1376results about "Load balancing in dc network" patented technology

The invention discloses a DC bus voltage fluctuation suppression method of a renewable energy hydrogen production system, and relates to the technical field of renewable energy electrolysis hydrogen production. The method comprises the following steps: collecting system operation parameters in real time; bus voltage disturbance power is estimated based on a disturbance observer, and frequency decomposition is carried out; fusing the ARIMA model and the LSTM model to predict the load power, and calculating a prediction deviation; dynamically setting upper and lower limits of a bus voltage control interval according to the predicted deviation and the operation state; a multi-objective optimization function is constructed, bus voltage disturbance power, prediction deviation and a control limit value are comprehensively considered, and power regulation instructions of battery energy storage, a fuel cell and an electrolytic cell are solved; and executing power regulation control to realize bus voltage stabilization. The method can improve the grading response capability of voltage disturbance, the prediction accuracy of load power change, the adaptability of the control boundary and the overall operation stability of the system, and is suitable for the electric energy quality control of the hydrogen production system in a multi-source fluctuation scene.

The invention relates to the technical field of hydrogen production, in particular to a micro-grid hydrogen production system based on dynamic optimization control and a multi-mode energy scheduling method. Comprising a renewable energy power generation unit which comprises at least two distributed power supplies with different power generation characteristics; the multi-stage hydrogen production device is configured to receive the electric energy output of the renewable energy power generation unit and perform proton exchange membrane water electrolysis hydrogen production; the hybrid energy storage system comprises a super capacitor bank and a lithium ion battery pack which are connected in parallel to the direct current bus through a bidirectional DC / DC converter; the dynamic optimization controller is internally provided with a multi-time-scale coordination algorithm and is used for acquiring meteorological prediction data, load demand data and an energy storage SOC state in real time; the multi-mode scheduling module comprises three working modes including an island operation mode, a grid-connected operation mode and an emergency standby mode; according to the scheme, hydrogen production economy, equipment durability and power supply reliability can be considered at the same time.

The invention provides a self-adaptive constraint model active mismatch prediction control method based on voltage and current ripple resistance of a power converter in a hybrid energy storage system, and the method comprises the steps: building an island DC micro-grid system model, collecting the voltage and current information of a system, and designing a model prediction control frame of a power loop and a cost function of the model prediction control frame; designing a model predictive control framework of the current loop and a cost function of the model predictive control framework; designing an active model mismatch mechanism to enhance the response capability to dynamic change; determining an optimization problem with a normal value, and designing an adaptive constraint optimization algorithm to dynamically adjust constraint parameters and optimize control performance; and designing a steady-state and dynamic-mode trigger for adapting to the running state of the system. According to the invention, the trajectory tracking precision of the system under dynamic and steady-state working conditions can be significantly improved, current ripples caused by control delay can be effectively eliminated, damage to electrical equipment due to overlarge ripples can be avoided, and the service life of the equipment can be prolonged.

The invention discloses an alternating control method and system for the running state of a composite electrolytic cell cluster, and the method comprises the steps: firstly converting electric power into direct current through a converter by employing a photovoltaic power generation and wind power generation system, transmitting the direct current into a system direct current bus, and carrying out the hydrogen production according to the load range, starting time, hydrogen production efficiency and other running characteristics of an electrolytic cell during the hydrogen production of the electrolytic cell cluster; and dividing the hydrogen production power of the electrolytic cell into a plurality of operation state intervals. According to the input power level of wind and light power generation, the total power is divided into different working conditions in a stepped mode, the operation state of the electrolytic cell is dynamically adjusted according to the current power requirement, electric power in a direct-current bus is flexibly allocated to an electrolytic cell cluster through a DC / DC converter, and cooperative power distribution between a proton exchange membrane electrolytic cell and an alkaline electrolytic cell is ensured. Based on the difference between advantages and disadvantages, a matching mechanism of the operation state and different electrolytic bath types is planned, and the load of each electrolytic bath is balanced through state alternation, so that the dynamic operation stability of the whole system is enhanced and the hydrogen production efficiency is improved.

