31 results about "Dynamic security assessment" patented technology

This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation:Xtest=Xspost+0.99(XUEP−Xspost)where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.

A risk index-based dynamic safety assessment method for power systems, including establishing a risk model based on the probability of the expected accident and the impact of the expected accident, screening and sorting the expected accidents, and obtaining the dominant expected accident set; Carry out load flow analysis calculation and record the voltage of all nodes in the system for the leading anticipated accident V and voltage phase angle δ ; Based on the polynomial form of the transient stability margin and the obtained power flow data, calculate the probability distribution of the transient stability margin and its mean and standard deviation; based on the established risk model, use the probability distribution of the transient stability margin and The severity function calculates the risk index of the expected accident; based on the risk index sought, the corresponding preventive control and emergency control measures are taken. The method of the present invention considers the uncertainty of load prediction, quantitatively combines the probability and severity of accidents, which are two factors that determine system safety, and can comprehensively reflect the impact of accidents on the entire power system, thereby better coordinating The relationship between the safety and economy of power system operation.

The invention provides a trend load flow calculating method based on online status estimation and real-time scheduling plans. The method comprises the following steps of determining future trend operating mode data of a power grid; performing rationality identification and automatic adjustment on real-time scheduling plans; establishing a multi-section active power control model to perform automatic fine-tuning generation active power control; performing reactive power voltage local control, and distributing reactive power unbalance of hub nodes; performing load flow calculation to generate load flow calculation data used for power grid future trend dynamic safety assessment. The trend load flow calculating method based on online status estimation and real-time scheduling plans solves the problem that traditional online dynamic safety assessment algorithms cannot effectively analysis future power grid short safety and stability within a short time, and by analyzing further power grid safety change trend in advance, assists scheduling personnel to arrange and adjust current operating manners.

The invention provides a memory-based online data integration method. Effects of exactly and quickly judging the state of a power supply system under a specific fault, meeting the stability analysis of an intelligent power grid scheduling technique supporting system and online dynamic safety estimation on the power supply system, and obtaining practical data capable of being applied to load flow calculation of a large power supply system can be realized by quickly and effectively reading online / offline data and reading in a server in a certain form. According to the memory-based online data integration method disclosed by the invention, a problem that a complex power supply system can not model and analyze when a running state of the complex power supply system has large change such as catastrophe at a trend of large power grid interconnection is solved.

Disclosed is a power distribution network fault recovery method based on real-time contingency sets. The method includes the steps of determining a contingency severity index firstly, obtaining the expected value of influence of contingencies by combining the contingency severity index with the probability of occurrence of the contingencies, sorting the contingencies according to the severity levels according to the expected value of influence of the contingencies, screening out the contingency sets needing fault recovery analysis, updating the contingency sets within each time period, and outputting corresponding fault recovery schemes in real time. The real-time contingency sets are established, the contingencies with the small expected value of influence are omitted, only the fault recovery schemes of the contingencies with the high expected value of influence are analyzed, the number of the contingencies needing to be analyzed by on-line dynamic safety assessment is largely decreased, the calculation time for analysis of the fault recovery schemes is shortened, and real-time fault recovery plans are achieved before faults occur.

A method for dynamic security assessment of power systems based on a hybrid integrated model, including the following steps: Step 1: Construct corresponding dynamic security indicators, and establish an initial sample set including several power system operating variables and corresponding security indicators; Step 2: Construct high-efficiency samples set; Step 3: Obtain a dynamic security assessment model that can accurately evaluate the operating status of the power system; Step 4: Based on the real-time monitoring data of the synchronous vector measurement device, select the key characteristic variable data and input it into the DSA model to realize the online DSA of the power system. The purpose of the present invention is to provide a dynamic security assessment method of power system with good generalization ability. Damage caused by failure.