CN104569551A - DC component detecting method applied to inversion voltages - Google Patents
DC component detecting method applied to inversion voltages Download PDFInfo
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- CN104569551A CN104569551A CN201510006845.6A CN201510006845A CN104569551A CN 104569551 A CN104569551 A CN 104569551A CN 201510006845 A CN201510006845 A CN 201510006845A CN 104569551 A CN104569551 A CN 104569551A
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Abstract
The invention relates to a DC component detecting method applied to inversion voltages. The method comprises the steps that first, a full-bridge inversion high-frequency drive effective duty cycle oscillogram is drawn; second, when the i<th> sine period is in a positive half cycle, the positive grade cumulative sum A (i) of the effective duty cycles of a control waveform from the first control period to the n/2<th> control period and positive bus-bar voltages is calculated; third, when the i<th> sine period is in a negative half cycle, the positive grade cumulative sum B (i) of the effective duty cycles of the control waveform from the (n/2+1)<th> control period to the n<th> control period and negative bus-bar voltages is calculated; fourth, the difference of the positive product cumulative sum A (i) and the negative product cumulative sum B (i) is calculated, and the difference is namely the DC offset P(i) of the i<th> sine period; fifth, the DC offsets from the first sine period to the m<th> sine period are cumulated, namely, the DC offsets of the inversion voltages :P are acquired. According to the DC component detecting method, extra hardware circuits are of no need, errors can be reduced, and the offset generated by directly using the duty cycles is avoided.
Description
Technical field
The present invention relates to a kind of DC component detection method being applied to inverter voltage.
Background technology
What sinewave inverter exported is alternating voltage, but also comprises certain dc component.If dc component is bigger than normal, for being similar to for inductive load, there is harm, transformer such as can be made to produce magnetic bias, cause the running noises of transformer and mechanical vibration sharply to increase, transformer bias can be caused under serious conditions full and damage.The alternating voltage DC component of ideal situation should be zero, but in the control technology of modern inverter, a lot of reasons can cause there is certain dc component in the alternating voltage of inversion, as long as we control this DC component in very little scope, the impact caused the load of inverter end is also substantially negligible.In the alternating voltage causing inverter to export, the reason of DC component size has a lot, the inconsistency of the busbar voltage in such as main power circuit, the internal resistance of inverse switch pipe; The inconsistency of the rising edge negative edge of drive singal, the inconsistency in upper underarm inverse switch pipe dead band; The drift of the operational amplifier of control circuit, sample circuit error etc., all can cause the change of DC component in inverter voltage.
Inverter voltage is normally extracted the flip-flop in interchange by the technology of existing detection inverter voltage DC component by larger RC filtering wave by prolonging time, through operational amplifier, this DC component is amplified again, carry out again sampling or participating in closed loop adjustment directly, thus eliminate or reduce the DC component in inverter voltage.The method needs hardware to increase extra DC component detection circuit, and accuracy of detection can affect by factors such as the temperature drifts of the devices such as power supply precision, amplifier, capacitance-resistance in hardware circuit.
Also have a kind of method to be the integration carried out for the high-frequency drive dutycycle controlling inversion pipe in a sinusoidal cycles, after continuing cumulative multiple sinusoidal cycles dutycycle integrated value, indirectly judged the DC component of inverter voltage by this anomalous integral.The method is not by the impact of hardware circuit parameter discrete, but can affect by the DC bus-bar voltage of inverter, when the bus voltage value of positive and negative half-wave is unequal in a sinusoidal cycles, there is certain deviation by dutycycle integration cumulative sum out with actual output voltage DC component.
Summary of the invention
For above technical background mention the shortcoming of existing scheme, the invention provides a kind of DC component detection method being applied to inverter voltage, additionally mustn't increase hardware and by the impact that positive and negative half-wave bus voltage value is inconsistent.
