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基于电网电压前馈的光伏并网逆变器的仿真与实现 总被引:1,自引:0,他引:1
介绍了光伏并网逆变器的基本原理和拓扑结构;提出了一种基于电网电压前馈和电流跟踪控制技术的并网控制方法;建立了仿真模型;给出了系统控制的软件和硬件设计.在一台10kHz,3kW的实验样机上对该方案进行了实验,实验结果验证了该方法的有效性. 相似文献
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吴威 《电网与水力发电进展》2013,29(8):75-78
采用单相两级式光伏并网拓扑结构,针对传统双闭环控制策略,在光伏电池输人功率发生骤变时,响应滞后,系统稳定性较差的缺点,采用带有输入功率前馈的双闭环控制策略,并对其进行详细地分析。通过上述的分析,基于MATLAB平台,分别就两种策略搭建了光伏并网系统的仿真模型。仿真结果表明,当输入功率发生突变时,相对于传统双闭环控制策略,带有功率前馈的双闭环控制策略,其并网电流能够更快地达到新的稳定,同时降低了直流母线电压在该过程中的波动,具有更优越的动态性能。 相似文献
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为提高弱电网下光伏接入的并网电流质量和系统的稳定裕度,提出一种基于公共耦合电压点的选频前馈结合相位超前校正的组合控制新策略,该策略设计选频环改善电网电压前馈函数,使其既保留对电网背景谐波的抑制,又避免稳定裕度的下降,同时提出在电流通路中设计超前补偿校正环节,补偿弱电网阻抗引起的系统相角裕度下降,增加稳定裕量,从而提高光伏并入弱电网的并网电流质量和系统的稳定裕度。通过仿真和实验验证该策略对谐波抑制和稳定裕度提高的有效性。 相似文献
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光伏逆变器在弱电网下运行时,不均匀的线路阻抗使微电网控制系统功率因数下降、带宽变窄、控制性能减弱、跟踪误差变差,甚至导致逆变器系统退出运行等现象。为此,首先在双闭环控制方式下,通过电压环振荡处理引入瞬时无功控制手段与电压前馈控制方式来减少无功输出,提高逆变器控制系统并网电流质量。其次采用锁相环与锁频环复合同步手段优化跟踪质量,提高控制系统功率因数以及抗干扰能力。最后通过搭建两台2 kW同型号的单向并网逆变器并联运行的实验平台验证了该控制方法的正确性与实用性。 相似文献
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This paper presents the control of a three-level Neutral Point Clamped (NPC) voltage source inverter for grid connected photovoltaic (PV) systems. The control method used is the Extended Direct Power Control (EDPC), which is a generic approach for Direct Power Control (DPC) of multilevel inverters based on geometrical considerations. Maximum Power Point Tracking (MPPT) algorithms, that allow maximal power conversion into the grid, have been included. These methods are capable of extracting maximum power from each of the independent PV arrays connected to each DC link voltage level. The first one is a conventional MPPT which outputs DC link voltage references to EDPC. The second one is based on DPC concept. This new MPPT outputs power increment references to EDPC, thus avoiding the use of a DC link voltage regulator. The whole control system has been tested on a three-level NPC voltage source inverter connected to the grid and results confirm the validity of the method. 相似文献
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This paper presents implementation of particle swarm optimization (PSO) algorithm as a C-Mex S-function. The algorithm is used to optimize a 9-rule fuzzy logic controller (FLC) for maximum power point tracking (MPPT) in a grid-connected photovoltaic (PV) inverter. The FLC generates DC bus voltage reference for MPPT. A digital PI current control scheme in rotating dq-reference frame is used to regulate the DC bus voltage and reactive power. The proposed technique simplifies optimal controller design and ensures fast simulation speeds due to seamless integration with the simulation platform. Validity of the proposed method was verified using co-simulation in PSIM and MATLAB/Simulink. Simulation results show that the optimized FLC gives a better performance compared to fixed-step MPPT. 相似文献
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A multi-function grid connected PV system with three level NPC inverter and voltage oriented control
In this paper a grid connected photovoltaic (PV) system is presented. The grid integration of the PV system is carried out via a three phase three level neutral point clamped (NPC) inverter. To control the inverter a modified version of voltage oriented control (VOC) method and the space vector pulse width modulation (SVPWM) technique have been applied. With the proposed modification the PV system operates as a shunt active power filter (SAPF), a reactive power compensator, and a load’s current balancer simultaneously. In this way the PV system operates more efficiently compared to the conventional PV systems and offers ancillary services to electric power system. The effectiveness of the proposed control scheme is established through simulation results with Matlab/Simulink in steady state and transient response of the electric power distribution system. 相似文献
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介绍了智能化逆变式节能电熔焊机的研制过程,对控制部分及电源部分分别进行了阐述,特别是电源部分,从逆变电路的选定,中频变压器的选择,以及IGBT驱动及保护环节等作了比较详细的介绍,最后对实测波形进行了分析。 相似文献
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According to the theory of instantaneous reactive power, the active and reactive currents of inverter can be regulated by changing the amplitude and the phase of the output voltage of the inverter. Based on this theory, the active power output and the reactive power compensation (RPC) of the system are realized simultaneously at daylight. When the insolation is weak or the PV modules are inoperative at night, the RPC feature of PV system can still be used to improve the utilization factor of the system. The MATLAB simulation results validate the feasibility of the method. 相似文献