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CIRCUIT-BENDING A VINTAGE CASIO AN ′80S SYNTHESIZER IS REBORN AS AN AVANT-GARDE INSTRUMENT

IEEE SPECTRUM 2016年第5期53卷 24-26页

作者： Cass, Stephen Smil, Vaclav Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China STMicroelectronics Crolles France

I've been increasingly intrigued by electronic music, sparked in large part by covering an exhibition of designer theremins for IEEE Spectrum in 2013, followed by watching documentaries such as 2014's I Dream of Wires, which traces the history of the modular synthesizer. One notable cohort in the modern electronic music scene are the circuit benders. These folks modify all sorts of audio-enabled equipment, including children's toys and digital keyboards, to produce sounds definitely not intended by the designers. So when I came across the Casio SK-5 keyboard I'd received for my 14th Christmas lurking in my parents' attic, I pounced. Released in 1987, and aimed at younger players, the Casio SK-5 was never intended to be used by serious musicians. The keyboard had only 32 "minikeys" sized for smaller fingers, and it could play just four notes simultaneously. The SK-5 could mimic a number of instruments, but its killer feature was that you could create your own instrument sounds through sampling audio (at a whopping 8-bit resolution).

关键词： Timing circuits

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Time series online prediction algorithm based on least squares support vector machine

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Journal of Central South University of Technology 2007年第3期14卷 442-446页

作者：吴琼刘文颖杨以涵 Key Laboratory of Power System Protection and Dynamic Security Monitory and Control of Ministry of Education North China Electric Power University

Deficiencies of applying the traditional least squares support vector machine （LS-SVM） to time series online prediction were specified. According to the kernel function matrix＇s property and using the recursive calculation of block matrix, a new time series online prediction algorithm based on improved LS-SVM was proposed. The historical training results were fully utilized and the computing speed of LS-SVM was enhanced. Then, the improved algorithm was applied to timc series online prediction. Based on the operational data provided by the Northwest power Grid of China, the method was used in the transient stability prediction of electric power system. The results show that, compared with the calculation time of the traditional LS-SVM（75 1 600 ms）, that of the proposed method in different time windows is 40-60 ms, proposed method is above 0.8. So the improved method is online prediction. and the prediction accuracy（normalized root mean squared error） of the better than the traditional LS-SVM and more suitable for time series online prediction.

关键词： time series prediction machine learning support vector machine statistical learning theory

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Integral planning for distribution system

Integral planning for distribution system

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Jikeng, Lin Xudong, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

A new integral planning method for distribution system without candidate schemes is proposed in the paper. Transportation model is applied to the load assignation. A two-step optimization strategy is developed to obtain the optimal solution in each sub-region for each scheme of substation-capacity combinations. The proposed method is implemented and tested successfully with one practical urban distributed system. Comparisons are made between the traditional grading planning approach and the new integral planning method, which demonstrates the potential advantage of the method in practice. ©2010 IEEE.

关键词： Grading

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Management method of the balance account based on incentive compatible theory

Management method of the balance account based on incentive ...

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1st International Conference on Sustainable power Generation and Supply, SUPERGEN '09

作者： Jikeng, Lin Xudong, Wang Tie, Bao Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424449347

In the unilateral open electricity market in China, the balance account is created as "regulator" between the bidding price of generation and retail price of electricity. Currently, the management of the balance account has serious defects. This might lead to the huge deficit and endanger the operation of market. Based on the incentive compatible principle, we propose a new method to manage the balance account through reward-penalty in the paper. The optimal bidding strategy for the power suppliers considering the new management method is also provided. The test results indicate that the proposed bidding strategy can mitigate the market power of the generation, reduce the market clearing price significantly, keep the fund of the balance account fluctuating within a certain range and further ensure the stability and sustainability of power market operation.

关键词： power markets

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Asynchronous parallel simulation of transient stability based on equivalence

Asynchronous parallel simulation of transient stability base...

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1st International Conference on Sustainable power Generation and Supply, SUPERGEN '09

作者： Jikeng, Lin Xudong, Wang Xinyu, Tong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424449347

An asynchronous parallel method based on equivalence is proposed for transient stability simulation of power system. In the method, the system is partitioned into several interconnected subsystems by geographical location, and the subsystems are equivalent each other at each integration step. Each subsystem utilizes equivalent information from other subsystems to calculate independently. At each integration step, a subsystem only needs the predictive equivalence and correctional equivalence once. Additionally, asynchronous parallel technology based on the MPI on the PC-Cluster platform is designed to speed up the convergence. Several cases demonstrate that the proposed method has fast calculation speed and efficiency, as well as the simulation precision accepted for engineering application. For some large scale real system, the real-time or even super-real-time simulation will be realized.

