CVaR-based stochastic wind-thermal generation coordination for Turkish electricity market

Uncertainties in wind power forecast, day-ahead and imbalance prices for the next day possess a great deal of risk for the profit of generation companies participating in a day-ahead electricity market. Generation companies are exposed to imbalance penalties in the balancing market for unordered mismatches between associated day-ahead power schedule and real-time generation. Coordination of wind and thermal power plants alleviates the risks raised from wind uncertainties. This paper proposes a novel optimal coordination strategy by balancing wind power forecast deviations with thermal units in the Turkish day-ahead electricity market. The main focus of this study is to provide an optimal trade-off between the expected profit and the risk under wind uncertainty through conditional value at risk (CVaR) methodology. Coordination problem is formulated as a two-stage mixed-integer stochastic programming problem, where scenario-based wind power approach is used to handle the stochasticity of the wind power. Dynamic programming approach is utilized to attain the commitment status of thermal units. Profitability of the coordination with different day-ahead bidding strategies and trade-off between expected profit and CVaR are examined with comparative scenario studies

Monomelic Amyotrophy (Hirayama Disease): Clinical Findings, EMG Characteristics and Differential Diagnosis

WOS: 000365428100010Introduction and Objective: Monomelic amyotrophy (MA) is a benign motor neuron disease with a stationary stage after a progressive course, involving one or more myotomes in the upper limb. In the early stages, it may be difficult to discriminate the diseases presenting with similar clinical course. We reviewed clinical and EMG characteristics and differential diagnosis of MA for this purpose. Methods: Fourteen cases admitted to the Neurophysiology EMG laboratory of Medical School of Ege University, and diagnosed as having monomelic amytrophy between 2005 and 2014, were evaluated retrospectively along with complaints, age at onset, gender, the involved myotome, EMG and clinical characteristics. Cases with possible etiological diagnoses that might cause mononeuropathy or detected motor conduction block or developed ALS during follow-ups were excluded from the study. Results: All fourteen patients had onset in the upper limb. The female to male ratio was 4: 10, the mean age of the onset was 24 +/- 8.64 years (mean +/- Standard deviation), minimum-maximum age of onset was 16-40 years, with median value being 21. C8-T1 segments were involved in all cases except one. Follow-up EMG studies demonstrated denervation, fasciculations, and reduced compound muscle action potential amplitudes. Electrophysiologically, our three asymptomatic cases had moderate involvement in the contralateral limb without any complaints. Conclusion: Cases with MA can be distinguished from ALS by symptom onset at younger ages in men, its benign course and generally with stabilization of clinical and EMG findings in 2 to 4 years. Asymptomatic side should also be considered to be affected electrophysiologically