The invention relates to the technical field of power systems, and discloses a transformer area user identification method based on principal component analysis and k-means clustering. The method comprises the steps of obtaining voltage data of a low-voltage side of a transformer and a user ammeter; performing principal component analysis on the voltage data to obtain a low-dimensional analysis object; determining the number k of the K-means clusters; calculating the data density of the to-be-clustered object, and determining an initial clustering centroid; Using k-means clustering algorithm for clustering objects to be clustered, and then the transformer area user relationship is identified. By the adoption of the scheme, identification reliability is improved, the problems that efficiency is low and potential safety hazards exist are solved, and hardware and labor cost is reduced; Multi-dimensional voltage is digitalized into few main components for analysis through a dimension reduction technology, so that the calculation amount of the algorithm is reduced, and the efficiency of the algorithm is improved; Regular k The means algorithm is improved, the transformer area and the phase of the user can be accurately and effectively identified, and the cross-transformer-area user attribution problem can be thoroughly solved.

A transformer area user identification method based on principal component analysis and k-means clustering

The invention discloses an out-of-step and oscillation center positioning system suitable for a T-connected multi-frequency system and a method thereof in the field of power system stability analysis. The out-of-step and oscillation center positioning system consists of a data acquisition module, an oscillation center positioning module, an out-of-step center positioning module and a result output module which are connected in turn. The out-of-step and oscillation center positioning method includes the steps of acquiring network structure parameters, generator power angles, a voltage amplitude of a T-connected central point O and ratios of the power angles to voltage amplitudes at two ends of a circuit; converting a T-connected equivalent three-machine system into three two-machine systems according to the acquired parameters; then constructing a multi-frequency system oscillation center and an out-of-step center positioning criterion; next, positioning the oscillation center and the out-of-step center according to the acquired parameters; and finally outputting oscillation center and out-of-step center positioning results. According to the invention, the out-of-step/oscillation center positioning of the T-connected multi-frequency system can be correctly and effectively analyzed and considered.

Out-of-step and oscillation center positioning system suitable for T-connected multi-frequency system and method thereof

The invention discloses a composite information out-of-step separation method and system for oscillation center migration. The method comprises the steps that according to variation values of variouscircuits in an electric power system, out-of-step oscillation centers in the circuits and voltage amplitudes of the out-of-step oscillation centers are determined; the voltage amplitude ratio and thephase angle difference of the two ends of each circuit are measured by means of a wide area measurement system, and the positions of the out-of-step oscillation centers are determined; and after it isjudged that the current electric power system is in an out-of-step state according to the out-of-step determination position condition and the out-of-step determination voltage condition and it is detected that at least one set out-of-step cycle exists in the circuits where the out-of-step oscillation centers are located, separation operation is conducted by an out-of-step separation device. It can be seen that the method and system are suitable for the condition that the out-of-step oscillation centers migrate, the positions of the out-of-step oscillation centers are re-determined after real-time migration of the oscillation centers, the most precise separation operation is achieved, the problem that an existing out-of-step separation device is insufficient in adaptability when the operation mode changes can be avoided, and the operation security and stability of the electric power system are improved.

Composite information out-of-step separation method and system for oscillation center migration

The invention relates to a splitting control method and device of a regional power grid, computer equipment and a storage medium. The method comprises the following steps of: receiving out-of-step early warning signals, wherein the out-of-step early warning signals are sent by observation stations when the out-of-step trend of the stations is detected, and the observation stations are transformersubstations positioned in the alternating current section area of the regional power grid; identifying the number of alternating current channels corresponding to the observation stations which send out the desynchronization early warning signals in a first set time period; if the number of the alternating current channels is larger than a preset out-of-step mark threshold value, selecting one observation station from each alternating current channel as a splitting station; and respectively sending a splitting signal to each splitting station, wherein the splitting signals are used for indicating the splitting stations to simultaneously perform the splitting operation. By adopting the method, each splitting station can timely and synchronously execute corresponding splitting operation, thereliability of the splitting operation is ensured, and the splitting effect can be improved.

Splitting control method and device of regional power grid, computer equipment and storage medium

The invention discloses an interconnected network thermostabilization key section recognizing method based on spectral clustering analysis. The interconnected network thermostabilization key section recognizing method includes the steps that 1, the network connection mode of an interconnected network, parameters of all branches, thermostabilization transmission limiting values of all the branchesand the electric generator output and load level are given to conduct load flow calculation; 2, the thermostabilization margin of all the branches is calculated according to the load flow calculationresult obtained in the step 1; 3, according to the interconnected network structure, an undirected weighted graph G (V,E) is constructed, weights of all edges in the graph are set and expressed with Wto form a G(V,E) connection matrix A and a stiffness matrix, and a Laplacian matrix L is calculated; 4, the feature value lambda and the feature vector rV are calculated, ascending sort is conductedon all the feature values of L, the feature vector rV2 corresponding to the second smallest feature value lambda2 in all the feature values is extracted; 5, the constitution branch of the interconnected network thermostabilization key section is screened out according to the interconnected network wiring relation and rV2, and all nodes of the interconnected network are divided into two regions.

