1036results about "Polyphase network asymmetry elimination/reduction" patented technology

The invention relates to the technical field of power generation, power transformation or power distribution, and discloses a control method for preventing overload of an energy storage system transformer, which comprises the following steps: monitoring the three-phase total power and the power of each phase of a power grid side ammeter in real time, and calculating the three-phase unbalance degree based on the three-phase total power when the three-phase unbalance phenomenon occurs; when the three-phase unbalance degree is greater than a preset unbalance degree threshold value, dynamically adjusting the charging power of the energy storage converter according to a starting threshold value, a charging limiting threshold value and a charging forbidding threshold value by adopting a multi-threshold value dynamic adjustment mechanism; the phase with the maximum deviation between the power of each phase and the average power of the three phases is calculated as an overload phase, load reduction is performed on the overload phase based on a load increasing and decreasing strategy, load increasing is performed on a non-overload phase, and the adjusted three-phase power is obtained; a power distribution instruction is calculated in real time in combination with a dynamic response mechanism, and the three-phase unbalance degree does not exceed a safety threshold value in cooperation with total power control. The problems of easy overload, three-phase imbalance and slow response of a transformer in the prior art are solved, and the purposes of accurate load control, high system stability and high response speed are achieved.

The invention, which relates to the technical field of optical storage and charging, discloses an optical storage and charging cooperative control method for a transformer area, and the method comprises the steps: carrying out the intelligent and multivariate collection and prediction through intelligent equipment, constructing a function through collected data, solving an optimal solution, selecting an optimal optical storage and charging cooperative control strategy from the optimal solution, generating a corresponding control instruction, and carrying out the transmission of the corresponding control instruction. Cooperative regulation and control of a photovoltaic power generation system, an energy storage system and a charging pile system are achieved, a feedback and correction mechanism is further established, and it is ensured that the photovoltaic storage and charging system stably operates according to a preset strategy. According to the transformer area light storage and charging cooperative control method, a light storage and charging cooperative control mechanism is established by comprehensively considering photovoltaic power generation, an energy storage system and a charging pile system, power resource distribution in a transformer area is optimized, maximum consumption of photovoltaic power generation is achieved, the light abandoning phenomenon is reduced, meanwhile, unnecessary charging and discharging loss of the energy storage system is reduced, and the power utilization rate of the transformer area is improved. And the impact of disordered charging of the charging piles on a power grid system is relieved, so that the overall operation performance of a transformer area power system is improved.

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

The invention relates to the technical field of power dispatching management and control, and discloses a power distribution network power dispatching method based on a virtual power plant AI large model and demand response, and the method comprises the steps: collecting the operation data of a power distribution network, and constructing a feature vector; an AI large model is adopted to calculate and predict load output, and joint uncertainty information is output; calculating a system power unbalance amount, and generating a scheduling strategy; issuing a scheduling instruction corresponding to the scheduling strategy and executing the scheduling instruction; comprehensive performance evaluation indexes are calculated, and whether a performance reduction reason diagnosis mechanism is started or not is judged; according to the method, the AI large model is adopted, the load power, the photovoltaic output and the wind power output are predicted at the same time through a multi-task learning strategy, and the correlation among multiple variables is fully utilized; by constructing a multi-objective optimization model, comprehensively considering economy, safety and reliability and adopting an improved particle swarm optimization algorithm for solving, coordinated optimization configuration of demand response resources is realized, power grid fluctuation is effectively reduced, and power supply reliability is improved.

The invention discloses a three-phase imbalance compensation method and system based on negative sequence current and a medium, and relates to the technical field related to power imbalance compensation, and the method comprises the steps: executing the three-phase current, voltage and reactive power data collection of a power distribution network, and carrying out the three-phase imbalance recognition through negative sequence current analysis; carrying out additional acquisition of a load mode and environment data on the power distribution network; taking the data acquisition result and the additional data set as input data to execute negative-sequence current change trend prediction; a double-layer compensation device is configured for cooperative control optimization; power distribution network balance compensation is executed through a time sequence compensation strategy, and time sequence window feedback is established; and carrying out adaptive strategy correction. The technical problems that in the prior art, a three-phase imbalance compensation strategy lacks perspectiveness and self-adaptive capacity and cannot cope with a dynamically-changing power grid scene, and consequently compensation precision and stability are poor are solved, and the technical effects that perspectiveness and predictive compensation is achieved, and three-phase imbalance compensation precision and stability are improved are achieved.

