51results about How to "Improve voltage quality" patented technology

The invention relates to the technical field of wind and light energy storage, in particular to a wind and light energy storage optimization method and system for a low-carbon economic park. Comprising the steps that a plurality of energy storage sub-regions are established based on park parameters, an energy storage sub-region sequence A is generated, A = (a1, a2... an), and ai is the ith energy storage sub-region; n is the number of the energy storage sub-regions; establishing an energy storage collaborative model, and setting energy storage equipment parameters in each energy storage sub-region; according to a preset feedback time node, obtaining operation parameters of each energy storage sub-region, and judging whether a correction instruction is generated or not; according to the park parameters, a plurality of energy storage sub-regions are established, and corresponding energy storage modules are established for each energy storage sub-region, so that regional adjustment is carried out on the interior of the park, the normal power supply demand of the interior of the park in the valley period of wind and light power generation is ensured, and the peak clipping and valley filling optimization scheduling efficiency of a power system is improved. And the overall operation and maintenance cost of the energy storage system is reduced.

The invention discloses a converter parallel operation virtual impedance angle self-adaptive control method and system, and relates to the technical field of converter system control, and the method comprises the steps: observing an active mean value and a reactive mean value through a consistency control algorithm; obtaining a trigonometric function value corresponding to the virtual impedance angle through the active mean value and the reactive mean value; obtaining virtual resistance and virtual negative reactance corresponding to each converter; performing power coordinate conversion on active power and reactive power of the converter by using the dynamically changed virtual impedance angle to obtain generalized active power and generalized reactive power; and generalized active power and generalized reactive power are controlled. The method is suitable for occasions where multiple converters operate in parallel, such as a micro-grid, the problem of voltage deviation after virtual impedance is introduced can be remarkably solved by dynamically adjusting the virtual impedance angle in real time, and the voltage quality is improved.

The invention discloses a multi-agent-based control method and system for an improved consistency algorithm. The method comprises the following steps: building a coordinated voltage control model of a light-hydrogen-storage system consisting of a distributed photovoltaic system and a hydrogen energy storage system; in the photovoltaic power generation process, an inverter is responsible for stably transmitting reactive power to a power network, a certain adjusting capacity is reserved, and the voltage of a photovoltaic grid-connected point is adjusted and controlled by absorbing or releasing reactive electric energy; the hydrogen energy storage system monitors the voltage change condition by using the peak clipping and valley filling characteristics of the hydrogen energy storage system, plays a role in smoothing the influence brought by photovoltaic power generation fluctuation in a certain interval range, and optimizes an electrolytic cell; the principle of a consistency algorithm is analyzed, a typical finite time consistency algorithm is improved, and control gains c1 and c2 are introduced, so that the multi-agent system achieves average consistency within limited time; according to the invention, the control time of the photovoltaic inverter and the hydrogen energy storage system is reduced, and the reliability of a multi-agent coordinated voltage control strategy is improved.

The invention discloses a distributed adaptive fault-tolerant control method for a direct-current micro-grid, and the method comprises the steps: designing a distributed adaptive fault compensator based on an extended state observer, and enabling the distributed adaptive fault compensator to be used for compensating the control input of each distributed power supply under the conditions of actuator failure, bias fault and external interference; based on a distributed consistency protocol and a self-adaptive fault compensator, a distributed secondary comprehensive performance optimization adjustment mechanism is provided, and the fault-tolerant capability, the voltage quality and the current sharing precision of the direct-current micro-grid system under the actuator fault are improved; and a Lyapunov stability proof of system convergence based on a distributed adaptive fault-tolerant control method is given. According to the method, multiple types of actuator faults are considered, so that the method is more general; upper bound or lower bound information of any fault is not needed, the difficulty of parameter configuration of the controller can be effectively reduced, and the method is more universal and practical; the distributed power supply is completely distributed, no global information is needed, only the information of the local and adjacent distributed power supplies is utilized, and the communication cost is reduced.

