59results about How to "Improve voltage stability" patented technology

The invention belongs to the technical field of power electronic systems, and discloses a distributed photovoltaic cluster modeling method and system based on an improved FCM algorithm, and the method comprises the steps: measuring the outlet voltage Vt of a photovoltaic unit, the voltage VPCC of a PCC point, and the phase angle difference theta between the two, deducing a calculation formula of an equivalent electrical distance from the outlet of the photovoltaic unit to the PCC point under a radiation type structure, and calculating the equivalent electrical distance between the outlet of the photovoltaic unit and the PCC point; calculating an equivalent electrical distance under a chain structure and a complex network topology structure, and calculating a line impedance equivalent coefficient; measuring an active power P, a reactive power Q and a port voltage Vt output by the photovoltaic unit, and proposing an index value representing a photovoltaic voltage support function; an equivalent electrical distance, a photovoltaic capacity and a voltage support function are comprehensively considered, and a comprehensive clustering index accurately representing the characteristics of the distributed photovoltaic power generation system is established; an optimal solution obtained through a particle swarm clustering algorithm is used as an initial clustering center, an optimal clustering result is calculated through an FCM algorithm, and an equivalent model is calculated through parameter equivalence;

The utility model discloses a low fluctuation power supply parallel operation equipment, including n power supply modules and load connection terminal, each power supply module includes user input, power conversion, acquisition, CAN communication module and MCU module, the power supply interface of each power supply module is connected with the load connection terminal through a flexible wire, and the power supply modules are in communication connection through a CAN bus. One of the n power supply modules is set as a host, the other power supply modules are set as slaves, and each power supply module adjusts output voltage to enable the voltage to be equal to Vset and collects real-time current data; the slave computer transmits data to the host computer, the host computer receives the data, calculates a current sharing reference and sends the current sharing reference to the slave computer through a bus, and each power supply module calculates and obtains a new voltage stabilization value Vnew according to the current sharing reference and a set Vset. Compared with the prior art, the utility model has the advantages of reducing system oscillation, improving voltage stability and reducing equipment cost.

The invention discloses a voltage regulation and peak demand control method based on deep learning, and relates to the technical field of power distribution networks, and the method comprises the steps: S1, building a power distribution system model, a photovoltaic inverter model and an energy storage model, and expressing the coordination control of a photovoltaic inverter and energy storage as an optimal power flow problem; s2, establishing a deep reinforcement learning framework; and S3, solving a multi-objective optimization problem in voltage regulation and peak load management by using a soft behavior-criticality algorithm, and designing two different reward functions for daytime and nighttime. According to the voltage regulation and peak demand control method based on deep learning, by coordinating control strategies of a photovoltaic inverter and a battery energy storage system, the problems of voltage overrun and peak load caused by photovoltaic power generation fluctuation and load change in a power distribution network are effectively solved, and the algorithm is improved through a two-stage deep reinforcement learning control framework. The dynamic coordination control of the photovoltaic inverter and the battery energy storage system is realized.

The invention belongs to the technical field of organic photoelectric materials and devices, and discloses an organic electroluminescent device, a preparation method thereof and a display device. The device sequentially comprises an anode layer, a hole transport layer, a light-emitting layer, a second electron transport layer, a first electron transport layer and a cathode layer, wherein the first electron transport layer is composed of an n-type dopant and a first electron transport material. According to the adopted electron transmission structure, small electron injection barriers are arranged between the second electron transmission layer and the first electron transmission layer and between the second electron transmission layer and the main body material, and the organic light-emitting device prepared through the electron transmission structure achieves good voltage stability in the aging process; therefore, the problem of power consumption increase of the organic light-emitting device in the aging process is solved. And a relatively small electron injection barrier can reduce the driving voltage of the device, so that the organic light-emitting device with low driving voltage, long service life and stable voltage is obtained.

