The reference signal generated by the fuzzy logic controller was given as input to the UPQC switching module. It is found that droop control is very suitable for both DG and off-grid conditions. In both cases, are the same. Membership function values are assigned to the linguistic variables, using seven fuzzy subsets: Research objectives are described in section 1.
The rest of this section describes briefly the related issues of this research includes DG and microgrids, power quality problems, mitigation techniques, CPDs and real-time simulation. Thus the THDIs is minimized and the grid current is kept in phase with the grid voltage. It also has been shown that the dc capacitor control of the right-shunt UPQC structure is simpler. Low sensitivity to line impedance unbalances and harmonic power sharing capability are the other advantages of a droop controller. To justify the robustness of the control algorithm for voltage harmonic mitigation, a three-phase SCR rectifier with resistive load on the DC side is connected. Further, the output of FLC controls the switch in the inverter.
In this research the UPQC is only simulated for minimizing the voltage sag and total harmonic distortion in the distribution system but the main purpose of UPQC is to compensate for voltage imbalance, reactive power, lirerature current, and harmonics and these parameters will be considered in the near future.
In the case of bi-directional power flow, Position 1 with direct control shows the better performance than indirect control. Each path followed by an ant is associated with a candidate solution for a given problem.
In this paper Max-Min method is used. Suffixes 1 and 2 denote two stages in time, on the other state of the power supply for UPQC taking action. These rules are determined by the no. Both the shunt and series APFs are current controlled. The output membership function of each rule is given by the minimum operator and maximum operator.
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The switching is carried out successfully within the limiting condition as shown in Fig 5. Applications of some advanced mathematical tools in general, and wavelet transform in particular, in power quality are also applied. Due to the connection of a single-phase diode rectifier, a current of The technique for reference current generation has been presented in Figure 4. The lirerature connected in parallel, together with its control circuit, forms the shunt compensation circuit.
Table 2 Voltage sag mitigation performance. Subsequently in [ 18 ], the authors emphasize enhancement of power quality by using UPQC with fuzzy logic controller FLC and artificial neural network ANN controller on the conventional proportional-integral PI controller.
In that case, the simulator must be more powerful. The THD of the supply current is 3. UPQC can also be operated in different possible configurations for single-phase 2-wire and 3-phase 3-wire and 4-wire networks, diverse compensation approaches, and recent developments are also found in the field [ 7 ].
The triangular shape of the membership function of this arrangement presumes that for any reveiw input there is only one dominant fuzzy subset. Therefore, 20 and 21 are the control equations which will decide that the optimum angle of voltage literatture by the UPQC could be obtained through the proposed ACO-FL control technique Figure National Center for Biotechnology InformationU.
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In 3C mode, the successive module tracks the current of the previous module to achieve an equal current distribution, and the first module tracks the last one to form a circular chain connection.
Since the numerical variables are converted into linguistic variables, mathematical modelling of the system is not required in FLC. UPQC can also be operated in different possible configurations for single-phase 2-wire and 3-phase 3-wire and 4-wire networks, diverse compensation approaches, and recent developments are also found in the field [ 7 ].
With the increase of renewable energy penetration in the grid, power quality PQ challenges of the medium to low voltage power distribution system is becoming a major area of interest. The set of FLC rules is derived from.
The other advantage is that, this islanding detection and reconnection method have been carried out as uppqc secondary control in Level 2, i.
These PQ problems related to the most commonly used DG systems solar, wind, hydro and diesel are given in Table 1. The Instantaneous reactive power theory , which is valid in both for steady-state and transient operation and is characterised by the simplicity of its calculations, has been used to generate the reference current.
There are an infinite number of solutions for V pen. It is found that droop control is very suitable for both DG and off-grid conditions.
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Operation in islanding multi-level or multi-module mode — possible mode — difficult iii. The input error E k for the FLC can be calculated from the maximum power point as given in 20 and If the exact values of error and change in error are small, they are divided conversely and if the values are large, they are divided coarsely.
Simulations are carried out with PI as well as fuzzy logic controller for both p – q and Id – Iq control strategies by considering different voltage conditions and adequate results were presented in [ 24 ].