670 results about "Voltage limit" patented technology

The invention relates to a V2G-based alternating current charging power adjusting method and device. The method comprises the following steps: carrying out multi-scale data acquisition and preprocessing on a V2G alternating current charging system to obtain a standardized system state data set; constructing a system dynamic model comprising a power grid voltage characteristic and a charging power characteristic; carrying out decomposition to obtain a power output mapping relation calculation, and obtaining a power modulation control parameter; establishing a fast and slow time scale coordination control framework, and designing a power regulation agent and a voltage regulation agent to obtain a coordination control strategy; checking a charging power limit value constraint, a voltage limit value constraint and a power factor constraint to obtain a constraint violation judgment result, and executing constraint projection calculation to obtain a target control instruction; and controlling a power conversion circuit of the charging pile to execute power regulation operation. According to the invention, a hierarchical control structure is adopted, the control complexity of the system is reduced, and the robustness and the adaptive ability of the control strategy are improved.

The invention relates to the technical field of intelligent power grids, and provides an intelligent operation centralized control center intelligent scheduling interaction method and system, and the method comprises the steps: generating a heat distribution gradient through environment noise filtering, reflecting the temperature field change of equipment, obtaining a voltage amplitude envelope through fundamental wave and harmonic wave separation, and monitoring the power quality; a current fluctuation coefficient is extracted by combining segmented deviation analysis to evaluate a line load state, and frequency fluctuation parameters are captured by using time domain statistics to track system stability. By constructing a dynamic association map, heterogeneous data such as thermodynamics, electrical quantity, load characteristics and synchronous states are mapped to power grid topological nodes, and a cross-dimension association relationship is established to realize whole-network state coupling analysis. An overload risk, a voltage out-of-limit probability and a system instability threshold are quantified through a hierarchical evaluation mechanism, a multi-target optimization constraint condition is formed, and finally a scheduling strategy considering equipment safety, economy and power supply reliability is generated. When the power system operates, intelligent scheduling is carried out according to the operation state of the power grid.

A voltage limiting device (15) for constant current circuits (10) comprises input terminals (153) for connecting the voltage limiting device to a current supply (11) of a constant current circuit, output terminals (154) for connecting the voltage limiting device to a load, a voltage clamping circuit (151), and a switching circuit (152). The input terminals (153) are connected to the output terminals (154) under a normal operating condition. The voltage clamping circuit (151) is configured to clamp a voltage across the output terminals to a first voltage threshold and the switching circuit is configured to short-circuit the output terminals when a second voltage threshold across the output terminals is exceeded longer than a predetermined time period.

The invention relates to the technical field of automatic control, and discloses a PID (Proportion Integration Differentiation) intelligent pressure reducer controller, which comprises the following steps of: judging whether an environment disturbance or a load sudden change event exists according to a system load change rate and sensor feedback stability, constructing a master control-controlled coupling characteristic matrix by adopting a dual-channel data fusion method, performing attribution splitting on each disturbance channel, and obtaining a PID (Proportion Integration Differentiation) intelligent pressure reducer. PID parameters are dynamically adjusted according to the principal component weight of a disturbance channel, a variable parameter PID adjustment matrix is constructed, filtering smoothing is carried out on sampled signals through an extended Kalman filtering algorithm, a feedback closed-loop correction vector based on sampling residual errors is constructed, a historical offset tracking and switching value boundary judgment mechanism is introduced, fine tuning suppression is carried out on control signals of a motor driving mechanism, and the control signals of the motor driving mechanism are output. Judging whether a mechanical limiting protection device needs to be activated or not; and if yes, automatically triggering voltage limiting protection logic and locking the current control quantity. The method has the advantage of improving efficient and stable operation.

The invention discloses an overhead line-high voltage cable sheath lightning stroke induced voltage calculation method. At present, the voltage of a lightning stroke point, a connection point of an overhead line and a cable and a point in a well of each joint along a cable sheath cannot be obtained at the instantaneous moment of lightning stroke of the overhead line on site. According to the method, electromagnetic transient simulation modeling is carried out on actual spatial positions, structural parameters and material parameters of field overhead lines and high-voltage cables, electromagnetic transient simulation modeling is carried out on lightning currents, electromagnetic transient modeling is carried out on normal operation conditions and actual lightning stroke fault conditions of an electric power system, and after the randomness of the fault occurrence moment is considered, the electromagnetic transient simulation modeling is carried out on the actual lightning stroke fault conditions of the electric power system. And the maximum lightning stroke induced voltage value of each point along the cable sheath after lightning stroke is calculated through electromagnetic transient simulation software, so that a reference basis is provided for insulation matching design of the cable sheath of the overhead line-cable mixed line invaded by lightning current, and a foundation is laid for design evaluation of various subsequent voltage limiters and protectors.