The invention relates to an optical storage and charging alternating current and direct current hybrid micro-grid construction control method and device and a medium. According to the method, level-to-level management is carried out on an energy storage converter according to an SOC value of an energy storage device. And the converter with the high priority is switched to a VSG mode, and whether the voltage and frequency fluctuation of the micro-grid exceeds an adjustment dead zone or not is detected. When the frequency fluctuation is exceeded, active power output is adjusted through a VSG mode; when the voltage fluctuation is exceeded, the reactive power output is adjusted. And the energy storage equipment is switched to the VSG mode step by step, and when the requirements cannot be met, the photovoltaic equipment and the electric automobile support power grid are put into use in sequence. Before the photovoltaic equipment is connected, the voltage of the photovoltaic equipment is synchronized to be consistent with that of the connected energy storage equipment, and the VSG mode is converted. And if further support is still needed, the electric vehicle is used for feeding by adjusting a charging pile control algorithm. And the voltage and the phase need to be synchronized before the electric vehicle is connected so as to cooperatively support the micro-grid. According to the method, the voltage and frequency stability of the micro-grid system is remarkably improved.

The invention relates to the technical field of power grid dispatching, and discloses an optical storage direct-current flexible micro-grid multi-target optimization dispatching system, which comprises a photovoltaic power generation module, an energy storage module, a direct-current power supply module, a flexible power supply module and a multi-target optimization dispatching module, and is characterized in that the multi-target optimization dispatching module comprises a monitoring unit used for monitoring each load unit in real time, acquiring basic power utilization information; the prediction unit is used for carrying out load prediction on the load unit at each moment every day according to the power utilization basic information; and the optimal scheduling unit is used for establishing a multi-target model by adopting a multi-target optimization algorithm and by taking the lowest daily operation cost and the maximum photovoltaic consumption rate of the optical storage direct-flexible micro-grid as targets, and solving the multi-target model based on a load prediction result to obtain an energy scheduling scheme of the optical storage direct-flexible micro-grid. According to the invention, the operation state of the micro-grid can be predicted and scheduled more accurately, so that an energy scheduling scheme with a better effect is obtained, and the energy utilization efficiency and the system operation stability are improved.

The invention discloses a hybrid hydrogen production system coupled with photovoltaic renewable energy and an optimal configuration method, and relates to the technical field of new energy utilization and energy storage control, and the hybrid hydrogen production system comprises a photovoltaic power generation unit, an alkaline water electrolytic tank unit, a proton exchange membrane electrolytic tank unit, a hydrogen storage unit, a control unit and the like. Photovoltaic electric energy is directly supplied to the two types of electrolytic cell stacks through the direct current bus, a traditional DC-DC power converter is omitted, and loss in the energy transmission process is reduced; and through a dynamic electrolytic cell switching algorithm configured by the control unit, the input proportion and the number of operation units of the two stacks are changed and adjusted in real time, and the quick response capability and the long-term stability are both considered. The system can stably produce hydrogen under the condition of renewable energy fluctuation, can dynamically adapt to input power change, can realize maximum power point tracking control on the premise of not using extra power conversion equipment, and remarkably reduces initial investment cost and operation energy consumption while ensuring hydrogen production efficiency.

The invention discloses a wind and light off-grid hydrogen production two-stage power optimization method considering reserved energy of energy storage, and belongs to the technical field of wind and light off-grid hydrogen production system power optimization, and the technical scheme is that the method comprises the following steps: S1, establishing a wind and light off-grid hydrogen production system mathematical model; s2, inputting minute-level wind and light historical data; s3, formulating a power distribution rule considering deep coupling of an electrolytic bath operation condition and energy storage preparation energy in a first operation stage, and determining hydrogen production power and hybrid energy storage initial distribution power; and S4, in the second operation stage, with the minimum unit hydrogen production cost and the minimum average charge and discharge depth of the storage battery as targets, the hybrid energy storage power is optimized by adopting an improved multi-target particle swarm algorithm. The method has the beneficial effects that the hydrogen production stability and the energy storage and power supply capacity can be improved, and the wind and light abandoning rate and the unit hydrogen production cost can be reduced.

