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[IEEE 2019 IEEE International Conference on Unmanned Systems (ICUS) - Beijing, China (2019.10.17-2019.10.19)] 2019 IEEE International Conference on Unmanned Systems (ICUS) - Observability Enhancement of the Target Tracking Model Based on Infrared Semi-strapdown Seeker
摘要： A large petrochemical company installed nearly 50 000 hp of electrical submersible pumps (ESPs) at an existing midwest U.S. oil ?eld. Being equipped with adjustable-speed drives (ASDs), these ESPs introduced high levels of current harmonic dis-tortion, which resulted in 14%–19% voltage harmonic distortion at the electrical utility supply. Initially, the utility noticed the low power factor (PF) and had the oil company pay for the installation of power factor correction (PFC) capacitors on their medium-voltage supply. Once installed, the utility began to have problems with these capacitors and continued to receive complaints from other customers adjacent to the oil ?eld; thus, they enforced har-monic limits, as de?ned by IEEE Std 519, at all points of common coupling. Measurements were made with a harmonic analyzer at several locations throughout the electrical system to quantify harmonics and determine the effect the ESPs were having on the utility distribution system. Computer simulations were performed to analyze different methods of harmonic mitigation. Ultimately, passive harmonic ?lters were installed on all ESPs in phases. In addition, the PFC capacitors were permanently disconnected after determining that a power system resonance condition existed. Once all phases of the project were complete, the voltage distortion level decreased to below 5%, and PF improved to near unity without the PFC capacitors. This paper will describe the effect of harmonics on the electrical distribution system caused by ASDs, practical solutions to excessive voltage harmonic distortion, reso-nance issues with PFC capacitors, and the challenges associated with different methods of harmonic mitigation.
关键词： resonance,Adjustable-speed drives (ASDs),electrical submersible pumps (ESPs),harmonic quantities,harmonics,capacitors,harmonic ?lters,harmonic mitigation,power factor correction (PFC),harmonic distortion
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Active Frequency Support Control of Energy Storage Power Station Based on Photovoltaic and Energy-storage Microgrid
摘要： When the photovoltaic and energy-storage microgrid(PV-ESM) operate under a conventional droop or virtual synchronous generator(VSG) control, the system frequency will be unstable if the load is disturbed violently. To solve the problem, the feedback loop control strategy of the ESPS with a first order differential control links of high-pass filter is proposed from the aspect of optimizing energy storage power station(ESPS) dynamic power response, and the adaptive selection basis of damping coefficient and inertia time constant is given. An improved VSG frequency adjustment strategy based on feedforward power is proposed in order to support power frequency actively by EPSP power adjustment. Taking a typical off-grid PV-ESM scenario in an industrial park as an example, the simulation results show that the proposed strategy could support frequency recovery rapidly when frequency instability induced by load mutation and ensure the quality of power supply.
关键词： VSG,PV-ESM,Frequency support,Power feed-forward,ESPS
更新于2025-09-16 10:30:52