An unbalanced model predictive control method for star-chained statcom
A model predictive control and unbalanced technology, applied in the direction of output power conversion device, AC network circuit, multi-phase network asymmetry reduction, etc., can solve the problems of dynamic response to be improved, large number of switching states, and difficult parameter design , to achieve superior dynamic response speed, reduce the number of evaluations, and reduce the amount of calculation
Active Publication Date: 2022-07-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
Chained STATCOM based on cascaded H-bridge converters, as a typical flexible AC transmission technology equipment, usually uses the traditional synchronous reference frame current decoupling control method, which has complex control structure, difficult parameter design and dynamic response. Issues to be improved
As an advanced nonlinear control method, the model predictive control method is very suitable for chained STATCOM, but it also has the problems of a large number of switch states to be evaluated in each sampling cycle and a heavy computational burden on the digital processor. In addition, Chained STATCOMs also often work under unbalanced conditions, so an unbalanced model predictive control method for star-chained STATCOMs is needed to solve the above problems
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[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, which are to explain rather than limit the present invention.
[0069] figure 1 is a typical star-chain STATCOM topology diagram based on cascaded H-bridge topology, in which each phase is connected in series with N H-bridge sub-modules, i load_j (j=a,b,c) is the three-phase load current, i STAT_j (j=a,b,c) is the three-phase output current of STATCOM, u sab , u sbc and u sca are the three-phase line voltage of the power grid, C is the capacitance value of the DC bus, L is the inductance value of the STATCOM series reactor, and the parallel resistance R on the DC capacitor j_n (j=a,b,c; n=1,2,...,N) is used to characterize the loss difference of each H-bridge sub-module, T j_n1 , T j_n2 , T j_n3 and T j_n4 (j=a,b,c; n=1,2,...,N) are the upper left tube, lower left tube, upper right tube and lower right tube of the H bridge sub-module in ...
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The invention discloses a non-equilibrium model prediction control method of a star chain STATCOM. This method first establishes the equivalent power supply model of the star-chained STATCOM under unbalanced conditions, and then calculates the zero-sequence voltage in the equivalent power supply model. The H-bridge sub-modules are sorted by high and low, and the switching state that satisfies both the current control objective based on the equivalent power model and the DC voltage balance of the H-bridge sub-module is selected, so that the capacitor of the low-voltage H-bridge sub-module is charged, and the capacitor of the high-voltage H-bridge sub-module is charged. discharge. The control method of the invention realizes the control of the star-chained STATCOM under the unbalanced condition, and simultaneously solves the problems of the huge number of switch states that need to be evaluated in each sampling period of the model predictive control and the heavy computational burden of the digital processor.
Description
technical field [0001] The invention belongs to the technical field of flexible AC power transmission, in particular to an unbalanced model predictive control method applied to a star-chained STATCOM by a cascaded H-bridge type converter. Background technique [0002] With the continuous improvement of the new energy power generation technology level, mainly wind power and photovoltaic power generation, the continuous reduction of power generation costs, the more mature upstream and downstream industries, and the more flexible and diversified application methods, new energy power generation will continue to maintain a trend of rapid growth, flexible AC transmission Technology is of great significance to better support the power grid and new energy power generation construction. As a typical flexible AC transmission technology equipment, the chain STATCOM based on cascaded H-bridge converters usually uses the traditional synchronous reference frame current decoupling control ...
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IPC IPC(8): H02J3/00H02J3/18H02J3/26H02M7/00
CPCY02E60/60
Inventor 李宇飞刘普王跃张晓斌
Owner NORTHWESTERN POLYTECHNICAL UNIV