The invention discloses a local control method and system for a target photovoltaic inverter to participate in voltage regulation of a photovoltaic grid-connected point. The method comprises the following steps: acquiring related parameters of the target photovoltaic inverter participating in the voltage regulation of the photovoltaic grid-connected point; voltage acquisition is carried out on different nodes of the photovoltaic grid-connected points, and whether voltage out-of-limit occurs at different nodes of all the photovoltaic grid-connected points is judged; if voltage out-of-limit occurs to a node in a certain photovoltaic grid-connected point, the node controls a target photovoltaic inverter to adjust the voltage value of the node of the photovoltaic grid-connected point according to a voltage control strategy; and synchronizing the adjusted voltage value of the node of the photovoltaic grid-connected point to the other connected photovoltaic grid-connected points, and performing voltage adjustment on the other connected photovoltaic grid-connected points through a voltage control strategy until voltage adjustment of all the photovoltaic grid-connected points is completed. According to the invention, rapid and accurate voltage regulation can be realized, the voltage stability of a photovoltaic grid-connected point is improved, the impact on a power grid is reduced, and the overall efficiency of a photovoltaic system is improved.

The invention relates to the technical field of high-frequency line tests, and discloses a high-frequency line test tower for a computing power server and a test method thereof.The high-frequency line test tower comprises a distribution box, an experiment installation base is fixedly installed on one side of the distribution box, and experiment installation boxes are movably installed on the top of the experiment installation base; and wired detection boxes are mounted on one sides of the experiment mounting boxes in a penetrating manner. A plurality of test box mounting bolts penetrate through a test box connecting plate in a threaded mode to enable a plurality of test box mounting boxes to be vertically mounted, then test box fastening gaskets and test box fastening nuts are used for being mounted at the bottoms of the test box mounting bolts in a threaded mode, and then a line detection box and a line detection hole are used for facilitating penetrating detection of a high-frequency line. The high-frequency line detection equipment can be modularly mounted and used, so that the high-frequency line detection equipment can resist wind during mounting, the mounting stability of the high-frequency line detection equipment is improved, and the moving convenience of the high-frequency line detection equipment is improved.

The invention discloses a sulfide composite electrolyte as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries, an organic coating agent and an organic solvent are mixed, oxide nanoparticles are dispersed in the mixture, a precipitate is extracted and dried to obtain an oxide-organic coating agent composite material, then the oxide-organic coating agent composite material is subjected to ball milling treatment in the sulfide electrolyte, and the sulfide composite electrolyte is obtained. The sulfide composite electrolyte solves the problems of lithium dendrites and self discharge existing in a sulfide all-solid-state battery, the prepared sulfide composite electrolyte can smoothly transmit lithium ions, meanwhile, electron transfer between sulfide electrolyte interfaces is blocked, the electron conductivity is reduced, and the service life of the sulfide all-solid-state battery is prolonged. The growth of lithium dendrites along gaps of sulfide electrolyte is favorably inhibited, and the problem of lithium dendrites in a solid-state battery can be reduced. The preparation method provided by the invention is simple in process, low in equipment requirement and easy to amplify.

The invention discloses a receiving end power grid direct current drop point strong correlation pumped storage unit selection method, which comprises the following steps of: proposing reactive voltage indexes of a pumped storage unit and a direct current inverter bus from three dimensions of pumped storage unit grid-connected point system strength, direct current drop point system strength and an electrical distance between the pumped storage unit and a direct current drop point; the relative gain matrix is utilized to establish strong correlation pumped storage unit constraints of the direct current inverter bus, the maximum reactive power support of the pumped storage unit to the direct current inverter bus is taken as a target, a direct current drop point strong correlation pumped storage unit optimal selection model is established, and finally a direct current drop point strong correlation pumped storage unit selection optimization result is obtained. The result can effectively utilize the phase modulation capability of the pumped storage unit to ensure the safe and stable operation of the receiving-end power grid, effectively improve the reactive operation characteristics of the East China power grid, improve the system strength and voltage stability, and provide reference for the planned operation of the direct-current feed-in receiving-end power grid.

