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This paper proposes an improved midpoint potential balancing method that reduces deviation of DC capacitor voltages of T-type three-level inverter. In the proposed balancing strategy, the 60° coordinate is used to avoid sophisticated calculation of trigonometric function, and a simplified balance factor is set in each region of virtual space vector diagram. All values of the simplified balance factor...
Voltage dependent current order limiter (VDCOL) can limit the HVDC current in low voltage and reduce the reactive power requirement, which helps power system quickly restore stability. Thus, the reasonable setting of VDCOL control parameters is vital to improve the recovery characteristics of system. This paper makes a deep research about VDCOL parameters setting method with considering reactive power...
With the scale of small and medium hydropower increasing gradually, it is difficult to establish a detailed model because the parameters of each generating unit can barely be obtained. To build a dynamic equivalent model of the hydropower generator group, this paper presents an estimation-based equivalent method, which will keep the dynamic responses and the transient stability consistent before and...
Short-term load forecast plays a vital role in the electric power industry. In this paper, a deep belief network is proposed for short-term load forecasting. However, the Back-Propagation (BP) algorithm of deep belief network for fine tuning has some inherent drawbacks and limitations, such as slow convergence rate and easy to fall into local minimum. To overcome the drawbacks, several neural network...
This paper proposes an electrode line fault supervision strategy based on the high-frequency voltage standing-wave ratio (VSWR). The paper analyzes the VSWR from theoretical side of its characteristics of the lossless transmission line to the numerical characteristics of the VSWR under different electrode line operation modes. On the basis of VSWR of the high-frequency signal, the electrode line fault...
With nuclear power generation increasing, power system peak load situation is becoming more and more serious. It is very important to study the joint generation dispatching issue of power grid for nuclear power peaking. Due to the anti peaking characteristics of wind power output, power load peak valley difference further increases, and thus it exacerbates the difficulty of peak load regulation in...
With the growth of new energy resources and the increasingly complexity of power gird and operation condition, a method for intelligent recognition of transient instability pattern based on power grid topology is proposed in this paper. On the basis of the recognition of Dominant Instability Generator Group, a transient stability assessment algorithm which merely uses steady-state information is presented...
More and more renewable power with large capacity has been incorporated into power system. The high fluctuation and randomness features of wind power present a number of challenges for the safety grid. ‘Grid friendly’ wind farm with storage device can reduce the volatility impact of grid safety. The optimal output strategy based on least-square polynomial fitting was established for the wind farm...
The most difficult challenge of converting the PSCAD model for use in the Electromagnetic Simulation Program (ESP), developed by China Southern Power Grid (CSG), is that the PSCAD model is graphically-based and the topology information of all elements is realized via the closeness of the coordinates of the element. This paper describes the details of PSCAD models, how to map the PSCAD model into the...
In this paper, an approach is made to design a Thermal and Power efficient RAM for that reason we have used DDR4L memory and six different members of SSTL I/Os standards on 28nm technology. Every spacecraft requires most energy efficient electronic system and for that very purpose we have designed the most energy efficient RAM. In this design, we have taken two main parameters for analysis that is...
In order to comprehensively evaluate and improve the performance of the Rogowski coil electronic current transformer (RCECT), this paper presents a method for steady state characteristic and the dynamic characteristic test. The testing scenario is configured in an electromagnetic transient simulation software (PSCAD), then the digital signals are reproduced as analog signals by amplifiers. The sensor...
To meet the requirements of ultra-high speed protection on UHV transmission lines, this paper proposes a fault phase selection based on wavelet analysis theory, which can detect the mutations' time and size of singular signal in fault signal. Firstly, this algorithm transforms the transient fault current into model fault current to eliminate the impact of the various phases' coupling. Then modulus...
This paper points out the problems of digital relay protection tester and the new requirements of relay protection testing in smart substation, combining the key technology of automation relay protection tester and takinG full advantage of the IEC 61850 standard, such as the unified protocol, the configurable model file, the specification of State Grid's “Six Reunification” as well. In this paper,...
Neighborhood Area Networks (NANs) are an important part of the smart grid, which is the last one mile communication in a Smart Grid Communication Network (SGCN), and a routing algorithm is one of the key technologies to improve the performance of NANs. Designing routing metrics is critical for routing algorithm of NANs. The goal of the metric is to choose a high-throughput path between a source and...
The real-time monitoring of status parameters, such as cell voltage and state of charge (SOC), is an important guarantee of the safety operation of the battery energy storage system (BESS). And the two-level architecture of hardware system which includes several battery management units (BMU) and the central management unit (CMU) is designed with the communication protocol and data conversion algorithm...
In order to evaluate operational state of distribution network and facilitate the economic dispatch considering distributed generators, operational evaluation system of distribution network considering distributed generators is proposed. Furthermore, complex evaluation indicators of safety, power quality and economy are defined to evaluate distribution network with distributed generators as well....
Traditional electromechanical Energy Meters for electricity are now replaced by digital meters in domestic as well as commercial applications. The trend of automation can be incorporated in presently working digital energy meter to make it smarter. Idea is to design and implement a smart prepaid energy meter prototype having wireless communication facility. The proposed system presents a total electronic...
This paper propose a mathematical formulation of energy management problem and its implementation in an energy management system (EMS) for isolated neighboring multi-microgrids. Using the model predictive control technique, the optimal operation of the microgrids is determined by utilizing an extended horizon of prediction and evaluation, which allows a proper scheduling of the energy storage units,...
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