The invention provides an AC / DC hybrid microgrid multi-target scheduling method and system based on digital twinning, and relates to the technical field of microgrid scheduling, and the method comprises the following steps: building an AC / DC hybrid microgrid digital twinning model, and dynamically integrating the related data of a power grid; establishing a comprehensive total cost model of the small AC / DC hybrid micro-grid system; according to the method, three power generation modes of photovoltaic power generation, photo-thermal power generation and wind power generation and an energy storage device are combined, and an equipment dynamic efficiency model is established based on the influence of factors such as a local load and an external large power grid environment on the efficiency of AC / DC hybrid micro-grid equipment; various twin data such as a local load and an external large power grid environment are obtained through a digital twin model, a multi-target particle swarm algorithm based on an improved archive maintenance strategy and a fuzzy decision method is proposed with economic benefits and the health degree of the energy storage device as targets, the output condition of the energy storage device is dispatched and optimized in real time, and the output efficiency of the energy storage device is improved. And the multi-energy complementation and conversion capability of the system is improved.

The invention discloses a hybrid energy storage device control method, equipment and a medium, relates to the technical field of hybrid energy storage system control, and provides a hybrid energy storage device control method for solving the problem that a current lithium battery and a super capacitor are difficult to use in a hybrid manner, and the direct current bus voltage of a hybrid energy storage device is stabilized by using the super capacitor. Based on electrical characteristics, it can be known that the direct-current bus voltage is stable and does not have an over-high peak value. Furthermore, under the condition that the current is constant, the output power does not have an over-high peak value, so that the problem that the lithium battery is not suitable for a high-power scene is solved. Furthermore, in the method, the super-capacitor is only responsible for balancing the voltage of the direct-current bus, and the discharging time is short, so that the problem that the super-capacitor is not suitable for a high-capacity scene can be solved. Therefore, according to the method, the application scene problems of the lithium battery and the super capacitor are solved respectively, and preconditions and an effective control scheme are provided for implementation of the lithium battery-super capacitor hybrid energy storage device.

The invention discloses a micro-grid system based on a direct current bus and a control method, the micro-grid system comprises the direct current bus, an energy management unit and a plurality of power conversion modules, when the micro-grid system is in an independent adjusting mode, each power conversion module controls the direct current bus to operate according to bus operation parameters of the direct current bus; and when the micro-grid system is in a centralized regulation mode, the energy management unit issues a control instruction to coordinate the output power and / or the input power of each power conversion module. According to the technical scheme, a unified direct current bus framework is constructed, the photovoltaic energy unit, the energy storage energy unit, the commercial power energy unit, the direct current load and other loads are directly connected to the direct current bus, direct current direct supply and direct current direct charging are achieved, the energy link structure is simplified, the power conversion link is reduced, the overall energy efficiency of the system is improved, and the system cost is reduced. And the phenomena of multiple energy conversion and energy loss caused by dependence on an alternating current bus in the prior art are avoided.

A multi-drop, packet energy transfer (PET) receiver configured to be electrically connected to a PET transmission line and an electric load comprising receiver front-end circuitry including an input configured to be electrically connected to the PET transmission line, an output; and at least one switch or at least one diode connected at the output. There is a receiver output control and conditioning circuity with an input connected to the switch / diode, an output to be connected to the electrical load. There is a bootstrap capacitor connected across the input, and a bulk capacitor connected across the output and across the electric load. There is a load controller configured to operate the switch / diode to allow power to flow into the receiver output control and conditioning circuitry during transfer periods and to prevent power to flow into the receiver output circuitry during sample periods.

