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SVPWM control method for energy storage current transformer

A technology of energy storage converters and control methods, which is applied in the direction of output power conversion devices and electrical components, can solve problems such as the influence of converter performance indicators, energy storage converter electromagnetic interference conduction, and disturbance noise, and achieve Improve the effect of uniformity of electromagnetic interference and EMI radiation

Active Publication Date: 2015-12-02
厦门科华数能科技有限公司
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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a SVPWM control method for energy storage converters, which solves the problems of high switching frequency and harmonic noise that are unavoidable in the prior art SVPWM control, and at the same time avoids the The influence of SVPWM control on the performance index of the converter under light load conditions, and improved the electromagnetic interference of the energy storage converter, especially the conduction disturbance noise problem

Method used

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  • SVPWM control method for energy storage current transformer

Examples

Experimental program
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Embodiment 1

[0046] In the step S6, the specific implementation method of enabling the frequency jitter control of the three-phase inverter SVPWM of the energy storage converter is as follows: setting the frequency jitter period of the three-phase inverter SVPWM of the energy storage converter T=0.05 / f sw1 The interval where the discharge power level η is located [η set ,1] divided into 4 intervals in order from low to high, where η set = 0.2, [0.2, 0.4), [0.4, 0.6), [0.6, 0.8), [0.8, 1], f sw1 For the control reference frequency of the three-phase inverter SVPWM of the energy storage converter, set the corresponding frequency jitter range [-0.025f in the interval of the corresponding discharge power level η sw1 ,0.025f sw1 ], [-0.05f sw1 ,0.05f sw1 ], [-0.075f sw1 ,0.075f sw1 ], [-0.1f sw1 ,0.1f sw1 ], the jitter mode adopts a given discrete sequence modulation; according to the discharge power level interval where the discharge power level η of the three-phase inverter SVPWM co...

Embodiment 2

[0055] Wherein, the frequency jitter control of the three-phase inverter SVPWM of the energy storage converter is turned on in step S6, and the specific implementation method is: setting the frequency jitter period of the three-phase inverter SVPWM of the energy storage converter T=0.05 / f sw1 The interval where the discharge power level η is located [η set ,1] divided into three intervals in order from low to high, where η set =0.25, [0.25, 0.5), [0.5, 0.75), [0.75, 1], f sw1 For the control reference frequency of the three-phase inverter SVPWM of the energy storage converter, set the corresponding frequency jitter range [-0.03f in the interval of the corresponding discharge power level η sw1 ,0.03f sw1 ], [-0.06f sw1 ,0.06f sw1 ], [-0.09f sw1 ,0.09f sw1 ], the jitter mode adopts a given discrete sequence modulation; according to the discharge power level interval where the discharge power level η of the three-phase inverter SVPWM control cycle of the current energy stor...

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Abstract

The invention relates to an SVPWM control method for an energy storage current transformer, and the method comprises the following steps: collecting the three-phase voltage and current, the voltage of the storage unit and a charging current; calculating the level of discharge power of the energy storage current transformer if the energy storage current transformer is at a state of discharge; turning off the frequency jitter control of three-phase inversion SVPWM if the level of discharge power is lower than a threshold value of the level of discharge power, or else turning on the frequency jitter control of three-phase inversion SVPWM; turning off the frequency jitter control of three-phase inversion SVPWM if the energy storage current transformer is at a state of charge and the voltage of the energy storage unit is greater than a voltage threshold value, or else calculating the level of the charging current of the energy storage current transformer; turning off the frequency jitter control of three-phase inversion SVPWM if the level of the charging current of the energy storage current transformer is lower than a threshold value of the level of the charging current, or else turning on the frequency jitter control of three-phase inversion SVPWM. The method solves a problem that SVPWM control in the prior art has to be higher in switching frequency and n-th harmonic noises, avoids impact on performance indexes of the current transformer under the condition of light load, and improves electromagnetic interference.

Description

technical field [0001] The invention relates to a SVPWM control method of an energy storage converter. Background technique [0002] The energy storage converter is the energy storage link in the smart grid, which can effectively regulate power resources, balance the difference in power consumption between day and night and different seasons, adjust the surplus and shortage, and ensure the safety of the power grid. At present, most three-phase energy storage converters are controlled by SPWM or SVPWM, and there is electromagnetic interference. The existing method is mainly to add larger EMI filters on the DC side and the AC side of the converter, which not only increases the volume of the converter, but also increases the cost. Contents of the invention [0003] In view of this, the purpose of the present invention is to provide a SVPWM control method for energy storage converters, which solves the problems of high switching frequency and harmonic noise that are unavoidab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44
Inventor 黄超曾春保许林毅
Owner 厦门科华数能科技有限公司
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