关键词： Transients

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Harmonic analysis method based on multiple modulation zoom analysis and interpolating windowed FFT method

Harmonic analysis method based on multiple modulation zoom a...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Wang, Jidong Yang, Guanqing Wen, Jing Zhu, Dong Che, Yanbo Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781457702051

Since many power electronics equipments and nonlinear loads were accessed, more and more harmonics and inter-harmonics occurred in power system. But when the analyzed signal contains components with frequency close to each other, precise analysis can not be made by traditional harmonics analysis methods such as interpolating windowed FFT method. In this paper, first a new method-multiple modulation zoom analysis based on complex analytic bandpass filter is adopted to make an accurate analysis to this kind of components. Then the remaining components are also analyzed by traditional method. simulations compared to direct interpolating windowed FFT method show that the proposed method can make a much better analysis with higher frequency resolution and so effectiveness of this method is demonstrated. © 2011 IEEE.

关键词： Harmonic analysis

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A study on capacity of distributed generation and its effect on short circuit current at micro-grid operation mode

A study on capacity of distributed generation and its effect...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Qiang, Jin Shuo, Zhang Yong-Li, Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781457703638

Now more and more distributed generations will be connected to distributed power system. It's found that different distributed generation has its own operation characteristic such as fluctuation and uncertainty. When micro-grid is to be island the voltage and frequency will change, so different control modes have been used on different distributed generation. Different kinds of distributed generation have different behavior when system operates normally or fault occurs. Classification and equivalence were adopted to deal with all kinds of the distributed generations in system. The distributed generations with same control mode can be combined to an equivalent generation. When system operates on grid-connection mode the short circuit current relies on the capacity of grid so it is rather large for the capacity of distribution grid is much more than that of distributed generations. But when micro-grid operates on island mode the short circuit current may decrease to a relative small value. Over current protection is widely used in distribution system, and the performance of it is dependent on operation mode, so the value estimate of short circuit current is necessary for verification of credibility and selectivity. Two summations of capacity were proposed to estimate the minimum and maximum short-circuit current in island. © 2011 IEEE.

关键词： Distributed power generation

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RETRACTED ARTICLE: The optimal bidding based on the prospect theory

RETRACTED ARTICLE: The optimal bidding based on the prospect...

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Lin, Ji-Keng Wang, Xudong Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

The bidding of generation companies is a risk decision-making process. The prospect theory describes the relationship of the human being risk preference with the expected profit: when the profit is bigger than the expected, most people might prefer to the risk avoidance; when the profit is smaller than the expected, people might incline to the risk preference to attempt to realize the target. A new bidding method based on prospect theory is proposed in the paper. Since the influences of the bidding failure risk and the target of expected profit on the decision cognitive psychology of the generation companies are both taken into account, the bidding strategy gained by the method is more consistent with the generation companies' psychological desire. The results of the examples demonstrate the feasibility of the method proposed. ©2010 IEEE.

关键词： Decision theory

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A study on steady characters of inverter interfaced distributed generation in three phase symmetrical system

A study on steady characters of inverter interfaced distribu...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Jin, Qiang Li, Yong-Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424459407

Recently inverters are all-pervading used as the connective instrument of distributed generations and distributed power system. When inverter interfaced distributed generations are connected to the distribution system, it may bring some new problems on load flow and fault characteristic and protection. The analysis on steady characters of PQ control mode and VF control mode inverter interfaced distributed generation is done when the system is three phase symmetrical. Generally speaking there are limits on power and current in control system for the security of distributed generations and power electronic devices in inverter, so the analysis is more complex. The mathematical analysis on three phase symmetrical system is done and restriction equations are described whether three phase symmetrical fault occurs or not. For the solution of the equation groups expresses the steady state of the system, so the solution of the equation groups is one and only. Then the restriction equation groups are solved. The solution in different areas shows the reason of steady non-linear character of inverter interfaced distributed generations and the simulation shows the conclusion correct. The steady characteristic curves of PQ control mode and VF control mode inverter interfaced distributed generation about voltage and current and power are got from the function of voltage and current and power at the same time. PQ control mode and VF control mode inverter interfaced distributed generation behave similarly but not identically when three phase symmetrical fault occurs in three phase symmetrical system. The disadvantageous influence on protection is analysed by the way. ©2010 IEEE.

关键词： Distributed power generation

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Detection for voltage fluctuation and flicker calculation based on the instantaneous reactive power theory

Detection for voltage fluctuation and flicker calculation ba...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Wang, Jidong Liu, Kun Gao, Yanjing Yang, Guanqing Che, Yanbo Key Laboratory of Power System Simulation and Control Tianjin University Ministry of Education Tianjin China

ISBN: (纸本)9781457702051

The voltage flicker which might bring out lighting equipments glitter and images distortion, make people's visual fatigue and adversely affect people's daily lives is caused by the great increase of shocking and nonlinear loads in the power system. In this paper, the causes, detection and measurement of the voltage fluctuation and flicker are analyzed, instantaneous reactive power theory detection method is used for simulation of voltage fluctuations and calculation of short-time flicker value and compared with square detection. The flicker values obtained by instantaneous reactive power theory detection are close to the real value, and the result of simulation shows the effectiveness of this method. © 2011 IEEE.

关键词： Reactive power

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