CN103762596B - 一种链式有源电力滤波器的差异化控制方法 - Google Patents
一种链式有源电力滤波器的差异化控制方法 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
本发明涉及一种链式有源电力滤波器的差异化控制方法,将级联链节单元分为低频模块和高频模块;低频模块用于产生链式多电平逆变器需要输出的基波电压,高频模块用于产生链式多电平逆变器需要输出不包含低频模块输出基波电压的电压;按照周期循环方式,从级联链节单元中选取若干链节单元作为高频模块;在控制周期内,找出直流电容电压最高和最低的链节单元以及当前脉冲组合对直流电容放电最多和充电最多的链节单元,将直流电容电压最高的链节单元脉冲和对直流电容放电最多的链节单元脉冲对调,将直流电容电压最低的链节单元脉冲和对直流电容充电最多的链节单元脉冲对调。本发明可显著降低系统开关损耗,保证链节单元直流电容电压均衡和补偿效果。
Description
技术领域
本发明属于电力系统无功补偿和谐波治理技术领域,涉及一种链式有源电力滤波器的差异化控制方法。
背景技术
随着电力电子技术的发展,各种非线性电力电子装置在电力系统、工业、交通、楼宇自动化及家庭中获得了广泛的应用,并且其装置容量不断增大和控制方式多样化等,使得电网中电压和电流波形畸变越来越严重,电网中的谐波污染状况日益严重。有源电力滤波器(activepowerfilter,APF)成为目前研究和应用的热点。与传统无源电力滤波器相比,APF具有以下优点和特点:
1.具有多种补偿功能,不仅能够补偿各次谐波,还可以动态补偿无功功率和不平衡电流等;
2.滤波性能不受电网阻抗的影响,不会与电网阻抗发生串并联谐振;
3.谐波补偿特性不受电网频率变化的影响;
4.实现了谐波动态抑制,能够快速响应谐波的频率和大小发生的变化;
5.具有良好的性价比,一台APF可以完成多次谐波治理;
6.可以对一个谐波源单独治理,也可以同时对多个谐波源进行集中治理。
正因为APF具有很多优点和特点,越来越被用户接受和采用。1996年,F.Z.Peng和J.S.Lai等人在“AMultilevelvoltage-sourceinverterwithseparateDCsourceforStaticVarGeneration(IEEETransactionsonIndustryApplications,1996,32(5):1130-1138)”文中提出了链式多电平逆变器的拓补结构,将这种拓扑结构应用于APF中,构成链式有源电力滤波器可以显著提高APF装置的容量和耐压等级,具有广阔的应用前景。对于链式APF,要实现谐波治理功能,对开关器件的开关频率要求很高,如果提高所有器件的开关频率,极大地增加了系统的开关损耗,加重了冷却设备的负担,加大了系统的成本;同时链式APF中直流电容电压不均衡将威胁装置的安全运行。开关损耗和直流电容电压均衡控制是制约链式APF应用的瓶颈。
中国专利ZL200610113547.8和中国专利201110149521.X提供了链式APF直流电容电压均衡方法,为每个链节单元设置专门的直流电容电压控制算法,均压效果受控制参数影响大,均压过程容易出现超调和振荡。中国专利201010257367.3和中国专利200910238798.2提供了利用额外电路来实现链式APF的直流电容电压均衡,增加了系统成本和体积,同时也增加了控制复杂性。这些专利中没有涉及到开关器件采用不同开关频率。中国专利200810226449.4提出了一种差异化配置的电压质量综合调节装置,其主电路结构采用差异化配置的拓扑结构,需要对主电路中高频模块和低频模块进行分别设计。
发明内容
为解决现有技术中存在的上述问题,本发明提供一种链式有源电力滤波器的差异化控制方法,可显著降低系统的开关损耗,保证各链节单元直流电容电压均衡,同时不影响系统的补偿效果。
为解决上述技术问题,本发明采用如下技术方案:
一种链式有源电力滤波器的差异化控制方法,将链式多电平逆变器级联的链节单元按照开关频率分为低频模块和高频模块;在每个控制周期内,控制器都会计算出链式多电平逆变器需要输出的电压;将链式多电平逆变器需要输出的基波电压作为低频模块的输出目标,控制器为低频模块生成相应脉冲组合;将链式多电平逆变器需要输出不包含低频模块输出基波电压的电压作为高频模块的输出目标,控制器为高频模块生成相应脉冲组合。
进一步地,按照周期循环方式,从链式多电平逆变器级联的链节单元中选取没有被选为高频模块时间较久的链节单元作为高频模块的链节单元,其余链节单元作为低频模块的链节单元。
进一步地,在控制周期内找出链式多电平逆变器中直流电容电压最高和直流电容电压最低的链节单元以及当前脉冲组合对链节单元直流电容放电最多和充电最多的链节单元,将直流电容电压最高的链节单元脉冲和对直流电容放电最多的链节单元脉冲对调,将直流电容电压最低的链节单元脉冲和对直流电容充电最多的链节单元脉冲对调,最后将调整后的脉冲组合送给各个级联链节单元,去驱动相应的开关器件。
本发明的有益效果是:
1)采用低频模块输出链式多电平逆变器需要输出的基波电压;采用高频模块输出不包含低频模块输出基波电压的电压;低频模块和高频模块共同输出链式多电平逆变器需要输出的控制电压。因此该方法不影响系统的补偿效果。
2)高频模块无需特殊设计,高频模块按照一定周期在所有链节单元中循环选取,使得各链节单元开关平均损耗较为均匀,便于链节单元散热设计。
3)低频模块和高频模块中链节单元结构完全一致,便于模块化设计和生产。
