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Document Type |
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Thesis |
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Document Title |
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WIDE-AREA DAMPING CONTROL OF LOW-FREQUENCY OSCILLATIONS IN INTERCONNECTED POWER SYSTEMS تصميم مثبت شبكة الطاقة المُستند على نظام القياس واسع المدى |
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Subject |
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Faculty of Engineering |
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Document Language |
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Arabic |
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Abstract |
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Today’s highly interconnected power networks are expected to have greater system stability than the networks of the past, yet their very interconnectedness can in certain circumstances give rise to destabilizing low-frequency oscillations (LFOs) that the power networks are not, in themselves, equipped to dampen. Thus, in order for a large electrical power system to operate securely and reliably over time, it must make use of damping controllers, which stabilize the system’s electro-mechanical LFOs and thereby enhance the system’s dynamic response. Since the 1960s, an important technique used for damping LFOs has been the use of Power System Stabilizer (PSS). However, the Conventional Power System Stabilizer (CPSS) utilizes only local measurements as inputs. As these inputs are not global, CPSSs are not effective at suppressing low-frequency inter-area oscillations (LFIO) occurring between non-adjacent facilities within a network. The recent developments in Phasor Measurement Units (PMUs) and Wide-Area Measurement Systems (WAMSs) has improved the situation, in part by encouraging researchers to design Wide-Area Damping Controllers (WADC) that employ remote measurements.
In the damping of LFOs in interconnected systems, appropriate parameter-tuning of PSSs with WAMS input signals can extend and effectively improve the controller capabilities. As the LFOs are caused by a lack of damping of the electro-mechanical mode of the interconnected system, the desired additional damping can be provided by supplementary excitation control. It is expected that real-time monitoring and control using WAMS measurements could help enhance system stability and security, particularly by enhancing LFO damping control. Alternatively, WADC could be used with Flexible AC Transmission Systems (FACTS) controllers, which are installed at critical locations in power networks and thus can provide significantly better performance as compared to CPSS.
This thesis proposes the implementation of a Weighted Wide Area Damping Controller (WWADC), in which weighted factors are introduced for each remote feedback signal. The WWADC for both conventional PSS and FACTS-based stabilizers are proposed. System modal analysis are performed for determining the optimal combination of the input signals to the proposed WWADCs and also for finding the optimal location of the proposed controllers in electrical power networks. Based on the linearized model, differential evolution (DE) algorithm is applied to search for optimal controller parameters and optimal weighted factors. |
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Supervisor |
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Prof. Yusuf Al-Turki |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1439 AH
2018 AD |
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Co-Supervisor |
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Prof. Sreerama Kumar |
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Added Date |
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Monday, January 22, 2018 |
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Researchers
| صالح محمد بامســــق | Bamasak, Saleh Mohammad | Researcher | Doctorate | |
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