The invention discloses an intelligent commutation type three-phase imbalance dynamic treatment method for a power distribution network, relates to the technical field of power distribution network treatment, and aims to solve the problem of poor treatment effect of three-phase imbalance. By using the data mining and analysis technology, not only can the cost minimization path be calculated according to the current state, but also the future change can be pre-judged in combination with the load dynamic trend, so that the formulated switching strategy is more prospective and accurate, the generated high-dimensional mapping vector fuses the node characteristics and the neighbor node characteristics, and the switching efficiency is improved. By combining the use of a nonlinear activation function, the model can adaptively learn a load change rule, sensor equipment integrates various sensors and chips, has the functions of environment monitoring, power management and the like, and is matched with structural components to ensure the reliable operation of the device, reduce the operation and maintenance cost and difficulty and prolong the service life of the equipment.

The invention provides a platform area power grid tail end voltage flexible regulation and control method and system. The method comprises the steps that a sampling module measures common coupling point voltage at the tail end of a platform area power grid; the impedance calculation unit obtains load end impedance; the current calculation unit calculates the current of the common coupling point through the voltage of the common coupling point and the impedance of the load end; the current resolving unit is used for resolving the common coupling point current into negative-sequence current and zero-sequence current; the compensation current unit calculates a compensation current component required for maintaining the stability of the voltage at the tail end of the transformer area power grid through the negative-sequence current and the zero-sequence current; the PWM unit generates a compensation current control signal; and the IGBT module outputs compensation current to the common coupling point. When three phases are unbalanced, the first disturbance generation circuit accurately injects a disturbance signal to effectively regulate and control the voltage at the tail end of a power grid in a transformer area; and the second disturbance generation circuit analyzes the stability of the tail end of the station area power grid by using coordinate transformation and a PI controller.

The embodiment of the invention discloses a collaborative optimization method and device for the power quality of a high-permeability transformer area. The method comprises the following steps: acquiring three-phase voltage, three-phase current and environment temperature data; the voltage deviation, the three-phase unbalance degree, the total harmonic distortion rate and the reactive vacancy of the high-permeability transformer area are calculated based on the three-phase voltage and the three-phase current; taking voltage deviation as a primary optimization target, considering optimization of three-phase unbalance degree, total harmonic distortion rate and reactive vacancy, constructing a multi-target optimization function, and carrying out dynamic constraint on an optimization process based on environment temperature data; solving the multi-objective optimization function by adopting an optimization algorithm to obtain a group of optimal decision variables, and converting the decision variables into corresponding control instruction sets; and the control instruction set is issued to the on-load voltage regulating transformer, the reactive compensation equipment and the power electronic compensation module for execution. Therefore, the problems of voltage out-of-limit, harmonic pollution and imbalance are effectively solved through a multi-target cooperation and temperature self-adaption mechanism.

The invention relates to the technical field of electric power engineering, and provides an agricultural and pastoral area power grid interphase power mutual aid configuration system and method.The agricultural and pastoral area power grid interphase power mutual aid configuration system comprises a power source monitoring and regulating unit used for monitoring output power of various power sources in an agricultural and pastoral area in real time and regulating power source output according to a preset algorithm, and the preset algorithm is based on the multi-energy complementation principle; a power distribution algorithm is constructed by combining power supply historical output data, real-time meteorological data and load prediction data, a power grid data acquisition and analysis unit is connected with a power transmission line, a transformer substation, power distribution equipment and the like, parameters such as voltage, current and power of each phase of a power grid are acquired, and the three-phase unbalance degree of the power grid is calculated through a data analysis model. Through the synergistic effect of the power supply monitoring and regulating unit and the power grid data acquisition and analysis unit, and in combination with a multi-energy complementary algorithm and a three-phase unbalance degree real-time calculation model, the limitation that a traditional load balancing device can only statically regulate a fixed load is broken through.

