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首页> 外文期刊>IEEE Transactions on Control Systems Technology >Enhanced Current-Limiting Droop Controller for Grid-Connected Inverters to Guarantee Stability and Maximize Power Injection Under Grid Faults
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Enhanced Current-Limiting Droop Controller for Grid-Connected Inverters to Guarantee Stability and Maximize Power Injection Under Grid Faults

机译：增强电流限制下垂控制器，用于网格连接的逆变器，以保证稳定性并最大限度地提高电网故障下的电力注入

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摘要

Droop-controlled inverters are widely used to integrate distributed energy resources (DERs) to the smart grid and provide ancillary services (frequency and voltage support). However, during grid variations or faults, the droop control scheme should inherit a current-limiting property to protect both the inverter and the DER unit. In this brief, a novel structure of the recently developed current-limiting droop (CLD) controller is proposed to accomplish two main tasks: 1) guarantee current limitation with maximum power injection during grid faults and 2) rigorously guarantee asymptotic stability of any equilibrium point in a given bounded operating range of the closed-loop system for a grid-connected inverter. Since the maximum power of the DER unit can be utilized under grid faults with the proposed enhanced CLD and then inspired by the latest fault-ride-through requirements, it is further extended to provide voltage support to a faulty grid via the maximum injection of reactive power. This is achieved by simply adjusting the reactive power reference opposed to the existing control schemes that require adjustment of both the real and the reactive powers. Hence, a unified current-limiting control scheme for grid-connected inverters under both normal and faulty grids with a simplified voltage support mechanism is developed and experimentally verified in this brief.
机译：下垂控制的逆变器广泛用于将分布式能量资源（DER）集成到智能电网并提供辅助服务（频率和电压支架）。但是，在网格变化或故障期间，下垂控制方案应继承电流限制属性以保护逆变器和DER单元。在此简介中，提出了最近开发的电流限制下垂（CLD）控制器的新颖结构，以实现两个主要任务：1）保证电流限制在网格故障期间最大功率注射，2）严格保证任何均衡点的渐近稳定性在给定环路系统的给定界限工作范围内，用于网格连接的逆变器。由于DER单元的最大功率可以在网格故障下使用所提升的增强CLD，然后通过最新的故障驾驶需求启发，因此进一步扩展到通过最大限度地注入反应性来为故障网格提供电压支撑力量。这是通过简单地调整与现有控制方案相对的无功功率参考来实现的，这是需要调整真实和无功功率的现有控制方案。因此，在这种情况下开发并在本简要介绍了具有简化电压支持机构的正常和故障网格下的网格连接逆变器的统一电流限制控制方案。

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