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Control system and control method of three-phase independent control grid inversion

A technology of independent control and inverter control, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as complex control modulation methods, achieve the effect of simplifying control modulation methods and improving phase-locking accuracy

Inactive Publication Date: 2012-10-03
ZTE QUANTUM
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Problems solved by technology

The control modulation method is relatively complex

Method used

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  • Control system and control method of three-phase independent control grid inversion
  • Control system and control method of three-phase independent control grid inversion
  • Control system and control method of three-phase independent control grid inversion

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Experimental program
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Embodiment Construction

[0028] The following is attached figure 1 , attached figure 2 The specific implementation of the three-phase independent control grid-connected inverter control system with transformer will be further described.

[0029] Establishment of three-phase grid-connected inverter system model with transformer

[0030] The invention provides a three-phase independent control grid-connected inverter control system with transformer based on figure 1 The above-mentioned three-phase grid-connected inverter system model with transformer. It is composed of PV input 1, inverter 2, filter 3, and transformer 4, and the output is directly connected to the grid.

[0031] Combination of DQ phase-locked loop and three-phase independent control

[0032] In the first step, DQ phase-locking is based on the three-phase system closed-loop phase-locking of synchronous rotating coordinate system transformation. Such as figure 2 As mentioned above, the three-phase mains is first transformed by abc...

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PUM

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Abstract

The invention discloses a control system and a control method of three-phase independent control grid inversion, wherein the control method of the three-phase independent control grid inversion comprises the steps: 1, error information between an electric supply phase angle and a lock phase angle is obtained by a DQ lock phase based on a closed ring lock phase of the three-phase system of a synchronous rotation coordinate system; 2, the voltage ring adopts comparison between the input voltage and the reference voltage; the obtained error signal is used as a current loop reference after being controlled and outputted by PI to perform PI control; 3, the electric supply valid value and the angle of the single-phase DQ lock phase are combined to replace the electric supply to generate a new front feed signal; and 4, the output of the current loop control and the quantity of the front feed control are used as final output quantity to be used as a modulation signal of SPWM (sinusoidal pulse width modulation) modulation so as to drive the inverter, therefore, the whole three-phase grid inverse system can run.

Description

technical field [0001] The invention belongs to the field of inverter control systems based on high-power solar energy, and in particular relates to a three-phase independent control grid-connected inverter control system. Background technique [0002] With the continuous development of the economy, energy and environmental issues have become increasingly prominent. In order to achieve sustainable development of energy and environment, all countries have increased investment in new energy. In the long run, solar photovoltaic power generation will occupy an important seat in the world's energy consumption in the near future, not only to replace some conventional energy sources, but also to become the main body of the world's energy supply. At the same time, as the application of power electronic devices becomes more and more extensive, their existence enables the effective use of electric energy, but their own nonlinearity also distorts the current and voltage of the power g...

Claims

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Application Information

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IPC IPC(8): H02J3/40
Inventor 庄书琴
Owner ZTE QUANTUM
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