The invention is suitable for the technical field of power electronics and power transmission, and provides a low voltage ride-through control method and system for a network construction type converter, and the method comprises the steps: carrying out the conventional VSG control according to a VSG control strategy, and continuously monitoring the difference between the voltage of a power grid and a set reference value, so as to judge whether a fault occurs or not; when it is detected that the power grid breaks down, homodyne control is carried out on an active power control ring and a reactive power control ring of the grid-forming type converter so as to fix the phase and the amplitude of the output voltage of the converter; calculating and injecting a positive sequence compensation voltage and a negative sequence compensation voltage according to the drop degree of the power grid voltage; and according to the predicted impact current value, dynamically calculating and inputting adaptive virtual impedance. The power angle and the voltage in the fault period can be ensured to be stable, transient overcurrent is effectively restrained, and large power fluctuation is not caused.

The invention belongs to the technical field of electric energy quality control, and provides an energy storage type medium-voltage voltage sag and interruption treatment device and a control method thereof.The energy storage type medium-voltage voltage sag and interruption treatment device is arranged between a large power grid and a load in series and comprises a series converter PCS1, a parallel converter PCS2, an energy storage module, an injection type series transformer T1, a parallel transformer T2, a bypass static switch STS and a bypass relay KM1; wherein the injection type series transformer T1 is connected with a large power grid, and the parallel transformer T2 is connected with a load; the series converter PCS1 is connected with the injection type series transformer T1 through the bypass static switch STS and the bypass relay KM1, and compensation voltage is generated in real time through the injection type series transformer T1; the parallel converter PCS2 is respectively connected with the parallel transformer T2 and the common direct current busbar; and the energy storage module is arranged on the common direct current busbar between the series converter PCS1 and the parallel converter PCS2 in parallel.

The invention discloses a power and current prediction control method and system for a doubly-fed motor grid-side converter, and relates to the technical field of converter monitoring, and the method comprises the steps: predicting a current value, an active power value and a reactive power value of the doubly-fed motor grid-side converter in a next control period according to a power prediction model and a current prediction model; designing an improved value function by considering active power, reactive power and a current component of a dq axis under a dq coordinate system, and obtaining the action duration of a voltage vector in a next control period by minimizing the value function; and based on the action duration of the voltage vector in the next control period, controlling the power switch of the grid-side converter of the doubly-fed motor. According to the method, power and current parameter control of the doubly-fed motor grid-side converter under the three-phase balance working condition is considered, and efficient control of the doubly-fed motor grid-side converter under the three-phase power grid voltage balance condition is achieved.

The invention discloses a dynamic load balancing method and device for an intelligent charging pile management system, and the method comprises the steps: obtaining the operation parameters of a target area transformer corresponding to the intelligent charging pile management system in a current control period, so as to obtain the real-time total load of the target area transformer in the current control period; dynamically calculating the real-time available capacity of the transformer based on the rated power and the real-time total load of the transformer in the target station area; calculating the predicted available capacity of the transformer in the next control period through a load prediction model based on the historical power data and the external environment variables; and according to the real-time available capacity and the predicted available capacity, dynamically adjusting the operation power of the plurality of accessed charging piles, and expanding the number of the accessible charging piles in a load trough period. By fusing the real-time power grid state and the multivariable predicted future load demand, the dynamic fine adjustment of the power of the charging pile and the prospective expansion of the off-peak access amount are realized, the safety of the power grid is ensured, and the capacity utilization efficiency of the transformer is remarkably improved.