For achieving the above object, the present invention adopts following technical scheme: a kind of DC component detection method being applied to inverter voltage, is characterized in that comprising the following steps: the first step: obtain inversion sine wave output shape
and HF switch pipe control waveform S1, S2, S3 and S4, draw full-bridge inverting high-frequency drive effective duty cycle oscillogram;
Second step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in positive half cycle, calculates the effective duty cycle of described control waveform the 1 to the n-th/2 control cycles respectively
with positive bus-bar voltage
positive product accumulation and:
;
3rd step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in negative half period, calculates the effective duty cycle of described control waveform n-th/2+1 to the n-th control cycle respectively
with negative busbar voltage
negative product accumulation and:
;
4th step: calculate described positive product accumulation and
with negative product accumulation and
difference be the DC offset of i-th sinusoidal cycles:
;
5th step: add up the 1st to the DC offset of m sinusoidal cycles and be the DC offset of inverter voltage:
; Wherein m, n are positive integer, and m is the periodicity of sine wave output, and n is even number, and the value of n equals the switching frequency of inverse control system.
The present invention compared with prior art has following beneficial effect:
1, the present invention is without the need to additionally increasing the hardware circuit of inverter voltage DC component detection, cost-saving;
2, the present invention is directly completed by software algorithm in digitial controller, the impact of the metrical error therefore do not brought along with factors such as environment temperatures by hardware detecting circuit;
3, when the deviation that in positive and negative half wave cycles, busbar voltage is inconsistent brought when the present invention can avoid directly adopting dutycycle integration.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is full-bridge inverting topological diagram of the present invention.
Fig. 3 is full-bridge inverting high-frequency drive effective duty cycle oscillogram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Please refer to Fig. 1, the invention provides a kind of DC component detection method being applied to inverter voltage, it is characterized in that comprising the following steps: the first step: obtain inversion sine wave output shape
and HF switch pipe control waveform S1, S2, S3 and S4, draw full-bridge inverting high-frequency drive effective duty cycle oscillogram (as shown in Figure 3);
Second step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in positive half cycle, calculates the effective duty cycle of described control waveform the 1 to the n-th/2 control cycles respectively
with positive bus-bar voltage
positive product accumulation and:
, Fig. 3 medium-high frequency switching tube S1 is in part in the positive half cycle of the sinusoidal cycles corresponding time period and is effective duty cycle part;
3rd step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in negative half period, calculates the effective duty cycle of described control waveform n-th/2+1 to the n-th control cycle respectively
with negative busbar voltage
negative product accumulation and:
, Fig. 3 medium-high frequency switching tube S2 is in part in the sinusoidal cycles negative half period corresponding time period and is effective duty cycle part;
4th step: calculate described positive product accumulation and
with negative product accumulation and
difference be the DC offset of i-th sinusoidal cycles:
;
5th step: add up the 1st to the DC offset of m sinusoidal cycles and be the DC offset of inverter voltage:
; Wherein m, n are positive integer, and m is the periodicity of sine wave output, and the value of n equals the switching frequency of inverse control system.
As shown in Figure 2, in full bridge inverter, described positive bus-bar voltage
equal described negative busbar voltage
.
In order to allow those skilled in the art better understand technical scheme of the present invention, below in conjunction with a specific embodiment, the present invention is described in detail.
When inverter voltage to be measured has 5 sinusoidal cycles, each sinusoidal cycles has 400 control cycles, i.e. m=5, n=400.
Get the 1st sinusoidal cycles, when it is in positive half cycle, calculate the effective duty cycle of described control waveform the 1st to the 200th control cycle respectively
with positive bus-bar voltage
positive product accumulation and:
;
When it is in negative half period, calculate the effective duty cycle of described control waveform the 201st to the 400th control cycle respectively
with negative busbar voltage
negative product accumulation and:
;
Calculate described positive product accumulation and
with negative product accumulation and
difference be the DC offset of the 1st sinusoidal cycles:
;
Get the 2nd to the 5th sinusoidal cycles to carry out said process respectively and can try to achieve respectively
, the DC offset of 5 sinusoidal cycles is added up and is the DC offset of inverter voltage:
.The size of inverter voltage generation direct current offset can be judged according to the size of P value.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (1)
1. be applied to a DC component detection method for inverter voltage, it is characterized in that comprising the following steps:
The first step: obtain inversion sine wave output shape
and HF switch pipe control waveform S1, S2, S3 and S4, draw full-bridge inverting high-frequency drive effective duty cycle oscillogram;
Second step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in positive half cycle, calculates the effective duty cycle of described control waveform the 1 to the n-th/2 control cycles respectively
with positive bus-bar voltage
positive product accumulation and:
;
3rd step: i-th sinusoidal cycles of getting described inversion sine wave output shape, when described i-th sinusoidal cycles is in negative half period, calculates the effective duty cycle of described control waveform n-th/2+1 to the n-th control cycle respectively
with negative busbar voltage
negative product accumulation and:
;
4th step: calculate described positive product accumulation and
with negative product accumulation and
difference be the DC offset of i-th sinusoidal cycles:
;
5th step: add up the 1st to the DC offset of m sinusoidal cycles and be the DC offset of inverter voltage:; Wherein m, n are positive integer, and m is the periodicity of sine wave output, and n is even number, and the value of n equals the switching frequency of inverse control system.
