CN104701854B - 一种含svg时电网pcc电压超调量的计算方法 - Google Patents
一种含svg时电网pcc电压超调量的计算方法 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
本发明公开了一种含SVG时电网PCC电压超调量的计算方法,监测投入SVG前电网中电流I、补偿支路中SVG应补偿电流iq、电网PCC电压、母线电压以及输电线路上阻抗Z,在已知SVG控制系统参数电流采样周期、PI调节器比例系数、桥路PWM等效增益以及输出电感的条件下,通过计算,预测出投入SVG时刻电网PCC电压超调量,为SVG控制系统的设计以及在电网中的安装位置提供参考。
Description
技术领域
本发明涉及一种含SVG(静止无功发生器)时电网PCC(公共连接点)电压超调量的计算方法,属于电能质量领域。
背景技术
随着现代工业技术的发展,计算机、自动控制技术及其相关的设备应用越来越广泛,对供电质量的要求也越来越高,劣质的电能质量将会导致产品质量下降,严重的甚至损坏生产设备,造成难以估量的损失。电压超调量指实际电压、电压稳定值间最大偏差与电压稳定值的比值,电网电压的超调会对电网中设备元部件造成一定损坏,比如破坏绝缘介质、损坏内部电路的电容、电感及耐冲击能力差的固体元件、降低设备使用寿命等。
目前,电能质量相关标准给出了电压偏差、频率偏差、三相不平衡度、谐波间谐波、闪变等典型电能质量指标的计算方法以及相关限值,但对于含SVG时电网PCC电压超调量并没有给出计算方法。
发明内容
发明目的:针对上述现有技术,提出一种含SVG时电网PCC电压超调量的计算方法,在已知SVG控制系统参数的情况下,预测出投入SVG时刻电网PCC电压超调量。
技术方案:一种含SVG时电网PCC电压超调量的计算方法,SVG控制器采用基于同步旋转坐标系的dq解耦控制,按典型I型配电网系统设计SVG控制系统电流调节器;投入SVG时刻PCC电压超调量σU%的表达式为:
其中,SVG电流环PI控制系统中,TS为电网电流采样周期,Kip为PI调节器比例系数,KPWM为SVG控制系统中三相桥路PWM等效增益,L为SVG输出电感;电网中投入SVG前,电流I中有功电流分量Ip与无功电流分量Iq有效值之比为ε1:1,电流I中无功电流分量Iq与SVG应补偿电流iq有效值之比为ε2:1,电网PCC电压与母线电压有效值之比为ε3:1,输电线路上阻抗比为R:X=ε4:1。
有益效果:本发明的一种含SVG时电网PCC电压超调量的计算方法,监测投入SVG前电网中电流I、补偿支路中SVG应补偿电流iq、电网PCC电压、母线电压以及输电线路上阻抗Z,在已知SVG控制系统参数电流采样周期、PI调节器比例系数、桥路PWM等效增益以及输出电感的条件下,通过计算,预测出投入SVG时刻电网PCC电压超调量。应用本发明的计算方法,根据电网运行参数及SVG控制系统参数,预测投入SVG时刻电网PCC超调量的大小,为SVG控制系统的设计以及在电网中的安装位置提供参考,有效改善电能质量。
附图说明
图1是典型配电网系统结构示意图;
图2是SVG控制系统中q轴电流环PI简化控制框图;
图3是其余参数一定时,电压超调量与控制系统参数Kip、TS、L的关系图;
图4是其余参数一定时,电压超调量与电网参数ε1、ε2、ε3的关系图。
具体实施方式
下面结合附图对本发明做更进一步的解释。
一种含SVG时电网PCC电压超调量的计算方法,典型I型配电网系统如图1所示,a点即为电网PCC,电网中投入SVG前,输电电流I中有功电流分量Ip与无功电流分量Iq有效值之比为ε1:1,电流I中无功电流分量Iq与SVG应补偿电流iq有效值之比为ε2:1,电网PCC电压与母线电压有效值之比为ε3:1,输电线路上阻抗Z=R+jX,阻抗比为R:X=ε4:1。SVG控制器采用基于同步旋转坐标系的dq解耦控制,按典型I型系统设计SVG控制系统电流调节器,q轴电流环PI简化控制框图如图2所示(p轴亦相同),TS为电网电流采样周期,即PWM开关周期,Kip为PI调节器比例系数,KPWM为SVG控制系统中三相桥路PWM等效增益,L为SVG输出电感,τi为PI调节器积分系数。
在投入SVG前,测得电网运行参数ε1、ε2、ε3、ε4,假设已知SVG控制系统参数TS、Kip、KPWM、L,投入SVG时刻,由控制系统控制理论可知,SVG所补偿无功电流的超调量σiq%的表达式为:
在SVG补偿电流峰值时刻,对电网电流、网损以及PCC电压进行计算分析;在SVG补偿电流达到稳定值时刻,对电网电流、网损以及PCC电压进行计算分析;可得PCC电压超调量σU%的表达式为:
应用该表达式计算出投入SVG时刻电网PCC电压超调量σU%,若超调量过高,可通过调节SVG控制系统参数来降低超调量。
若ε1=2,ε2=1.5,ε3=0.9,ε4=0.32,KPWM=100,得到PCC电压超调量σU%与变量Kip、TS、L的关系如图3所示,球形大小表示σU%大小。
若TS=1/7500,Kip=0.16176,KPWM=100,L=2.5mH,ε4=0.32,得到PCC电压超调量σU%与电网参数ε1、ε2、ε3的关系如图4所示,球形大小表示σU%大小。
通过调节相关参数来改变σU%大小,进而提高电能质量,保证电网正常高效运行。
以上所述仅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和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (1)
1.一种含SVG时电网PCC电压超调量的计算方法,其特征在于:SVG控制器采用基于同步旋转坐标系的dq解耦控制,按典型I型配电网系统设计SVG控制系统电流调节器;投入SVG时刻PCC电压超调量σU%的表达式为:
其中,SVG电流环PI控制系统中,TS为电网电流采样周期,Kip为PI调节器比例系数,KPWM为SVG控制系统中三相桥路PWM等效增益,L为SVG输出电感;电网中投入SVG前,电流I中有功电流分量Ip与无功电流分量Iq有效值之比为ε1∶1,电流I中无功电流分量Iq与SVG应补偿电流iq有效值之比为ε2∶1,电网PCC电压与母线电压有效值之比为ε3∶1,输电线路上阻抗比为R∶X=ε4∶1。
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