OPS-1 On-line Pre-decision System for Power System Emergency Control

Background

The development of modern power networks highlights the problem of stability,and the adaptability of stability control systems is essential to the secure and economic operation of large power systems.  OPS-1's adaptability comes from its capability of generating control decisions that always fit the system's current operating condition. OPS-1 can allow increased utilization of grid assets , avoid power system blackout and minimizes control cost, resulting in a significant financial and social benefit.

Principle Of Operation

OPS-1 integrates a unique technique for the quantitative analysis of general motion stability into an object oriented distributed parallel processing platform and a distributed stability control device.  It follows the current power system operating point, performs on-line stability calculation for a specified set of fault scenarios by using the stability margin provided by EEAC in order to obtain control decisions which make the system sufficiently stable at the minimum cost, and then periodically refreshes the decision table stored in the control device. Therefore it is adaptive to the development and change of operation of power systems.

Key Techniques

• Automatic fast control decision searching guided by the stability index from EEAC and on-line time-domain simulation
• An object oriented distributed parallel processing platform
• Quantitative stability analysis based on comprehensive modeling capabilities and whole-process trajectories
• Optimization and coordination of different control actions
• Multi-swing instability control decision searching technique

Features

• Control decisions always adaptive to current operating conditions and with minimum control cost
• Less than 5 minutes of decision table refreshing interval
• Greatly reduced scale of decision tables and maintenance work
• Greatly improved control accuracy
• Adaptability to unpredictable operating conditions
• Capability of system cascading faults control
• Integrated on-line pre-decision control of transient stability and thermal stability

Authentication

OPS-1's world-class level of technology, design, quality, reliability and application has been authenticated by the State Power Corporation in October 2002, particularly for its world-wide original contribution of quantitative stability analysis technology based on whole process trajectories, optimal control decision searching technology based on whole modeling and non-linear optimization, fault scenario oriented parallel processing platform, coordination technology of various types of control measures and control decision making technology of multi-swing instability.

Engineering Applications

• On-line prototype in operation in Eastern Shanxi Eastern Power System in December 1999
• Trial operation in Chuan Yu power system in 2001
• Industrial operation in Shandong power system in 2002
• Industrial operation in Guangdong Shaoguan power system in 2002

Off-line capabilities of OPS-1's optimal decision search software

OPS-1's core software is a powerful yet easy-to-use program that can be used for the off-line calculation of control decision table.

• Automatic fast searching for optimal control decisions guided by the stability index from EEAC and time-domain simulations with comprehensive modeling capabilities
• Multi-task parallel processing (load flow, decision search, MMI, etc.)