The invention provides a low-voltage flexible interconnection regulation and control method and device for a power distribution network, and the method comprises the steps: obtaining the characteristics and parameters of regulation and control equipment of a power distribution system, and building various equipment models according to the characteristics and parameters, including an on-load voltage regulation transformer model, an electric vehicle charging and discharging model and a renewable energy model; obtaining seasonal load data and transformer use capacity data according to various equipment models; establishing a low-voltage flexible interconnection model of the power distribution network according to the seasonal load data and the transformer use capacity data; establishing a power distribution network low-voltage flexible interconnection regulation and control model oriented to new energy consumption and seasonal load supply based on various equipment models and the power distribution network low-voltage flexible interconnection model; and determining a new energy power distribution system interconnection regulation and control optimization strategy based on the power distribution network low-voltage flexible interconnection regulation and control model and the on-load voltage regulation transformer model. In this way, the new energy consumption capability can be improved while the seasonal load requirement of the new energy power distribution network can be met.

The invention relates to the technical field of power supply and distribution supervision, and particularly discloses a power supply and distribution supervision system based on data processing, which comprises a distributed node module, an operation data analysis module, a fault diagnosis analysis module and a performance optimization supervision module. A power supply and distribution system is divided into a plurality of supervision nodes through a distributed node module, operation parameters of each node in each supervision period can be monitored and counted in real time, and a basic operation state coefficient is comprehensively calculated by calculating voltage, current, power factor and power volatility and a normalization value and combining a set adjustment coefficient. Therefore, the operation state of each supervision node in each supervision period can be accurately mastered, factors such as the parameter average value, the volatility and the rated value are comprehensively considered, the operation condition of the system is evaluated more accurately, abnormity can be found in time, and a powerful basis is provided for optimizing operation of a power supply and distribution system, improving the power supply quality and reducing faults and energy waste.

The application discloses a kind of regulation and control method and device of broadband resonance damping characteristics, the method includes that target node in electric power system is sampled to broadband signal, target voltage instantaneous distortion and target current cumulative deviation are obtained, to calculate energy transmission delay factor and energy balance correction factor;According to energy transmission delay factor and energy balance correction factor, calculate local damping dynamic coefficient and control accuracy real-time error, to optimize target voltage instantaneous distortion and target current cumulative deviation;According to the target voltage instantaneous distortion and target current cumulative deviation after optimization, and local damping dynamic coefficient updates power flow distribution proportion, to improve the voltage stability of target node.Can be through energy transmission delay factor and balance correction factor quantitative analysis the transient characteristics of energy change of electric field and magnetic field;According to the transient characteristics in combination with the real-time running state of electric power system, regulate and control broadband resonance damping characteristics, to improve the stability of electric power system.

The embodiment of the invention provides a method and equipment for determining a power system configuration scheme and a medium. The method comprises the following steps: determining the initial inertia of a system; if the initial inertia of the system is smaller than the inertia demand value, the reactive response capability of each new energy node is calculated, and a first node is determined; if the first node is different from the previous configuration scheme, taking a new energy node of which the short-circuit ratio is smaller than a short-circuit ratio threshold value as a second node after simulating to carry out network construction type transformation on the first node; determining a current configuration scheme and a corresponding configuration cost; after the second node is simulated to be subjected to synchronous phase modifier configuration, the initial inertia of the system is determined again, and the step of judging whether the initial inertia of the system is larger than or equal to the inertia demand value or not is executed again; and if the first node is the same as the previous configuration scheme, selecting the scheme with the lowest configuration cost. According to the scheme, various configuration schemes of the new energy power system can be determined, the scheme with the lowest cost is selected as the target configuration scheme, and the economical efficiency of system transformation is guaranteed.

