12 results about "Subsynchronous resonance" patented technology

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

The application discloses a method and system for suppressing subsynchronous resonance of a doubly-fed fan system based on thermal mass energy storage, establishes a nonlinear disturbance observer and a non-singular fast terminal sliding manifold observer based on a state space model of a thermal mass energy storage converter; when it is determined that the subsynchronous oscillation of the doubly-fed fan system occurs, the input voltage and the output current of the thermal mass energy storage converter are collected in real time, the estimated mismatch disturbance vector output by the nonlinear disturbance observer and the sliding manifold output by the non-singular fast terminal sliding manifold observer are used as the input quantities of a fast terminal sliding mode controller, the fast terminal sliding mode controller adopts a two-stage voltage approach law to output the regulating quantity of the input voltage of the thermal mass energy storage converter, and the thermal mass energy storage converter regulates the input voltage according to the regulating quantity to suppress the subsynchronous oscillation of the system. The application utilizes the current support capability of the thermal mass energy storage to provide necessary current support when the system fails, thereby effectively suppressing the subsynchronous oscillation of the doubly-fed induction generator system and improving the strength of the power grid.

The invention relates to the technical field of new energy grid connection, and discloses a double-fed wind power plant subsynchronous oscillation suppression device and method based on GCSC-SSRDC. The bottleneck problems of insufficient robustness and poor adaptability of an existing suppression scheme in complex actual engineering can be solved to a certain extent. The device comprises a gating series capacitor GCSC used for replacing a fixed series compensation capacitor and providing a fixed capacitive reactance compensation line inductive reactance, a power dispatching controller used for obtaining a power signal of a power transmission line and outputting a fundamental frequency compensation reactance instruction after processing the power signal through a first-order low-pass filter, and a subsynchronous resonance damping controller SSRDC used for obtaining a current signal of the power transmission line and outputting a fundamental frequency compensation reactance instruction after processing the power signal through a second-order low-pass filter. The control signal generation module is used for superposing the fundamental frequency compensation reactance instruction and the additional reactance instruction and then converting the superposed fundamental frequency compensation reactance instruction and additional reactance instruction into a turn-off pulse signal of a gate control series capacitor switching device through an amplitude limiting, table lookup and pulse generation unit; and suppression of subsynchronous oscillation is realized.

The embodiment of the application discloses a control method for inhibiting subsynchronous oscillation of a doubly-fed fan and related equipment, relates to the technical field of stability control of power systems, and directly estimates a subsynchronous frequency based on inherent parameters such as series compensation capacitance reactance, equivalent inductance and grid synchronous frequency, so that the influence of grid resistance parameter change on the estimated value of the subsynchronous frequency is excluded; based on the estimated value of the subsynchronous frequency obtained above, a frequency spectrum analysis range is quickly locked; through fast Fourier decomposition of rotor current and in combination with an amplitude comparison strategy in the preset frequency spectrum analysis range, an oscillation frequency, namely a subsynchronous resonance frequency, is accurately locked, and the subsynchronous resonance frequency in the rotor side control system of the doubly-fed fan is filtered out, so that oscillation is inhibited.

The application discloses a method for suppressing subsynchronous resonance of a doubly-fed wind turbine based on additional electromagnetic torque, and the method comprises the following steps: constructing a transfer function between a rotor-side electromagnetic torque variation and a rotor speed disturbance by a flux linkage equation of a three-phase asynchronous motor and a rotor-side electromagnetic torque expression of the three-phase asynchronous motor; deriving a generation mechanism of the subsynchronous resonance from a physical layer according to the transfer function; and adding a subsynchronous resonance damping control strategy for additional electromagnetic torque of a target doubly-fed wind turbine in a d-axis controller of a rotor-side converter according to the generation mechanism of the subsynchronous resonance, so that the target doubly-fed wind turbine generates an electromagnetic torque which is opposite in phase to the rotor speed disturbance, thereby effectively suppressing the subsynchronous resonance of a power transmission system for transmitting wind power from the doubly-fed wind turbine to outside through a series compensation transmission line.

The invention discloses a power system subsynchronous resonance energy recovery device and method, and belongs to the technical field of power systems. The device comprises a band-pass filtering unit, a bypass switch unit, a three-phase monitoring unit, a control unit, a three-phase thyristor full-bridge circuit and a three-phase inductance energy storage module. The band-pass filtering unit is connected in parallel to a unit outlet bus, and the bypass switch unit is connected in parallel to two ends of the filtering unit to realize time-sharing switching; and the control unit identifies resonance according to the monitoring signal and controls the thyristor full-bridge circuit to be switched between a rectification mode and an inversion mode. The method comprises the following steps: bypass filtering in standby, and monitoring power frequency; when resonance exceeds a threshold value, filtering and rectifying energy storage are carried out; after resonance is eliminated, bypass filtering is carried out, and inversion feedback energy is sent to a power grid. According to the invention, through cooperation of the pre-filtering and the bypass switch, precise detection, rapid suppression and energy loss-free recycling of subsynchronous resonance are realized, and the system economy and the equipment reliability are greatly improved.