A locomotive comprises a DC power bus, traction motors, batteries, and a charging source, but has no prime mover engine. Each traction motor includes armature and field windings connected in parallel across the DC power bus. The batteries provide power to the DC power bus when in a motoring mode, and receive power from the DC power bus when in a charging mode and a dynamic braking mode. The charging source is connected across the DC power bus to provide charging power to the batteries when in the charging mode. The traction motors also provide charging power to the batteries when in the dynamic braking mode. The power from the charging source is less than the power that would be provided by a prime mover engine. The charging source provides no power to the traction motors when in the charging mode.

The invention provides a control method and device for a photovoltaic hybrid energy storage system, and belongs to the field of power systems. The method comprises the following steps: respectively obtaining a frequency variation and a frequency change rate of an alternating current side of the photovoltaic hybrid energy storage system; determining an expected battery power variation of the energy storage battery unit based on the frequency variation and the dynamic inertia coefficient, and controlling the energy storage battery unit to operate according to the expected battery power variation, so that the energy storage battery unit absorbs a low-frequency power variation caused by the frequency variation; the value of the dynamic inertia coefficient is determined by the frequency change rate and the frequency change quantity; and based on the frequency change rate, determining an expected capacitance power variable quantity of the super-capacitor unit, and controlling the super-capacitor unit to operate according to the expected capacitance power variable quantity, so that the super-capacitor unit consumes a high-frequency power variable quantity caused by the frequency change rate. The stability of the power grid system can be effectively guaranteed.

The invention relates to the technical field of hybrid energy storage control strategies, and discloses a hybrid energy storage progressive model prediction control method based on optimal duty ratio tracking. The method comprises the following steps: setting a front-end MPC and a rear-end MPC which are used for controlling the on-off of a switching tube in a system, selecting an optimal duty ratio output corresponding to the minimum cost function of the front-end MPC, driving the on-off of the corresponding switching tube to stabilize the bus voltage, calculating the real-time optimal reference power of hybrid energy storage at the next moment, and taking the real-time optimal reference power as the real-time optimal reference value of the rear-end MPC after passing through a high-pass filter; and selecting the corresponding optimal switching state output when the cost function of the rear-end MPC is minimum, and driving a corresponding switching tube to be switched on and switched off, so that the output power of the super capacitor tracks a real-time optimal reference value given by the front-end MPC in real time, the power fluctuation is stabilized, and the bus voltage is further stabilized. According to the invention, the fluctuation of the bus voltage is smaller under the fluctuation of the load power; and optimal reference power transmission under model prediction control is considered, so that the control performance is optimized.

The invention discloses a dynamic power distribution method and device for a direct-current micro-grid hybrid energy storage system, and relates to the technical field of electric energy storage management, and the method comprises the steps: collecting the power parameters, load demand fluctuation data and renewable energy power generation output data of each energy storage unit in the hybrid energy storage system in real time, calculating a multi-dimensional power entropy index, and calculating the power entropy index of the hybrid energy storage system; based on the indexes, power distribution weight coefficients are dynamically generated, power dynamic distribution is carried out, a charging and discharging strategy is generated, charging and discharging control of the hybrid energy storage system is executed, and power distribution is dynamically adjusted in combination with a real-time feedback mechanism. The technical problems that an existing energy storage system power distribution method lacks flexibility and cannot effectively cope with load fluctuation and unstable renewable energy sources, so that the system operation efficiency and stability are poor are solved, the charging and discharging strategy of the energy storage unit is dynamically adjusted through the multi-dimensional power entropy index and the real-time feedback mechanism, and the energy storage efficiency is improved. The technical effect of efficient and stable operation of the energy storage system is achieved.

