Studies on Characteristics of Power System Composed of Various Power Sources with Electronic Power Conversion

电子功率变换多种电源组成的电力系统特性研究

• 批准号: 12650278
• 负责人: OHSAWA Yasuharu
• 金额: $ 2.3万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650278/
• 关键词: inverter; dc power supply; load sharing; power system simulator; frequency control; 不可分担; 需給バランス; 系統連系; 太陽光発電; 燃料電池; 同期発電機; 直交電力変換; 過渡特性; 安定性

1. Inverter power sources can affect the dynamic performance of the interconnected power system, if the capacity of inverters is not negligibly small compared with that of the power system. A power supplying system composed of a synchronous generator and an inverter power source of comparable capacity was assumed, and examined was its dynamic performance such as frequency variation and voltage variation in case of dc output power change and load change via computer simulations and simulated experiments. From the results of simulations and experiments, it was found that the dynamic performance is mainly governed by the frequency control mechanism (governor) of the synchronous generator and the voltage and phase angle control scheme of the inverter.2. If an area is largely supplied electric power by inverter power sources, power supply can be continued in case of disconnection from the main power system. For the operation of islanded power network composed of inverters without a synchronous generator, a new frequency control and load sharing schemes for the inverters should be developed. In the present study, a control algorithm for that purpose was proposed, and its validity was examined via transient simulations. From their results it was found that the frequency and load sharing are adequately controlled under transients such as load change and area disconnection, if the control system is designed rightly.

1.如果逆变器的容量与电力系统的容量相比不是微不足道的，那么逆变器电源会影响互联电力系统的动态性能。假设由一台同步发电机和一台容量相当的逆变电源组成的供电系统，通过计算机仿真和模拟实验，研究了在直流输出功率变化和负载变化的情况下，系统的频率变化和电压变化等动态性能。从仿真和实验结果可以看出，同步发电机的频率控制机制（调速器）和逆变器的电压和相角控制策略是影响系统动态性能的主要因素.如果一个地区主要由逆变器电源供电，则在与主电力系统断开的情况下可以继续供电。对于无同步发电机的逆变器组成的孤岛电网运行，需要开发新的逆变器频率控制和负载分配方案。在本研究中，为此目的提出了一种控制算法，其有效性通过瞬态仿真进行了检查。从他们的结果中发现，如果控制系统设计正确，则在负载变化和区域断开等瞬变情况下，频率和负载分配得到充分控制。