The invention provides a composite gel electrolyte membrane, a preparation method thereof and a secondary battery. The preparation method comprises the following steps: carrying out modification treatment on solid electrolyte particles, preparing the solid electrolyte particles into suspension liquid, preparing the suspension liquid into single-orientation aerogel, carrying out low-temperature sintering, grinding a low-temperature sintering product into particles, so as to obtain modified solid electrolyte particles which are uniformly dispersed in particle size and uniform in components, and preparing the solid electrolyte composite material by taking a polymer as a base material. A porous composite solid electrolyte membrane is prepared by taking modified solid electrolyte particles as a dispersion material, an electrolyte is dropwise added to realize swelling, a composite gel electrolyte membrane is prepared, a battery assembled by the prepared composite gel electrolyte membrane shows better rapid charge and discharge performance, and the voltage stability and the cycle performance are also improved.

This invention proposes an adaptive virtual impedance droop control method, system, device, and medium, relating to the field of droop control. The method includes: calculating the standardized reactive power of each local node and neighboring node based on the equivalent output impedance and reactive power droop coefficient; generating a correction amount for the virtual impedance based on the accelerated consensus algorithm and the standardized reactive power of each local node and neighboring node; adjusting the virtual impedance in the distributed grid topology according to the correction amount of the virtual impedance to obtain the adjusted dynamic virtual impedance; calculating the virtual impedance voltage drop based on the adjusted dynamic virtual impedance; calculating the feedforward compensation voltage reference value; calculating the common compensation amount of the preset virtual leader node and the local compensation amount of each local node and neighboring node to obtain the total voltage compensation command; adjusting the feedforward compensation voltage reference value according to the total voltage compensation command to obtain a voltage stabilization scheme, using the dynamic virtual impedance as the power distribution scheme.

This invention discloses an optimized scheduling method for virtual power plants with multiple resource types, belonging to the field of virtual power plant technology. This method aims to solve the technical challenges of delayed scheduling response due to the strong volatility of distributed resource output, insufficient adaptability to multiple scenarios, and weak distribution network resilience under renewable energy access. The method establishes a multi-resource power adjustable range model based on real-time data, uses linear scaling and displacement algorithms to generate aggregated power domain boundaries, and adjusts the weights according to the different target types of the virtual power plant. It combines ridge regression conditional expectation correction and sub-Bruker optimization to construct a dynamic risk budget, optimizing generation plans and reserve capacity in the day-ahead phase. In the real-time phase, it responds in stages according to power deviation levels, triggering rapid energy storage compensation or emergency interruption of controllable loads. The model parameters are iteratively corrected through a closed-loop feedback mechanism. This method significantly improves the response accuracy and reliability of virtual power plants in frequency regulation, peak shaving, and self-balancing scenarios.

The invention relates to the technical field of asynchronous power generation, and discloses an asynchronous power generation system reactive compensation capacity determination method, which comprises the following steps: acquiring each asynchronous generator in an asynchronous power generation system and generator basic information and transformer substation basic information corresponding to a network access transformer substation corresponding to the asynchronous generator; reactive power compensation capacity required by each asynchronous generator and reactive power compensation capacity required by a network access substation are calculated; according to the distance between each asynchronous generator and the corresponding network access substation, determining a planning path corresponding to a power transmission line connecting the asynchronous generator and the network access substation, and according to the planning path corresponding to the power transmission line, calculating reactive compensation capacity required by the power transmission line; and calculating the reactive compensation total capacity corresponding to the asynchronous power generation system based on a preset compensation total capacity calculation formula.

The invention provides a new energy unit transient stability optimization method and system based on active feed-forward, and belongs to the field of new energy power generation. The system includes a current command generator and a current controller. The method comprises the steps of collecting terminal voltage and current of a unit, calculating active power and detecting a transient fault; when a fault is detected, generating an active current instruction through active feed-forward control based on power grid voltage information obtained by an active power signal, a fault voltage amplitude signal and phase locking; meanwhile, a reactive current instruction is generated; a current reference instruction is synthesized, and a converter is driven through closed-loop control to provide power support. According to the method, an active feed-forward mechanism is introduced, so that the new energy unit can respond to the power shortage of the power grid in advance, active and reactive support is quickly provided, frequency drop and power oscillation in the transient process are effectively inhibited, and the transient stability of the power system under the access of high-proportion new energy is remarkably improved.