To generate a charging path for a battery, a method includes generating simulation data for charging currents based on a battery model indicating an internal state of a battery, generating an initial look-up table (LUT) for the charging currents and preset battery voltage limits based on the simulation data, the initial LUT representing initial charging limit conditions of the battery for stages corresponding to the charging currents, generating a modified LUT by adjusting at least one of the initial charging limit conditions of the initial LUT, in response to the initial LUT failing to satisfy a threshold, determining a final LUT based on the modified LUT, in response to the modified LUT satisfying the threshold, and generating a charging path for the battery based on the final LUT.

The invention relates to an electronic assembly (100), comprising: - a switching device (102) for switching a main current path (103), wherein the switching device (102) comprises n series-connected semiconductor switching units (102.1, 102.2,..., 102.n), wherein n is a natural number excluding zero, - a voltage limiting device (114) connected in parallel with the switching device (102) and comprising at least one overvoltage protection component (107) and at least one diac (109) connected in series with the at least one overvoltage protection component (107), and - n surge arresters (110, 110.1, 110.2, ..., 110.n), wherein each one of the n surge arresters (110, 110.1, 110.2,..., 110.n) is connected in parallel with each one of the n semiconductor switching units (102.1, 102.2,..., 102.n) in a bijective relationship.

A monitored DC charging method for charging a vehicle rechargeable traction battery by way of a charging voltage source external to the vehicle is provided. The rechargeable traction battery has a nominal voltage of at least 500 V. In a checking step, the method includes detecting whether the charging voltage source has a surge protector which includes a voltage limiting element that is provided between a charging voltage potential and a ground potential of the charging voltage source and is set up to transition to a conductive state from a voltage below the nominal voltage. DC voltage is transmitted from the charging voltage to the rechargeable traction battery when the charging voltage source does not have the surge protector. At least one DC charging mode for transmitting DC voltage from the charging voltage source to the rechargeable traction battery is suppressed when the charging voltage source has the surge protector.

The invention discloses a feedback field weakening control method and system for a surface-mounted permanent magnet synchronous motor, and the method comprises the steps: collecting a rotation speed feedback value of a motor, and controlling the operation of the motor through employing a maximum torque current ratio if the rotation speed feedback value is smaller than a rated rotation speed; calculating a first flux-weakening rotating speed according to the real-time load rate and the bus voltage fluctuation, and if a rotating speed feedback value of the motor is greater than the first flux-weakening rotating speed, entering a first flux-weakening mode: calculating a difference value between an output voltage amplitude and the bus voltage, generating a d-axis current compensation value, and performing load compensation and rotating speed compensation on the d-axis current compensation value to obtain a d-axis current given value; the maximum value of the q-axis current is calculated, given voltage values of the d-axis and the q-axis are generated, and the motor is driven to operate; and calculating a second flux-weakening rotating speed according to the q-axis current maximum value and the voltage margin, and if the rotating speed feedback value of the motor is greater than the second flux-weakening rotating speed, entering a second flux-weakening mode: further limiting the q-axis current maximum value through a current limit circle and a voltage limit circle on the basis of the first flux-weakening mode.

The invention discloses a voltage out-of-limit control method and system for grid connection of a photovoltaic power generation system containing energy storage, and the method comprises the steps: building a grid connection model according to an equivalent structure diagram of grid connection of the photovoltaic power generation system containing energy storage; according to the grid-connected model, under the conditions that the line impedance is fixed and the load power is random and uncontrollable, the voltage of a grid-connected point is adjusted by controlling active power and reactive power output by an inverter; a dynamic participation factor is introduced, and the charge state of energy storage and the residual capacity of an inverter are taken into reference so as to carry out self-adaptive distribution of power. The method can effectively solve the problems of insufficient adjustment and response lag of a current power distribution network voltage out-of-limit control strategy.