The invention discloses a global cooperative control method and system for unbalanced fault ride-through of a multi-terminal DC power grid, and the method comprises the steps: constructing a fault detection model based on the positive sequence voltage drop depth and the negative sequence voltage size of the AC side of each converter station, automatically judging an unbalanced fault, and carrying out the fault detection when the fault is detected. Calculating the maximum allowable active current based on a fault station unbalanced current control model to carry out current limiting control on the converter station; and carrying out output power adjustment on the DC voltage deviation of the non-fault station based on the non-fault station power cooperation model. Asymmetric fault ride-through is carried out by using a constrained and optimized current instruction generation algorithm, and the capacity of a converter is dynamically and accurately distributed and utilized in a limited manner, so that the voltage support capability of a fault alternating-current power grid is maximized, and globally optimized adaptive power distribution is realized; the power of the non-fault station is calculated and distributed in a centralized manner and is dynamically adjusted according to the real-time available capacity, so that the self-adaption and global optimization of the running state change of the power grid are realized, and the fault handling toughness and reliability of the power grid are improved.

The invention relates to the technical field of power distribution network monitoring, in particular to a power distribution cabinet line intelligent detection method and system, and the method comprises the steps: collecting node voltage, phasor current and active / reactive power of each power distribution cabinet, attaching a sampling period and a quality identifier, and carrying out the arrangement according to a timestamp; carrying out edge calculation on harmonic waves, flicker, unbalance, missing measurement compensation and initial estimation, and generating a straight-through UDP stream and a storage stream; a real-time interface is aligned and fused with a topology version according to a unified time reference, state estimation is carried out, and a node initial value set is output; s4, according to the initial value and topological modeling node digital twinning (index recovery load), obtaining online parameters through four-stage sub-step discrete + UKF joint estimation; accessing a real-time simulation platform through HiL, and recharging in the same period; a variable damping impedance stable interface is adopted, and when consistency and a threshold value are met, a digital snapshot containing an online parameter, a steady-state quantity and a transient abstract is generated. According to the method, low time delay of measurement alignment, credible state estimation, digital twinborn self-adaption, hardware-in-loop stability and verifiable result release can be realized, so that the fault detection, positioning and evaluation capabilities of the power distribution network are improved.

The invention relates to an electric energy quality treatment method and system for a unified electric energy quality conditioner. The method comprises the steps of system state collection and global state vector construction, TD3 strategy network action generation and parameter mapping, MPC optimization solution and control instruction generation, intelligent agent execution control instruction and environment feedback, and TD3 strategy updating and reward function construction. According to the method, a UPQC series side and a UPQC parallel side are modeled into an intelligent agent with autonomous behaviors, and the intelligent agent serves as a key execution unit in a TD3-MPC control architecture to participate in collaborative decision making; under joint scheduling of reinforcement learning and a rolling optimization mechanism, active and accurate adjustment of key power quality indexes such as voltage, current and harmonic waves by the UPQC is realized, the control precision and response speed of the UPQC in a complex disturbance environment are improved, the problems of voltage fluctuation, harmonic pollution, reactive power imbalance and the like in a micro-grid are effectively improved, and the power quality of the micro-grid is improved. And the overall effect of UPQC electric energy quality treatment is improved.

The invention relates to the technical field of hybrid submarine cable system maintenance, in particular to a reactive compensation method, system and device for a hybrid submarine cable system and a medium, and the method comprises the steps: obtaining the standard electrical parameters of an oil-filled submarine cable and an XLPE submarine cable; constructing an electromagnetic transient simulation model of the hybrid submarine cable system; calculating an ideal reactance compensation range; a plurality of groups of series reactance compensation schemes are set and applied in the electromagnetic transient simulation model, and three-phase transmission power distribution, total transmission power and voltage unbalance degree under each series reactance compensation scheme are simulated and calculated; comparing simulation results of each series reactance compensation scheme, and selecting the series reactance compensation scheme with the maximum total transmission power on the premise that the three-phase power unbalance degree is lower than a preset equilibrium constraint condition as an optimal compensation scheme; an optimal compensation scheme is applied in a hybrid submarine cable system. According to the invention, three-phase power balance and total transmission power maximization of the hybrid submarine cable system can be realized at the same time.