The invention discloses a self-adaptive virtual inertia control and power distribution method of an energy storage converter suitable for a multi-direct-current micro-grid. The method comprises the following steps: establishing a virtual direct-current motor control model; based on the virtual direct current motor control model, designing an adaptive virtual inertial parameter control and power distribution algorithm, so that the energy storage converter can simulate the inertia and damping characteristics of the direct current generator; constructing a small-signal model of the common DC bus of the multi-DC micro-grid, analyzing the influence of inertia and damping parameters on the dynamic performance and stability of the system, and drawing a Nyquist curve based on an impedance ratio criterion to optimize the inertia and damping parameters; and verifying the adaptability of the adaptive virtual inertial parameter control and power distribution algorithm in the multi-direct-current micro-grid, and realizing effective control on the bus voltage stability and the power distribution of the energy storage unit by adjusting the power response characteristic of the energy storage unit. According to the invention, the stability and response speed of the multi-direct-current micro-grid system are improved, the bus voltage fluctuation is effectively slowed down, and the service life of the energy storage unit is prolonged.

The present invention provides a DC microgrid system for a well group of pumping units and a coordinated control method thereof, and belongs to the technical field of DC microgrid systems. The technical scheme is as follows: the high voltage side of the step-down transformer is connected to the three-phase power grid, the low voltage side of the step-down transformer is connected to the AC input end of the AC / DC converter one, the DC output end of the AC / DC converter one is used as a common DC bus, the output end of the photovoltaic panel is connected to the low voltage input end of the unidirectional DC / DC converter, the high voltage output end of the unidirectional DC / DC converter is connected in parallel to the common DC bus, the stator output end of the permanent magnet wind turbine generator set is connected to the AC input end of the AC / DC converter two, the DC output end of the AC / DC converter two is connected in parallel to the common DC bus, and the pumping unit and the DC / AC converter three are respectively connected in parallel to the common DC bus. The beneficial effects of the present invention are: it can effectively reduce the voltage fluctuation of the DC bus and improve the stability of the power supply system.

The invention discloses an electricity-hydrogen hybrid energy storage direct-current micro-grid coordination control method based on bus voltage layering. The method comprises the following steps that 1, a mathematical model of an electricity-hydrogen hybrid energy storage direct-current micro-grid system is built, and a wind power generation system model, an electrochemical energy storage system model and a hydrogen energy storage system model are built; 2, dividing operation conditions for the system based on the bus voltage fluctuation range; 3, droop control and constant pressure control based on a fuzzy algorithm are adopted by the hydrogen energy storage system; 4, the electrochemical energy storage system adopts similar virtual synchronous machine control and constant voltage value control; according to the electricity-hydrogen hybrid energy storage direct-current micro-grid coordination control method based on bus voltage layering, the bus voltage of the direct-current micro-grid is kept stable under the source load fluctuation condition, good dynamic performance is achieved, and the problem of over-charging and over-discharging of a hydrogen energy storage system is effectively solved.

The invention discloses a vehicle integrated domain controller framework, a vehicle management system and an automobile, the vehicle integrated domain controller framework comprises a low-voltage battery, a battery management module, a low-voltage power distribution module and a heat management module, the low-voltage battery is electrically connected with the low-voltage power distribution module, and the battery management module is electrically connected with the low-voltage power distribution module. The low-voltage power distribution module is provided with a low-voltage load access end used for accessing a low-voltage load, the thermal management module is provided with a thermal management load access end used for accessing a thermal management load, and the battery management module, the low-voltage power distribution module and the thermal management module share the same controller. A function of managing a low-voltage battery and a function of managing a thermal management load and a low-voltage load are integrated in the controller, control modules in a battery management scheme, a low-voltage power distribution scheme and a thermal management scheme are creatively integrated into the same controller, a control circuit is simplified, and the controller has the advantages of being low in cost, simple in structure and the like.

