Stable control method for grid connection of current source type converter
A stable control method and current source technology, applied in electrical components, circuit devices, climate change adaptation, etc., can solve the problems of oscillation, inability to sense grid frequency fluctuations, current source converters relying on phase-locked loops, etc. The effect of stability
Active Publication Date: 2022-01-21
安徽船途数字科技有限公司
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problem that the current source converter relies on the phase-locked loop, cannot autonomously synchronize the power grid, and cannot perceive the frequency fluctuation of the power grid, and avoids the current source converter from being connected to the grid under the influence of external disturbances and weak power grids. Current Oscillation, Improving the Stability of Current Source Converter Grid-connected System
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[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.
[0037] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways than described here. Therefore, the present invention is not limited to the specific embodiments disclosed below. limit.
[0038] see figure 2 , a stable control method for grid-connected current source converters. The stable control method is based on a stable control system. The grid-connected converter in the stable control system uses a current source converter, and the DC side of the current source converter passes through an inductor Electrically connected with the front-end converter; the AC side of the current source converter is connected to the grid through a CL filter...
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The invention provides a stable control method for grid connection of a current source type converter. The current source type converter works in a direct current control and reactive power control mode, adopts a double-loop control structure, and comprises a direct current control and reactive power control outer loop and an alternating current side voltage control inner loop. According to the invention, the current source converter dynamically realizes the autonomous synchronization function of a power grid according to the direct-current inductance, and a phase-locked loop is omitted; the direct current side current can sense the fluctuation of the power grid frequency in real time, that is, the per unit value of the direct current and the per unit value of the power grid frequency are linked in real time and are kept equal; and in a reactive power control outer ring, a stable controller is added, so that grid-connected current oscillation of the current source type converter due to the influence of working conditions such as external disturbance and a weak power grid is avoided, and the stability of a grid-connected system of the current source type converter is improved.
Description
technical field [0001] The invention belongs to the technical field of electrical control, in particular to the technical field of electrical control of new energy grid-connected converters, and in particular to a stable control method for grid-connected current source converters. Background technique [0002] According to the different energy storage components on the DC side, the grid-connected converter can be divided into a voltage source type grid-connected converter and a current source type converter. In order to maintain the voltage stability of the DC side of the voltage source converter, a large capacitor is connected in parallel on the DC side as an energy storage element, so that the DC side exhibits the characteristics of a voltage source. See Appendix figure 1 , in order to make the DC side present the characteristics of a current source and eliminate the current ripple on the DC side, a large energy storage inductor L is connected in series on the DC side; in...
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Patent Timeline
Login to View More IPC IPC(8): H02J3/38H02J3/44H02J3/24H02J3/18
CPCH02J3/381H02J3/44H02J3/241H02J3/1842H02J2203/20Y02E40/30Y02A30/60
Inventor 桑顺薛晓岑张雷黄杰杰
Owner 安徽船途数字科技有限公司