4)在链式多电平逆变器需要输出的电压中,基波电压所占比重大,因此低频模块中链节单元数量较多,高频模块中链节单元数量较少,可有效降低系统的开关损耗。
5)链节单元直流电容电压均压算法简单、均压速度快,均压过程没有超调和振荡;对各链节单元的脉冲仅在次序上调整,因此不影响链式多电平逆变器的输出特性。
6)本发明方法原理还适用于链式多电平逆变器的其它应用场合,如静止同步补偿器(STATCOM)、静止无功发生器(SVG)、动态电压恢复器(DVR)等系统的差异化控制。
附图说明
附图是本发明一种链式有源电力滤波器的差异化控制方法实施例的结构示意图,其中:
1:控制器;
2:链式多电平逆变器;
3:电抗器;
4:高频模块;
5:链节单元。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。
如图1所示:
本发明实施例所述的一种链式有源电力滤波器的差异化控制方法的结构,包括有控制器1、一用于产生补偿电压的链式多电平逆变器2和一用于产生补偿电流的并与电网连接的电抗器3。根据电网无功功率补偿和谐波治理等方面的需要,控制器1计算出链式多电平逆变器需要产生的电压,链式多电平逆变器2产生该补偿电压,通过电抗器3后产生补偿电流,该电流注入到电网中,用于补偿电网中所需的无功电流和谐波电流等。所述链式多电平逆变器2由两级及以上的级联的链节单元5组成,其中链节单元采用H桥型逆变器并且所有链节单元结构相同。链式多电平逆变器2中的链节单元按照开关频率分为低频模块和高频模块;从链式多电平逆变器2中选取若干级联链节单元作为高频模块4的链节单元,其余链节单元作为低频模块的链节单元。低频模块中链节单元开关器件采用较低的开关频率,高频模块中链节单元开关器件采用较高的开关频率。较为优选情况下,高频模块包含级联链节单元数目少于低频模块包含级联链节单元数目。
本发明工作时,在每个控制周期内,控制器1都会计算出链式多电平逆变器2需要输出的电压;将链式多电平逆变器2需要输出的基波电压作为低频模块的输出目标,控制器1为低频模块生成相应脉冲组合;将链式多电平逆变器2需要输出不包含低频模块输出基波电压的电压作为高频模块4的输出目标,控制器1为高频模块4生成相应脉冲组合。
进一步地,按照周期循环方式,从链式多电平逆变器2级联链节单元中选取没有被选为高频模块时间较久的链节单元作为高频模块的链节单元,其余链节单元作为低频模块的链节单元。
进一步地,在控制周期内找出链式多电平逆变器2中直流电容电压最高和直流电容电压最低的链节单元以及当前脉冲组合对链节单元直流电容放电最多和充电最多的链节单元,将直流电容电压最高的链节单元脉冲和对直流电容放电最多的链节单元脉冲对调,将直流电容电压最低的链节单元脉冲和对直流电容充电最多的链节单元脉冲对调,最后将调整后的脉冲组合送给各个级联链节单元,去驱动相应的开关器件。
这样,本发明所述的链式有源电力滤波器控制方法采用差异化的控制方法,将链式多电平逆变器目标输出电压解耦为基波电压和谐波电压,分别由低频模块和高频模块中链节单元产生相应的电压;高频模块中链节单元按照一定周期在所有链节单元中循环选取,可使得各链节单元开关平均损耗较为均匀,便于链节单元散热设计;链式多电平逆变器需要输出的控制电压中基波电压所占比重大,因此低频模块中链节单元数量较多,高频模块中链节单元数量较少,可有效降低系统的开关损耗。同时链节单元直流电容电压均压方法对直流电容电压最高和直流电容电压最低的功率单元实施均压控制,原理简单,均压速度快,均压过程没有超调和振荡;对各链节单元的脉冲仅在次序上调整,因此不影响链式多电平逆变器的输出特性。
当然,本发明方法原理还适用于链式多电平逆变器的其它应用场合,如静止同步补偿器(STATCOM)、静止无功发生器(SVG)、动态电压恢复器(DVR)等系统中差异化控制。
以上所述是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进、修正和替换,这些改进、修正和替换也视为本发明的保护范围。
Claims (2)
1.一种链式有源电力滤波器的差异化控制方法,将链式多电平逆变器级联的链节单元按照开关频率分为低频模块和高频模块;在每个控制周期内,控制器都会计算出链式多电平逆变器需要输出的电压;将链式多电平逆变器需要输出的基波电压作为低频模块的输出目标,控制器为低频模块生成相应脉冲组合;将链式多电平逆变器需要输出不包含低频模块输出基波电压的电压作为高频模块的输出目标,控制器为高频模块生成相应脉冲组合;其特征在于:所述的低频模块和高频模块结构相同,按照周期循环轮流方式,从级联链节单元中选取没有被选为高频模块时间较久的链节单元作为高频模块的链节单元,其余链节单元作为低频模块的链节单元。
2.根据权利要求1所述的链式有源电力滤波器的差异化控制方法,其特征在于,在控制周期内找出链式多电平逆变器每相直流电容电压最高和直流电容电压最低的链节单元以及当前脉冲组合对链节单元直流电容放电最多和充电最多的链节单元,将直流电容电压最高的链节单元脉冲和对直流电容放电最多的链节单元脉冲对调,将直流电容电压最低的链节单元脉冲和对直流电容充电最多的链节单元脉冲对调,最后将调整后的脉冲组合送给各个级联链节单元,去驱动相应的开关器件。
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CN201410048458.4A CN103762596B (zh) | 2014-02-12 | 2014-02-12 | 一种链式有源电力滤波器的差异化控制方法 |