The invention provides a method and a system for evaluating, regulating and controlling operation stability and electric energy quality of an active transformer area based on edge calculation. The operation information such as low-voltage side voltage and current is collected through the area side edge calculation terminal, the indexes such as the load rate, the power factor, the three-phase unbalance degree, the voltage deviation and the voltage harmonic distortion rate are calculated, and the operation stability and the electric energy quality of the area are comprehensively evaluated after scoring according to a preset rule. And a distributed power supply, an energy storage device and a reactive power compensation device in the transformer area are regulated and controlled according to an evaluation result, so that the operation stability and the electric energy quality are improved. The method can comprehensively reflect the operation stability and the electric energy quality of the transformer area, and is beneficial to improving the operation stability and the power supply quality.

The invention relates to the technical field of photovoltaic power generation cloud platforms, and discloses a multi-site energy storage cluster cloud scheduling platform based on photovoltaic power generation prediction, and the platform employs a real-time data collection and space-time synchronization module to carry out the timestamp alignment and space grid processing of multi-source heterogeneous data. In combination with a dynamic priority scheduling mechanism of a prediction task distribution module based on volatility and a power grid security situation, the effects of cooperative execution of prediction tasks and priority guarantee of key tasks are achieved; through containerized parallel reasoning and consistency Hash load balancing technology of a distributed prediction calculation module, time consistency of a multi-node prediction result is ensured, and a rolling optimization algorithm and a time sequence constraint embedding strategy of a unified scheduling decision module are adopted. Accurate calculation of power generation unbalanced power and time sequence consistency generation of an energy storage strategy are achieved, and through instruction verification and conflict detection and filtering frequency reduction processing of a smoothing module, the effects of prolonging the service life of equipment and guaranteeing stable operation of a power grid are achieved.

The invention relates to the technical field of three-phase electric energy meters, and discloses an equivalent apparent power implementation method, device and equipment of a three-phase electric energy meter and a medium. Comprising the following steps: acquiring cyclic wave voltage sampling data and cyclic wave current sampling data of each phase of the three-phase electric energy meter in at least one cyclic wave; calculating the equivalent voltage of the three-phase electric energy meter according to the cyclic wave voltage sampling data; calculating the equivalent current of the three-phase electric energy meter according to the cyclic current sampling data; and calculating the equivalent apparent power of the three-phase electric energy meter based on the equivalent voltage and the equivalent current. According to the invention, the accuracy of apparent electric energy charging and line loss calculation can be improved.

The invention relates to a DSTATCOM harmonic current detection and tracking control method, which comprises the steps of collecting instantaneous current and instantaneous voltage of a load side of a power distribution network, processing a power distribution network instruction current signal detected in real time through an improved dq0 compensation amount detection algorithm, obtaining a to-be-compensated negative-sequence frequency doubling component and a to-be-compensated specific subharmonic component, and carrying out harmonic current tracking on the to-be-compensated negative-sequence frequency doubling component and the to-be-compensated specific subharmonic component. The obtained negative sequence frequency doubling component and the specific sub-harmonic component to be compensated are sent into a current inner loop, three-phase reference voltage is obtained through a PIR controller, generation of PWM pulses is controlled, then on-off of a DSTATCOM bridge arm switching tube is controlled, and a closed-loop control system is formed. A path for extracting an orthogonal component in instruction current is reconstructed, the positive sequence fundamental current detection error under the three-phase imbalance working condition is remarkably reduced, a compensation current control strategy based on a PIR controller is adopted in a current inner loop, and zero-static-error tracking of a frequency doubling component and a low-frequency harmonic component in compensation current is achieved.

The invention relates to the technical field of energy storage systems, in particular to a symmetric / asymmetric fault ride-through control method for a network-forming type energy storage converter, which comprises the following steps of fault detection and classification, adaptive control target decision and multi-mode unified control. According to the method, adaptive and intelligent fault ride-through is realized, the control accuracy and efficiency are improved, the adaptability and robustness of the energy storage system in different power grid fault scenes are enhanced, the center of gravity is dynamically adjusted and controlled according to the charge state of the energy storage system or the received power grid dispatching instruction, the maximum utilization of system resources is realized, and the power grid fault ride-through efficiency is improved. The voltage and frequency support is provided for the power grid, the response speed is far higher than that of traditional deviation adjustment, the voltage support effect at the moment of a fault is greatly improved, sudden change of power and current is effectively prevented, secondary impact on the recovered power grid caused by off-grid of the converter or power oscillation is avoided, and the friendliness of network forming equipment is embodied.