The invention provides a photovoltaic-based multi-load hybrid energy storage system. The photovoltaic-based multi-load hybrid energy storage system comprises a photovoltaic array, a capacitor C1, a capacitor C2, a capacitor C6, a first DC-DC converter, a second DC-DC converter, a third DC-DC converter, a fourth DC-DC converter, a DC bus, a supercapacitor bank, a storage battery pack, a first DC-AC converter, a second DC-AC converter, a filter LCL, a DC load and an AC load. The first DC-DC converter connected with the photovoltaic array is controlled by adopting an MPPT control method based on a conductance increment method, the second DC-DC converter and the third DC-DC converter which are connected with the super capacitor bank and the storage battery pack adopt a control method of voltage outer loop and current inner loop, and the first DC-AC converter connected with the power grid adopts three-phase current decoupling control. The control method of the fourth DC-DC converter connected with the direct-current load and the second DC-AC converter connected with the alternating-current load can be changed according to load requirements, the advantages can be reasonably exerted according to different application scenes, and the clean energy, namely light energy, can be better utilized.

The invention relates to the technical field of ship electric energy storage, and discloses a ship distributed electric energy storage and distribution balance control system which comprises a plurality of distributed storage units, a direct current bus, a plurality of power conversion modules and a dynamic balance control module. The dynamic balance control module is used for collecting the voltage deviation value of the direct current bus and the current response rate and the charge state parameter of each storage unit and determining a transient charge deviation compensation value, and the system determines the transient power flux of each node according to the current response rate and the charge state parameter. And dynamic linear calibration of feedback gain is realized based on the charge deviation compensation value so as to adjust the power output flow rate of each storage unit, the charge throughput of the direct current bus is balanced through real-time hedging of the surplus or deficient state of the transient charge of the bus, voltage oscillation during ship propulsion load switching is effectively inhibited, and the reliability of the ship propulsion load switching is improved. And the transient stability of the bus voltage is maintained.

The modular system for hydrogen generation includes a plurality of cores and a hub. Each core includes an electrolyzer and a power supply. The power supply is operable to manage power to the core's electrolyzer and is redundant to the power supply of at least one other of the plurality of cores. The hub includes a water module, a heat exchange module, and a switchgear module. The water module includes a water source in fluid communication with the electrolyzer of each of the plurality of cores, the heat exchange module includes a heat exchanger in thermal communication with the electrolyzer of each of the plurality of cores, and the switchgear module includes a switch activatable to electrically isolate the power supply of each of the plurality of cores.

The invention discloses an AC-DC hybrid microgrid power control method and system, and the method comprises the steps: measuring the operation state quantity of a system at the kth sampling moment of a current control period, and building an AC-side mathematical model of an interconnection converter according to the operation state quantity; according to the operation state quantity of the interconnected converter, judging the power transmission direction of the interconnected converter; a power prediction model is established, and active power and reactive power prediction values at the k + 1 moment are solved in combination with different switching states; calculating a power reference trajectory, and calculating a cost function value corresponding to each switching state by combining the predicted values of the active power and the reactive power; obtaining cost function values under all switching states, selecting the switching state corresponding to the minimum cost function value, and applying the switching state to the bridge arm switching control of the interconnected converter; and entering a next control period, and repeating the steps. According to the invention, bidirectional power mutual assistance between AC and DC hybrid power grids can be realized in multiple scenes of the flexible interconnection hybrid power grid, and the voltage stability is improved.

The invention discloses a stability margin optimization method and system based on a grouping delivery channel of a direct-current power transmission line, and relates to the technical field of direct-current power transmission and stability judgment. Comprising the steps of collecting outgoing power data of each group of direct-current transmission lines; establishing a time sequence for the collected outgoing power data and carrying out normalization processing; establishing a prediction model and calculating a stability margin index of the delivery channel; and the transmission power is dynamically adjusted based on the stability margin index predicted value, and the stability of the transmission line is optimized. According to the invention, by establishing the outgoing power time sequence and carrying out normalization processing, standardized analysis of various types of generated power data is realized; by establishing a prediction model and introducing influence factors, the stability margin index of the direct-current transmission line at the next moment is accurately predicted, and potential stability risks are identified in advance; a dynamic adjustment strategy is implemented based on a stability margin index prediction value, reasonable power distribution is performed among power transmission lines with different stability margins, and the power transmission fault risk is reduced.

