and several methods for reactive power measurement are briefly introduced in this paper. The inaccuracy of those methods is pointed out by the relevant references in non-sinusoidal conditions. The measuring accuracy of Active power directly obtained by voltage and current is the same as that of voltage and current. For increasing the accuracy of online power flow calculation, a method substituting voltage magnitude for reactive power is proposed in this paper. The new method eliminates the effects resulted from inaccurate reactive power measurement. The simulation results on software MATPOWER verify the correctness and rationality of the new method.

The Selection of Online Power Flow Calculation’s Known Quantities

2014 ◽  
Vol 986-987 ◽  
pp. 1396-1400
Author(s):  
Ling Wang ◽  
Hai Bao ◽  
Yu Long Chen
Keyword(s):  
Power Flow ◽  
Measurement Accuracy ◽  
Reactive Power ◽  
Power Measurement ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Power Regulation ◽  
Calculation Results ◽  
The Difference ◽  
Selection Of

The difference between schedule power flow and online power flow is that the former has no corresponding physical power flow, while the latter is the reappearance of existing physical power flow. Owing to the different premise, the selection of power flow calculation’s known quantities can be different. A schedule power flow schedules physical power flow for power system, so the selection of known quantities has strict requirements, such as active power and reactive power regulation capability. Since the physical power flow exists, the selection of online power flow calculation’s known quantities can be more flexible. For example, we can choose load bus as slack bus or replace PQ bus with PV bus. The example demonstrated that we could locate the stealing electricity buses by choosing load bus as slack bus. Considering that voltage amplitude measurement accuracy is higher than reactive power measurement accuracy, we can replace PQ bus with PV bus and make the power flow calculation results more consistent with the physical power flow. Finally, the examples show that online power flow calculation’s known quantities can be selected flexibly according to the actual situation rather than strictly following the classical power flow calculation requirements.

Research on Fast Decoupled Load Flow Method of Power System

2015 ◽  
Vol 740 ◽  
pp. 438-441 ◽  
Author(s):  
Wei Zheng ◽  
Fang Yang ◽  
Zheng Dao Liu
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Power Flow ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Load Flow ◽  
Reactive Power Optimization ◽  
Flow Calculation ◽  
Steady State Operation ◽  
Numerical Simulation Methods

The power flow calculation is study the steady-state operation of the power system as basic electrical calculations. It is given the power system network topology, device parameters and determines system health boundary conditions, draw a detailed operating status of the power system through numerical simulation methods, such as voltage amplitude and phase angle on the bus system the power distribution and the power loss. Flow calculation is the power system operation, planning and safety, reliability analysis, is fundamental to the system voltage regulation, network reconfiguration and reactive power optimization must call the function, so the trend has very important significance to calculate the power system.

scholarly journals The Optimization of the Location and Capacity of Reactive Power Generation Units, Using a Hybrid Genetic Algorithm Incorporated by the Bus Impedance Power-Flow Calculation Method

2020 ◽  
Vol 10 (3) ◽  
pp. 1034
Author(s):  
Insu Kim
Keyword(s):  
Genetic Algorithm ◽  
Power Generation ◽  
Calculation Method ◽  
Power Flow ◽  
Distribution Systems ◽  
Optimal Power Flow ◽  
Reactive Power ◽  
Hybrid Genetic Algorithm ◽  
Power Flow Calculation ◽  
Flow Calculation

Dynamic and static reactive power resources have become an important means of maintaining the stability and reliability of power system networks. For example, if reactive power is not appropriately compensated for in transmission and distribution systems, the receiving end voltage may fall dramatically, or the load voltage may increase to a level that trips protection devices. However, none of the previous optimal power-flow studies for reactive power generation (RPG) units have optimized the location and capacity of RPG units by the bus impedance matrix power-flow calculation method. Thus, this study proposes a genetic algorithm that optimizes the location and capacity of RPG units, which is implemented by MATLAB. In addition, this study enhances the algorithm by incorporating bus impedance power-flow calculation method into the algorithm. The proposed hybrid algorithm is shown to be valid when applied to well-known IEEE test systems.

An Advanced Algorithm of Power Flow Calculation for Radial Distribution Networks

2013 ◽  
Vol 860-863 ◽  
pp. 1933-1936
Author(s):  
Fei Han ◽  
Lei Wang ◽  
Guang Feng
Keyword(s):  
Radial Distribution ◽  
Power Distribution ◽  
Power Flow ◽  
Distribution Networks ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Advanced Algorithm ◽  
Radial Distribution Networks ◽  
End Node ◽  
The Given

Through the analysis of traditional forward and backward substitution method, put forward an advanced algorithm of power flow calculation applied for the radial distribution network. This method optimizes the numbered embranchments, nodes, branches, uses directly the branch impedance parameter and the given power of the end node to calculate the voltage and power distribution, And use MATLAB to compile power flow calculation program, which is proved to be feasible by an example.

scholarly journals Using smart meters for checking the topology and power flow calculation of a secondary distribution network

2019 ◽  
Vol 139 ◽  
pp. 01059
Author(s):  
Irina Golub ◽  
Evgeny Boloev ◽  
Yana Kuzkina
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Distribution Network ◽  
Smart Meters ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Three Phase ◽  
Secondary Distribution ◽  
Linear State ◽  
Selection Of

The paper analyzes options of using smart meters for power flow calculation and for assessing the state of a real three-phase four-wire secondary distribution network based on measurements of average values of active and reactive power and of voltages. The work is based on the authors’ research on allocation of measurements to ensure secondary distribution network observability and on selection of the most efficient method for linear and non-linear state estimation. The paper illustrates solution of a problem on identification composition of load nodes in the phases and reveals challenges related to voltage account in the neutral wire and in its grounding.

The Study of Wind Farm’s Equivalence Method and Verification

2012 ◽  
Vol 433-440 ◽  
pp. 4439-4445 ◽  
Author(s):  
Hong Lin ◽  
Qin Chao
Keyword(s):  
Power Loss ◽  
Power Flow ◽  
Wind Farm ◽  
Reactive Power ◽  
Electric Power System ◽  
Wake Effect ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Lower Error ◽  
Collector System

When the scale of wind farm is increased quickly, if not considering the impedance of the collection system within wind farm, the bigger error in power flow calculation may be caused. In this paper a simple equivalence method calculating the collector system equivalence impedance by using the equivalence power loss is proposed and wind farm’s equivalence output power model considering wake effect and wind speed is established. The models are applied in power flow calculation of the natural wind farm connected to Urumqi grid, Xinjiang. The results compared with original system power flow show that this method has lower error. By using the losses in the collector system, the method of computing the equivalence impedance is verified in this paper. The equivalence impedance of collector system is calculated from total active power loss and total reactive power loss and current flow of the collector system. The error analysis showed that the equivalence impedance of collector system has lower error. The test results show that the proposed equivalence method is effective and logical and has a certain practicality. The reference is given for farther studying safety and stability operation of electric power system including wind farm.

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