The invention discloses a new energy comprehensive control method and device, electronic equipment and a storage medium, and relates to the technical field of photovoltaic power generation, and the main technical scheme comprises the following steps: respectively obtaining first real-time system data and historical system data of a preset duration; generating a regulation and control instruction according to the real-time system data and the historical system data; and performing regulation and control according to the regulation and control instruction. Compared with the prior art, according to the embodiment of the invention, the regulation and control instruction is generated through the first real-time system data and the historical system data, devices in the system are uniformly coordinated and controlled, the voltage of the grid-connected point meets the design requirement, finally, automatic regulation and control of the voltage of the grid-connected point and the reactive power are achieved, reactive power distribution is reasonably coordinated and optimized, and the system reliability is improved. Safe and stable operation of a power grid is ensured, voltage quality is improved and active loss is reduced.

The invention discloses a method for designing parameters of a main loop of a transformerless multi-terminal flexible interconnection device, and relates to the technical field of alternating-current power grid power flow control and power electronics, and the method comprises the steps: carrying out MTSNOP main loop parameter design through series converter design and parallel converter design; the design of the series converter comprises the design of the voltage, the number and the capacitance value of PFCM and PBCM submodules, the design of bridge arm inductors of the PFCM and the PBCM and the design of alternating current side equivalent filter inductors; the parallel converter design comprises parallel CMI capacity design, sub-module voltage and number design, parallel CMI sub-module capacitance value design and parallel CMI connection inductor design. According to the method, a modular design is adopted, ports are easy to expand, and the method can adapt to power systems of different scales; the reasonable parameter design can effectively improve the system transmission capacity, alleviate the line heavy load problem, optimize the transmission power flow, effectively inhibit the voltage fluctuation, and improve the voltage quality.

The invention relates to an electric vehicle charging pile reactive power regulation method and system based on cloud processing. The method comprises the steps that real-time electric quantity and operation state data are collected through an intelligent electric meter and a charging pile; utilizing historical data and a machine learning algorithm to predict a reactive power regulation range meeting voltage safety constraints; based on the target power factor or the power grid adjustment instruction, establishing a reactive power optimization model, and calculating a reactive power distribution scheme of the charging pile; and issuing the optimization instruction to each charging pile for execution, and dynamically adjusting the strategy. The system comprises a data acquisition unit, a communication unit, a cloud processing unit, an instruction issuing unit and a user interface unit, and centralized management and optimization of reactive power regulation of the charging pile are realized. Compared with a traditional mode, the bidirectional reactive power regulation capability of the charging pile is fully utilized, the equipment investment is reduced, the energy efficiency is improved, high efficiency and flexibility are achieved, the requirement of a future power grid for reactive power regulation is met, and the wide application prospect is achieved.

The invention relates to a three-phase imbalance treatment rapid phase-change switch device, which comprises a main controller, a plurality of intelligent phase-change switch boxes and a main station, and is characterized in that each intelligent phase-change switch box comprises a control platform used for realizing comprehensive analysis of acquired data and sending out optimal phase-change operation and a phase-change switch used for realizing current data acquisition and phase-change operation; the phase-change switch is a solid-state intelligent phase-change switch and comprises a three-phase solid-state switch, a current sensor, a DSP controller, a driving protection device and a communication device. The method has the advantages of improving the voltage quality, stabilizing the system voltage, reducing the line loss and solving the problem of overload operation of the transformer.

