A Dynamic Optimal Power Flow Algorithm for Power System Considering Unified Power Flow Controller
A power flow controller and power system technology, which is applied in computing, AC network circuits, instruments, etc., can solve problems such as increased difficulty in power grid operation, complex power grid operation characteristics, and insufficient power supply capacity in some areas, so as to broaden the applicable field and improve The effect of solving for efficiency
Active Publication Date: 2017-09-19
HOHAI UNIV
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Problems solved by technology
[0003] With the increasing load of the power grid, the operating characteristics of the power grid are becoming more and more complex, and a series of problems such as insufficient power supply capacity in some areas and difficulties in controlling reactive power and voltage make the operation of the power grid more difficult.
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[0037] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0038] UPFC equivalent mathematical model such as figure 2 Shown. UPFC is installed on line i-j, and the output voltage amplitude of inverter 1 (parallel side) is V E , The phase angle is θ E , The output voltage amplitude of converter 2 (series side) is V B , The phase angle is θ B . X E , X B Is the leakage reactance of parallel and series transformers, R E , R B These are the equivalent resistances including converters 1 and 2, parallel and series transformer losses. The controller collects the amplitude of the controlled bus voltage, the active and reactive power flow of the controlled line, and controls the voltage amplitude and phase angle of the two voltage sources through a certain control strategy based on the given values of these controlled variables , So as to realize the control of the controlled bus voltage amplitude a...
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The invention discloses an algorithm for a dynamic optimal power flow (DOPF) of a power system considering a unified power flow controller (UPFC). Dynamic Optimal Power Flow (DOPF) can satisfy the security and economy of the power system at the same time, and can consider the dynamic constraints between different time periods in a dispatch cycle, so it is widely used in the field of power system optimization operation; Unified Power Flow Controller (UPFC ) can control the power flow distribution of the line through parameter setting, and effectively improve the stability of the power system. Based on this, the present invention first studies the independent branch steady-state model of UPFC, then establishes a dynamic optimal power flow model including UPFC, and finally adopts the primal dual interior point method for solution. The simulation results of the example show that the introduction of UPFC can not only improve the system stability, but also reduce the unit cost and line loss of DOPF. In addition, the present invention also decouples the correction equations in the solution process of the primal dual interior point method by blocks, which greatly improves the solution efficiency of the dynamic optimal power flow.
Description
Technical field [0001] The invention relates to a dynamic optimal power flow algorithm of a power system considering a unified power flow controller, and belongs to the field of power system optimization operation. Background technique [0002] Optimal power flow (OPF) of the power system refers to the stable operation of the system by adjusting the control methods available in the system to achieve the predetermined goal and optimal system under the specific grid operation and safety constraints. Since the electricity demand of users fluctuates from time to time, the operating state of the power system is constantly changing. When operating personnel make scheduling plans, they usually divide the scheduling period into enough time periods, for example, divide 1 day into 24 hours, and assume that the system load does not change in each time period, and then forecast based on historical data and the experience of the operators The load level of each period. If there is no connec...
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IPC IPC(8): H02J3/00G06F19/00
Inventor 卫志农何天雨孙国强孙永辉臧海祥朱瑛高沁
Owner HOHAI UNIV