适用于黑启动的光储联合发电系统协调控制策略研究
发布时间：2018-11-01 19:25
【摘要】：为研究光储联合发电系统的黑启动能力,本文采用光储系统启动厂用异步电动机的方法模拟电网黑启动过程。首先对光伏电池、储能电池的数学模型及原理进行了详细分析,建立了适用于黑启动的光储联合发电系统,并对其单元结构的模型及原理进行分析。在此基础上,研究了黑启动时光储联合发电系统的有功功率、无功功率控制,考虑到因储能剩余充电容量不足可能造成黑启动失败的情况,基于常规MPPT(Maximum Power Point Tracking)控制算法原理,提出了一种负荷跟踪与MPPT协调控制策略。该控制策略能够有效控制光伏出力,使出力充足时有效跟踪负荷变化,无多余功率向储能充电;出力不足时实现最大功率跟踪,联合储能共同为负荷供电,减小了所需的储能容量,为成功黑启动提供保障。然后明确了黑启动条件下光伏子系统与储能子系统的控制目标,建立了光伏控制子系统和储能控制子系统。光伏子系统前级DC/DC变换器采用最大功率跟踪/负荷跟踪控制,后级DC/AC逆变器采用电压电流双环控制,控制直流侧母线电压稳定,负责向系统负荷供电,不参与系统调频;储能子系统前级双向DC/DC变换器采用直流母线电压控制,实现储能充放电控制,后级DC/AC逆变器采用恒压恒频控制平抑光伏系统出力波动,为系统提供电压与频率支撑。最后在Matlab/Simulink环境中搭建光储联合发电系统仿真模型,通过仿真验证了本文所提负荷跟踪与MPPT协调控制策略的可行性和有效性,同时验证了光储联合发电系统能够为大电网的恢复提供黑启动电源,具备快速黑启动能力。
[Abstract]:In order to study the black-start ability of optical storage combined generation system, this paper uses the method of induction motor to simulate the black-start process of power grid. Firstly, the mathematical model and principle of photovoltaic cell and energy storage cell are analyzed in detail, and the light storage combined generation system suitable for black start is established, and the model and principle of its unit structure are analyzed. On this basis, the active power and reactive power control of black-start time storage combined generation system is studied. Based on the principle of conventional MPPT (Maximum Power Point Tracking) control algorithm, a coordinated control strategy for load tracking and MPPT is proposed. The control strategy can effectively control the photovoltaic output force, make the sufficient output force to effectively track the load change, no excess power charged to the energy storage; When the output is insufficient, the maximum power tracking is realized, and the combined energy storage supplies the load together, which reduces the required energy storage capacity and provides the guarantee for the successful black start. Then, the control objectives of photovoltaic subsystem and energy storage subsystem under black start are defined, and the photovoltaic control subsystem and energy storage control subsystem are established. The front-stage DC/DC converter of photovoltaic subsystem adopts maximum power tracking / load tracking control, while the back stage DC/AC inverter adopts voltage and current double loop control, which controls the DC bus voltage stability and is responsible for supplying power to the system load. Not participating in system FM; The DC bus voltage control is used to realize the charge and discharge control in the front stage DC/DC converter of the energy storage subsystem. The latter stage DC/AC inverter uses constant voltage and constant frequency control to stabilize the force fluctuation of the photovoltaic system, which provides the voltage and frequency support for the system. Finally, the simulation model of optical storage combined generation system is built in Matlab/Simulink environment, and the feasibility and effectiveness of the proposed coordinated control strategy of load tracking and MPPT are verified by simulation. At the same time, it is verified that the optical storage combined generation system can provide black start power for the restoration of large power grid, and has the ability of fast black start.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61
本文编号：2304876
[Abstract]:In order to study the black-start ability of optical storage combined generation system, this paper uses the method of induction motor to simulate the black-start process of power grid. Firstly, the mathematical model and principle of photovoltaic cell and energy storage cell are analyzed in detail, and the light storage combined generation system suitable for black start is established, and the model and principle of its unit structure are analyzed. On this basis, the active power and reactive power control of black-start time storage combined generation system is studied. Based on the principle of conventional MPPT (Maximum Power Point Tracking) control algorithm, a coordinated control strategy for load tracking and MPPT is proposed. The control strategy can effectively control the photovoltaic output force, make the sufficient output force to effectively track the load change, no excess power charged to the energy storage; When the output is insufficient, the maximum power tracking is realized, and the combined energy storage supplies the load together, which reduces the required energy storage capacity and provides the guarantee for the successful black start. Then, the control objectives of photovoltaic subsystem and energy storage subsystem under black start are defined, and the photovoltaic control subsystem and energy storage control subsystem are established. The front-stage DC/DC converter of photovoltaic subsystem adopts maximum power tracking / load tracking control, while the back stage DC/AC inverter adopts voltage and current double loop control, which controls the DC bus voltage stability and is responsible for supplying power to the system load. Not participating in system FM; The DC bus voltage control is used to realize the charge and discharge control in the front stage DC/DC converter of the energy storage subsystem. The latter stage DC/AC inverter uses constant voltage and constant frequency control to stabilize the force fluctuation of the photovoltaic system, which provides the voltage and frequency support for the system. Finally, the simulation model of optical storage combined generation system is built in Matlab/Simulink environment, and the feasibility and effectiveness of the proposed coordinated control strategy of load tracking and MPPT are verified by simulation. At the same time, it is verified that the optical storage combined generation system can provide black start power for the restoration of large power grid, and has the ability of fast black start.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61
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