Abstract
Droop schemes are usually applied to the control of distributed generators (DGs) in microgrids (MGs) to realize proportional power sharing. The objective might, however, not suit MGs well for economic reasons. Addressing that issue, this paper proposes an alternative droop scheme for reducing the total active generation costs (TAGC). Optimal economic operation, DGs’ capacity limitations and system stability are fully considered basing on DGs’ generation costs. The proposed scheme utilizes the frequency as a carrier to realize the decentralized economic operation of MGs without communication links. Moreover, a fitting method is applied to balance DGs’ synchronous operation and economy. The effectiveness and performance of the proposed scheme are verified through simulations and experiments.
Highlights
Interest has been concentrated on microgrids (MGs) [1,2,3,4], which represent an effective approach to deal with distributed generation [5,6,7,8]
Less costly distributed generators (DGs) should be controlled to provide more power and all DGs in the MGs should be coordinated in economic operation modes [12,13,14]
The centralized control scheme possesses the advantages of economic operation, better voltage and frequency regulation in MGs [18,19]
Summary
Interest has been concentrated on microgrids (MGs) [1,2,3,4], which represent an effective approach to deal with distributed generation [5,6,7,8]. The economical control approaches in MGs can be classified into the centralized, distributed and decentralized schemes. The centralized control in a hierarchical coordination control manner is proposed in [15], which can realize the optimal economic operation at steady state and ensure the resilient response of MGs to emergencies. The centralized control scheme possesses the advantages of economic operation, better voltage and frequency regulation in MGs [18,19]. It requires global information, complicated centralized controller and extensive communication networks, which increases the capital cost and system complexity, and reduces the reliability of MGs
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