To provide a modular system for appropriately generating hydrogen, and a method of operating the same.SOLUTION: A modular system for hydrogen generation includes a plurality of cores and a hub. Each core includes an electrolyzer and a power feeder. The power feeder is operable to manage the electric power to the electrolyzer of the core and is redundant to the power feeder of at least the other one of the plurality of cores. The hub includes a water module, a heat exchange module, and a switchgear module. The water module includes a water source in fluid communication with the electrolyzer of each one of the plurality of cores, the heat exchange module includes a heat exchanger in thermal communication with the electrolyzer of each one of the plurality of cores, and the switchgear module includes a switch activatable to electrically isolate the power feeder of each one of the plurality of cores.SELECTED DRAWING: Figure 1A

An electrolyser plant (1A) is described. The electrolyser plant (1A) includes a first DC link (8) with at least one DC link capacitor (C1) and an AC / DC power converter (6). An electrolyser (10) is electrically connected to the first DC link (8) and adapted to receive a load current. During normal operation of the AC power network (2), a controller (12) is adapted to maintain a pre-event DC link voltage and supply a pre-event load current to the electrolyser (10). In response to a detected low voltage event, the controller (12) is adapted to: (a) initially supply the pre-event load current to the electrolyser (10) to maintain normal operation of the electrolyser (10), (b) monitor the DC link voltage, e.g., the voltage in the first DC link (8), and (c) if the monitored DC link voltage falls below a first voltage threshold that is less than the pre-event DC link voltage, reduce the load current supplied to the electrolyser (10), optionally by ramping down the load current at a suitable ramp rate.

The invention discloses an energy equipment control method and system based on a multi-terminal energy router and a medium, and relates to the field of expressways, and the method comprises the steps: collecting the real-time operation data, monitored by the multi-terminal energy router, of multi-terminal energy equipment along the expressway; based on the real-time operation data, constructing an energy network model of multi-terminal energy equipment along the highway; based on the energy network model, analyzing a supply-demand relationship of multi-terminal energy equipment along the highway, and determining an energy scheduling scheme; and based on the energy scheduling scheme, the multi-terminal energy equipment is scheduled through the multi-terminal energy router, and the energy scheduling scheme is dynamically adjusted according to the real-time monitoring result so as to optimize the transmission path and the flow direction of the energy in different scenes. The method can adapt to the dynamic change of the energy demand along the expressway, achieves the optimal scheduling and effective management of the multi-terminal energy equipment, and improves the energy utilization rate.

The invention provides a voltage fluctuation suppression method and device for a subway direct-current power supply system, and the method comprises the steps: obtaining the voltage amplitude change information of the subway direct-current power supply system at different sampling moments, and determining a real-time voltage fluctuation sequence and the operation state characteristics of each power supply node according to the voltage amplitude change information; space-time correlation mapping processing is carried out on the real-time voltage fluctuation sequence and the operation state features, a fluctuation correlation feature set is generated, and the fluctuation correlation feature set comprises voltage fluctuation space-time propagation path features and inter-node coupling influence features; calling a pre-trained fluctuation suppression decision model to perform dynamic suppression strategy generation processing on the fluctuation association feature set to obtain a voltage regulation parameter sequence for each power supply node; according to the voltage regulation parameter sequence and the operation state characteristics of the power supply nodes, generating a node-coordinated fluctuation suppression execution instruction set; and according to the fluctuation suppression execution instruction set, triggering voltage regulation operation of each power supply node to suppress voltage fluctuation.

A power management system for an elevator system. A power management system for an elevator system includes a power converter having three input terminals, two of the three input terminals coupled to a main power source for supplying single-phase AC power to the power management system, the power converter configured to convert the AC power from the main power source into DC power on a common DC bus, a secondary power source for supplying DC power to the common DC bus, a power inverter configured to invert the DC power on the common DC bus into AC output power for driving an electric motor of the elevator system, and a dynamic braking resistor which is coupled between a third input terminal among the three input terminals of the three-phase power converter and the common DC bus.