Stability enhancement control method for grid-connected converter under different output working conditions
A technology of enhanced control and converters, applied in the field of converters, can solve problems such as reducing dynamic response, failing to ensure stable operation of the system, increasing control complexity and calculation amount, etc., to achieve enhanced stability, avoid control mechanism and real-time Effect of measurement calculation, fast dynamic response
Pending Publication Date: 2022-01-07
CHONGQING UNIV
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Problems solved by technology
Such as feed-forward control and adaptive control, adding more than two proportional-integral controls to the original controller structure, while using additional sensors to monitor external variables, and calculate the corresponding controller parameters in real time according to changes in variables, which is undoubtedly Increased control complexity and computation, reduced dynamic response
Especially when the external working conditions change, such as output changes, the above strategy cannot guarantee the stable operation of the system in the whole working condition range
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[0032] The present invention is further described below in conjunction with the accompanying drawings of the description, as shown in the figure:
[0033] The stability enhancement control method of the grid-connected converter under different output conditions of the present invention includes the following steps:
[0034] S1. Perform coordinate transformation on the three-phase grid voltage to obtain the q-axis voltage V in the synchronous rotating coordinate system q ; where, as figure 1 As shown, the three-phase grid voltage v a , v b and v c After the Park coordinate transformation, the q-axis voltage V in the dq coordinate system is obtained q ;
[0035] S2. on the voltage V q Perform phase-locked loop proportional-integration processing to obtain variable δ q1 ;
[0036] S3. For the variable δ q1 and the power frequency angular frequency ω 1 Integrate the sum of , to obtain the phase-locked loop phase θ; among them, the power frequency angular frequency ω 1 U...
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The invention discloses a stability enhancement control method for a grid-connected converter under different output working conditions. The method comprises the steps of S1, carrying out the coordinate transformation of a three-phase power grid voltage, and obtaining a q-axis voltage Vq under a synchronous rotating coordinate system; S2, performing phase-locked loop proportional-integral processing on the voltage Vq to obtain a variable deltaq1; S3, integrating the sum of the variable delta q1 and the power frequency angular frequency omega 1 to obtain a phase-locked loop phase theta; S4, integrating the variable delta q1 to obtain an integrated result value, and performing high-pass filtering processing on the result value to obtain a phase harmonic component theta har; and S5, taking a difference value between the phase theta of the phase loop and the phase harmonic component theta har as a corrected phase theta 1, and taking the phase theta 1 as a phase parameter for converter control. According to the invention, the stability of the converter under different output working conditions can be guaranteed, and the response speed is higher.
Description
technical field [0001] The invention relates to the field of converters, in particular to a method for enhancing the stability of grid-connected converters under different output conditions. Background technique [0002] New energy sources such as wind power and photovoltaics are used worldwide due to their clean and renewable characteristics. However, the change of wind speed or the change of light intensity will lead to the change of new energy output, which may lead to the occurrence of harmonic voltages and currents at the grid connection point of the converter grid-connected system, which will affect the stability of the new energy grid-connected system. Some new energy units are offline, which seriously endangers the safe and stable operation of the power grid, causing a large number of equipment damage, regional power outages and other accidents. [0003] For the above stability problems, many studies have proposed different stability control strategies. Such as act...
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IPC IPC(8): H02J3/38H02J3/44H02J3/01
CPCH02J3/381H02J3/44H02J3/01H02J2300/24H02J2300/28Y02E10/56Y02E40/40
Inventor 杜雄刘俊良杜程茂张博谭尚宁卢新宇童程辉
Owner CHONGQING UNIV