The invention discloses a transformer area-oriented mobile energy storage scheduling method, which comprises the following steps of: acquiring historical and real-time measurement data of each node based on a three-phase line topological structure and line parameters of a transformer area; respectively establishing a quantile time sequence prediction model for the load and the photovoltaic output of each node in the prediction time period, and obtaining a quantile prediction set based on the load and the photovoltaic output; generating scenes / samples according to the quantile prediction set, and load and photovoltaic samples of each node at each moment contained in each scene; establishing a three-phase unbalanced power flow model satisfying a branch balance and power flow relationship, and establishing a mobile energy storage model based on node selection and energy constraint; for a three-phase unbalanced power flow model and a mobile energy storage model, joint optimization of a rolling time domain is established, and the optimization takes expected operation cost minimization as a target; and the optimized three-phase unbalanced power flow model and the mobile energy storage model are used for scheduling, so that the problems of safe operation and efficient absorption of the high-permeability photovoltaic transformer area are solved.

The invention belongs to the technical field of power grid control, and relates to a transformer area flexible interconnection system three-phase imbalance control method and device and a medium. Taking the transformer area converter controlled by the PQ control algorithm as a target transformer area converter; collecting a first control parameter output by an active power PI controller of the target transformer area converter; based on the upper and lower limits of the voltage target value of the DC bus, performing amplitude limiting setting on the first control parameter of the target transformer area converter to obtain the voltage target value; subtracting the voltage target value from the actual voltage value of the direct-current bus, inputting the difference value into the PI controller, and outputting a second control parameter of the target transformer area converter; taking the second control parameter as a direct-axis current target value, subtracting the direct-axis current target value from a direct-axis current actual value, and taking the difference value as the input of a direct-axis current PI controller; and controlling the target transformer area converter based on the voltage modulation signal output by the PQ control framework. The scheme can effectively improve the power supply reliability of the power distribution area and stabilize the DC bus voltage.

Disclosed in the present invention are an operation and maintenance method and apparatus for severe overload and three-phase imbalance of a distribution transformer, and a medium. The method comprises: by quantifying the degree of difference between devices as the distance between two points, performing clustering analysis on an operation and maintenance state of a distribution transformer, so as to obtain a classification result; and on the basis of a short-term single-phase severe overload category and a short-term three-phase severe overload category in the classification result, establishing a multi-objective optimization model and solving same, so as to obtain a multi-objective optimization result, and on this basis, formulating a day-ahead source-load distribution transformer operation and maintenance plan and performing operation and maintenance control on a distribution network. The present invention provides an operation and maintenance method and apparatus for severe overload and three-phase imbalance of a distribution transformer, and a medium. Solving a multi-objective optimization model to obtain a multi-objective optimization result can ensure that operational risks caused by three-phase imbalance are reduced while balancing three-phase loads, such that differentiated operation and maintenance can be achieved by means of a day-ahead source-load distribution transformer operation and maintenance plan, thereby solving the problem of difficulty in managing severe overload and three-phase imbalance of a distribution transformer to formulate a targeted operation and maintenance plan.

The invention relates to the technical field of power monitoring, in particular to a concentrator with an electrical equipment state monitoring function. Obtaining an unbalance degree according to the state characteristic values among the three phases; clustering is carried out according to the unbalance degree of all historical moments, and distribution intensity is obtained according to interval characteristics of different moments in a moment cluster; obtaining a data similarity according to the unbalance degree in the time cluster; obtaining reference credibility according to the moment quantity characteristics, the distribution intensity and the data similarity in the moment cluster; according to the difference characteristic of the unbalance degree corresponding to the current moment and the reference moment cluster and the reference credibility of the reference moment cluster, obtaining the abnormity degree; and obtaining an anomaly trend value according to the anomaly degree of the adjacent historical time period of the current moment. The early warning index of the current moment is obtained according to the abnormity degree and the abnormity trend value, and early warning is carried out, so that the monitoring accuracy of the concentrator on the power utilization state of the electrical equipment is improved.

