Digital Signal Processor-based Controller Design and Implementation for Self-excited Induction Generator

Abstract

This article presents the design and implementation of a digital signal processor (DSP)-based induction generator controller (IGC) to regulate the voltage and frequency of a single-phase self-excited induction generator (SEIG), which employs a three-phase squirrel-cage induction machine that is suitable for the stand-alone power mode and employing an unregulated turbine, such as micro-hydro power generation. A three-phase induction machine can be used to generate single-phase supply at constant voltage and frequency if the electrical load is constantly maintained at its terminals. A prototype model of a single-phase SEIG is developed, such that the load on the SEIG remains constant despite a change in the consumer load. The transient behavior of the developed DSP-based SEIG-IGC system at different operating conditions, such as application and removal of static (resistive and reactive) and dynamic (singlephase induction motor) load, is investigated to demonstrate the capabilities of the proposed IGC.

Implementation of Voltage Controller of Single-phase Self-excited Induction Generator

“…e 7 (and e 5 ) is always complementary of e 8 (and e 6 ), as shown in Figure 2(d). The EMI filter removes the high-frequency EMI interference generated by the CMOSintegrated circuit of the inverting amplifier and amplifier, represented by blocks (13) and (14) in Figure 1(af). The outputs of blocks (15) and (16) (signals e 8 and e 7 ) are fed, respectively, to AND gate blocks (9) and (8) in Figure 1(a) as a third inputs.…”

“…Block (12) is a zero-crossing detector, for which output e 4 is a square wave, as shown in Figures 2(b) and 2(c). e 4 is fed to amplifier block (14) and inverting amplifier block (13) in Figure 1(a). e 5 is k times e 4 and e 6 is -k times e 4 , and both signals are square wave.…”

“…Numerous publications on steady-state and dynamic analysis of self-excited induction generators (SEIGs) and several schemes for improving voltage regulation of SEIGs based on the electronic load controller (ELC), static VAR compensator (SVC), and distribution static compensator (DSTATCOM) have been well documented in [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. For constant voltage operation at varying loads, it is necessary to adjust the excitation reactive power continuously with loads.…”

STATCOM based voltage and frequency regulator for self excited induction generator

“…The voltage regulation techniques of SEIG with the help of switched capacitors [3], static VAR compensator (SVC) [4][5][6] are available in the literature. The terminal voltage and frequency can be kept constant by keeping the load on SEIG constant through a load controller [7][8][9][10][11][12]. The electronic load controller keeps the load on SEIG constant through a dump load which results in constant power operation with fixed capacitors for excitation.…”

Digital Signal Processor Based Fuzzy Voltage and Frequency Regulator for Self-excited Induction Generator

“…The electronic load controller keeps the load on a SEIG constant through a dump load, which results in constant power operation with fixed capacitors for excitation. A digital signal processor (DSP) based mark space ratio controlled load controller for the SEIG was presented in [13][14][15]. The mark space ratio DC chopper control reflects random harmonics to the AC circuit.…”