Proportional resonance control method used for PWM converter and involving parameter optimization
A proportional resonance control and proportional resonance technology, which is applied in the direction of converting AC power input to DC power output, output power conversion device, reducing/preventing power oscillation, etc., can solve a large number of rotating coordinate transformations and PI regulator amplitude margins Low, difficult to achieve fast current command, no static difference adjustment, etc., to achieve the effect of facilitating engineering realization and improving the ability to ride through
Inactive Publication Date: 2015-01-07
STATE GRID CORP OF CHINA +4
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However, this type of current control scheme has two obvious shortcomings: 1) When the controlled current is unbalanced or harmonically distorted, the PI regulator has a low amplitude margin in the high-frequency part, and it is difficult to quickly and accurately control the current command. No static error adjustment; 2) In order to realize the transformation of AC sampling signal to DC quantity, and the inverse transformation of DC to AC quantity required before voltage command modulation, a large number of rotating coordinate transformations are required for digital implementation, which takes up a certain amount of computing resources
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[0035] The present invention will be further described below in conjunction with accompanying drawings and examples of implementation.
[0036] figure 1 It shows the control structure diagram of a PWM rectifier with a rated capacity of 5kW using the control method of the present invention. In the figure, U abc , I abc Respectively, the three-phase voltage at the input terminal of the filter reactor and the three-phase current at the input terminal of the filter reactor, Uα β is the two-phase voltage at the input terminal of the filter reactor in the static coordinate system, U dc is the terminal voltage of the DC link capacitor, is the voltage command of the DC bus capacitor, ΔU dc is the DC bus voltage error, is the active current command of the current loop, is the reactive current command of the current loop, is the synthesized current command of the current loop, is the reference current of the current loop, ΔI αβ is the current loop tracking error, E αβ is...
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The invention discloses a proportional resonance control method used for a PWM converter and involving parameter optimization. According to the method, implementation steps of a proportional resonance controller in the PWM converter are generally designed, and a parameter optimization method for the proportional resonance controller including multiple resonance controllers is provided. The method can meet the control requirements of the PWM converter under the ideal power grid condition and is especially suitable for traversing operational control over the PWM converter under complex power grid working conditions such as the unbalanced power grid voltage condition and the low-level power harmonic wave including condition, and therefore the fault power grid operating capacity of equipment is improved. The parameter design/optimization method for the PR controller is simple, convenient to implement and feasible, engineering implementation is facilitated, and the method can be conveniently transferred to application occasions such as PWM rectifiers, grid-connected inverters, active power filters and double-fed wind power converters.
Description
technical field [0001] The invention relates to a proportional resonance control method of a PWM converter involving parameter optimization, which is not only suitable for the effective control of PWM rectifiers, PWM inverters or other grid-connected converters under ideal grid conditions, but also can be used in unbalanced voltage conditions. , Harmonic distortion and other harsh grid environments to improve the fault ride-through operation capability of such grid-connected equipment. In particular, the present invention provides a parameter design method of a proportional resonance controller, which improves the engineering practicability of the control strategy. Background technique [0002] PWM converters are widely used in power active filters, uninterruptible power supplies, power drive systems and distributed power generation systems. Whether it is working in the rectification or inversion state, a key issue in the control of PWM converters is to ensure the no static...
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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/38H02M7/537Y02E10/76
Inventor 白恺宋鹏徐海亮刘少宇刘京波刘汉民马步云孙丹
Owner STATE GRID CORP OF CHINA
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