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A control method for a grid-connected inverter without an AC voltage sensor

A technology of AC voltage and control method, which is applied in the direction of converting AC power input into DC power output, electrical components, and single-grid parallel feeding arrangement, etc. The effect of simplifying the design and reducing the difficulty of parameter adjustment

Active Publication Date: 2021-10-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides a control method for a grid-connected inverter without an AC voltage sensor, the purpose of which is to solve the problem of factors such as measurement noise, integral initial value or grid frequency affecting the real-time estimation of grid voltage Accuracy problem, and then improve the phase-locked dynamic performance and steady-state accuracy of the grid-connected inverter

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  • A control method for a grid-connected inverter without an AC voltage sensor
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  • A control method for a grid-connected inverter without an AC voltage sensor

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[0056] 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. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0057] figure 1 It is a flow chart of a grid-connected inverter without an AC voltage sensor control method provided in this embodiment, figure 2 is the overall block diagram of the grid-connected inverter control system provided by this embodiment; see figure 1 , 2 , the control method mainly includes the following steps:

[0058] S1: According to the d-axis and q-axis current state equati...

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Abstract

The invention discloses a method for controlling a grid-connected inverter without an AC voltage sensor. The d-axis and q-axis components of the output current of the grid-connected inverter and the d-axis and q-axis components of the output voltage use the extended state observer to obtain the estimated value of the grid voltage and complete phase locking; according to the current command value and the error proportional coefficient And the output of the expanded state observer calculates the control quantity of the output voltage of the grid-connected inverter, calculates the drive signal of the switch tube of each bridge arm of the inverter based on the control quantity, and inputs the drive signal of the switch tube into the grid-connected inverter to control the grid-connected inverter. Vector control is performed on the d-axis and q-axis components of the current; the present invention does not involve direct differential or integral operations when estimating the grid voltage, so that it does not need to consider the influence of measurement noise, integral initial value, etc. on angle estimation, and can obtain a more ideal Phase-locked and grid-connected current control effects.

Description

technical field [0001] The invention belongs to the technical field of grid-connected inverter control, and more specifically relates to a control method for a grid-connected inverter without an AC voltage sensor. Background technique [0002] The inverter can convert DC power into AC power, and is the core equipment in the new energy grid-connected power generation system. Among the various topologies of grid-connected inverters, the L-filtered voltage source three-phase inverter has been widely used due to its advantages of simple structure, bidirectional energy flow, and three-phase balanced power transmission to the grid. Since the grid-connected power factor directly depends on the phase relationship between the inverter output current and the grid voltage, in order to realize the control of the grid-connected active and reactive power, it is necessary to detect the phase of the grid voltage in real time. [0003] In a general grid-connected inverter system, a DC volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/44H02M1/088H02M7/5387
CPCH02J3/38H02J3/44H02M1/088H02M7/53871H02J2300/20H02M1/0025
Inventor 杨凯王兴张伟健辜承林李健熊飞
Owner HUAZHONG UNIV OF SCI & TECH
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