考虑电网调频需求时的直流负载电压下垂控制方法

电解电镀、冶金化工、电动汽车等行业的直流型用电负载在电网中的占比越来越大,对电网频率稳定性的影响也因此更加明显了。以响应电网调频需求为目标,提出了在保证电网电能质量的前提下,通过电力电子接口电路实现对直流负载电压的下垂控制,使可调型直流负载能够对电网频率异常事件进行响应。此外,为了确保直流负载的正常用电,并且避免对直流负荷进行频繁切换控制,还进一步提出了分区间调频控制模式,从而满足了需求侧响应、电网友好等电网需求。提出的控制方法结构简单,容易实现,可降低直流负载接入对电网的影响,提升电网对大规模直流负载接入的适应性。最后通过Simulink仿真验证了此方案的可行性、有效性。

DC load voltage based droop control method for grid frequency regulation

Accounting for electroplating, metallurgy, electric vehicles and other industries, the proportion of DC load in the grid is growing. The influence on the frequency stability of the power grid is more apparent. To respond to the demand of power system frequency regulation, this paper proposes that the droop control of DC load voltage can be realized through the power electronic interface circuit under the precondition of ensuring the power quality of the power grid so that the adjustable DC load can respond to the abnormal event of power grid frequency. In addition, in order to ensure the normal work of DC load and avoid switching the control of DC load frequently, this paper further proposes the control mode of divisional frequency regulation to meet the demand of power grid, such as demand side response and power grid friendly. The control method proposed in this paper has a simple structure and is easy to implement, which can reduce the impact of DC load connection on the power grid and improve the adaptability of the power grid to large-scale DC load access. At last, using simulink model verifies the feasibility and effectiveness of this scheme.