PDCA And SDCA Cycled Based Power System Blackstart Service Maintenance

In order to improve the grid security level, this paper studies the conditions for maintain power system black start ability. It proposed the power system black start services maturity models to normalize the standards of power system black start ability. And a hybrid PDCA and SDCA cycles based management system was designed for the maintenance of power system black start ability. It was demonstrated during the two times power system black start experiments of Shandong power systems.The proposed power system black start services maturity models were designed in view of the present situation of lack of grading control in the power system black start ability mantenance process considering operating risks. Through the establishment of hierarchical evaluation factors set, the grey fuzzy relations were given to evaluate operating risks. Grey fuzzy algorithms was adopted in the process of black start the comprehensive evaluation. According to the principle of selecting the maximum membership degree, the maximum reliability evaluation for the final judgment of the corresponding evaluation result.According to the lack of an effective mechanism to maintain and continuous improve the black start capability of the system, and to achieve a dynamic cycle management of hazard identification and risk control, it was proposed a black start services management mechanism based on PDCA and SDCA mode to achieve standardized management of black start services and field tests. The black start experiment management of PDCA mode is proposed according to the risk management mechanism, accident priority control and continuous improvement implementation principles. Shangdong power grid black start experiment is implemented successfully with the standardization management. In the Planning stage during implementation of PDCA cycle management, three risk factors including abnormal Parameters of the pumped-storage unit with low load, DC power shortage for breaks and issues of synchronism parallel operation are early detected and eliminated through rectification with several phases. In the Doing stage, test is implemented with four steps including adjustment of Operation Mode, shutdown of units, black start test and restoration of subsystem. Time is controlled accurately during test procedure. In the Checking stage, the black start ability of pumped-storage unit and large thermal power unit is analyzed with recording data of test. Test objectives are fully verified. In the Action stage, prior schemes of black start are revised. Test plan and dispatching operation are developed for the next cycle. Following the PDCA pattern, the high-risk large-cost experiment involving wide scopes realizes the closed-loop management with feedforward control, concurrent control and feedback control. It effectively guarantees the smooth implementation of the experiment. Moreover, the continuous improvement action promotes black start capabilities to be more in line with actual requirements.As the PDCA, SDCA used the project plan methods. Black start services program related personnel tasks were converted to a set of standard processes of organization and management. It can effectively guarantee the standard will be implemented. Through the quantification decomposition of black start services, it can objectively decide how to control and improve the service project execution process. Based on SDCA cycle, black start service management, to the whole black start service management processes great straight-ahead, ensure the black start quality of service.Finally, according to the new standard re-enacted the shandong grid black start scheme with fully electric checking, and based on Tai-an pumped-storage black start field tests was carried out. The field tests results verifies the basic thought of service plan.