基于直流电压和功率控制的单相光储微网并网策略研究
发布时间：2019-02-26 18:53
【摘要】：分布式电源发电已成为全球在能源危机环境下获得新能源的重要方式,其中对电力电子设备逆变器控制的研究是不可或缺的一部分。脉冲宽度调制(Pulse Width Modulation,PWM)逆变器以其直流侧电压可控,交流侧电流正弦度好,交流侧功率因素可控等优点越来越受到热捧。单相光伏并网控制在小功率的光伏应用中广泛应用,所以对单相逆变器的控制技术及稳定并网有着重要的现实意义。(1)依据本文采用的两级式单相光伏并网发电系统结构,构建光伏电池模型;将扰动电压法应用于实现光伏电池组最大功率跟踪;搭建单相逆变器在αβ坐标系和dq坐标系下的数学模型;对LC滤波电路设计选型。模型准确建立对系统器件选型和参数整定十分关键。(2)提出基于虚拟磁链定向和负载功率前馈的并网逆变器控制策略。传统电压矢量定向存在很多可以改进的地方。针对电流内环比例积分(ProportionalIntegral,PI)控制器不能实现无稳态误差跟踪问题,本文电流内环采用准比例谐振(quasi Proportional resonant,qPR)控制器,由逆变器模型设计出合理的内环控制器参数,仿真和实验证明能实现电流无稳态误差跟踪;从简化系统复杂度角度考虑,应用单相虚拟磁链定向方式,实现省略交流侧电压传感器使用的目的,该定向方法能有效并网;直流母线电压扰动易导致系统不稳定,针对系统在负载扰动情况下直流母线电压出现较大扰动问题,研究采用负载功率前馈方法,仿真验证该方法能有效抑制因负载扰动导致的直流母线电压波动。(3)提出单相逆变器功率控制策略。针对单相逆变器只有单一交流变量而需要构建虚拟正交量的问题,对其构建方法分析,采用二阶广义积分器的方式。在两相虚拟系统基础上,推导由瞬时功率理论和预测算法一般准则下的单相功率预测模型。通过仿真将该控制策略应用在单相逆变器上,结果表明其同样能实现单位功率因素并网,也能实现有功无功功率的独立控制。(4)将上述所提算法在基于dSPACE的半实物仿真平台上进行验证,实验结果能证明所提方法的有效性,对分布式光伏并网发电有一定的工程意义。
[Abstract]:Distributed power generation has become an important way to obtain new energy in the world under the environment of energy crisis, in which the research on inverter control of power electronic equipment is an indispensable part. Pulse width modulated (Pulse Width Modulation,PWM (PWM) inverter is more and more popular for its advantages of DC side voltage control, AC side current sine degree, AC side power factor control and so on. Single-phase photovoltaic grid-connected control is widely used in low-power photovoltaic applications, so it has important practical significance for single-phase inverter control technology and stable grid-connected. (1) according to the two-stage single-phase photovoltaic grid-connected power generation system structure adopted in this paper, Building photovoltaic cell model; The perturbation voltage method is applied to realize the maximum power tracking of photovoltaic cells, the mathematical model of single-phase inverter in 伪 尾 coordinate and dq coordinate system is built, and the LC filter circuit is designed and selected. Accurate modeling is critical to system device selection and parameter tuning. (2) A grid-connected inverter control strategy based on virtual flux orientation and load power feedforward is proposed. There are many improvements in traditional voltage vector orientation. In order to solve the problem that the current inner loop proportional integral (ProportionalIntegral,PI) controller can not achieve steady-state error tracking, the quasi-proportional resonant (quasi Proportional resonant,qPR (quasi-proportional resonance) controller is adopted in this paper, and the reasonable parameters of the inner loop controller are designed based on the inverter model. Simulation and experiment show that the current can be tracked without steady state error. Considering the complexity of the system, the single-phase virtual flux orientation method is used to achieve the purpose of omitting the use of AC-side voltage sensors. This orientation method can be effectively connected to the grid. DC bus voltage disturbance can easily lead to the instability of the system. In view of the large disturbance of DC bus voltage under load disturbance, load power feedforward method is used in this paper. Simulation results show that the proposed method can effectively suppress the DC bus voltage fluctuation caused by load disturbance. (3) A power control strategy for single-phase inverter is proposed. In order to solve the problem that only single AC variable is needed to construct a virtual orthogonal variable, a second-order generalized integrator is used to analyze the construction method of single-phase inverter. Based on the two-phase virtual system, a single-phase power prediction model based on the general criteria of instantaneous power theory and prediction algorithm is derived. Through simulation, the control strategy is applied to single-phase inverter, and the results show that the control strategy can also realize the unit power factor connected to the grid. It can also realize the independent control of active power and reactive power. (4) the proposed algorithm is verified on the hardware-in-the-loop simulation platform based on dSPACE, and the experimental results show that the proposed method is effective. It has certain engineering significance for distributed photovoltaic grid-connected power generation.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727
本文编号：2431049
[Abstract]:Distributed power generation has become an important way to obtain new energy in the world under the environment of energy crisis, in which the research on inverter control of power electronic equipment is an indispensable part. Pulse width modulated (Pulse Width Modulation,PWM (PWM) inverter is more and more popular for its advantages of DC side voltage control, AC side current sine degree, AC side power factor control and so on. Single-phase photovoltaic grid-connected control is widely used in low-power photovoltaic applications, so it has important practical significance for single-phase inverter control technology and stable grid-connected. (1) according to the two-stage single-phase photovoltaic grid-connected power generation system structure adopted in this paper, Building photovoltaic cell model; The perturbation voltage method is applied to realize the maximum power tracking of photovoltaic cells, the mathematical model of single-phase inverter in 伪 尾 coordinate and dq coordinate system is built, and the LC filter circuit is designed and selected. Accurate modeling is critical to system device selection and parameter tuning. (2) A grid-connected inverter control strategy based on virtual flux orientation and load power feedforward is proposed. There are many improvements in traditional voltage vector orientation. In order to solve the problem that the current inner loop proportional integral (ProportionalIntegral,PI) controller can not achieve steady-state error tracking, the quasi-proportional resonant (quasi Proportional resonant,qPR (quasi-proportional resonance) controller is adopted in this paper, and the reasonable parameters of the inner loop controller are designed based on the inverter model. Simulation and experiment show that the current can be tracked without steady state error. Considering the complexity of the system, the single-phase virtual flux orientation method is used to achieve the purpose of omitting the use of AC-side voltage sensors. This orientation method can be effectively connected to the grid. DC bus voltage disturbance can easily lead to the instability of the system. In view of the large disturbance of DC bus voltage under load disturbance, load power feedforward method is used in this paper. Simulation results show that the proposed method can effectively suppress the DC bus voltage fluctuation caused by load disturbance. (3) A power control strategy for single-phase inverter is proposed. In order to solve the problem that only single AC variable is needed to construct a virtual orthogonal variable, a second-order generalized integrator is used to analyze the construction method of single-phase inverter. Based on the two-phase virtual system, a single-phase power prediction model based on the general criteria of instantaneous power theory and prediction algorithm is derived. Through simulation, the control strategy is applied to single-phase inverter, and the results show that the control strategy can also realize the unit power factor connected to the grid. It can also realize the independent control of active power and reactive power. (4) the proposed algorithm is verified on the hardware-in-the-loop simulation platform based on dSPACE, and the experimental results show that the proposed method is effective. It has certain engineering significance for distributed photovoltaic grid-connected power generation.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727
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