大规模的风光制氢系统接入电网,电网呈现低惯量、弱阻尼现象,导致系统频率稳定性受到影响。针对此问题,该文提出风光制氢系统的自适应转动惯量、阻尼系数虚拟同步发电机（VSG）控制策略。首先,在风光制氢系统并网逆变器控制回路中引入惯性和阻尼特性,使系统具备类似同步发电机的惯性支撑特征。然后,计及风光制氢系统规模的扩张和调节范围与速度的提升需求,根据发生扰动时的惯量阻尼系数的动态响应特性,设计惯量阻尼自适应控制规则,以扩大系统的惯性调节范围,改善扰动偏移量,并加快恢复速度。仿真验证表明：所提控制方法使大容量风光制氢系统在稳定运行的基础上,有效减小功-频响应曲线振荡幅度,在增大系统的响应调整范围的同时,系统响应和恢复的快速性也得到保证。
Abstract
The large-scale wind-solar hydrogen production system is connected to the power grid, and the power grid has low inertia and weak damping, which affects the stability of the frequency of the system. To address this problem, a control strategy for a wind-solar hydrogen production system is proposed in this paper, which is based on a virtual synchronous generator with an adaptive moment of inertia and an adaptive damping coefficient. First, the inertia and damping characteristics are introduced into the grid-connected inverter control loop of the wind-solar hydrogen production system, so that the system has the inertial support characteristics similar to the synchronous generator. Then, considering the expansion of the scale of the wind-solar hydrogen production system and the improvement of the adjustment range and speed, according to the dynamic response characteristics of the inertia damping coefficient when the disturbance occurs, the inertia damping adaptive control rule is designed to expand the inertia adjustment range of the system, improve the disturbance compensation, and accelerate the recovery speed. The simulation results show that the proposed control method can effectively reduce the oscillation amplitude of the power-frequency response curve while ensuring stable operation of the large-capacity wind-solar hydrogen production system. While increasing the response regulation range of the system, the speed of system response and recovery is also guaranteed.
关键词
风电 /
光伏 /
制氢 /
虚拟同步机 /
自适应控制系统 /
虚拟惯性和阻尼 /
功频响应
Key words
wind power /
photovoltaics /
hydrogen production /
virtual synchronous generator /
adaptive control system /
virtual inertia and damping /
power-frequency response
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