High-speed harmonic current open-closed loop control method based on current prediction feedforward and multi-PR resonant branches
A current prediction and harmonic current technology, applied in AC network to reduce harmonic/ripple, circuit device, AC network circuit, etc., can solve the problem of low accuracy of steady-state compensation and reduce real-time performance of active filter harmonic pollution , rely on system models and other issues, to achieve the effect of improving dynamic performance, small amount of calculation, and simple system design
Active Publication Date: 2019-04-26
JIANGYIN ACREL ELECTRICAL APPLIANCE MFGCO +1
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Problems solved by technology
This greatly reduces the real-time performance of the active filter to control harmonic pollution
The relevant literature proposes a current tracking method using deadbeat control, which is essentially an open-loop control. Although this method can effectively increase the response speed of the APF system, it is too dependent on the system model, and the performance is closely combined with the system parameters and the steady-state Compensation accuracy is low
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0026] The present invention will be further described below in conjunction with the accompanying drawings.
[0027] Such as figure 1 Shown is the flow chart of the APF current loop control method of the present invention.
[0028] A high-speed harmonic current open-closed-loop control method based on current prediction feedforward combined with multiple PR resonance branches, the method is carried out as follows:
[0029] ① Load the APF parameters, including the inductance value at the grid-connected interface and the switching cycle of the APF;
[0030] ②Sampling k The current value of the grid-connected inductance and the grid voltage value at any time, and estimated according to the command current k The current value on the grid-connected inductor at +1 time i Lpred ,pass U pred The expression calculates the reference voltage gen...
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The invention discloses a high-speed harmonic current open-closed loop control method based on current prediction feedforward and multi-PR resonant branches, which is characterized in that a forward open-loop branch based on command current prediction is superposed on the multi-PR resonant branches to achieve open-closed loop control, and the dynamic performance of the current loop is improved, sothat the superimposed current loop can track the instruction current in time when the harmonic wave changes suddenly, and the response speed of the APF system is improved. The method can obviously improve the dynamic characteristic of the current loop on the premise of ensuring that the steady-state performance of the current loop is not influenced, and compared with a prior APF current loop control method, the method is simple in algorithm and easy to achieve, the method provides an effective technical support for the treatment of the harmonic wave treatment problem of the nonlinear impact load and has good feasibility and practical value.
Description
technical field [0001] The invention belongs to the field of power systems, and in particular relates to a high-speed harmonic current open-closed-loop control method based on current prediction feedforward combined with multiple PR resonance branches. Background technique [0002] Active Power Filter (APF) has gradually become the first choice for harmonic pollution control due to its advantages of high controllability and real-time response. With the continuous increase of nonlinear load harmonic pollution, facing the impact load with severe power changes and large fluctuations in each harmonic current, the dynamic and steady-state performance of APF harmonic control has become a research hotspot in this field in recent years. The current loop analysis and control of the APF system is related to the compensation accuracy and response speed of the whole system, which is a key technical problem to be overcome. [0003] The traditional APF current loop control usually adopts...
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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 季晓春赵军洪文瓞刘建春刘照清赵立坤周智鹏曹武
Owner JIANGYIN ACREL ELECTRICAL APPLIANCE MFGCO