An improved automatic voltage coordination control strategy （AVCCS） based on ;automatic voltage control （AVC） and battery energy storage control （BESC） is proposed for photovoltaic grid-connected system （PVGS）...An improved automatic voltage coordination control strategy （AVCCS） based on ;automatic voltage control （AVC） and battery energy storage control （BESC） is proposed for photovoltaic grid-connected system （PVGS） to mitigate the voltage fluctuations caused by environmental disturbances. Only AVC is used when small environ- mental disturbances happen, while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen. An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process. A benchmark low voltage distribution system including ]？VGS is established by using the commercial software Dig SILENT. Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547, and the installed battery capacity is also reduced. Meanwhile, the battery＇s service life is ex- tended by avoiding frequent charges/discharges in the control process.展开更多
海上风力发电-高压直流输电HVDC(high voltage direct current)系统是风力发电及其功率传输技术的发展方向。文中分析了电压型精简矩阵变换器RMC(reduced matrix converter)的双极性电压空间矢量调制BV-SVM(bipolar voltage space vecto...海上风力发电-高压直流输电HVDC(high voltage direct current)系统是风力发电及其功率传输技术的发展方向。文中分析了电压型精简矩阵变换器RMC(reduced matrix converter)的双极性电压空间矢量调制BV-SVM(bipolar voltage space vector pulse-width modulation)策略,提出了基于RMC的直驱海上风电-高压直流输电系统控制策略以及基于有功功率指令修正的RMC换流器功率协调控制策略。在正常情况下实现了最大风能跟踪MPPT(maximum power point tracking)控制、直流稳压以及并网有功/无功功率解耦控制;在电网电压跌落时实现了HVDC系统海上-岸上换流器协调控制,保持HVDC系统有功功率传输平衡,提高了风电机组的低电压穿越LVRT(low-voltage ride-through)能力。仿真结果验证了所提控制策略的正确性和可行性。展开更多
基金Supported by National Basic Research Program of China ("973" Program,No. 2009CB219701 and No. 2010CB234608)Tianjin Municipal Science and Technology Development Program (No. 09JCZDJC25000)Specialized Research Fund for Doctor Discipline of Ministry of Education of China (No. 20090032110064)
文摘An improved automatic voltage coordination control strategy （AVCCS） based on ;automatic voltage control （AVC） and battery energy storage control （BESC） is proposed for photovoltaic grid-connected system （PVGS） to mitigate the voltage fluctuations caused by environmental disturbances. Only AVC is used when small environ- mental disturbances happen, while BESC is incorporated with AVC to restrain the voltage fluctuations when large disturbances happen. An adjustable parameter determining the allowed amplitudes of voltage fluctuations is introduced to realize the above switching process. A benchmark low voltage distribution system including ]？VGS is established by using the commercial software Dig SILENT. Simulation results show that the voltage under AVCCS satisfies the IEEE Standard 1547, and the installed battery capacity is also reduced. Meanwhile, the battery＇s service life is ex- tended by avoiding frequent charges/discharges in the control process.
基金The Project Supported by Hunan Provincial Natural Science Foundation of China(12jj2039)Project Supported by Foundation of Key Laboratory of Smart Grids Operation and Control(2012kfjj05)~~
文摘分析了精简矩阵变换器(reduced matrix converter,RMC)双极性空间矢量调制策略,提出了基于RMC高频链换流器的串联多端海上风电-HVDC系统拓扑结构及其协调控制策略。该控制策略由风电场监测控制(wind farm supervisory control,WFSC)、海上风电机组控制和网侧并网控制组成,并采用最优直流电流参考算法实现。在系统正常运行时,该控制策略可实现各风电机组独立最大风能跟踪(maximum power point tracking,MPPT)控制、直流电流控制、并网有功和无功功率解耦控制;在风电机组故障和电网电压波动等情况下保证系统安全高效运行。仿真结果验证了所提拓扑及其控制策略的正确性和可行性。
文摘海上风力发电-高压直流输电HVDC(high voltage direct current)系统是风力发电及其功率传输技术的发展方向。文中分析了电压型精简矩阵变换器RMC(reduced matrix converter)的双极性电压空间矢量调制BV-SVM(bipolar voltage space vector pulse-width modulation)策略,提出了基于RMC的直驱海上风电-高压直流输电系统控制策略以及基于有功功率指令修正的RMC换流器功率协调控制策略。在正常情况下实现了最大风能跟踪MPPT(maximum power point tracking)控制、直流稳压以及并网有功/无功功率解耦控制;在电网电压跌落时实现了HVDC系统海上-岸上换流器协调控制,保持HVDC系统有功功率传输平衡,提高了风电机组的低电压穿越LVRT(low-voltage ride-through)能力。仿真结果验证了所提控制策略的正确性和可行性。