The embodiment of the invention provides a power supply circuit and electronic equipment, relates to the technical field of control circuits, and is used for solving the technical problems that a double-battery power supply circuit is low in stability and complex in circuit. Each sub power supply circuit comprises two battery modules, a processing module and a switch module corresponding to each battery module. The output end of the battery module is respectively connected with one end of the corresponding switch module and one end of the processing module, the other end of the switch module is connected with a load, and the other end of the processing module is connected with the control end of the switch module. And the processing module is used for controlling the switch module of one battery module to be closed or the switch modules of the two battery modules to be closed according to the voltage difference between the battery modules so as to supply power to the load.

The utility model provides an intelligent robot emergency stop circuit, including power supply, emergency stop trigger source module is used for triggering emergency stop signal, emergency stop trigger source module includes at least one emergency stop button and at least one anti -collision strip sensor interface, and emergency stop button, anti -collision strip sensor interface are connected with power supply, a plurality of signal processing modules, and each signal processing module includes first photoelectric coupler, and the input of first photoelectric coupler is connected with emergency stop button or anti -collision strip sensor interface, and the output is connected with MCU, self -locking control module respectively, self -locking control module includes self -locking circuit, and the input of self -locking circuit is connected with a plurality of signal processing modules respectively, and the output is connected with motor control module, and motor control module is used for receiving the emergency stop signal of handled and control motor stop movement, the utility model has realized the effective integration to multiple emergency stop signal source, and its self -locking function can maintain the emergency stop state automatically after triggering.

The present invention relates to the field of energy storage technology, and specifically to a seismic station energy storage system based on retired vehicle-mounted power batteries, including a retired battery module, an energy management module, an energy conversion module, an electric energy storage module, a fault warning module and a user interface module; wherein: the retired battery module: is used to collect multiple retired vehicle-mounted power batteries, and integrate them in a series-parallel combination; the energy management module: is used to monitor the retired battery module in real time; the energy conversion module: is used to convert direct current into alternating current; the electric energy storage module: is used to store excess electric energy; the fault warning module: is used to analyze potential fault risks; the user interface module: is used to display the status information of each module. The present invention, through efficient integration of batteries, real-time monitoring of status and intelligent energy management, not only improves the stability and safety of the power supply, but also effectively extends the service life of the battery, and realizes the maximum utilization of resources.

The application discloses a DC-fed receiving-end power grid reactive power distribution method, electronic equipment and a medium, and the method comprises the following steps: obtaining the electrical distance between the substation node in the DC preset range and the DC; sorting the multiple substation nodes in the order from small to large according to the electrical distance, and constructing a reactive power configuration node set to be evaluated for reactive power configuration; calculating and obtaining a reactive power optimization distribution vector based on the reactive power configuration node set; and performing reactive power optimization distribution based on the reactive power gap value under the DC feeding fault and the reactive power optimization distribution vector. The application can ensure that each node can quickly adjust the reactive power output according to the requirements of the optimization distribution vector, fill the reactive power gap, improve the reactive power balance capability and voltage stability of the system under the DC feeding fault, and guarantee the safe and stable operation of the power system by combining the reactive power configuration node set and the reactive power optimization distribution vector to formulate a specific reactive power optimization distribution scheme.

