Decoupling method for MMC converter valve digital-analog hybrid simulation interface network
A digital-analog hybrid and simulation interface technology, applied in the field of decoupling algorithms, can solve problems such as delay, error can not be well compensated, MMC flexible DC transmission system interface design without systematic elaboration, etc., to reduce switching frequency and Loss, solve simulation difficulties, choose flexible effects
Inactive Publication Date: 2017-05-17
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology
Due to the existence of interface devices, it will bring a certain delay to the system, which will affect the stability of the interface system and the accuracy of data transmission.
The core of the digital-analog hybrid simulation is to realize the interface decoupling algorithm of the power connection technology. The current power connection technology mostly adopts the simple and easy ideal transformer algorithm, which cannot well compensate the error caused by the system delay. In addition, The existing power connection technology does not study the stability and accuracy of the power interface deeply enough, and there is no systematic explanation for the interface design of the MMC flexible direct current transmission system.
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[0053] For the MMC flexible DC transmission project in a certain city, the 220kV AC transmission line is connected to the converter transformer and the converter valve on the DC side, and the line length is 20km. 220kV AC line parameters are shown in Table 1:
[0054] Table 1
[0055]
[0056] Firstly, the decoupling system model is adopted on the AC system side, and the inductance and capacitance per unit length of the positive sequence and zero sequence of the line are respectively represented by L 1 、C 1 and L 0 、C 0 Indicates that the wave velocity, wave impedance, and travel time of the positive sequence and zero sequence are respectively v 1 ,Z 1 , t 1 and v 0 ,Z 0 , t 0 express. In power connection interface applications, the line travel time for decoupling must be greater than the total interface delay T del , let T del With a value of 200 milliseconds, the traveling wave transit time is calculated as follows:
[0057]
[0058] It is easy to see that...
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The invention provides a decoupling method for an MMC converter valve digital-analog hybrid simulation interface network. An MMC converter valve digital-analog hybrid simulation interface network comprises an MMC digital-analog hybrid digital simulation network, an MMC digital-analog hybrid simulation power interface, and an MMC digital-analog hybrid physical simulation network. The decoupling method comprises the following steps: establishing an MMC digital-analog hybrid digital simulation network; establishing an MMC digital-analog hybrid physical simulation network; and decoupling an MMC converter valve digital-analog hybrid simulation interface network. Through a transmission line interface decoupling algorithm and through flexible adjustment of the position of a converter transformer in MMC converter valve digital-analog hybrid simulation interface decoupling, MMC converter valve digital-analog hybrid simulation delay compensation under the condition of short circuit or no circuit is realized, the decoupling location of an MMC-based flexible DC transmission system digital-analog hybrid simulation interface can be selected more flexibly, a converter transformer can be simulated at a digital side, and the problem that it is hard to simulate a converter transformer at a physical side is solved.
Description
technical field [0001] The invention relates to a decoupling algorithm, in particular to a decoupling method for a digital-analog hybrid simulation interface network of an MMC converter valve. Background technique [0002] The DC grid contains a large number of high-power nonlinear power electronic devices. In order to accurately describe the dynamic characteristics of each part of the DC grid, the traditional simulation technology has encountered a bottleneck, and a new simulation technology needs to be introduced. Digital-analog hybrid simulation, also known as hardware-in-the-loop simulation (Power Hardware in-the-loop, PHIL), can connect digital simulation equipment and physical dynamic simulation devices together for overall simulation. This technology can realize the hybrid DC power grid in the future. Simulation verification of operating characteristics, feasibility, reliability, stability, control strategy, DC networking, grid design, system planning methods, and mul...
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Login to View More IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 谷怀广刘栋吴学光林畅万祥楠翟雪冰寇龙泽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD