CN108448579B - 一种适用于含谐波电压的单相系统容性无功电流提取方法 - Google Patents
一种适用于含谐波电压的单相系统容性无功电流提取方法 Download PDFInfo
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- CN108448579B CN108448579B CN201810201606.XA CN201810201606A CN108448579B CN 108448579 B CN108448579 B CN 108448579B CN 201810201606 A CN201810201606 A CN 201810201606A CN 108448579 B CN108448579 B CN 108448579B
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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
- 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
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
Description
技术领域
本发明属于电力系统领域,尤其涉及一种在存在谐波电压的单相系统中,提取负荷电流中容性无功电流分量的方法。
背景技术
单相交流系统中,负荷电流中的容性电流注入会降低负荷功率因数,还可能导致负荷侧电压幅值升高。因此,提取负荷电流中所含的容性电流分量对于负荷运行情况分析和电能质量治理有着重要的意义。目前常见的单相容性无功电流提取算法,通常采用傅里叶分解计算各频率电流分量幅值和相位,从而提取无功电流。这一方法精度较高,但当电压电流中存在谐波分量时,计算过程较为复杂。
发明内容
鉴于现有技术存在计算量大,流程复杂的不足,本发明的目的是提出一种新的容性无功电流提取方法,实现在单相系统供电电压包含谐波的情况下提取负荷电流所含基波和谐波频率的容性无功电流分量。本发明的技术方案如下:
一种应用于单相系统的负荷容性电流分量提取方法,包括下列步骤:
采集负荷瞬时电流i,负荷瞬时电压u;
本发明所提出的应用于单相系统的负荷容性电流检测方法,可在供电电压发生谐波畸变的情况下,计算负荷电流中基波和谐波容性电流分量的瞬时值。本方法由于不需进行傅里叶分解,计算过程较为简单;且由于可直接计算容性无功电流,避免了负荷电流中其他分量的对容性电流分量计算结果的干扰。
附图说明
图1容性电流提取算法流程图
图2实施例说明图
附图中及文字中各标号的含义
u为负荷电压瞬时值
i为负荷电流瞬时值
B为容性电流提取系数
ic为计算得到的容性负荷电流瞬时值
C为等效负荷电容,R为等效负荷电阻。
具体实施方式
下面结合附图2和实施例对本发明进行说明,具体如下:
(1)如图2所示,一容性负荷接入单相系统中,一般而言其可等效为电容负荷(其电容值为C),和电阻负荷(其电阻值为R)并联。考虑电网电压中除了基波含量外还含有谐波分量,负荷瞬时电压u表达式为:
u=U0cos(ω0t)+Uecos(ωet+θe)
其中U0为基波电压幅值,ω0为基波电压频率;Ue为谐波电压幅值,ωe为谐波电压频率,θe为谐波电压初相位。
根据负荷参数C和R,则负荷电流瞬时值i可表示为:
ia=(U0/R)cos(ω0t)+(Ue/R)cos(ωet+θe)
-CU0ω0sin(ω0t)-CUeωesin(ωet+θe)
ic=-CU0ω0sin(ω0t)-CUeωesin(ωet+θe)
对比i和ic表达式可知,根据本发明所提算法计算得到的容性电流分量ic为基波和谐波频率下的电容支路电流。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2659000Y (zh) * | 2003-11-21 | 2004-11-24 | 华南理工大学 | 一种可动态无功补偿的电力变压器 |
CN101986497A (zh) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | 磁悬浮列车电能质量控制补偿系统及控制方法 |
CN103777076A (zh) * | 2014-01-26 | 2014-05-07 | 国家电网公司 | 三相四线制系统任意次谐波分量和无功电流检测方法 |
CN105823921A (zh) * | 2016-06-01 | 2016-08-03 | 山东建筑大学 | 一种基于瞬时空间电压矢量定向的补偿电流检测方法 |
CN106814245A (zh) * | 2017-02-21 | 2017-06-09 | 昆明电器科学研究所 | 适用于三相三线制电路的无功功率计算方法 |
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FR2698741B1 (fr) * | 1992-11-30 | 1995-01-13 | Alpes Technologies | Compensateur statique à hystérésis. |
CN102854431B (zh) * | 2011-07-01 | 2014-11-19 | 上海思盛信息科技事务所 | 一种在线检测避雷器泄漏阻性电流的方法 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2659000Y (zh) * | 2003-11-21 | 2004-11-24 | 华南理工大学 | 一种可动态无功补偿的电力变压器 |
CN101986497A (zh) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | 磁悬浮列车电能质量控制补偿系统及控制方法 |
CN103777076A (zh) * | 2014-01-26 | 2014-05-07 | 国家电网公司 | 三相四线制系统任意次谐波分量和无功电流检测方法 |
CN105823921A (zh) * | 2016-06-01 | 2016-08-03 | 山东建筑大学 | 一种基于瞬时空间电压矢量定向的补偿电流检测方法 |
CN106814245A (zh) * | 2017-02-21 | 2017-06-09 | 昆明电器科学研究所 | 适用于三相三线制电路的无功功率计算方法 |
Non-Patent Citations (2)
Title |
---|
Study on harmonic and reactive current detection in single-phase circuit;Lei Xiao;《Conference on Industrial Electronics and Applications, Xi"an》;20091231;第2919-2923页 * |
关于瞬时无功功率理论的探讨;山霞;《高电压技术》;20060531;第100-102、110页 * |
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