The invention belongs to the related technical field of motor control, and discloses a permanent magnet synchronous motor field weakening control method and device fusing current feedforward and model prediction control, and the method comprises the steps: (1) building a multi-objective optimization function based on a torque tracking error, current fluctuation and voltage limitation of a permanent magnet synchronous motor, solving the multi-objective optimization function through an interior point penalty function and a Newton iteration method based on a feedforward instruction torque and a model prediction control instruction torque to obtain an optimal current pair of the permanent magnet synchronous motor; (2) constructing a field weakening control fusion model based on the obtained optimal current pair, the feed-forward instruction torque and the model prediction control instruction torque; and (3) fusing the feedforward instruction torque and the model prediction control instruction torque through the dynamic weight factor of the flux-weakening control fusion model, and obtaining a flux-weakening control instruction of the permanent magnet synchronous motor in combination with the optimal current pair, thereby realizing flux-weakening control of the synchronous permanent magnet motor. The method has a multi-target cooperation capability.

The invention relates to an electronic arrangement (100) comprising - a switching device (102) for switching a main current path (103), wherein the switching device (102) comprises n semiconductor switching units (102.1, 102.2, ..., 102.n) connected in series, where n is a natural number excluding zero, - a voltage limiting device (114) connected in parallel to the switching device (102), comprising at least one overvoltage protection element (107) and at least one diac (109) connected in series with the at least one overvoltage protection element (107), and - n surge arresters (110, 110.1, 110.2, ..., 110.n), wherein one of the n surge arresters (110, 110.1, 110.2, ..., 102.n) is connected in parallel to each of the n semiconductor switching units (102.1, 102.2, ..., 102.n) in a bijective assignment.

The invention provides a range switching circuit, a current detection circuit and an alternating current measuring instrument, and relates to the technical field of electric measuring instruments. The range switching circuit comprises a current input port which comprises a positive terminal and a negative terminal; the current and voltage conversion unit comprises a plurality of range gating branches, each range gating branch comprises a primary coil, a dotted terminal of the primary coil is electrically connected with the positive terminal, and a synonym terminal of the primary coil is electrically connected with the negative terminal; the bidirectional voltage limiting circuit is connected in parallel with the current input port and comprises a positive voltage limiting circuit and a negative voltage limiting circuit which are connected in parallel; the input negative electrode of the compensation unit is electrically connected with the dotted terminal of the primary coil, and the input positive electrode and the output end of the compensation unit are electrically connected with the synonym terminal of the primary coil. According to the invention, the amplitude of current impact on the sampling resistor can be obviously reduced, the damage caused by inconsistent measuring range is avoided, and the overall reliability of the alternating current measuring instrument is improved.

The invention discloses a soft start control method for an LLC resonant converter, and the method employs a voltage outer loop + primary power inner loop scheme, and achieves the limiting of an output current and the prevention of the overhigh output current under the working conditions of on-load starting or lower output voltage or dynamic load through the control of the power. By controlling the primary side power, the control on the primary side current can be realized, so that the suppression on the current of the resonant cavity is realized, and the current of the resonant cavity is prevented from being too large; a frequency limiting curve is introduced, the minimum switching frequency is limited according to the output voltage, and when the output voltage rises, the minimum switching frequency is lowered. And by limiting the minimum switching frequency, the output gain of the LLC is suppressed, so that the output current is suppressed.

The invention discloses an MPC-SP-based all-vanadium redox flow battery constant-power charging and discharging control method, which is applied to an energy storage control system composed of an MPC-SP controller, a PCS and an all-vanadium redox flow battery, and is characterized in that the controller dynamically and accurately adjusts the power output to the battery based on preset SOC interval division, and the power output to the battery is increased along with the increase of the actual SOC value of the battery. The power is increased in stages. Meanwhile, the controller pays attention to the voltage Ud of the battery end all the time, and when the Ud reaches a voltage limiting value, the constant voltage mode is switched, so that the battery is effectively prevented from being damaged due to overhigh voltage. The state-based dynamic power management is much safer, more flexible and more intelligent than traditional fixed constant power control. According to the invention, the change rate of current in the charge-discharge process of the all-vanadium redox flow battery can be reduced, the service life of the battery is prolonged, and the safety is guaranteed.

The invention discloses a half-bridge driving circuit and method in a multi-level topology based on an FPGA (Field Programmable Gate Array), the half-bridge driving circuit comprises an MCU (Microprogrammed Control Unit), an FPGA logic circuit and a signal isolation circuit, the FPGA logic circuit gathers fault signals of other circuits in a complete machine, when other circuits fail, the circuit is notified to carry out shutdown operation, and when the other circuits fail, the FPGA logic circuit does not fail, the signal isolation circuit does not fail. In the process of switching on to switching off and the process of switching off to switching on, a transition state that switching-on voltage and switching-off voltage are invalid exists in a period of time, impact in the state switching process is solved, soft switching-off of an outer tube and an inner tube of a power main device in the multi-level topology from outside to inside is achieved in case of a fault, and soft switching-off of the outer tube and the inner tube of the power main device in the multi-level topology is achieved. The gate driver has the advantages that the gate driver is simple in structure, combinational logic and complex sequential logic functions can be realized at low cost, the signal isolation circuit is used for controlling conversion and isolation of PWM (pulse-width modulation) pulse to voltage required by gate control signals of a power device of a main circuit, peak voltage limitation and inner and outer tube switching time sequences are realized, various faults can be monitored, and fault protection can be safely implemented.

A high power (HP) generator (10) and a method for delivering pulsed high power at high voltage and / or current values ​​to a capacitive load, in particular a plasma process, comprising: - several low power (LP) generators (14, 16, 18), each LP generator (14, 16, 18) includes an energy storage component (C1, L1), and in use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; each LP generator (14, 16, 18) when in use provides at its output an LP generator value corresponding to the value of an energy storage component (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18); Several low power (LP) generators (14, 16, 18); - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, At least one, preferably several and most preferably all LP generators (14, 16, 18) comprise an LP generator value limiting circuit (151), e.g. a voltage limiting circuit or a current limiting circuit.

The invention relates to the technical field of welding, and provides a low-load voltage circuit and a lithium battery welding machine. The circuit comprises a main control module, a voltage detection unit, a switching circuit, a pulse modulation unit and a current sampling feedback unit. The voltage detection unit monitors the end voltage of a welding gun of a welding machine in real time, the switching circuit limits the output voltage to be smaller than a safety threshold value of 36 V in a no-load mode, and a built-in bidirectional thyristor achieves isolation of a high-voltage loop and a low-voltage loop. The pulse modulation unit adjusts the on-off frequency of a main power loop, and the current sampling feedback unit dynamically adjusts the pulse duty ratio so as to accurately control the welding current. The lithium battery welding machine integrates the circuit and is provided with a welding gun assembly, a main transformer and a power supply module, the electric shock risk is effectively reduced, and the welding quality and efficiency are improved.

The invention discloses a current prediction control method based on a permanent magnet synchronous motor. A control system of the permanent magnet synchronous motor comprises a storage unit in which various parameter tables are preset; the control method comprises the following steps: performing temperature prediction according to current sampling data; dividing a temperature operation interval, judging the temperature operation interval according to the predicted temperature prediction value, and carrying out current amplitude limiting; unifying various temperature limiting amplitudes and voltage limiting amplitudes, establishing constraint conditions of the permanent magnet synchronous motor, and converting equality constraints into a target function through the constraint conditions; eliminating a voltage inequality constraint and a dynamic current inequality constraint in the target function; and finally, calculating to obtain a current reference value at the next moment, and processing the current reference value by the inner loop controller to output a switching signal to the inverter. The control system can adjust constraint conditions and objective functions on line according to actual working conditions such as temperature and motor parameter changes, and robust control over environment disturbance and non-linear influences is achieved.

Disclosed are a flyback switching power supply and a self-powered circuit and method therefor. The self-powered circuit includes: a charging capacitor configured to draw power from a primary coil and supply power to a switching power supply chip; a withstand voltage switch tube for acquiring a power supply voltage of the primary coil and outputting a charging voltage; a charging switch tube for controlling whether to charge the charging capacitor; an adjustment control tube for limiting the charging voltage of the charging capacitor; a voltage limiting control unit for controlling the conduction state of the adjustment control tube according to the charging voltage; a charging control unit preset with a charging requirement; and an inverter for acquiring the conduction switch signal and controlling the voltage limiting control unit or the charging control unit to be connected to the adjustment control tube according to the conduction switch signal.