The invention discloses a multi-standard power supply system and method for a locomotive test, and relates to the technical field of test power supplies, and the structural design of the system is as follows: an input power supply is a three-phase alternating current 10kV power supply; the high-voltage switch K realizes access control and isolation of the system and a public power grid, the connection reactor L realizes energy buffering and inhibits switch ripples in output current, and the soft charging circuit pre-charges the three-stage converter. The three-level converter converts three-phase alternating current 10kV into DC1500 / 750V and outputs the DC1500 / 750V to the direct-current bus, one path of the direct-current bus supplies power to a subway vehicle test line, and the other path of the direct-current bus is inverted into single-phase alternating current 25kV through the output inverter and supplies power to a railway locomotive test line. According to the invention, alternating current test conditions of railway electric traction locomotive vehicles and direct current test conditions of subway vehicles can be satisfied, reliability and quality of power supply are ensured, repeated construction is reduced, and resource waste is avoided.

The invention discloses a fault reconstruction method of a digital micro-grid, and particularly relates to a fault reconstruction method of a digital micro-grid considering uncertain renewable energy power generation and a demand side resource aggregator. According to the method, a load aggregator demand response model based on a price elastic coefficient is established, and the uncertainty of renewable energy power generation accessed into the novel power distribution network is effectively described through chance constraint. In addition, a power flow model suitable for novel power distribution network reconstruction is established, and then a new energy power distribution system reconstruction model is established by considering network loss and switching cost. Aiming at the non-convexity of the reconstruction model, a large M method and second-order cone relaxation are adopted, and an intermediate variable is introduced to convert the reconstruction model into a mixed integer second-order cone programming problem. According to the method, through simulation experiment analysis, detailed verification results are given, and the reliability and effectiveness of the method in the aspect of fault reconstruction of the new energy power distribution system with demand side resources and uncertain renewable energy power generation are explained.

The invention discloses a power distribution network restoring force improving method and system based on energy storage output cooperative scheduling. The method comprises the steps that whether energy storage capacity decline early warning is triggered or not is judged according to the current energy storage capacity; judging whether energy storage capacity insufficiency early warning is triggered or not according to the obtained power change prediction curve; performing dynamic planning at least based on the current energy storage capacity and the power change prediction curve to obtain a short-term energy storage scheduling strategy; performing load flow calculation on the operation state data of the power distribution network based on a short-term energy storage scheduling strategy to obtain a node voltage distribution result of the power distribution network, and obtaining an energy storage voltage regulation effective capacity according to the node voltage distribution result of the power distribution network; performing power vacancy calculation on the reactive power compensation device operation strategy to obtain a reactive power compensation loop power vacancy value; and when the power distribution network is not in the power balance state, executing a load removal instruction to improve the restoring force of the power distribution network. The method can effectively improve the recovery capability of the power distribution network in an extremely low temperature environment.

The invention discloses an operation state regulation and optimization method for a power distribution network containing a distributed power supply and a flexible load, and the method comprises the following steps: obtaining a topological structure and operation parameters of the power distribution network, and constructing a power distribution network operation state regulation model according to the topological structure and the operation parameters; on the basis of a power distribution network operation state regulation and control model, a traditional knowledge acquisition sharing algorithm is improved, and a spiral updating strategy is introduced to guide a search individual to approach a current candidate optimal solution along a spiral trajectory; and performing iterative solution on the operation state regulation and control model by using an improved knowledge acquisition sharing algorithm to obtain operation optimization configuration of the power distribution network. According to the method, the global search capability and the local convergence precision of the algorithm are remarkably improved, so that the operation optimization configuration can be quickly and accurately obtained, and the stability, the adaptability and the overall operation performance of the power distribution network when the power distribution network deals with renewable energy output fluctuation and load change are enhanced.

The invention relates to the technical field of power loss compensation, in particular to an intelligent control compensation system for container energy storage based on power loss, which comprises an energy storage container and comprises a monitoring module; a data analysis module; a compensation module; the control module is used for judging the discharge loss of the energy storage container according to the battery temperature in the energy storage container, and determining a loss processing mode according to the judgment result of the discharge loss, including adjusting the heat dissipation power of the heat dissipation unit, or adjusting the switching times of the switching unit according to the sudden change of the current at the load end, or determining the loss processing mode according to the judgment result of the discharge loss. Adjusting the update scene superposition number of the compensation analysis model according to the difference quantity of the compensation results of the same scene at different times; and adjusting the power-on delay duration of the switching unit according to the voltage variation of the switching unit under a preset condition. The energy storage discharge power consumption and the load circuit power loss degree are reduced, and the stability of the compensation process is improved.

