Two-stage distributed simulation method for wind electricity collection area based on distributed load flow calculation
A distributed simulation and power flow calculation technology, applied in design optimization/simulation, calculation, AC network circuits, etc., to achieve the effect of improving simulation speed and reducing calculation burden
Active Publication Date: 2015-01-14
TSINGHUA UNIV +2
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Problems solved by technology
To meet the needs of quasi-steady-state simulation calculations in current wind power collection areas
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[0019] The two-level distributed simulation method of wind power collection area based on distributed power flow calculation proposed by the present invention is described in detail as follows in conjunction with the embodiments:
[0020] The two-level distributed simulation method of wind power collection area based on distributed power flow calculation proposed by the present invention is characterized in that the simulation calculation at each moment includes two parts: backbone network simulation and sub-network simulation in the wind farm. The time interval Δt is set to the order of ten milliseconds (generally, the value range is between the half cycle corresponding to the 50Hz power frequency and the delay of various protection actions, which is 10ms in the embodiment); wherein, the backbone network simulation specifically includes the following steps:
[0021] 1.1) Extract the backbone network data obtained in the last step of the simulation calculation at the previous moment...
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The invention relates to a two-stage distributed simulation method for a wind electricity collection area based on distributed load flow calculation, and belongs to the simulation field of wind electricity collection areas of electrical power systems. The method includes the steps that backbone network data obtained through the last step of simulating calculation at the previous moment are extracted to be used as an initial value of the first step of backbone network load flow calculation at the current moment; data obtained through the I-1 step of simulating calculation of sub networks inside wind fields at the current moment are extracted to modify the injection rate of the wind field access nodes in a backbone network; according to the obtained data, the I step of backbone network load flow calculation is conducted, and a wind power plant access point voltage vector is obtained through the I step of calculation; per-unit processing is conducted on the wind power plant access point voltage vector obtained through the I step of calculation and a wind power plant access point voltage vector obtained through the previous step of calculation, the above voltage vectors are subtracted, then an infinite norm is solved, and if the requirement for maximum deviation for acceptance is met or the calculation step number reaches an upper limit, main network simulation and wind field sub network simulation at the current moment can be achieved. The two-stage distributed simulation method for the wind electricity collection area based on distributed load flow calculation lowers calculation load approximately, increases the simulation speed and is suitable for simulating the dynamic characteristics of the wind electricity collection area for a long time.
Description
Technical field [0001] The invention belongs to the field of simulation technology of wind field collection area of power system. Background technique [0002] In recent years, several voltage-induced multi-wind farm cascading out-of-grid accidents have occurred in the wind power collection area. The sequential quasi-steady state simulation of the regional power grid is considered to be an effective method to analyze the system voltage security status and the mechanism of accident spread. The time sequence simulation of the wind power collection area is to establish a quasi-steady state model of the wind turbines, static reactive power compensation devices, static reactive power generators and other equipment in the wind farm, combined with the static model of the wind farm internal network and the collection area network, and through the calculation model To complete the simulation of the change process of physical quantities such as voltage and power in the wind power collect...
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CPCH02J3/00H02J2203/20G06F30/20G06F30/367G06F2119/06Y02E60/00Y04S40/20
Inventor 郭庆来蓝海波孙宏斌刘海涛王彬王哲张伯明吴文传徐峰达
Owner TSINGHUA UNIV