摘要
针对高比例光伏并网引起的用户侧电压越限问题,可采用由旋转移相变压器(RPST)构成的旋转潮流控制器(RPFC)进行电压调控。首先,分析了RPST与RPFC的工作原理;然后,对比研究了两者的调压方式,指出RPFC具有更好的应用前景,并进一步提出了RPFC的电压调控方法,即根据用户侧电压实际值与额定值的偏差得到RPFC输出电压幅值的设定值,再通过调节旋转角的大小控制输出电压幅值,并利用旋转角之间的偏差对RPFC伺服电动机的占空比进行量化计算,从而对两个旋转角的转速进行闭环协调控制,保证用户侧的电压水平;最后,从稳态与暂态控制特性方面分别对RPST和RPFC的调压能力进行对比实验,验证了RPFC实现用户侧电压调控的可行性和有效性。
In view of the problem of user-side voltage exceeding the limit and voltage fluctuation caused by a high proportion of photovoltaic grid connection,a rotary power flow controller(RPFC)consisting of a rotary phase shifting transformer(RPST)can be used for voltage regulation and control.This paper compared the voltage regulation of RPST and RPFC.The voltage regulation strategy of RPST mainly consists of two parts:power factor limitation and output voltage phase control.RPST connects a series output voltage with fixed amplitude and adjustable phase in the line by changing the phaseθRPST.During the voltage regulation of RPST,there is a certain phase offsetδbetween the voltages U_(1)and U_(2),this offset will cause a phase shift between the Iand U_(1),resulting in a change in the line power factor.To ensure that the line power factor meets the minimum specified requirements,the regulation range of RPST should be limited.The RPFC control strategy consists of three parts:output voltage amplitude calculation,rotation angle control and speed coordination control.RPFC regulates the output voltage amplitudeΔURPFC by adjusting the rotation anglesα1 andα2,keeping the phase constant.To ensure that the stator voltages U_(st1)and U_(st2)are symmetrical about the U_(1),the speed of the servo motor is adjusted to keep the rotation angle always satisfyingα1+α2=0 to achieve the coordinated regulation of speed.This paper developed an RPFC experimental prototype and built a voltage regulation scenario at 220V voltage level to compare and analyze the voltage regulation capability of RPST and RPFC in terms of steady and transient control characteristics,respectively.In terms of steady-state control characteristics,the rotation angle of the voltage regulator is adjusted and the load power remains unchanged.In the process of RPST regulation,the voltage phase shift between U_(1)and U_(2)tend to increase and then decrease.In the process of RPFC regulation,the voltage phase shift is not generated.In terms of transient control char
作者
颜湘武
彭维锋
邵晨
贾焦心
李铁成
Yan Xiangwu;Peng Weifeng;Shao Chen;Jia Jiaoxin;Li Tiecheng(Hebei Provincial Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding 071003,China;State Grid Hebei Electric Power Research Institute Shijiazhuang 050021,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第S01期70-79,113,共11页
Transactions of China Electrotechnical Society
基金
国网河北省科技项目“雄安城市配电网电压和潮流数字化精准调控技术研究与应用(SGHEDK00DYJS2000286)”
国家自然科学基金项目(52207102)资助。
关键词
旋转移相变压器
旋转潮流控制器
电压调控
对比实验
Rotary phase shifting transformer
rotary power flow controller
voltage regulation
comparison experiments
