水力发电变流调速系统关键设计和实验分析(英文)

The Key Design and Experimental Analysis of Variable-speed System for Water Generation System

直驱型水力发电系统使水轮机与发电机之间直接相连,为提高系统效率和可靠性,减少系统在进行有源逆变时,交流侧电感的大小影响系统静、动态性能,从稳态和瞬态电流跟踪出发,提出了满足水力发电系统要求的交流侧电感设计的新方法.针对传统的直流侧电容的参数设计方法的不足,即没有考虑PWM开关周期的延时而导致的整流器和逆变器同时向直流母线馈电的问题,提出了直流侧电容容量最小化的设计方法,对所设计的变流调速系统的特性进行了仿真和实验验证.结果表明,设计的变流调速系统不仅具有能量双向流动的特性,而且具有网侧功率因数可控,电流谐波含量低,直流母线电压泵升高快且可控的优点.

Direct-drive water generation system is connected directly to the water turbine and generator. In order to improve the efficiency and reliability of system, to reduce the inductance of AC side affects the static and dynamic performance of the whole system when the direct-drive water generation system is actively inverting. The paper presents a new design method of the inductance of AC side based on steady-state and transient current tracking, which can meet demands of the direct-drive water generation system, and verifies its feasibility by simulation. At the same time, the parameters designs method of the traditional DC capacitance have some limitations, which does not account for any problems, such as PWM switching cycle of delay caused by the rectifier and inverter DC bus synchronously to feed the problem. In order to resolve such questions, the new design method of the smallest DC capacitor capacity is proposed, and the characteristics of variable flow speed control system was emulated and experimented, the simulation and experimental verification is correct. The results showed that the hydroelectric power converter speed control system not only has the characteristics of two-way flow of energy, but also has power factor controllable network side, the current low harmonic content, the DC bus voltage pump up fast and controllable.