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With the purpose of analyzing the crosstalk of multi-conductor transmission lines, an analytical approach — the lumped parameter model method is presented. First, the physical model of multiple adjacent transmission lines is established by using the 2D field solver of the Ansoft Q3D software and the unit length electrical parameters such as capacitance matrix and inductance matrix of transmission...
According to the power quality problems of micro-grid, this paper presents a control program of the Unified Power Quality Conditioner (UPQC) to improve the micro-grid power quality. The shunt side of UPQC is used to eliminate the harmonic current brought by nonlinear load into the micro-grid. And the conditioner series part is used to suppress distributed new energy generation intermittence. In the...
To improve the dynamic performance of the dual PWM converter, a new control strategy named direct capacitor power control based on sliding mode variable structure (SMC-DCPC) was proposed. In order to control the capacitor power and the grid-side reactive power to be zero, two sliding mode controllers were designed in the inner power loop. To realize the decoupling of grid-side active power, load power...
With the method of instantaneous symmetrical components, positive, negative and zero sequence components can be gained. The traditional instantaneous symmetrical components are usually implemented under dq0 synchronization reference frame on condition that low-pass filter is adopted in, which causes aggravated dynamic performance. To solve this problem, this paper presents a novel algorithm of instantaneous...
Gansu Jiuquan ten million kilowatts wind power base covers the SVG / STATCOM, TCR type SVC and MCR type SVC. The application effects of these devices need experimental verification, so the device performance test is carried out. Considering the grid structure, the operation of wind farms, referring to the relevant national standard, test items are raised, test methods are proposed. Three compensation...
In this paper, an improved predictive current controlled three phase voltage source pulse width modulation (PWM) rectifier was described. This method was based on the discrete mathematical model. The desired ac-side current was predicted according to minimizing power errors target function in a fixed time interval. This control system realized fast tracing by selecting switching states based on the...
Current-feedback BUCK Converter, namely CCBUCK, which is the dominant component of SMPS system, have rich dynamical characteristic. For revealing internal relation between stability and system circuit parameters, Dynamical Characteristic for Current-feedback BUCK Converter was studied. Two closed loop circuit model based on PI regulator was built. The simulation model for CCBUCK, controlled by peak...
System with mechanical speed sensor has lower reliability and higher cost. Traditional direct torque control method has disadvantages of big ripples on current and flux linkage and torque. To solve these problems, the Extended Kalman Filter is established to estimate both stator flux linkage and rotor speed. Therefore, speed sensorless direct torque control for surface permanent magnet synchronous...
Integrating the character of parallel power quality compensator and series power quality compensator, unified power quality conditioner (UPQC) has generally been accepted as a new electric power quality conditioner which has a good development prospect. But its widely adopted harmonic voltage measurements and harmonic current measurements based on instantaneous reactive power theory still have flaws...
To solve the problem that traditional PI controller is affected by the change of motor parameters and thus can't meet the high accuracy requirement, fuzzy PI speed controller is proposed. Current model of permanent magnet synchronous motor is built and motor speed is identified based on model reference adaptive theory. Speed adaptive law is derived according to Popov theory. Fuzzy PI controlled PMSM...
The growing interest in power quality has led to a variety of devices of mitigating power quality problems. Integrating the character of parallel power quality compensator and series power quality compensator, unified power quality conditioner (UPQC) has generally been accepted as a new electric power quality conditioner which has a good development prospect. A new harmonic signal detection algorithm...
Aiming at the diversity and nonlinearity of the elevator system control target, an effective group method based on a hybrid algorithm of genetic algorithm and neural network is presented in this paper. The genetic algorithm is used to search the weight of the neural network. At the same time, the multi-objective-based evaluation function is adopted, in which there are three main indicators including...
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