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This chapter presents three tuning mechanisms to enhance the stability and voltage regulation of existing real power systems without removing conventional automatic voltage regulator (AVR) and power system stabilizer (PSS) units. The proposed coordination methodologies use measurable signals for robust tuning of control proportional gains; therefore, they have considerable promise for implementation, especially in a large-scale multimachine system. In fact, the proposed control strategies attempt to make a bridge between the simplicity of control structure and robustness of stability and performance to satisfy simultaneous AVR and PSS objectives. The chapter addresses a tuning algorithm based on the described angle-voltage graph. In this, the controller uses the wide-area measurements data. The chapter presents the performance of intelligent fuzzy-based coordinated control for the AVR and PSS to prevent losing synchronism after a major sudden fault and to achieve appropriate postfault voltage level in multimachine power systems.