In modern thermo-electric plant of large capacity, the backwater heating system and the generator-transformer unit both are the most important parts. The function of the backwater heating system can directly influence both economic benefits and the safety in production of the plant. And, the coordinated control system is the key factor for keep the stability in operation of the power system.The object of study is the second extension project of Qujing thermo-electric Plant (2x300MW) of Yunnan. Two major pro...