The invention discloses a load side energy storage cooperative voltage control model and strategy, which takes a PQ node model as an equivalent model of an energy storage access power distribution network system, analyzes an energy storage droop control strategy, controls an output link of energy storage and further controls output power during energy storage grid connection so as to achieve a control effect of system voltage quality. Comprising a PQ control strategy and a droop control strategy, the PQ control strategy achieves voltage control through adjustment of active power and reactive power, and the droop control strategy simulates the similar frequency of a traditional generator and the relation between the active power amplitude and the reactive power and the relation between the voltage amplitude and the reactive power. Stable frequency and voltage output are obtained through P-f droop control and Q-V droop control respectively, and active power and reactive power output by a distributed power supply in the system are controlled respectively. The method has the advantages of being simple, reliable, adjustable and controllable in voltage and good in voltage control quality.

The present application relates to the technical field of power distribution network planning, and more particularly to a power distribution network multi-resource integrated planning method and system based on a graph neural network. The method comprises the following steps: collecting the operation and geographic data of the distribution transformers, feeder switches, 10kV feeders and each load access point in the target planning area to form a basic planning data set; constructing a power distribution network topology graph and using a graph neural network to identify overloaded feeder sections, low-voltage end sections and overloaded transformer nodes; then, according to the spatial position and power supply correlation of each problem area, determining the distribution transformer capacity expansion layout, tie switch addition and line extension reconstruction path; and finally, optimizing and outputting the target area planning scheme through power flow checking. The present application identifies the weak links of the power distribution network through a graph neural network and cooperatively optimizes the capacity expansion layout, tie transfer and line extension path, thereby achieving the precision, collaboration and economy of power distribution network planning and significantly improving the power supply capacity and overall operation reliability.

The invention discloses a hybrid excitation synchronous generator excitation control system and a joint simulation method, and the system comprises an excitation power conversion unit and an excitation control unit, and the excitation power conversion unit integrates the functions of an APFC circuit and a half-bridge LLC resonant converter. Comprising a power supply input conversion unit, a boost input inductor L1, a first switch tube Q1, a second switch tube Q2, a capacitor C1, a resonant inductor L2, a resonant capacitor C2, an inductor L3, a transformer primary side excitation inductor Lm, a first diode VD1, a second diode VD2, a third diode VD3, a fourth diode VD4, a filter capacitor C3 and a load resistor R0. The excitation control unit comprises a modal distribution unit and a PWM signal generator. According to the invention, the terminal voltage of the harmonic brushless hybrid excitation synchronous generator and the third harmonic output current are used as feedback signals of the outer ring and the inner ring, the stability of the terminal voltage of the generator under different loads is improved by adjusting the induction current in the stator third harmonic winding, and the voltage quality of a power grid is improved.

The invention relates to the technical field of power grid dispatching, in particular to an active-reactive collaborative optimization dispatching method for a power distribution network. Acquiring voltage, active power and power grid line data at the uploading moment of the user side and various monitoring data of the transformer substation in a preset time period; because the user side data and the transformer substation side data are in space-time asymmetry and have measurement blind areas, various data numerical value characteristics are fused and analyzed and compared with the user side voltage, a voltage-power transmission coefficient is determined, an accurate voltage prediction model is constructed, and the voltage prediction value of the user side at each preset moment is obtained; as the time goes on or the photovoltaic fluctuates greatly, the error increases, so that the active power change in the preset time period and the active power difference of the user side at the to-be-measured moment are corrected based on the difference characteristics of the transformer station monitoring data, and the corrected available capacity of the inverter is obtained; and determining an adjustment burden index by combining the voltage predicted value, and finally adjusting the transformer according to an index accumulation condition and the voltage predicted value.