This invention provides a method and apparatus for suppressing subsynchronous resonance in a wind-fire bundled power transmission system with series compensation. The method includes: dq decoupling control based on stator dynamic flux compensation; superimposing the stator current of the doubly-fed induction generator (DFIG) onto the rotor reference voltage of the turbine-side converter via a transfer function; and optimizing the phase angle and amplitude characteristics of the transfer function within the subsynchronous frequency band to achieve overall optimization of the damping characteristics of the DFIG in the subsynchronous frequency band. This application achieves suppression of subsynchronous resonance in the wind-fire bundled power transmission system by comprehensively reshaping the impedance characteristics of the DFIG in the subsynchronous frequency band and optimizing its damping characteristics.

The invention provides a subsynchronous resonance energy consumption suppression method, system and device based on a dynamic series compensator and a medium, and the method comprises the steps: obtaining a subsynchronous current through filtering and screening based on a grid-connected point current on a new energy power transmission line; based on the subsynchronous current and the virtual impedance, a suppression modulation wave is obtained through calculation; generating a control modulation wave for controlling the capacitance voltage deviation of the dynamic series compensator based on the fundamental current; and adding the suppression modulation wave and the control modulation wave to obtain a control signal of the dynamic series compensator, and carrying out suppression consumption on the subsynchronous resonance energy. According to the invention, the subsynchronous resonance is suppressed by suppressing the modulated wave, and meanwhile, the subsynchronous energy of the dynamic series compensator is discharged in real time by controlling the modulated wave, so that the condition that protection is triggered to quit operation due to overhigh capacitor voltage is prevented, and the continuity and reliability of the subsynchronous resonance suppression function are fundamentally ensured; therefore, stable transfer and consumption of the subsynchronous resonance energy are realized.

The invention discloses a STATCOM (Static Synchronous Compensator) controller DQ link parameter configuration method for suppressing subsynchronous resonance, which comprises the following steps of: establishing a target unit and an electromagnetic transient simulation model of a power grid in which the target unit is located in electromagnetic transient software, and defining a series of representative system operation modes covering various power grid operation scenes; for each target suppression mode, in each system operation mode, executing open-loop excitation mode damping effect scanning to obtain a relation curve between the oscillation amplitude of the target suppression mode and the DQ rotation deviation angle in each system operation mode; obtaining a group of local optimal DQ rotation deviation angles of each target suppression mode i corresponding to different system operation modes; and performing statistical analysis on each group of local optimal DQ rotation deviation angles, and selecting a robust common angle as a final fixed configuration parameter of the target suppression mode.

This invention discloses a method and system for configuring the modal gain parameters of a STATCOM controller to suppress subsynchronous resonance, belonging to the field of electrical equipment and electrical engineering technology. The method includes: defining a set of typical operating modes of a power grid; identifying a target suppression mode for each operating mode within the set of typical operating modes; performing open-loop excitation and parameter scanning in multiple scenarios for the target suppression mode, and recording the results; determining the effective range of positive damping under each operating mode based on the recorded results; calculating a common safety configuration range based on the effective range of positive damping; and selecting the optimal modal gain parameters within the common safety configuration range according to preset principles to configure the STATCOM controller to suppress subsynchronous resonance in the power grid system. This invention addresses the problems of existing parameter tuning methods, such as insufficient adaptability to changes in system operating conditions, reliance on experience, and lack of systematic multi-scenario verification.

The application discloses a kind of power system subsynchronous resonance energy recovery device and method, belong to power system technical field.The device includes band-pass filter unit, bypass switch unit, three-phase monitoring unit, control unit, three-phase thyristor full-bridge circuit and three-phase inductance energy storage module.Band-pass filter unit is connected in parallel at the unit outlet bus, bypass switch unit is connected in parallel at the filter unit two ends, realizes time-sharing switching;Control unit identifies resonance according to monitoring signal, controls thyristor full-bridge circuit and switches between rectification and inverter mode.The method is: standby bypass filtering, monitor power frequency;Resonance is over threshold, and filter is put in, and energy is stored by rectification;Resonance is eliminated, and energy is fed back to power grid by bypass filtering after inverter.The application realizes accurate detection, fast inhibition and energy lossless recycling and reuse of subsynchronous resonance by pre-filtering and bypass switch cooperation, greatly improves system economy and equipment reliability.

The invention relates to the technical field of power system operation, in particular to a battery energy storage additional damping control method and device and electronic device.The method comprises the steps that according to software and hardware platform resources and a program coding environment of an energy storage power station, battery energy storage additional damping control software of the energy storage power station is written, and a configuration file is generated according to the control software; calling a file to start a control interface, and determining and writing an operation model, modal parameters and function execution logic; and finally, burning the configuration file to the energy storage converter, calling software by the energy storage converter, and realizing additional damping control in combination with operation data of the power station. Therefore, the problems of poor suppression effect, high possibility of causing new resonance and the like in related technologies of thermal power subsynchronous resonance suppression are solved.