The invention discloses a power switch MOS tube driving power supply protection circuit, and the circuit comprises a driving amplitude detection module which is used for sampling and monitoring the voltage swing of power switch MOS tube driving power supply in real time; the driving amplitude limiting module is configured to be used for limiting the voltage swing which is externally provided for driving and supplying power to the power switch MOS tube, so that the voltage swing does not exceed a preset threshold value; and the driving amplitude response module is used for receiving and processing the control signal of the driving amplitude detection module and outputting a feedback signal with loading capacity to the inside and the outside simultaneously. When the swing of the power supply voltage externally provided for the power switch MOS tube drive is unstable, the drive amplitude detection module is used for sampling and detecting the power supply voltage in real time, and then the drive amplitude response module is used for processing signals and feeding back whether the power supply information meets the protection action triggering requirement or not to the outside. And meanwhile, reasonable voltage limiting protection measures are implemented through the driving amplitude limiting module, so that the safe operation of the power switch MOS tube is ensured.

The invention discloses a direct-current solid-state circuit breaker with a voltage limiting protection circuit and a control method thereof. The direct-current solid-state circuit breaker comprises a solid-state switch module, the solid-state switch module comprises a first sub-module and a second sub-module which are the same, and each of the first sub-module and the second sub-module comprises a SiC JFET device J, capacitors C, Cgd and Cgs, a comparator U, an MOSFET device Q, a resistor Rg and resistors ra and rb; the first end of Rg is used for receiving a driving signal, and the second end of Rg is connected to the grid electrode of J after being connected with the first end of C, the second end of Cgd and the first end of Cgs; the second end of ra and the first end of rb are connected as a comparison voltage sampling point; the first end of ra is connected to the first end of Cgd and the drain electrode of J; the second end of the rb is connected to the second end of the Cgs, the source electrode of the Q and the source electrode of the J; the second end of C is connected to the drain electrode of Q; the output end of U is connected to the grid electrode of Q; the anode input of U is comparison voltage, and the cathode input is reference voltage; the source electrode of the first sub-module J is connected to the drain electrode of the second sub-module J.

Circuits and methods are provided for an input hysteresis buffer that includes a voltage limiting unit, a voltage detecting unit connected to the voltage limiting unit, and a supply tracking bias unit connected to the voltage detecting unit. The voltage liming unit comprises a first voltage limiting unit and a second voltage limiting unit. The voltage detecting unit comprises a first voltage detecting unit configured to detect the presence of a first threshold voltage in an input signal, and a second voltage detecting unit configured to detect the presence of a second threshold voltage in the input signal. The supply tracking bias unit is configured to supply a control signal to the voltage detecting unit.

The invention discloses a control method for limiting photovoltaic output voltage, current and power, relates to the technical field of photovoltaic converter control strategies, and solves the problems of overlarge photovoltaic output voltage and current, excessive power and overlarge output voltage of a converter under specific requirements. According to the technical scheme, the method is characterized in that control under an MPPT mode, a power limiting mode and a converter output voltage limiting mode is converted into control over inductive current, the minimum value is selected as an inductive current given value, and therefore automatic switching under all the modes is achieved; wherein the power limiting mode can limit the photovoltaic output power according to the frequency change of the power grid to realize the primary frequency modulation of the power grid; and an MPPT restarting strategy is provided for solving the problem that the system cannot recover the MPPT mode due to sudden change of the power of the photovoltaic panel, so that the power of the system cannot be continuously tracked.

The invention belongs to the technical field of flexible macro-micro drive motion system preset output tracking control, and particularly relates to a flexible macro-micro drive motion system preset output tracking control method based on active disturbance rejection, which specifically aims to estimate and compensate multi-modal vibration caused by a flexible hinge, an elastic structure and the like in real time through a linear extended state observer (LESO); the influence of high-frequency resonance on the system stability is reduced; an anti-saturation compensator is introduced to dynamically adjust the control quantity, the output saturation problem of the piezoelectric stack caused by input voltage amplitude limiting is avoided, and the physical realizability of a control instruction is ensured; and in combination with a preset performance function and a dynamic surface method, a tracking controller giving consideration to both transient response and steady-state precision is designed, and meanwhile, an LMI optimization control distribution strategy is utilized to coordinate the cooperative action of a macro-micro actuator under saturation constraint, so that the uncertainty of the system to the model and the robustness of the system to external disturbance are enhanced.