The application discloses a kind of low-voltage distribution network governance device and method without CT voltage tracking, including three-phase four-wire transformer, the three-phase power line of pure three-phase load (1) is connected with the three-phase line of transformer corresponding, power quality management equipment (2) is accessed to the three-phase four-wire circuit of transformer, for balancing the voltage of three-phase line;Resistance component is accessed to the three-phase four-wire of transformer, in the front end of power quality management equipment (2), for adjusting the current and voltage in three-phase circuit, the application solves the comprehensive treatment of reactive power compensation, three-phase imbalance and end low voltage, overvoltage of distribution network in the case of canceling CT, ensure the efficient and economic operation of distribution network line, improve voltage quality;While reducing secondary accidents caused by equipment power quality management equipment itself failure, with reliable, convenient, safe and cost-reducing technical effect.

The invention relates to a locking method of a centralized control right in an AVC control strategy, and the method comprises the following steps: 1, collecting switch remote control information of a whole station, and setting locking attributes of different priorities in attributes of a remote control information table; step 2, based on the locking attributes of different priority levels set in the step 1, when the full-station centralized control right locking criterion receives a city dispatching remote control instruction, the first-level remote control participation attribute performs full-station centralized control locking determination verification; step 3, receiving the remote control instruction sent by the step 2, and carrying out second-level AVC control attribute locking judgment verification; and step 4, receiving the remote control instruction sent by the step 3, and carrying out locking judgment verification on the third-level unit equipment. According to the invention, the centralized control right locking AVC method with three layers of priorities is introduced, so that the centralized control right locking AVC system of the whole substation is not locked.

The invention relates to the technical field of power distribution management, in particular to a three-phase imbalance flexible control method for a low-voltage power distribution network. Comprising the following steps: firstly, establishing voltage-active and voltage-reactive quantitative relation models; and establishing a low-voltage power distribution network multi-objective optimization operation model and a resource cooperative scheduling method. The flexible management and control technology designed by the invention can reduce asymmetry, improve the stability and reliability of power grid operation and effectively improve the three-phase asymmetry of the system by adjusting and optimizing the wind and light storage operation power in real time; by formulating an optimal coordinated operation model, the operation power of distributed resources can be optimized on the premise of meeting three-phase balance constraints, and a three-phase imbalance control target is achieved with the minimum cost; the voltage is also used as a constraint condition for calculation, so that the voltage of each node of the low-voltage power distribution network is not out of limit, the voltage is ensured to be qualified, the voltage deviation and the possible power utilization safety risk of a user are reduced, and the voltage quality is improved.

The invention discloses a micro-grid oscillation suppression control method and system based on a self-adaptive static-dynamic model. The method comprises the following steps: predicting a direct-current side capacitor voltage value, an alternating-current side three-phase capacitor voltage value and an alternating-current side three-phase inductance current value at a next moment according to a value acquired at a current moment and obtained by sampling; taking the direct current side capacitor voltage value, the alternating current side three-phase capacitor voltage value and the alternating current side three-phase inductance current value obtained through prediction as well as the deviation of the expected values as control targets, and establishing a control target function in combination with each control target weight obtained through calculation according to an adaptive weight function; and modulating a voltage vector output by the control objective function by adopting a zero voltage vector injection modulation method to realize fixed frequency control. According to the application, a direct current side control target is added on the basis of model prediction control, an adaptive target function is adopted, the target function is evaluated to obtain an optimal voltage vector, and then a corresponding switching tube state is obtained by applying space vector pulse width modulation.

