Random power flow calculation method taking regard of multiterminal unified power flow controller
A stochastic power flow calculation and power flow controller technology, which is used in AC network circuits, flexible AC transmission systems, wind power generation, etc.
Active Publication Date: 2015-12-02
STATE GRID CORP OF CHINA +2
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[0004] Since UPFC has a strong power flow control capability, it will have a great impact on the operation status of the power system after it is put into operation. Therefore, the power system containing UPFC should be modeled and analyzed in detail to understand its impact on the power system. It poses a challenge to the traditional power flow algorithm
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[0038] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0039] The invention is a random power flow calculation method for a multi-terminal unified power flow controller (UPFC), which is used for random power flow calculation on the basis of considering various uncertain factors of the power grid. Such as figure 1 shown, including the following steps:
[0040] (1) According to the actual installation position of the multi-terminal UPFC, the steady-state model of the multi-terminal UPFC is established;
[0041] (2) According to the power grid data and the established multi-terminal UPFC steady-state model, establish a power flow calculation data model, and use the Newton-Raphson method for power flow calculation to determine the steady-state operation point of the power grid;
[0042] (3) According to...
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The invention relates to a random power flow calculation method taking regard of a multiterminal unified power flow controller (UPFC). Firstly a power flow calculation model is established for a power grid including a multiterminal unified power flow controller. An equivalent multiterminal injection power model is established according to a real installation condition of the UPFC. A Newton-Raphson method is employed to carry out the power flow calculation, and stable state operation points of the power grid are determined. Linearization calculation is carried out on a power grid power flow equation including the UPFC equivalent multiterminal injection power model at stable state operation points, and a Jacobian matrix is obtained. Secondly a random probability density function is established for various random factors in the power grid. After each order of a semi-invariant of each random variable is calculated and obtained, the semi-invariants corresponding to node voltages and line powers of the power grid are calculated based on a Jcobian matrix by using a semi-invariant method. Finally a probability density function of the node voltages and the line powers is obtained. The random power flow calculation of the power grid including the multiterminal UPFC is realized. The random power flow calculation method creates conditions for analyzing the influence of randomness of the power grid to the operation of the power grid.
Description
technical field [0001] The invention relates to a power system calculation method, in particular to a random power flow calculation method including a multi-terminal unified power flow controller (UPFC), which belongs to the field of power system dispatching operation. Background technique [0002] With the rapid development of high-power power electronic devices and their control technology, flexible AC transmission technology (FACTS) has played an increasingly important role in the power grid. As an express dynamic component, different from traditional electronically controlled mechanical devices, FACTS devices can adjust the state of the system in real time, quickly and smoothly, to meet the needs of flexible control system power flow, without changing the topology of the network and the scheduling of generator sets Under the planned situation, the controllability of the power flow and voltage of the system can be greatly improved, the transmission line can be operated cl...
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Login to View More IPC IPC(8): H02J3/00H02J3/18
CPCY02E10/56Y02E10/76Y02E40/10
Inventor 张宁宇刘建坤周前陈静安海云胡昊明
Owner STATE GRID CORP OF CHINA