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Current control method and system of inverter
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A current control and current controller technology, applied in the field of control, can solve problems such as steady-state errors, achieve good dynamic performance, and achieve the effect of static error follow-up
Pending Publication Date: 2021-12-10
SHENZHEN HOPEWIND ELECTRIC CO LTD
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[0005] In view of this, the purpose of this application is to provide an inverter current control method and system to solve the existing single-phase inverters and two-phase orthogonal inverters that exist when PI control is used in the static coordinate system. The problem of steady state error
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Embodiment 1
[0037] The variables involved in the embodiment of this application and their definitions are as follows:
[0038] Amplitude of given current;
[0039] ω: the frequency of the given current;
[0040] θ: angle used for coordinate transformation;
[0041] The instantaneous value of the given current;
[0042] i L : single-phase output current value;
[0043] Δi L : The deviation between the given current and the single-phase output current;
[0044] Δi d : The deviation between the given current and the single-phase output current is converted to the current deviation on the d-axis;
[0045] Δi q : The deviation between the given current and the single-phase output current is converted to the current deviation on the q-axis;
[0046] K p : PI current controller proportional parameter on dq axis;
[0047] K i : Integral parameter of PI current controller on dq axis;
[0048] V d_PI : d-axis PI current controller output;
[0049] V q_PI : q-axis PI current cont...
Embodiment 2
[0086] The variables involved in the embodiment of this application and their definitions are as follows:
[0087] ω: the frequency of the given current;
[0088] θ: angle used for coordinate transformation;
[0089] d-axis given current
[0090] q-axis given current
[0091] i α : A phase output current value
[0092] i β : Phase B output current value
[0093] i d : output current i α i β Transform to the d-axis component in the rotating coordinate system
[0094] i q : output current i α i β Transform to the q-axis component in the rotating coordinate system
[0095] Δi d : d-axis current deviation
[0096] Δi q : q-axis current deviation
[0097] K p : PI current control unit proportional parameter
[0098] K i : PI current control unit integral parameter
[0103] d a : Duty cycle of the upper tube of the firs...
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Abstract
The invention discloses a current control method and system of an inverter. The current control method comprises the following steps of: determining a deviation between a given current and a single-phase output current; taking the deviation between the given current and the single-phase output current as an alpha-axis input quantity of a static coordinate system, and setting a beta-axis input quantity of the static coordinate system as 0; and after the conversion from the static coordinate system to a rotating coordinate system, obtaining a dq-axis current deviation under the rotating coordinate system, and controlling a single-phase inverter after the adjustment of a PI current controller. Under the condition that a power grid is weak, when the PI current controller is adopted for control, no static error following exists between the given current and the feedback current, and the dynamic performance is good.
Description
technical field [0001] The present application relates to the field of control technology, in particular to a current control method and system for an inverter. Background technique [0002] Due to its simple structure, flexible modulation strategy, and bidirectional energy flow, single-phase inverters are widely used in photovoltaic power generation, electromagnetic stirring, and vehicle charging. [0003] At present, the control method of the single-phase inverter is mainly realized in the static coordinate system, and the reference and feedback are both sinusoidal, and the selected PI controller has a steady-state error for the sine wave reference. For some occasions such as electromagnetic mixers, it is required to output two-phase currents, and the phase difference of the two-phase currents is 90°. If the two-phase currents are controlled separately in the static coordinate system, there will still be a steady state between the actual current and the given current. Err...
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