The present invention relates to a fast-charging load charging guidance method based on an adjustable hierarchical charging service fee, comprising: step S1, according to the regional road network and distribution network constraints, a fast-charging load prediction model based on the travel chain and the Monte Carlo method is established to predict the changes in the user's travel time and space trajectory and the fast-charging demand; step S2, a user charging position weighted decision model is established to make charging position decisions, and the fast-charging load of each charging station is counted; step S3, a regional hierarchical charging service fee adjustment model is constructed with the optimization goal of minimizing the absolute value of the sum of the voltage deviations of the distribution network nodes in the region, and the charging service fee is optimized and adjusted; step S4, based on the adjusted charging service fee, the user charging position weighted decision model is used to decide the optimal user fast-charging load charging position. Compared with the prior art, the present invention has the advantages of effectively guiding users to charge reasonably, reducing user charging costs, and improving the voltage of the distribution network.

According to the adaptive fault-tolerant control method for the island micro-grid under the extended state observer, a feedback linearization model of the alternating current micro-grid is constructed by using the three-order extended state observer and a power generation cost optimization method, and the equivalence of a sensor fault and an actuator fault is revealed from a brand new angle of control; a unified sensor and actuator fault model is provided based on a micro-grid physical system, a self-adaptive fault-tolerant control method is provided by using a modified distributed consistency protocol, and the system voltage quality and the optimal economic dispatching are maintained under the condition of unknown sensor and actuator faults. According to the method, information of local and adjacent distributed generators is utilized, and the reliability, the efficiency and the fault-tolerant capability of the micro-grid system are improved.

This invention relates to the field of microgrid control technology, and discloses a distributed harmonic control method, device, and multi-inverter system for multi-inverter systems. In this invention, adjacent inverter control units are connected to form a ring network. During harmonic control, the output voltage and output current of the inverter in the inverter control unit are used to separate the fundamental and harmonic components. Based on the obtained fundamental component, the fundamental component of the outer loop reference voltage is calculated. The harmonic power is calculated based on the harmonic current component. Combined with the harmonic power of other interconnected units, a harmonic power sharing controller is calculated to determine the harmonic voltage gain coefficient. Based on this coefficient and the harmonic current component, the harmonic component of the outer loop reference voltage is obtained. The outer loop reference voltage is then calculated, and the control voltage for the corresponding three-phase inverter bridge is obtained from this reference voltage. This invention is unaffected by grid interference and feeder impedance mismatch, compensates for voltage distortion caused by nonlinear loads, and achieves precise harmonic power distribution between the DG (Distributed Generator and Controller).

The application relates to the technical field of source network load storage, and discloses a source network load storage coordination method, which comprises the following steps: dividing an electric power network into multiple basic control areas; evaluating a first electrical coupling strength index between the basic control area and its adjacent area; if the first electrical coupling strength index is greater than or equal to a coupling threshold value for a first duration, then the associated basic control area is combined into a coordinated control group, and a regional coordination controller is selected as a master controller of the coordinated control group; evaluating a second electrical coupling strength index between each basic control area in the coordinated control group; if the second electrical coupling strength index between the areas is less than the coupling threshold value for a second duration, then the coordinated control group is dissolved, and each basic control area is switched back to an operation mode independently managed by the configured regional coordination controller. The source network load storage coordination method realizes coordinated control by monitoring the coupling strength between the areas in real time.

The present application is a voltage-reactive control method, device and medium based on centralized optimization, which belongs to the field of power system. In view of the unreasonable problem of existing optimization methods, the present application provides a voltage-reactive multi-mode optimization control method based on centralized optimization, including: detecting and identifying the instructions issued by the upper layer optimization; setting the voltage adjustment interval, and setting the local voltage-reactive curve according to the instruction result; outputting the reactive power reference value of the inverter according to the local voltage-reactive curve; regulating the reactive power of the inverter according to the reactive power reference value of the inverter, and adjusting the grid connection point voltage until it is stable; judging whether the stable grid connection point voltage is within the voltage adjustment interval; periodically detecting the grid connection point voltage value, and judging whether the detected grid connection point voltage fluctuates greatly. The present invention improves the compatibility of the inverter with the upper layer optimization, effectively suppresses the voltage fluctuation and over-limit of the power grid, and improves the voltage support capacity of the inverter, the quality of the power grid voltage, and the reliability of the power grid operation.