An adapter for introduction into a two-conductor line comprises an adapter housing; and, arranged in the adapter housing, an adapter electronics that connects a first terminal with a third terminal using a first connecting line and a second terminal with a fourth terminal using a second connecting line, wherein the adapter electronics further includes an overvoltage protection system designed to limit a voltage applied across the third and fourth terminals to a first maximum value in the event of failure; an overcurrent protection system adapted to prevent a rise of the loop current above a maximum electrical current value in the event of failure; and a circuit adapted in the non-failure case to control a voltage applied to the overvoltage protection system, from a minimum input voltage, to a second maximum value lower than the first maximum value.

The invention discloses a permanent magnet synchronous motor current control device and method. The current control device comprises a feedback control module, a feed-forward compensation module and an optimal amplitude limiting module. The feedback control module comprises an adder, a current instruction filter, a proportional-integral controller and an anti-saturation controller. And the feed-forward compensation module is used for compensating counter electromotive forces of a direct axis and a quadrature axis of the motor to improve the current response performance. And the optimal amplitude limiting module calculates an optimal quadrature-axis voltage amplitude limiting value according to the current rotor position and performs amplitude limiting, and calculates a voltage saturation value for resisting saturation at the same time. According to the current control device, a current loop optimal amplitude limiting and anti-saturation method is provided, the problems that a proportional-integral current loop control structure is long in adjustment time, integral is easy to saturate, and stability is reduced after amplitude limiting are solved, and the stability and the optimal control performance of a control system can be guaranteed under different working conditions.

A method for detecting an insulation fault in a vehicle on-board electrical system having an HV and LV on-board electrical system branches. The LV branch has at least one first LV potential and a second LV potential that differs therefrom and corresponds to a ground potential of the vehicle on-board electrical system. The HV branch has positive HV negative HV potentials. These HV potentials are DC-isolated from the LV branch potentials. An insulation fault between at least one of the HV potentials and the first LV potential is detected by identifying a current flow. The current flow runs through a voltage limiting circuit connected between the ground potential and the first LV potential. This circuit connects the first LV potential, via a plurality of diodes, to a voltage limiting element connected to the ground potential of the vehicle on-board electrical system. A vehicle overvoltage protective circuit is also described.

The invention discloses a grid-connected distributed photovoltaic inverter control method and system. The method comprises the following steps: selecting a first control object, and establishing a first controller based on the first control object; establishing a first equivalent control signal, and updating the first controller based on the first equivalent control signal to obtain a second controller; and controlling the grid-connected distributed photovoltaic inverter according to the second controller. Through the control method, the power grid operation state change when the voltage of the power grid drops can be effectively handled, and the stability and reliability of the grid-connected distributed photovoltaic inverter are improved. When the voltage of the power grid drops, the voltage of the direct current link capacitor is kept constant, so that the voltage of the direct current link can be prevented from exceeding the voltage limit of the capacitor, and the off-network phenomenon caused by triggering the protection device is avoided.

The invention relates to the technical field of transformer area intelligent monitoring and management, in particular to a method, device and system for regulating and controlling voltage in a transformer area based on multiple agents and a chip. The system comprises a voltage regulation and control center, and a voltage regulation and control unit and an energy control node in a transformer area. And the voltage regulation and control center predicts future load and energy output of the transformer area by using the first intelligent agent, and generates a transformer area collaborative voltage regulation and control scheme in combination with the second intelligent agent. And the voltage regulation and control unit generates a specific voltage regulation and control scheme in the transformer area through a third agent according to the transformer area collaborative voltage regulation and control scheme and the real-time load information, and issues the specific voltage regulation and control scheme to the energy control node to execute voltage regulation and control. Through cooperative work of the intelligent agents, fine voltage regulation and control of the photovoltaic grid-connected point are effectively realized, voltage out-of-limit of the photovoltaic grid-connected point is avoided, voltage stability and electric energy quality of the power distribution network are improved, and powerful technical support is provided for access of renewable energy sources and intelligent operation of the power distribution network.