A Modeling Stability Analysis and Design Method for Grid-connected Converter Multi-machine System
A multi-machine system and design method technology, applied in the direction of instruments, calculations, AC network circuits, etc., can solve the problems that cannot reflect the overall stability of the grid-connected converter system, the modeling process is complicated, and the dynamic coupling mechanism of the system cannot be reflected. , to achieve the effect that the modeling process is simple and easy
Active Publication Date: 2018-12-28
河北申科电力股份有限公司 +5
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Problems solved by technology
Since the grid-connected converter of the distributed power generation system has the characteristics of Plug and Play, when the grid-connected converter is cut in or out, the mathematical model of the system needs to be re-established, the modeling process is complicated, and it cannot reflect the grid-connected converter cut-in or cut-in. Removing the impact on the overall stability of the system cannot reflect the dynamic coupling mechanism of the system
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[0016] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0017] according to figure 1 and figure 2 The closed-loop transfer function of the system can be obtained as:
[0018]
[0019] When the second grid-connected converter is connected to the grid, the additional transfer function can be calculated according to the Extra Element Theorem
[0020] Substitute G 2 (s)=W 2 (s)·G 1 (s) The closed-loop transfer function of the two-machine grid-connected system can be obtained;
[0021]
[0022] Similarly, the closed-loop transfer function of the grid-connected converter multi-machine system can be obtained by analogy:
[0023]
[0024] Using the characteristic root distribution of the transfer function characteristic equation of formula (3) to design the system parameters can effectively avoid the mutual coupling resonance problem of the multi-machine grid-connec...
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The invention relates to a modeling stability analysis and design method for multi-machine system of grid-connected converter. The transfer function G1(s) can be calculated by the single closed-loop system of the grid-connected converter. Using the additional element theorem to calculate the additional transfer function W2(s) corresponding to the system when the second grid-connected converter is added. With the above steps, the transfer function G2(s) =W2(s) G1(S) of the dual closed-loop system of the grid-connected converter can be calculated. With the using of the additional element theorem, the additional transfer function WN(s) corresponding to the system can be calculated when the Nth grid-connected converter is added. According to the above steps, we can get the transfer function GN(s) = WN(s)...W2(s) G1(s) of the multiple closed-loop system of the grid-connected converter. According to the eigenvalue of GN(s), the parameters in the system can be designed. The invention has the advantages that the modeling process is simple and practicable. The method can not only embody the influences on the overall stability of the system when the grid-connected converter is cut in or cut out, but also reflect the coupling mechanism of the system. Through the method, the parameters can be designed properly to avoid a mutual resonance or a coupling of the multi-machine grid-connected system, thereby achieving reliable and stable operations of the multi-machine grid-connected system.
Description
technical field [0001] The invention belongs to the field of power electronics research, and in particular relates to a modeling stability analysis and design method for a multi-machine system of a grid-connected converter. Background technique [0002] With the large-scale access of distributed generation of renewable energy such as solar energy and wind energy to the power grid, the impact between the distributed power generation system and the power grid has become increasingly prominent. Therefore, a modeling stability analysis and design method for multi-machine system of grid-connected converters is developed to avoid the mutual coupling resonance problem of multi-machine grid-connected systems, and realize reliable and stable operation of distributed power generation systems. important research significance. [0003] Since the grid-connected converter multi-machine system is a high-order, nonlinear, strongly coupled multi-variable complex system, how to quickly and e...
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IPC IPC(8): H02J3/00H02J3/38G06F17/50
CPCG06F30/367H02J3/383H02J3/00H02J2203/20Y02E10/56
Inventor 郭小强郝丹丹
Owner 河北申科电力股份有限公司