136 research outputs found
Control stabilisation of multiple distributed generation
No full textGrid connected distributed generation (DG) increases reliability and additional benefits for consumers as well as utilities. Recently, different types of DG are connected into distribution networks. Different control phenomena are applied based on types of DG. The stable and reliable operation of such power system requires sophisticated control. This paper presents a small-signal analysis for investigating dynamic behaviours of the system with multiple DG and also investigating control interactions between different types of DG. Dynamic model of a synchronous generator (SG) based hydro generator and inverter based photovoltaic/ wind distributed resources are considered for case studies to investigate grid connected and islanding mode of operation
Response coordination of distributed generation and tap changers for voltage support
No full textThe recent introduction of the competitive electricity market in many countries has sparked a renew trend in connecting small-size generators into distribution networks. Those new generators together with different other types of equipment such as On-load Tap Changing (OLTC) transformer, shunt capacitors, shunt reactors, etc, will all participate into the voltage regulation process in the power systems. Poor coordination between these devices may cause unnecessary operations, and consequently unnecessary wear, unnecessary energy consumption as well as poor voltage quality. In this paper, we present an innovative strategy to coordinate the voltage control actions in a distribution system with more than one voltage regulating device. The method for voltage control coordination is developed based on the priority level of each regulating device and implemented through communication. A sensitivity-based technique for determining the control zones of the regulating devices has been developed. A practical system with tap changers and distributed generator has been chosen to test the developed control method. Simulations have been carried out extensively on a practical distribution system to show the effectiveness of the method
A novel tuning method for advanced line drop compensator and its application to response coordination of distributed generation with voltage regulating devices
No full textNowadays, integration of small-scale electricity generators, known as Distributed Generation (DG), into distribution networks has become increasingly popular. This tendency together with the falling price of DG units has a great potential in giving the DG a better chance to participate in voltage regulation process, in parallel with other regulating devices already available in the distribution systems. The voltage control issue turns out to be a very challenging problem for distribution engineers, since existing control coordination schemes need to be reconsidered to take into account the DG operation. In this paper, a control coordination approach is proposed, which is able to utilize the ability of the DG as a voltage regulator, and at the same time minimize the interaction of DG with another DG or other active devices, such as On-load Tap Changing Transformer (OLTC). The proposed technique has been developed based on the concepts of protection principles (magnitude grading and time grading) for response coordination of DG and other regulating devices and uses Advanced Line Drop Compensators (ALDCs) for implementation. A distribution feeder with tap changing transformer and DG units has been extracted from a practical system to test the proposed control technique. The results show that the proposed method provides an effective solution for coordination of DG with another DG or voltage regulating devices and the integration of protection principles has considerably reduced the control interaction to achieve the desired voltage correction
Sistem Pendukung Keputusan Mitigasi Kondisi Air Bendungan Ir. Sutami Menggunakan Metode K-Nearest Neighbor Di Kecamatan Sumber Pucung Kabupaten Malang
No full textBendungan Ir Sutami di resmikan pada tahun 1977 di Desa Karangkates. Kecamatan Sumber Pucung, Kabupaten Malang Kapasitas volume air 343.000.000 m, luas daerah tampungan 2050 km dan berkedalaman 31 meter. Bendungan Ir Sutami berfungsi sebagai pembangkit listrik 3 x 35.000 keh (400 Juta kwh/taman), pengendali air baku, perikanan air tawar dan tempat wisata
Bendungan Ir Sulami memiliki potensi luapan air, sehingga dipandang perlu ada mitigasi kondisi air pada bendungan, melalui tindakan kajian resiko bahaya (hazard), kerentanan (vulnerability) dan kapasitas (capacity). Perlu ada piranti untuk menganalisis mitigasi kondisi air berdasarkan indikator masukan debit air ke dalam hendungan Piranti bantu kajian resiko menggunakan piranti hunak sistem pendukung keputusan