The application discloses a vehicle collision redundancy unlocking system, method and vehicle, and belongs to the technical field of vehicle control. The system comprises a redundancy power supply unit and a driving module. The redundancy power supply unit is used for supplying power to a vehicle body control module, a main power supply unit and a door lock motor of the vehicle when the vehicle is in collision. The driving module is used for controlling the redundancy power supply unit to disconnect with the main power supply unit according to the whole vehicle power supply loop state of the vehicle when the vehicle is in collision, so that the redundancy power supply unit is effectively isolated from an external power grid, the negative influence of the external power grid on the voltage of the redundancy power supply unit is reduced, the voltage stability of the redundancy power supply unit is improved, and the door lock motor is controlled according to the door control state of the vehicle body control module, so that the door is directly driven to be unlocked when the vehicle body control module cannot unlock the door, thereby ensuring that the door is smoothly unlocked after the vehicle is in collision, and the redundancy unlocking precision of the door is improved.

The invention discloses vanadium-based borate particles, a preparation method thereof and an aqueous zinc ion battery. The vanadium-based borate particle has a core-shell structure, the core comprises vanadium borate and trivanadium borate, and the shell comprises boric acid and a conductive carbon material. The preparation method of the vanadium-based borate particles comprises the following steps: carrying out chelation reaction on a vanadium source, a boric acid source and an organic chelating agent to prepare a chelate, pre-sintering, and sintering in a reducing atmosphere. The vanadium-based borate particles have the advantages of high zinc ion diffusion speed, high electron transport capacity, good chemical and electrochemical stability, good compatibility with aqueous electrolyte, simple preparation method, short preparation time, low production cost and wide application prospect. And the aqueous zinc ion battery prepared by using the composite material as the positive electrode material has the advantages of high working voltage, large capacity, high energy density, excellent rate capability and excellent cycle performance, and is suitable for large-scale industrial production and application.

This invention relates to the field of power grid control technology, specifically providing a method, device, and medium for coordinated voltage control of a photovoltaic-storage system. The method includes: acquiring the state parameters of the photovoltaic-storage system; constructing a multi-dimensional evaluation index system based on the state parameters; wherein the multi-dimensional evaluation index system integrates voltage disturbance, reactive power sensitivity, and regulation cost; establishing a voltage coordinated control strategy generation model that integrates the state parameters and the multi-dimensional evaluation index system based on graph attention mechanism and physical constraints; and generating reactive power allocation instructions for each regulation unit of the photovoltaic-storage system using the trained voltage coordinated control strategy generation model. This invention performs task-oriented reactive power allocation based on the differentiated characteristics of various types of energy storage, fully leveraging the regulation potential of various resources, effectively solving the voltage stability problem in scenarios where a high proportion of distributed photovoltaic power is connected to a weak power grid, and significantly improving power supply reliability and power quality.

The application discloses a network-constructing energy storage coordinated control method for supporting grid voltage stability, and steps are as follows: real-time acquisition of state information and network-constructing energy storage output current; when the network-constructing energy storage output current does not reach an overcurrent limiting threshold, the network-constructing energy storage is controlled to adopt a constant voltage amplitude operation mode, the voltage amplitude of a node connected with the network-constructing energy storage is maintained to be equal to a reference value, so that a P-V characteristic curve of a load side is reshaped, the maximum transferable power of the load side is improved, and a static voltage stability margin is increased; when overcurrent occurs in the network-constructing energy storage, the network-constructing energy storage is switched to an overcurrent operation mode, in which mode, the network-constructing energy storage output active power and reactive power are distributed according to the ratio of line resistance to reactance between a grid node and a node connected with the network-constructing energy storage; and when the network-constructing energy storage output current falls below a preset recovery threshold, the constant voltage amplitude operation mode is restored. The application can improve the static voltage stability limit of a load node and the continuous voltage support capability of energy storage to the load under an overcurrent condition.

The invention discloses a fractional order sliding mode controller optimization design method for improving the transient voltage stability of a power grid, and the method comprises the steps: firstly designing an additional voltage controller based on a fractional order sliding mode theory, and then carrying out the recognition of a discrete z function expression of a system through combining with a least square criterion; and finally, based on the designed transfer function of the additional voltage controller and the discrete z function, establishing a parameter optimization model of the additional voltage controller. On the basis, iterative optimization is carried out in combination with a reinforcement learning algorithm, so that a parameter self-adjustment strategy of the fractional order sliding mode controller is obtained, adaptive updating of controller parameters under different working conditions is realized, and the fractional order sliding mode controller can play a good voltage control effect under different working conditions; and the system voltage stability under variable working conditions is enhanced.