The invention discloses a low-voltage distribution network flexible voltage regulation method and system, and the method comprises the steps: S1, the AC side of an AC-DC converter Cn (n = 1, 2,..., N) is connected in parallel to a low-voltage AC distribution network, the DC side is connected in parallel to a DC line, and the AC-DC converter C1 is close to the power supply side and is started to operate in a DC constant voltage control mode; starting the AC / DC converter Cn (n = 2,..., N) to operate in a constant power control mode; s2, the AC-DC converter Cn (n = 2,..., N) collects AC side voltage; if the AC side voltage is lower than a set voltage threshold lower limit, the AC-DC converter sends active power to an AC line; if the AC side voltage is higher than a set voltage threshold upper limit, the AC-DC converter absorbs active power from an AC line; and if the AC side voltage is within the set threshold range, the AC-DC converter is in a standby state. According to the invention, the problems of low voltage caused by long distance of the low-voltage distribution network, heavy load of lines and overvoltage caused by distributed photovoltaics are solved.

The invention discloses a converter fault ride-through control method, device, equipment, medium and product, and the method comprises the steps: determining whether the voltage drop of a power grid is greater than a preset voltage drop value or not when a short-circuit fault occurs in the power grid, and judging whether the short-circuit current is greater than a preset current value or not when the voltage drop is greater than the preset voltage drop value; when the current value is greater than the current preset value, based on the virtual synchronous machine, generating a motor PWM control instruction by taking the short-circuit current and the virtual resistance current as feedback quantities and taking a current inner ring given value of the virtual synchronous machine as a reference quantity; the output voltage of the power grid is adjusted through dynamic reactive power adjustment, and the output power of the motor is adjusted through dynamic active power adjustment; and when the current is not greater than the current preset value, adjusting the output voltage of the power grid by adopting dynamic reactive power adjustment, and adjusting the output power of the motor by adopting dynamic active power adjustment.

The present application discloses a power conversion system and a communication method thereof for transmitting common mode information. The communication method comprises the following steps: (a) providing at least two power conversion units, the first ends of which are electrically coupled, and each power conversion unit comprising a resonance control unit; (b) each power conversion unit generating an alternating harmonic wave according to a first electrical signal at the first end thereof, wherein the amplitude of each alternating harmonic wave represents the first information of the corresponding power conversion unit, and the frequencies of all alternating harmonic waves are the same; (c) injecting the corresponding generated alternating harmonic wave at the first end of each power conversion unit, and using the resonance control unit in the power conversion unit to carry out closed-loop suppression on the corresponding generated alternating harmonic wave, and controlling the resonance control unit to output a second electrical signal related to the first information, which comprises common mode information or is capable of further generating common mode information with the injected alternating harmonic wave. The present application can transmit common mode information without relying on additional communication lines.

This invention relates to the field of power optimization technology, specifically disclosing a virtual power plant optimization operation method based on multi-energy coupling. The method includes: extracting the thermal damping characteristics of each target node in a building complex and calculating the energy repayment demand; simulating the power superposition effect of simultaneous startup of multiple nodes, verifying safety constraints by combining grid transformer capacity limitations and ramp rate, and extracting the rebound risk time window; analyzing the user's thermal comfort tolerance limit and energy repayment demand, and dividing the heterogeneous recovery echelons; performing time-series optimization on each echelon to determine the optimal start-stop time group; analyzing latent cooling potential energy in real time and performing conflict analysis with remaining sensible heat demand, and predictively intercepting and dynamically reducing oversaturated redundant nodes. This invention helps to smooth out the rebound peak during the load recovery period and utilizes building thermal inertia, ensuring both grid safety and user comfort.