PCT/CN2014/000466 WO2015120568A1 (zh) | 2014-02-12 | 2014-05-06 | 一种链式有源电力滤波器的差异化控制方法 |
US15/100,980 US20160308357A1 (en) | 2014-02-12 | 2014-05-06 | Differentiated control method of the cascaded active power filter |
GB1609967.3A GB2539330A (en) | 2014-02-12 | 2014-05-06 | Method for differentially controlling chained active power filter |
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CN103762596B (zh) * | 2014-02-12 | 2016-03-09 | 陈峻岭 | 一种链式有源电力滤波器的差异化控制方法 |
EP3156861B1 (en) * | 2015-10-16 | 2018-09-26 | GE Renewable Technologies | Controller for hydroelectric group |
CN108233747B (zh) | 2016-12-16 | 2020-12-04 | 台达电子企业管理(上海)有限公司 | 模块化电源系统 |
US10727669B2 (en) * | 2017-01-27 | 2020-07-28 | Duke Energy Corporation | Apparatuses including power electronics circuitry, and related methods of operation |
CN107317343B (zh) * | 2017-08-24 | 2023-05-12 | 长沙理工大学 | 高效级联h桥型动态电压恢复器及其控制方法 |
CN109193692B (zh) * | 2018-10-08 | 2021-06-08 | 许继集团有限公司 | 一种链式svg及其直流侧电容电压均衡控制方法和装置 |
EP3713073A1 (de) * | 2019-03-19 | 2020-09-23 | Siemens Aktiengesellschaft | Stromrichter und verfahren zu dessen regelung |
CN109873424B (zh) * | 2019-04-17 | 2019-11-22 | 山东大学 | 一种混合式级联apf拓扑结构及其控制方法 |
US20200350833A1 (en) * | 2019-05-03 | 2020-11-05 | The Regents Of The University Of California | Pyramid-type multilevel converter topology |
CN110266017B (zh) * | 2019-05-23 | 2020-08-18 | 浙江工业大学 | 一种lcl型有源电力滤波器混合状态反馈虚拟阻尼控制方法 |
CN110247565B (zh) * | 2019-06-24 | 2020-05-08 | 燕山大学 | 级联型多电平变换器直流电容最小化方法 |
CN110492771B (zh) * | 2019-07-12 | 2021-08-10 | 上海大学 | 中点电荷最小的三电平逆变器优化脉冲方法 |
IT202000004768A1 (it) * | 2020-03-06 | 2021-09-06 | Dunamis S R L | Rifasatore statico ad onda sinusoidale per carichi induttivi |
JP7224531B2 (ja) * | 2020-03-17 | 2023-02-17 | 三菱電機株式会社 | 電力変換装置 |
EP4027506A1 (de) * | 2021-01-08 | 2022-07-13 | Siemens Energy Global GmbH & Co. KG | Stromrichter und verfahren zum betreiben des stromrichters |
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CN202183601U (zh) * | 2011-08-02 | 2012-04-04 | 中国电力科学研究院 | 一种差异化补偿的电气化铁路电能质量治理装置 |
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CN202183601U (zh) * | 2011-08-02 | 2012-04-04 | 中国电力科学研究院 | 一种差异化补偿的电气化铁路电能质量治理装置 |
CN103036238A (zh) * | 2012-12-24 | 2013-04-10 | 珠海万力达电气股份有限公司 | 一种链式有源电力滤波器链节单元旁路控制结构及方法 |
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