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Control method for inhibiting offset of transient virtual power angle curve of drop-controlled inverter

A control method and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of the decrease of inverter transient stability margin and the influence of inverter voltage Tracking performance, virtual power angle curve offset and other issues, to achieve the effect of improving the stability of large disturbances, improving transient tracking performance, and suppressing transient offsets

Active Publication Date: 2016-02-24
ZHEJIANG UNIV
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Problems solved by technology

[0005] In order to solve the background technology, because the three-loop control (droop control-voltage outer loop-current inner loop) affects the voltage tracking performance of the inverter, the virtual power angle curve will shift during the transient process, resulting in inverter To solve the technical problem of transient stability margin decline, the present invention proposes a control method for suppressing the deviation of the transient virtual power angle curve of the inverter by droop control, so as to control the deviation of the transient virtual power angle curve of the inverter and improve the efficiency of the inverter. Transformer Transient Stability

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  • Control method for inhibiting offset of transient virtual power angle curve of drop-controlled inverter
  • Control method for inhibiting offset of transient virtual power angle curve of drop-controlled inverter
  • Control method for inhibiting offset of transient virtual power angle curve of drop-controlled inverter

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specific Embodiment

[0095] The embodiment incorporates a single inverter into an infinite system (such as figure 1 (Shown) as an example, take a single-machine infinity system for simulation, the current adopts the d-axis current priority limiting method, and its limiting value is I max =1.05, the remaining parameters used in the simulation are shown in Table 2 of the attached drawing. Inverter with P 0 = 0.3 start, at t = 3s, P 0 Step to 1.0, and use the droop control strategy without output current feedforward as the control group to test the transient performance of the proposed control method.

[0096] Table 2 Parameter values ​​of some system variables in the simulation verification of the embodiment

[0097]

[0098]

[0099] When adopting the method of adding inverter output current feedforward control, Figure 9-13 The transient response of the inverter when different current feedforward coefficients are used is given, with F=0, that is, no current feedforward as the control group. It can be...

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Abstract

The invention discloses a control method for inhibiting the offset of a transient virtual power angle curve of a drop-controlled inverter. A feedforward parameter adding method is adopted for calculating an output current of the inverter and carrying out feedforward control on the output current, so that the voltage tracking performance of the inverter is improved, and the transient stabilization of the inverter is kept. Two feedforward output voltage estimated values are added to two current reference values generated by original voltage outer rings of the inverter, so that neo current reference values are obtained. By adopting the method, the transient tracking performance of the voltage is improved, the transient offset of the virtual power angle curve is effectively inhibited, additional sensors are not needed, and the good transient state and the small interference performance of the system are ensured; in addition, the method can be applied to inverters under dual-loop control such as a virtual synchronous machine, the method can also be further popularized to large interference scenes such as multi-machine passive isolated grids and isolated grid large-load switching, and the transient stabilization of the system is improved.

Description

Technical field [0001] The invention relates to an inverter control method, in particular to a control method for suppressing droop and controlling the deviation of the transient virtual power angle curve of the inverter Background technique [0002] In recent years, renewable energy sources such as wind power and photovoltaics have developed rapidly. Large-scale wind power and photovoltaic power plants with inverters as the interface have been established in China. Therefore, the stability of inverters is of great significance to the safe operation of the power grid. [0003] The droop control makes the inverter present the characteristics of a voltage source, which is widely used in practice, especially when new energy sources are connected to a micro grid or a weak grid. The droop control can provide voltage and frequency support for the system. Studies have shown that under large disturbances, droop-controlled inverters have similar power angle characteristics to traditional sy...

Claims

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Application Information

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IPC IPC(8): H02M7/493H02J3/38
Inventor 辛焕海章雷其黄林彬乐程毅甘德强
Owner ZHEJIANG UNIV
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