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Quantified analysis method for operational flexibility of active distribution networks with high penetration of distributed generators

机译：分布式发电机高渗透率的有源配电网运行灵活性的量化分析方法

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With the integration of high shares of distributed generators (DGs), it is increasingly difficult to cope with the various uncertainties and puts forward higher requirements for the operational flexibility in active distribution networks (ADNs). Controllability of ADNs has been significantly improved by the application of energy storage and power electronic devices. However, due to the difficulties in effective coordination of various controllable resources, the controllability cannot be fully translated into the system flexibility. In this paper, an analytical framework for quantifying the flexibility of ADNs is proposed, including the quantification of node flexibility, the matching of system flexibility, and the flexibility of network transmission. The proposed framework provides a novel perspective of flexibility to reinterpret operation issues of distribution networks. As the power imbalance and voltage deviation are even more severe caused by the high shares of DG integration, the indexes of flexibility from magnitude, frequency and intensity dimensions are deteriorated in ADNs operation. Through the spatial and temporal regulation of power flow, various controllable devices, such as soft open points (SOPs) and energy storage system (ESS), can effectively mitigate the power imbalance and voltage deviation to improve the indexes of system flexibility. Thus, under the unified analytical framework, the potential benefits of system controllability are fully utilized to provide effective countermeasures for the flexible operation of ADNs. Finally, case studies are performed on the modified IEEE 33-node system to quantify the operational flexibility of ADNs and verify the flexibility enhancement brought by controllable resources.
机译：随着高份额的分布式发电机（DG）的集成，越来越难以应对各种不确定性，并且对有源配电网（ADN）的操作灵活性提出了更高的要求。通过使用储能和电力电子设备，ADN的可控性已得到显着改善。但是，由于难以有效地协调各种可控资源，因此可控性无法完全转化为系统的灵活性。本文提出了一种量化ADN灵活性的分析框架，包括节点灵活性的量化，系统灵活性的匹配以及网络传输的灵活性。所提出的框架为重新解释配电网络的运营问题提供了灵活性的新颖视角。由于DG积分的高比例导致功率不平衡和电压偏差更加严重，因此ADNs操作中的幅度，频率和强度尺寸的灵活性指标会变差。通过潮流的时空调节，各种可控设备，如软开路点（SOP）和储能系统（ESS），可以有效缓解功率不平衡和电压偏差，提高系统灵活性指标。因此，在统一的分析框架下，系统可控性的潜在优势得到了充分利用，为ADN的灵活运营提供了有效的对策。最后，在改进的IEEE 33节点系统上进行案例研究，以量化ADN的操作灵活性并验证可控资源带来的灵活性增强。

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