Interconnected network thermostabilization key section recognizing method based on spectral clustering analysis

The invention relates to an alternating current system multi-frequency oscillation composite out-of-step separation criterion method based on wide area measurement information. The method is characterized in that the method comprises the steps that: a phasor measurement unit is utilized to measure voltages, phase angles and frequencies of buses at two sides of a separation section of the circuit, and the voltages, phase angles and frequencies a circuit are used as original data; a calculation center calculates a phase angle difference of the voltages of the buses at two sides of the circuit, and whether [delta][theta] is larger than 130 degrees is used as a starting criterion; the system out-of-step separation criterion is actuated; whether two coherent generator groups cross zero is calculated; a circuit set L is determined through a path searching algorithm; the phasor measurement unit is utilized to collect voltage frequencies at two sides of each circuit in the circuit set L at the zero-crossing moment; whether the derivative d[omega]/dt of bus frequencies at two sides of the circuit to time is smaller than zero is calculated; and the calculation center sends a separation instruction to control the separation of a separation device at an optimal section. The alternating current system multi-frequency oscillation composite out-of-step separation criterion method is scientific and reasonable, high in application, high in reliability and good in effect.

Alternating current system multi-frequency oscillation composite out-of-step separation criterion method based on wide area measurement information

The present invention relates to a spectral clustering-based voltage source converter based high voltage direct current transmission (VSC-HVDC) AC-DC system optimal splitting section search method. The method is characterized by comprising the steps of constructing an undirected edge weight graph G of a power system according to a power system structure; calculating an adjacent weight matrix W and a degree matrix A according to trend data; determining whether the system is unstable due to large disturbance; dividing a generating unit into k homolog groups according to a rotor power angle rocking curve after a generator is disturbed, and updating the adjacent weight matrix W and the degree matrix A; updating the adjacent weight matrix W and the degree matrix A according to a VSC-HVDC converter station placement; calculating a standardized Laplacian matrix LN; and clustering, according to the homolog group number k, feature vectors corresponding to the first k smallest feature values of the standardized Laplacian matrix LN, so as to determine the optimal splitting section, wherein the feature vectors are calculated by using a k mean value clustering algorithm. The method is scientific and reasonable, has high applicability and high reliability.

Spectral clustering-based voltage source converter based high voltage direct current transmission (VSC-HVDC) AC-DC system optimal splitting section search method

The invention belongs to the technical field of transient safety and stability and control after wind power is accessed to a system, and particularly relates to a principal component analysis based wind power plant group transient voltage clustering recognition method. When a power grid breaks down, measured voltage data of each wind power plant grid connection point in the system is only required, redundant useless information in a voltage time sequence is removed through principal component analysis, only the first two principal components with the greatest contribution rate are extracted, the two principal components are projected onto a two-dimensional plane, and then the relationship between the wind power plants is analyzed through a k-means clustering algorithm. Influencing factors of wind power plant grouping are dynamically analyzed online, and rapid recognition for wind power plant groups with strongly correlated transient behaviors can be realized, thereby being conducive to analyzing a system fault set of a region to which wind power is accessed in a large scale, planning the configuration capacity of each wind power plant reactive power compensation device and unified management and coordinated control among the wind power plants. The method has the advantages of ability of being scientific and reasonable, high applicability, high reliability and excellent effect.

Principal component analysis based wind power plant group transient voltage clustering recognition method

The invention discloses a protective circuit for inhibiting converter output current mutation and belongs to the technical field of security operation of power electronic equipment. The protective circuit is in serial connection with load in the alternating-current circuit output by a converter and comprises a current mutation inhibition bridge circuit and a by-pass switch K. Compared with a traditional protective circuit, the protective circuit has the advantages that the rising rate of short-circuit current of a system in early failure is inhibited through direct-current inductance in the current mutation inhibition bridge circuit, instantaneous automatic input without control on system response is achieved, the transient current is prevented from impacting and damaging the converter, the control system has enough response time to control disconnection of the electronic switch, the main converter circuit can be well protected, and the alternating-current circuit is unaffected by the current mutation inhabitation bridge circuit during normal operation; the protective circuit is simple in structure of the control circuit, convenient in implementation, reliable in performance, small in size, low in cost and the like.

Protective circuit for inhibiting converter output current mutation

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Alternating current system multi-frequency oscillation composite out-of-step separation criterion method based on wide area measurement information

Spectral clustering-based voltage source converter based high voltage direct current transmission (VSC-HVDC) AC-DC system optimal splitting section search method

Principal component analysis based wind power plant group transient voltage clustering recognition method

Protective circuit for inhibiting converter output current mutation