A Voltage Modulated DPC Approach for Three-Phase PWM Rectifier

 ABSTRACT:

In this paper, a voltage regulated direct power control because three-stage beat width balanced rectifier is proposed. With the proposed strategy, the differential conditions portraying the rectifier elements are transforming from a straight time-fluctuating framework into a direct time-invariant one. Along these lines, the customary criticism and feedforward controllers are material therefore the autonomous control of dynamic and responsive forces.

FRAMEWORK

The proposed technique is ensured that the shut framework is internationally exponentially steady. A criticism linearization technique is likewise utilized because creating the dynamic power reference of internal circles. At long last, some trial tests are directed to check its adequacy.

 

CIRCUIT DIAGRAM:

Fig. 1. Block diagram of the proposed method for the rectifier.

  

EXPECTED RESULTS:

  

Fig. 2 Transient response and steady-state performance of the system under step change of the DC load. PI method: (a) DC voltage, (b) DC current, (c) injected current, (d) active power, (e) reactive power; PI plus feedforwar method: (f) DC voltage, (g) DC current, (h) injected current, (i) active power, (j) reactive power; Proposed method: (k) DC voltage, (l) DC current, (m) injected current, (n) active power, (o) reactive power.

Fig. 3. Transient response and steady-state performance of the system under step change of the DC load when parameters of the controller are mismatched. 75%L: (a) DC voltage, (b) DC current, (c) injected current, (g) active power, (h) reactive power; 75%C: ( (d) DC voltage, (e) DC current, (f) injected current, (i) active power, (j) reactive power.

Fig. 4. Transient response of the system with the proposed method under step change of the DC load when the grid voltage has 5th and 7th harmonics. (a) voltage spectrum (THD=1:0%), (b) currents spectrum (THD=2:5%), (c) DC voltage, (d) DC current, (e) injected current, (f) active power, (g) reactive power.

Fig. 5. Performance of the proposed method when the inverter is connected. (a) DC voltage, (b) DC current, (c) injected current, (d) active power of rectifier, (e) active power of the inverter, (f) output current of the inverter.

CONCLUSION:

The proposed Voltage Modulated DPC therefore the PWM rectifier is anything but difficult to control the dynamic and responsive powers autonomously by utilizing feedforward and criticism controllers. Test results demonstrate that the proposed technique has quick transient reaction as well as great relentless state execution.

PWM

Under the proposed strategy, it isn’t difficult to dissect and structure because rehearsing engineers, since the framework is changed into a LTI one. We demonstrate the proposed technique is vigorous to the unsettling influence with the investigation therefore the shut circle framework is exponential stable.

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