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A control method for steady-state frequency adjustment of inverters using power coordinate transformation

A technology of coordinate transformation and non-difference adjustment, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Deviation and other problems to achieve the effect of eliminating steady-state frequency deviation and small frequency deviation

Active Publication Date: 2018-09-07
云南电网有限责任公司电网规划研究中心
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Problems solved by technology

[0004] The technical problem aimed at by the present invention is to simultaneously solve the problem of sharing active power and reactive power according to the proportion of inverter capacity and steady-state frequency deviation when the inverters are running in parallel

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  • A control method for steady-state frequency adjustment of inverters using power coordinate transformation
  • A control method for steady-state frequency adjustment of inverters using power coordinate transformation
  • A control method for steady-state frequency adjustment of inverters using power coordinate transformation

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Embodiment Construction

[0011] Using power coordinate transformation to realize the control method of inverter steady-state frequency adjustment without difference, the feature of the present invention is to select the virtual impedance according to the load average power factor; select the virtual impedance angle to make it equal to the load average power factor angle; according to the virtual Impedance angle transforms the coordinates of the active and reactive loads of the inverter to obtain the generalized active power P d and generalized reactive Q d ; Implement droop control P for generalized active power d -f, select the droop coefficient according to the inverse ratio of the inverter capacity, and select the virtual impedance according to the inverse ratio of the inverter capacity.

[0012] The present invention is specifically:

[0013] The power transfer characteristics of inverters running in parallel are as follows: figure 1 As shown, M is the inverter parallel connection point, and N ...

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Abstract

The invention discloses a control method for realizing steady-state frequency no-deviating regulation of an inverter by utilizing power coordinate transform. The control method is characterized by comprising: selecting virtual impedance according to a load average power factor; selecting a virtual impedance angle which is equal to a load average power factor angle; carrying out coordinate transform on active load and reactive load of the inverter according to the virtual impedance angle so as to obtain generalized active load Pd and generalized inactive load Qd; carrying out droop control on the generalized active load, selecting a droop coefficient according to an inverse ratio of inverter capacity, and selecting virtual impedance according to the inverse ratio of inverter capacity. The method has the beneficial effects that the active load and the reactive load can be shared according to a capacity ratio without relying on the communication between inverters, thereby ensuring that frequency deviation in a dynamic process is extremely small, and almost eliminating steady state frequency deviation.

Description

technical field [0001] The invention relates to a control method for parallel operation of inverters, in particular to a control method for realizing proportional sharing of active and reactive loads of inverters and no-difference adjustment of steady-state frequency by using power coordinate transformation. Background technique [0002] There are multiple inverters running in parallel in UPS parallel redundant system or microgrid. The control algorithm of inverter parallel operation has important application prospects in the above fields. The ideal goal of inverter parallel operation is: each inverter operates according to The proportion of its capacity bears active and reactive loads, and the voltage and frequency deviation is zero. Droop control is an important control algorithm for parallel operation of inverters. It does not require communication, but there is a steady-state frequency deviation in droop control, and it cannot achieve proportional sharing of active and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493
Inventor 王文玺程军照黄梅刘宝林冯磊
Owner 云南电网有限责任公司电网规划研究中心
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