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This paper proposes a multiperiod optimal dispatch model for hybrid voltage source converter based multi-terminal DC (VSC-MTDC) system and AC grids with consideration of optimal coordination of offshore wind farm (OWF) and battery energy storage (BES). The OWF is connected to onshore AC grid by VSC-MTDC. The VSC capacity limits and Grid Code for OWF connection to AC grid are taken into consideration...
Due to the inverter used, DG can not only integrate the active power into power grid but also support the grid with reactive power. This paper proposes an optimal configuration methodology of renewable DG so as to maximize the penetration level of DG considering the temporal characteristics of active-reactive power (P-Q). Further, the uncertainty output of the wind generator, photovoltaic and small...
This paper proposes a mixed-integer quadratic programming (MIQP) model for optimal day-ahead distribution networks dispatch considering Wind Generators (WGs) and topology reconfiguration. Firstly, linearized current injection model is introduced for generators by a series of approximations. Then the day-ahead Switching Operations (SOs) of reconfiguration could be calculated in a linear form based...
In view of multifarious power quality problems in the electrical railway power system (ERPS), an asymmetrical connection balance transformer (ABT)-based power quality control system (ABT-PQCS) is presented in this paper. The back-to-back converter which is connected to the system through the step-down transformer can eliminate the negative sequence current (NSC), compensate reactive power at the same...
A new impedance model based optimal strategy (IMOS) for reactive power and negative sequence currents (NSC) compensation in electrical railway power system (ERPS) with V/v transformer is proposed in this paper. We demonstrate the EIM of ERPS first, and expound the optimal strategy theoretically afterwards. At last, the simulation validates the correctness and effectiveness of the compensation strategy.
In distribution network, with the installed of photovoltaic (PV), bought many problems. One of the most concerned problems is the overvoltage in the terminal bus of distribution network. It is caused by the reverse power flow which brought out by the increase of the PV sources penetration. In this paper, an improved PQ-Q (V) control strategy is proposed to alleviate such problem. The economic performance...
A modular multilevel converter based solid state transformer (MMC-SST) is proposed in this paper. By adopting the modular multilevel converter as the grid-connected converter at the high voltage (HV) side, the proposed MMC-SST can be applied to the high voltage level, and to comprehensively deal with the power quality problems in the High and medium voltage distribution networks. The topology and...
Aiming at the difficulty of designing weighting matrices for linear quadratic regulator (LQR), a multi-objective evolution algorithm (MOEA) based approach is proposed. The LQR weighting matrices, state feedback control rate and optimal controller are obtained by means of establishing the multi-objective optimization model of LQR weighting matrices and applying MOEA to it, which makes control system...
In this paper, an industry rectifier system based on the new rectifier transformer is introduced. In this new system, the continuously adjustable reactive power compensation and harmonic suppression are realized at the third winding of the new rectifier transformer. Based on this, the unique main circuit topological structure of the new system is analyzed, and then the main circuit parameters are...
In this paper, the authors present a new concept of four-phase rectification. The winding way of four-phase rectification, the principle of work and its harmonic have been analyzed. The change relations of the outputs of four-phase rectification with the trigger angle have been studied. The Simulation model of four-phase rectification by Matlab/Simulink has been established. The simulation experiment...
In the traditional AC/DC transmission system, to reduce the effect of harmonics to the AC system produced by the converter, filters and reactive power compensating equipments are installed in the primary side. This article presents a novel converter transformer and harmonic suppression scheme- filter commutated converter (FCC), which can greatly restrain the harmonic current from flowing into the...
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