The invention belongs to the technical field of power systems, and discloses a new energy equipment control parameter optimization method and system. The new energy equipment control parameter optimization method comprises the following steps: establishing a full-system quasi-steady-state model based on time scale separation; based on the whole system quasi-steady-state model and the power flow information, performing preset fault quasi-steady-state calculation to obtain a new energy unit state and a direct current system state; and based on the whole-system quasi-steady-state model, the state of the new energy unit and the state of the direct-current system, carrying out gradient calculation on a transient overvoltage value at a preset fault clearing moment relative to a new energy control parameter, and obtaining a new energy equipment control parameter which is most beneficial to voltage stability by utilizing a gradient descent method. According to the method, the new energy equipment control parameters in the power system are optimized based on the gradient of the transient overvoltage value at the preset fault removal moment relative to the new energy control parameters, and the purpose of improving the voltage stability of the power system can be achieved.

The application discloses a voltage division offset compensation control circuit and a voltage division offset compensation method. The voltage division offset compensation control circuit comprises: a voltage stabilizing circuit, which is used for sampling an output voltage VO to form a feedback voltage signal, comparing the feedback voltage signal with a reference voltage VREF, and generating an adjustment control signal to adjust the output voltage VO. A compensation circuit is connected with a feedback node of the voltage stabilizing circuit, used for generating a compensation current IX based on the change of the output voltage VO, and injecting the compensation current IX into the feedback node of the voltage stabilizing circuit to offset the voltage division offset caused by the change of the output voltage VO, so that the feedback signal maintains a constant voltage division ratio under different output voltages. The application can eliminate the resistance voltage division error caused by the change of the output voltage in the voltage stabilizing circuit, and ensure the high-precision output of the voltage stabilizing circuit.

This invention relates to the field of electrochemical energy storage technology, specifically to a lithium manganese iron phosphate-nickel cobalt manganese system semi-solid-state battery and its preparation method. The semi-solid-state battery includes a composite positive electrode, a negative electrode, and a semi-solid electrolyte membrane. The composite positive electrode includes an aluminum foil current collector and a positive electrode active material layer coated on its surface. The positive electrode active material layer is a mixture of zirconium-fluorine co-doped lithium manganese iron phosphate and magnesium-doped nickel cobalt manganese ternary materials. This invention significantly improves the overall electrochemical performance of the battery through the synergistic design of a composite positive electrode material system with specific element doping, a three-dimensional conductive network structure of the negative electrode, and a composite semi-solid electrolyte. It is suitable for applications with stringent requirements for safety, low-temperature adaptability, and energy density. The preparation method is compatible with existing lithium-ion battery production lines, requires no additional complex equipment, and has good industrialization feasibility.

The invention provides a network construction type energy storage locating and sizing method considering the voltage stability improvement of a receiving end power grid, and belongs to the technical field of network construction type energy storage planning. The method comprises the following steps: constructing a receiving end power grid total factor simulation model; constructing an optimization model taking the minimization of the total investment cost of the constructed network type energy storage as a target function; constructing constraint conditions of the optimization model according to a small disturbance voltage stability margin constraint, a large disturbance voltage recovery characteristic constraint, and a site selection constraint and a capacity constraint of network construction type energy storage; performing linearization processing on nonlinear terms in the optimization model by using a support function relaxation algorithm; solving the optimization model, obtaining a site selection result and a capacity result of the network construction type energy storage, and checking a relaxation error; and verifying the site selection result and the capacity result by using the simulation model, and if the voltage stability of the receiving-end power grid does not meet a preset requirement, adjusting parameters of the optimization model, and performing solution again. The method can accurately quantify the improvement effect of the network construction type energy storage on the voltage stability of the receiving end power grid.