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In regard to electric devices, currently designed large-scale distributed generation systems require a precise prediction strategy based on the composition of internal component owing to an environmental fluctuating condition and forecasted power variation. A number of renewable resources, such as solar or marine based energies, are made up of a low voltage direct current (DC) network. In addition to actively considering a power compensation plan, these generation systems have negative effects, which can be induced to a connected power system. When a storage is connected to a DC-based generation system on an inner network along with other generators, a precise state analysis plan should back the utilization process. This paper presents a cooperative operating condition, consisting of the shared DC section, which includes photovoltaic (PVs) and energy storage devices. An active storage management plan with voltage-expectation is introduced and compared via a commercialized electro-magnetic transient simulation tool with designed environmental conditions. Owing to their complexity, the case studies were sequentially advanced by dividing state analysis verification and storage device operation.

• A dynamic model of receiving-end MMC including the effect of the sending-end MMC is developed. The model can accurately describe the dynamic behavior of the receiving-end MMC in an MMC-HVDC system. • To reveal the effect of different controllers on the three types of stability, the contributions of the state variables on the internal modes, ac external modes, and dc external modes are analyzed by participation factor analysis. • A coordinated control parameter design is developed to guarantee the stability of MMC. Compared to the existing parameter design methods, the proposed method can simultaneously guarantee the internal stability in MMC, the ac-side interactive stability, and the dc-side interactive stability. The interaction between the modular multilevel converter (MMC) and the power electronic systems leads to the interactive stability issues to the high-voltage dc transmission system (HVDC), including the dc-side interactive stability and ac-side interactive stability. Besides, the interactions among distributed submodules in MMC can cause the internal stability issue. All three types of stability issues pose challenges to the safe operation of the MMC-HVDC system. To guarantee the stable operation of MMC-HVDC system, this paper analyzes the internal and interactive stability of receiving-end MMC comprehensively and proposes a systematic procedure for coordinated design of control parameters. Firstly, a dynamic phasor model of receiving-end MMC considering the complete dynamics of the dc system is established to accurately capture the dynamic behavior of the receiving-end MMC. Subsequently, this model is used to evaluate the contributions and influence degree of different control parameters to the interactive and internal stability. Based on the analyses, a coordinated design method of multiple control parameters is developed to simultaneously improve the dc-side interactive stability, ac-side interactive stability, and internal stability. Finally, in the case study, the parameters range of multiple controllers is given following the coordinated design procedure. The effectiveness of the stability analyses and the feasibility of the designed parameter range is validated by the time-domain simulation in MATLAB/ Simulink. [ABSTRACT FROM AUTHOR]

In regard to electric devices, currently designed large-scale distributed generation systems require a precise prediction strategy based on the composition of internal component owing to an environmental fluctuating condition and forecasted power variation. A number of renewable resources, such as solar or marine based energies, are made up of a low voltage direct current (DC) network. In addition to actively considering a power compensation plan, these generation systems have negative effects, which can be induced to a connected power system. When a storage is connected to a DC-based generation system on an inner network along with other generators, a precise state analysis plan should back the utilization process. This paper presents a cooperative operating condition, consisting of the shared DC section, which includes photovoltaic (PVs) and energy storage devices. An active storage management plan with voltage-expectation is introduced and compared via a commercialized electro-magnetic transient simulation tool with designed environmental conditions. Owing to their complexity, the case studies were sequentially advanced by dividing state analysis verification and storage device operation. [ABSTRACT FROM AUTHOR]