Mesh network, with its many advantages, is one of the most promising topologies in future distributed wireless network. The system performance can be unproved by optimally allocating overall power and bandwidth to transmitter relays. This paper focuses on subcarrier allocation orthogonal frequency division multiple access (OFDMA) based regenerative mesh Three sub-optimal strategies are presented this maximize end-to-end capacity multi-hop link. first one, "reference strategy (RS)", a...

The existing methods for multi-point harmonic contribution evaluation usually require some preconditions, such as the node current is equivalent to emission and number of measurements not less than sources. However, these requirements may be satisfied in practice. In this context, paper proposes an improved sparse component analysis (SCA) method solve underdetermined blind source separation model, which used describe state under incomplete measurements. SCA adopts a new two-stage technique....

Wind power has been promoted to mitigate the energy crisis worldwide. It beneficial impacts on economic and environment. However, owing chaotic nature of atmospheric movement, wind generation always exhibits nonlinear non-stationary uncertainties, which brings great challenges for system operation planning. To meet challenges, a novel deep learning based combined approach is proposed uncertainties. In this approach, start-or-art point forecast wavelet transform RNN-RBM learning. Raw...

In order to make the DC voltage of high direct current system based on modular multilevel converter (MMC-HVDC) rise rated value smoothly and quickly, novel closed-loop precharge control strategy is put forward with respect side AC voltage. Adopting feedback regulate a constant charging current, two strategies can effectively reduce time eliminate surge. Then, relationship between drop ratio, short circuit ratio current-limiting resistance deduced application scope proposed respectively. At...

In order to improve the energy efficiency and achieve purpose of saving ad pollutant emission reductions, a model solar combined cooling heating power (CCHP) system integrated with storage is presented. The indices prime consumption, environment economy are established formed as comprehensive evaluation index using judgment matrix method. A two-stage optimal planning design method applied optimize capacity operation strategy CCHP system. simulation results demonstrate that performances in...

IGBT modules are widely used in various fields of power electronics, and their reliability is important for systems. Multi-chips parallel face more challenges condition monitoring health assessment due to complex spatial structure, uneven current distribution, temperature resulting aging. Focusing on this problem, based the multi-physics field finite element simulation technology, degradation law electrothermal magnetic characteristic parameters during aging failure process multi-chips...

Abstract The penetration of unmonitored behind‐the‐meter photovoltaic systems has increased rapidly over the past decade. While unsupervised methods have been proposed to estimate generation, their performance is significantly affected by hyperparameters. Existing for choosing hyperparameters require labelled data, which are unavailable system operators. In this paper, a data‐driven method generate data optimize estimation generation. First, permutation‐test based developed detect...

Existing photovoltaic power prediction methods often only predict the definite value of future output, and model is single has limited accuracy. In view this, this paper proposes an interval method for output based on a combined model. The proposed consists whale optimization algorithm (WOA), long-short term memory (LSTM) neural network, least square support vector machine (LSSVM). WOA used to optimize some relevant parameters in LSTM LSSVM. adopted high-frequency signals original sequence....

Abstract China is developing rapidly in renewable energy development, electricity market reform, and carbon construction, using mechanisms for efficient planning investment. The markets are interrelated entities. This context has led to a dual-level optimization model investment planning, considering cost recovery new power system goals. includes deriving coupling quotations conventional units based on dynamic emission characteristics proposing an spot mechanism influenced by quota trading....

The mechanical DC circuit breaker based on the principle of artificial zero crossing generally selects vacuum interrupter (VI) as breaking element. As frequency oscillating current is at kHz level, actual to be interrupted a medium with certain component. In this paper, dielectric recovery after divided into several stages and analyzed. Through theoretical analysis simulation, capacity intermediate influence direct component limit are studied. Sheath development theory metal vapor diffusion...

Unobserved behind-the-meter (BTM) photovoltaic (PV) systems have increased rapidly in distribution over the past decade. Various PV configurations system make it challenging to capture characteristics of aggregated BTM generation. To improve performance estimating generation using smart meter data, paper proposes a method that groups consumers before estimation. This identifies nonuniform through correlation analysis between net load and calculated plane-of-array (POA) irradiance. It divides...

During the breaking process of a vacuum interrupter, there is time interval between current zero and generation recovery voltage. This variable matters to calculation continuous transition model, but always simplified as constant. In this article, we put forward concept preparatory stage sheath, analyze production mechanism influence on ability, give computation method for duration stage. order verify rationality theoretical analysis proposed in experimental measurement conducted. The...

Substation is the heart of an interconnected power system. With development smart grid, concept substation proposed. The objectives are to build efficient networked information management platform, increasing flexibility in organization and distribution information, greatly enhancing capabilities exchanging processing substation. However, onsite commissioning much more complex than that traditional ones, because digital difficult measure a flow needs be testified. In this paper, novel test...

Power industry has largest coal consumption and carbon emissions in China. Real-time, accurate comprehensive measurement of electricity is the basis premise to explore potential emission reduction guide interaction power users reduce emissions. It also provides data support market. Based on theory system flow analysis, this paper proposes a full-link metering method for system, which realizes "minute-level" real-time "user-level" information at generation, grid load sides. The impacts...

Wind power has been promoted to mitigate the energy crisis worldwide. However, owing chaotic nature of atmospheric movement, wind generation always exhibits nonlinear and non-stationary uncertainties. Designing an storage system for dispatch a farm is effective integration solution. This paper presents framework integrating stochastic unit commitment, storage, formulations that account uncertainty. Generation cost fluctuation load are proposed as multi-objective functions with constraint...

In many power systems, especially in oil system, induction machine takes most part of the loads, which asks for continuous during operation. Now two-phase faults are usually made breakers three phase trip. A single-phase breaking method fault small current grounding system is proposed considering capacitor compensating. The voltage and under different locations analyzed, point also considered with accessing, based on an equivalent model. Finally, simulation model built PSCAD/EMTDC order to...

Abstract There are many “west-to-east” electricity transmission lines in China, some of which transmit bundling power among including wind and photovoltaic (PV) power. On one hand, according to the interconnected systems theory, transmitted on trans-regional tie-lines needs keep relatively stable. Therefore, turbines PV facilities have be bundled with other controllable units, e.g., thermal units. ratio can improved by making full use flexible regulation strategy. With which, adjusted along...