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Grid-connected inverter grid-side current control method

A grid-side current and control method technology, applied to AC network circuits, AC power input conversion to DC power output, electrical components, etc., can solve problems such as negative impact on system stability, achieve low withstand voltage, widen passive area, the effect of increasing the magnitude of the output impedance

Pending Publication Date: 2021-10-08
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO +1
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  • Claims
  • Application Information

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Problems solved by technology

However, under weak grid conditions, due to the interaction between the inverter and the grid impedance, the grid voltage feedforward will introduce additional positive feedback of the grid side current, which will have a negative impact on the stability of the system.

Method used

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  • Grid-connected inverter grid-side current control method
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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0026] see figure 1 It is the equivalent topology diagram of the LCL type filter inverter. where i ...

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Abstract

The invention discloses a grid-connected inverter grid-side current control method. According to an equivalent topological graph of an LCL type inverter, a controlled source (alphavpcc-igZv) is connected in series in a filter inductor L1 branch and a filter capacitor Cf branch, igZv simulates damping Zv to suppress resonance peak of the inverter, and a controlled voltage source alphavpcc can resist influence of power grid harmonic voltage on grid-connected current. The controlled source connected in series with the inductor L1 branch can be integrated into inverter control, and the controlled source connected in series with the capacitor Cf branch needs to be realized through an external active compensation device. The output impedance transfer function of the inverter can be derived according to the overall control block diagram of the inverter, and parameter design is carried out based on the passive theory. Therefore, the passive range of the inverter is widened, the output impedance intensity of the inverter is enhanced, and the system stability of the inverter and the suppression capability of the inverter to power grid disturbance are improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected inverter control, and relates to a grid-side current control method of a grid-connected inverter. Background technique [0002] In recent years, with the shortage of fossil energy and increasingly serious environmental pollution problems, renewable energy technology has been vigorously developed and popularized. As a key component of new energy grid-connected power generation, the inverter plays an important role. In order to attenuate the high-frequency switching harmonics generated by the on-off of power devices, the output of the grid-connected inverter will be connected to the grid through an LC or LCL filter, but the resonance peak of the LCL may cause grid-connected current oscillation, and even cause grid-connected The inverter is unstable. Especially under weak grid conditions, due to the interaction between the inverter output impedance and the grid impedance, couplin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M7/5387
CPCH02J3/381H02J3/01H02M7/53871H02J2300/20Y02E40/40
Inventor 殷伟斌倪秋龙杨晓雷叶琳丁磊明陶欢方江晓周正阳石博隆郭磊杭丽君边志伟何远彬韩其国
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO
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