11 results about "HVDC converter station" patented technology

The present application relates to the technical field of power system, discloses a kind of multi-level DC sending end small signal stability evaluation method, device, equipment and medium, the present application considers the coupling influence between different heterogeneous devices, to network type new energy converter, network type energy storage converter, network type load converter and modular multi-level high voltage direct current converter station are carried out frequency domain impedance modeling, and based on the equivalent impedance model of each device, the frequency domain impedance network of all-electric system is constructed, the small signal stability of frequency domain impedance network is analyzed using generalized Nyquist stability criterion, the Nyquist diagram of impedance ratio on the two sides of voltage source and current source in frequency domain impedance network is determined The small signal stability of all-electric system under AC / DC hybrid scene, so as to provide an effective evaluation means for the stable operation of AC / DC hybrid all-electric system.

The present disclosure relates to a direct current switchyard configured for a bipolar high voltage direct current system, the direct-current switching station comprises a common bus which is a positive electrode, a negative electrode and a neutral part, a plurality of sub-buses of the positive electrode, a plurality of sub-buses of the negative electrode, a plurality of sub-buses of the neutral part, a plurality of high-speed direct-current circuit breakers with high-current interruption capability, and a plurality of direct-current switches with non-current interruption capability, each sub-bus of the anode and the cathode is connected to its respective common bus via a respective high-speed DC circuit breaker of a number of high-speed DC circuit breakers, and wherein each sub-bus of the anode and the cathode is connected to at least one high-voltage DC power transmission medium via a respective DC switch of a number of DC switches, and each high-voltage direct-current power transmission medium is also connected to a high-voltage direct-current converter

The invention relates to an extra-high voltage direct current converter station six-split conductor clamp fitting, which comprises a bus clamp, a sub-wire clamp and a locking assembly, and is characterized in that the bus clamp is provided with two semicircular cylinders which can be in butt joint to form a mother conductor clamping cavity, and the head ends of the semicircular cylinders are provided with semicircular check rings. The number of the sub-wire clamps is six, the sub-wire clamps are distributed on the outer side face of the check ring of the bus clamp, and each sub-wire clamp comprises a wire penetrating cylinder, an arc-shaped clamping plate and a puller bolt. The locking assembly comprises a front thread head, a rear thread head, a locking cylinder and a locking rod. The locking rod comprises a rod body and an anti-disengaging head. Through the closed-loop anti-loosening structural design of the locking rod and the locking cylinder, the problem that a traditional wire clamp bolt is prone to loosening is effectively solved, the locking rod penetrates through the check ring and the puller bolt to limit the rotation freedom degree of the bolt, the locking cylinder abuts against the anti-loosening head after being screwed, double anti-loosening is formed, dynamic loads such as wind loads and electromagnetic vibration are resisted, it is guaranteed that a wire is clamped stably, and the service life of the wire clamp is prolonged. And the falling risk is avoided.

1. The name of the design product: flexible HVDC converter station monitoring system graphical user interface for computer. 2. The use of the design product: the design product is applied to computer, used for running program. 3. The design points of the design product: the content of the graphical user interface in the screen of the product, wherein the computer is the existing design. 4. The picture or photo best indicating the design points: front view. 5. The display screen panel is the conventional design, and the rear view, left view, right view, top view, bottom view and perspective view are omitted. 6. The use of the graphical user interface: the graphical user interface of the product is the software interface of the flexible HVDC converter station monitoring system. 7. The change state description of the graphical user interface: the front view is the "three-terminal system diagram" displayed by the system; the interface change state diagram is the interface displayed after clicking "station main wiring" in the front view interface.

The application discloses a kind of half indoor arrangement's back-to-back hvdc converter station starting loop, comprising: several groups of bridge arm reactor, the bridge arm reactor includes juxtaposition operation's first bridge arm reactor and second bridge arm reactor;The side of first bridge arm reactor is connected to bypass disconnecting switch;The side of second bridge arm reactor is connected to starting resistance by support insulator;Starting resistance and branch current measuring device are connected in series, and the starting resistance is connected in parallel with the bypass disconnecting switch and then connected in series with loop current measuring device;The loop current measuring device is connected in series with voltage measuring device, HGIS and starting loop lightning arrester in turn.This application can reduce the noise influence of equipment, avoid the solarization aging of reactor, slow down the aging of protective layer on the surface of reactor, effectively reduce the dirt of external insulation of equipment, reduce the influence of dust and external environment on equipment, and is conducive to the operation and maintenance of equipment.