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| CN201510006845.6A CN104569551B (en) | 2015-01-08 | 2015-01-08 | A kind of DC component detection method being applied to inverter voltage |
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| CN201510006845.6A CN104569551B (en) | 2015-01-08 | 2015-01-08 | A kind of DC component detection method being applied to inverter voltage |
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| CN104569551B CN104569551B (en) | 2016-03-23 |
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Cited By (3)
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| CN105162229A (en) * | 2015-08-25 | 2015-12-16 | 北京普罗斯托国际电气有限公司 | Inverter and control method thereof |
| CN112379164A (en) * | 2020-12-04 | 2021-02-19 | 厦门市爱维达电子有限公司 | Direct-bias real-time sampling algorithm for digital UPS (uninterrupted Power supply) control variable sampling |
| CN117155088A (en) * | 2023-10-30 | 2023-12-01 | 深圳鹏城新能科技有限公司 | Off-grid voltage direct current component control method and device and electronic equipment |
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| US20050058221A1 (en) * | 2002-02-01 | 2005-03-17 | Gunnar Wetzker | Additive dc component detection included in an input burst signal |
| CN101950985A (en) * | 2010-11-01 | 2011-01-19 | 上海兆能电力电子技术有限公司 | Method for suppressing output harmonic wave and direct current component of single-phase grid-combined photovoltaic inverter |
| CN102436810A (en) * | 2011-10-26 | 2012-05-02 | 华南理工大学 | Record replay attack detection method and system based on channel mode noise |
| CN102998527A (en) * | 2012-11-26 | 2013-03-27 | 上海电力学院 | Pass band type fundamental wave, harmonic wave and direct current component detection method |
| CN103036248A (en) * | 2011-10-10 | 2013-04-10 | 艾伏新能源科技(上海)股份有限公司 | Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method |
| CN202929087U (en) * | 2012-09-17 | 2013-05-08 | 比亚迪股份有限公司 | Direct current component detection device |
| CN103490631A (en) * | 2013-09-16 | 2014-01-01 | 电子科技大学 | DC-DC converter |
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2015
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Patent Citations (7)
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| US20050058221A1 (en) * | 2002-02-01 | 2005-03-17 | Gunnar Wetzker | Additive dc component detection included in an input burst signal |
| CN101950985A (en) * | 2010-11-01 | 2011-01-19 | 上海兆能电力电子技术有限公司 | Method for suppressing output harmonic wave and direct current component of single-phase grid-combined photovoltaic inverter |
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| CN105162229A (en) * | 2015-08-25 | 2015-12-16 | 北京普罗斯托国际电气有限公司 | Inverter and control method thereof |
| CN112379164A (en) * | 2020-12-04 | 2021-02-19 | 厦门市爱维达电子有限公司 | Direct-bias real-time sampling algorithm for digital UPS (uninterrupted Power supply) control variable sampling |
| CN117155088A (en) * | 2023-10-30 | 2023-12-01 | 深圳鹏城新能科技有限公司 | Off-grid voltage direct current component control method and device and electronic equipment |
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| CN104569551B (en) | 2016-03-23 |
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Effective date of registration: 20210930 Address after: 363000 No. 11, Jinxing Road, Xiangcheng District, Zhangzhou City, Fujian Province Patentee after: Zhangzhou Kehua Electric Technology Co.,Ltd. Address before: 363000 Zhangzhou Kehua Technology Co., Ltd., Beidou Industrial Park, Jinfeng Industrial Zone, Zhangzhou City, Fujian Province Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |
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