论文标题
最佳电压和HVDC系统的当前控制，以改善实时频率调节
Optimal Voltage and Current Control of an HVDC System to Improve Real-Time Frequency Regulation
论文作者
论文摘要
最近已经开发了用于支撑网格频率调节（GFR）的高压直流（HVDC）系统。本文提出了针对基于线路的转换器（LCC）HVDC系统的新的控制策略，其中最佳调节DC-Link电压和电流以改善整流器和逆变器端AC网络中的实时GFR。 LCC HVDC系统的动态模型是使用直流电压和电流作为输入变量开发的，并与惯性仿真和下垂控制的反馈回路集成在一起。线性二次高斯（LQG）控制器还设计用于最佳的次要频率控制，同时减轻HVDC转换器的下垂控制器之间的冲突。然后进行特征值分析，重点关注模型参数和控制器收益对拟议策略的影响。模拟案例研究还使用Jeju-Haenam HVDC系统作为测试床进行。案例研究的结果证实，提出的策略使HVDC系统通过利用HVDC转换器的快速动力学来改善与发电机在两个方面网格中的协调。在LQG加权系数，惯性模拟和下垂控制的各种条件下，提出的策略也有效。
High-voltage direct-current (HVDC) systems for constant or intermittent power delivery have recently been developed further to support grid frequency regulation (GFR). This paper proposes a new control strategy for a line-commutated converter-based (LCC) HVDC system, wherein the DC-link voltage and current are optimally regulated to improve real-time GFR in both rectifier- and inverter-side AC networks. A dynamic model of an LCC HVDC system is developed using the DC voltage and current as input variables, and is integrated with feedback loops for inertia emulation and droop control. A linear quadratic Gaussian (LQG) controller is also designed for optimal secondary frequency control, while mitigating conflict between the droop controllers of the HVDC converters. An eigenvalue analysis is then conducted, focusing on the effects of model parameters and controller gains on the proposed strategy. Simulation case studies are also performed using the Jeju-Haenam HVDC system as a test bed. The results of the case study confirm that the proposed strategy enables the HVDC system to improve GFR, in coordination with generators in both-side grids, by exploiting the fast dynamics of HVDC converters. The proposed strategy is also effective under various conditions for the LQG weighting coefficients, inertia emulation, and droop control.