The invention relates to the technical field of voltage compensation, in particular to a rapid compensation method for realizing stable voltage output of a distribution line in a transformer area. The method comprises the following steps: dividing a plurality of characteristic intervals according to the difference between each phase of voltage data and a standard voltage; determining a deviation characteristic value of the phase voltage according to the correlation degree between the phase voltage and each type of other data of the node, the maximum deviation value of the phase voltage and the maximum deviation value of each type of other data; according to the intersection-to-union ratio and the deviation characteristic value of each characteristic interval and each overrun interval, determining an influence characteristic value of the characteristic interval; determining a compensation coefficient of the phase voltage of the node according to the three-phase unbalance degree of each key node and the corresponding intermediate node and the influence characteristic value of the characteristic interval; and determining the reactive compensation amount according to the rated voltage value, the real-time voltage and the line impedance in response to the fact that the real-time voltage is located outside the preset interval. The method can improve the stability of voltage output of the distribution line in the transformer area.

The embodiment of the invention discloses an unbalanced load control method, device and equipment based on parallel energy storage converters. A specific implementation mode of the method comprises the following steps: acquiring an electrical information set of the converter; for each parallel energy storage converter, the following generation steps are executed: carrying out sequential extraction on converter three-phase voltage information and converter three-phase current information; performing voltage frequency recovery control on the parallel energy storage converter to obtain a positive sequence voltage component set; performing voltage and current inner and outer loop control on the positive sequence voltage component set to obtain a converter bridge arm voltage control information set; performing suppression control on the three-phase negative sequence electrical information set and the three-phase zero sequence electrical information set to obtain a converter compensation signal set; and generating a converter switch control information set, and performing unbalanced load control processing on the parallel energy storage converter. According to the embodiment, the regulation and control capability and timeliness of the parallel energy storage converter under the unbalanced load condition can be efficiently regulated, and the safety of the energy storage converter is improved.

Disclosed embodiments provide methods, systems, and computer program products for implementing enhanced phase power load balancing of a set of systems (e.g., the set of systems of a data center) using a subset of the systems. Disclosed embodiments extract phase currents of a three-phase power source of the set of systems, and determine, based on extracted phase currents for the set of systems, input phase power load balancing for the subset of the systems. Disclosed embodiments alter the current input phase power balancing of the subset, unbalancing the input phase power load for the subset of the systems to provide enhanced phase power load balancing of the set of systems. Altering the current input phase power balancing for the subset of the systems can be implemented by power shifting between power supply units (PSUs), phase rotations, or input phase switching of power distribution unit (PDU) switchable output ports.

The invention discloses an active and reactive comprehensive oscillation quantity minimization cooperative control method under a current constraint condition, and the method comprises the steps: analyzing an inverter side current converter in a power grid voltage imbalance state, and quantifying the frequency doubling fluctuation quantity of active power and reactive power caused by a negative sequence component; a third harmonic voltage compensation method is adopted to suppress negative sequence current, the third harmonic voltage compensation amount of the converter is dynamically adjusted, and three-phase current balance is regulated and controlled; on the basis of active and reactive power fluctuation suppression of a negative-sequence current compensation method, an optimization function with the purpose of minimizing the comprehensive fluctuation quantity of active power and reactive power is constructed by utilizing controllable negative-sequence current compensation quantity and eliminating frequency doubling fluctuation quantity of active power and reactive power, and an optimal negative-sequence current compensation scheme is solved in real time by adopting a particle swarm optimization algorithm. Cooperative suppression of three-phase current balance and power oscillation is achieved, and the operation stability and the power transmission capacity of the inverter side converter under an asymmetric fault are remarkably improved under the current amplitude limiting condition.