The invention provides a method and device for evaluating the local inertia supporting capacity of a new energy delivery type AC / DC power system, and relates to the technical field of power system operation and control, and the method comprises the steps: building a parameterized differential-algebraic equation model; deriving an inertia distribution matrix of the power system by using a generalized energy framework, and calculating a local inertia supporting capability index of each network node based on the inertia distribution matrix; determining the network region of which the index value is lower than a preset index threshold value as an inertia weak region, and predicting the dynamic evolution trend of the inertia weak region based on a hybrid automaton model to obtain a prediction result; and establishing a mapping relation between the inertia supporting capability of the inertia weak area and the commutation failure risk of the high-voltage direct-current converter station, and evaluating the stability margin of the system. According to the method provided by the invention, the problem that the inertia space-time heterogeneity cannot be identified and evaluated by a traditional method can be solved, and accurate identification and risk evaluation of a region with weak local inertia supporting capability can be realized.

The present application relates to the technical field of noise identification, and particularly relates to a main sound source noise identification method and system for a flexible direct current converter station. Current of the converter station and audio time sequence data of each monitoring point are acquired; time-frequency diagrams are obtained by processing the audio time sequence data, amplitude variation differences of different monitoring points under the same frequency point are analyzed, amplitude variation of the target point frequency point is adjusted accordingly, an amplitude variation index is obtained, and whether the noise is from the converter transformer is analyzed conveniently; for the noise caused by the magnetostriction of the converter transformer core, the vibration frequency is stable, and the amplitude varies synchronously with the current, so in the target point time-frequency diagram, the correlation between the amplitude variation index and the current time sequence data and the difference of the time sequence characteristics under each frequency are analyzed, a multi-frequency synchronization index is determined, and the possibility that the frequency component is from the magnetostriction effect of the core is reflected; finally, the amplitude variation and the multi-frequency synchronization index are fused, noise characteristics are comprehensively analyzed, and noise source identification accuracy is improved.

The application discloses a kind of capacitive capacity monitoring method and system of flexible direct current converter station bushing, it is related to the field of flexible direct current transmission equipment on-line monitoring and electrical parameter identification technique, including in the bushing of flexible direct current converter station bushing end screen and ground setting capacitor voltage divider and constructing series capacitor measurement structure, acquisition bushing primary voltage signal and end screen current.Primary voltage signal and end screen current are carried out synchronous signal preprocessing, using wavelet transform and filtering strategy to remove noise and extract frequency domain features.Capacitive capacity coupling relationship of bushing structure parameter is calculated based on frequency domain features, and abnormal point is judged by establishing capacitive capacity change identification model and combining temperature and humidity data.The method described in the application effectively overcomes the problems of static analysis lag, single variable misjudgment and insufficient frequency spectrum resolution, realizes real-time monitoring of flexible direct current bushing capacitive capacity, abnormal dynamic early warning and system improvement of model adaptability, and significantly enhances the safety operation guarantee capability of equipment throughout its life cycle.

The application discloses a kind of considering lightning arrester parameter optimization's flexible direct current converter station insulation coordination design method, belong to high voltage direct current transmission and insulation coordination design technical field, adopt the method that electromagnetic transient simulation and statistical analysis are combined, by constructing the overvoltage statistical model and insulation resistance statistical model of key node of converter station, introduce statistical safety factor as insulation coordination evaluation index, and the economic cost of risk quantification is failed to insulation;Considering the residual voltage level of lightning arrester, energy level and arrangement position, establish the multi-objective optimization function model considering the deviation of statistical safety factor, insulation failure risk cost and lightning arrester cost;Using statistical safety feedback risk convergence iteration algorithm, the optimization function model is solved, to determine the insulation coordination of flexible direct current converter station, the present application can avoid the excessive dependence on experience margin of traditional design, realize lightning arrester parameter and insulation level collaborative optimization while the safe operation of flexible direct current converter station, reduce engineering investment and operation risk.

The invention discloses a measurement board card fault prediction method and system based on multi-source data fusion and deep learning, and the method comprises the steps: collecting multi-channel time sequence monitoring data of a measurement board card, carrying out the data enhancement and cleaning of a multi-channel time sequence monitoring signal, obtaining first data, inputting the first data into an improved TimesNet model, and carrying out the data enhancement and cleaning of the multi-channel time sequence monitoring data; the model comprises a plurality of TimesBlock modules in residual connection and a plurality of multi-head attention mechanism modules, and the TimesBlock modules perform feature extraction on the first data to generate a preliminary feature vector; the multi-head attention mechanism module focuses the fault sensitive features of different dimensions through a plurality of attention heads so as to generate enhanced feature vectors; and generating a fault prediction result of the measurement board card by using the enhanced feature vector. According to the method, early fault diagnosis and fault early warning of the measurement board card of the extra-high voltage direct current converter station can be realized.