Untuk membangun sistem pendukung keputusan menggunakan metode KNN (K-Nearest Neighbor) berbasis web membutuhkan data sampel. Sebagai data sampel pemilis menggunakan data bendungan periode tahun 2012 hingga tahun 2014 Sedangkan untuk menguji keberhasilan membutuhkan data pembanding periode Bulan Jamaari hingga Juli 2015 Hasil penelitian adalah: (1) Pengujian validitas keputusan menghasilkan
Fing(-1,298781222) <tabel (2,771), maka hasil sistem pendukung
keputusan mitigasi kondisi air Bendungan Sutami dapat diterima. (2) Pengujian
user dari setiap komponen pertanyaan pada pengurus sistem seperti tabel 4.9
menghasilkan nilai 6 keterangan sangat baik nilai keterangan 4 haik dan nilai 2
keterangan cukup memiliki nilai rerata sebesar 78 dengan keterangan Baik Untuk
pengujian pada seluruh komponen pertanyaan menghasilkan nilai rerata 88.75
keterangan sangat baik (3) Proses kerja sistem terhadap browser Internet
Explorer Windows 8 nilai kerberhasilan 10%, Mozilla Firefox 42.0 (x86 id) nilai
keberhasilan 70% dan Google Chrome 47.2526.73 milai keberhasilan 100%
untuk browser berbasis mobile dapat menampilkan halaman publik yang berisi
informasi mitigasi dengan baik dengan nilai rata-rata terhadap keseluruhan sistem
sebesar 10% (4) Publik atau masyarakat dapat mengakses informasi mitigasi
Bendungan Sutami pada halaman mitigasi-bendungan-sutami
An Approach for Assessing the Effectiveness of Multiple Features Based SVM Method for Islanding Detection of Distributed Generation
No full textIslanding detection is a critical protection issue, as conventional protection schemes such as vector surge (VS) and rate of change of frequency (ROCOF) relays do not guarantee islanding detection for all network conditions. Integration of multiple distributed generation (DG) units of different sizes and technologies into distribution grids makes this issue even more critical. This paper presents a comprehensive analysis of the effectiveness of a new method for islanding detection in distributed generation (DG) networks. The proposed method, which is based on multiple features and support vector machine (SVM) classification, has the potential to overcome the limitations of conventional protection schemes. The multi-feature based SVM technique utilizes a set of features generated from numerous set of off-line dynamic events simulated under different network contingencies, operating conditions and power imbalance levels. Parameters (such as voltage, frequency and rotor angle) showing distinguishable variation during the formation of islanding, are selected as features for classification of the events. Features associated with different islanding and non-islanding events are used to train the SVM. The trained SVM is tested on a typical distribution network containing multiple DG units. Simulation results indicate that the proposed method can work effectively with high degree of accuracy under different network contingencies and critical levels of power imbalance that may exist during islanding
A synchronization control technique for soft connection of doubly-fed induction generator based wind turbines to the power grid
No full textelectromagnetic interference generated from fast switching power electronics devices” International journal of innovation in Energy system and power
No full textAbstract-This paper investigates the negative effects of electromagnetic interference (EMI) due to fast switching power devices (high dv/dt and di/dt) used in power electronic converters and industrial equipment. Mitigation techniques have been explored to reduce EMI noise effectively. Remedial measures to reduce the risk of equipment malfunction and health risk due to EMI have been explored. In this paper, EMI generation and propagation mechanism, high rates of change of voltage and current in fast switching power devices (such as IGBT), modelling and identifying EMI noise sources and coupling paths have been discussed. A practical EMI measurement system has been suggested to extract more information from EMI noise through analysis in frequency-domain and time-domain, and to test equipment emitting EMI to comply with electromagnetic compatibility (EMC) standards. Different filter topologies have been investigated for minimizing EMI noise and effect of high dv/dt and di/dt due to high frequency switching
A coordinated approach to energy exchange between electric vehicle load aggregators and wind generation companies under uncertainty
No full textActive power management of a super capacitor-battery hybrid energy storage system for standalone operation of DFIG based wind turbines
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