233 results about "Voltage optimisation" patented technology

The invention discloses a reactive optimization method for a distribution network. The method comprises the following steps: firstly, building an actual operation model of the distribution network, then conducting load flow calculation, analyzing the voltage quality, applying a reactive optimization administrative tool to formulate a reactive optimization scheme, adopting the simulated analysis method to examine and regulate the appointed optimization scheme, and finally achieving reactive optimization of the distribution network according to the regulated reactive optimization scheme. The invention also discloses a reactive voltage optimization system for the distribution network, which corresponds to the method. The method and the system solve the difficult reactive optimization problem of the distribution network and provide theoretical foundation and decision support for planning, operation, reconstruction and management of the whole distribution network.

The invention relates to a 3D-coordinated power grid energy management system and a power grid evaluation and control method, which belongs to the field of scheduling automation of power system. The system comprises a power grid model reconstruction sub-system, a power grid safety evaluation and alarm sub-system, an active frequency optimization control sub-system and a passive voltage optimization control sub-system, and a background calculation sub-system and a system foreground. The method comprises following steps: tracking isoline of an external power grid and automatically reconstructing a global power grid model; automatically executing online safety analysis integrated with static power grid, dynamic power grid, voltage stabilization, coordination of relay protection setting values, etc., and online recognizing the safety state of the power grid; alarming for normal unsafe condition, and carrying out prevention control; alarming for emergent conditions, and carrying out correction control calculation; and carrying out realtime active scheduling closed-loop control and passive voltage optimized closed-loop control under normal safety condition. The invention can achieve comprehensive and coordinated closed-loop control for the safety of the power grid, the economy and the electric energy quality.

In a wireless network comprising access points deployed within a designated zone of coverage, the radio frequency field strength resulting from radiation from the access points is optimised as a function of location by means of control of the transmission power and/or radiation pattern of the access points in response to measurements from sensors at defined locations that measure received signal power, the received power being related to radio frequency field strength. Sensors may be deployed within the designated zone of coverage, at the edge of the zone and/or outside the zone and optimisation of the transmission parameters of the access points in terms of transmission power and/or radiation pattern is carried out taking into account the location of the sensors in addition to the received power at the sensors.

The invention provides a transmission and distribution coordinated distribution type reactive voltage optimizing method, and belongs to the technical field of electrical power system operation and control. The method comprises the following steps: constructing a transmission and distribution combined reactive optimal model formed by a target function and a constraint condition by comprehensively taking the coupling relationship among a transmission network model, a distribution network model and transmission-and-distribution into consideration; then, performing second-order cone relaxation on a non-convex constraint of a distribution network, and converting the non-convex constraint into convex constraint; solving the model by applying an improved generalized Benders decomposition method. The method only needs to interact a small amount of information between the transmission network and the distribution network, has an excellent convergence speed, ensures the scheduling and controlling independence of transmission and distribution, can be used for solving the problems of overvoltage, power dismatching and the like caused by a traditional transmission and distribution independent reactive optimizing method, and can achieve optimal loss of the whole local network.

The invention provides a method of optimal control of wind power plant reactive voltage. On the premise of guaranteeing the safe running of a wind power plant by effectively utilizing multiple reactive devices and voltage regulating measures in the wind power plant, quick response is carried out on the voltage instructions of the wind power plant given by a scheduling mechanism. The optimal control model of the reactive voltage of the wind power plant is built with the maximum reactive margin of the reactive devices in the wind power plant and the highest stable level of machine end voltage of a wind turbine generator as a comprehensive aim and with voltage constraints of the combined network point of the wind power plant, the balance constraints of the active power and reactive power of a node and the constraints of the top limitation and the bottom limitation of a variable and the like as constraint conditions, solution is carried out by using an optimization algorithm, the obtained optimal control instructions of the reactive power of the wind power plant are given to various reactive devices in the wind power plant to execute. The method of the optimal control of the wind power plant reactive voltage harmonizes various reactive device with adjustable high speed and low speed in the wind power plant, the reactive power of the combined network point meets scheduling instructions, meanwhile the reactive margin in the wind power plant is enabled to be maximum, the voltage stable level in the wind power plant is enabled to be highest, and transmission losses are reduced.

The invention provides a control method for improving reliability of an AVC (Automatic Voltage Control) system of an electric power monitoring center. The control method comprises the steps of performing real-time telemetry data processing; performing real-time remote signaling data processing and dead data processing; and determining the data as dead data, locking a corresponding reactive voltage regulating device and sending alarm signals when the AVC system detects that telemetry information is not refreshed for a long time. The control method for improving the reliability of the AVC system of the electric power monitoring center has the advantages of achieving optimal control and closed loop operation of reactive voltage of the integral grid due to the fact that centralized monitoring, unified management and online control are performed on an on-load voltage regulating device and a reactive compensation device of every power substation in a power grid and ensuring that the AVC system enables a voltage reactive control strategy to be optimized, reducing the times of once action of the reactive voltage regulating device, improving the service life of the device and providing the corresponding technical support for improvement of the reactive voltage management level and safe, stable and high quality operation of the integral power grid due to the fact that the AVC system still relies on real-time data collected through an SCADA (Supervisory Control And Data Acquisition) system to calculate to a great extent.

The invention relates to a regional power grid economic operation and energy saving total management system which comprises three layers of structures. The bottom layer is an interface module, the middle layer is a foundation platform module, and a high-level layer is a function application layer. The interface module achieves image equipment and topological data reading to the system and a database timed task function. The middle layer supports power grid visualization graphic modeling and universal tool service functions. The high-level layer achieves a complete set of regional power grid economic operation analysis and energy saving total management functions and an auxiliary-implemented working process. The system mainly has five application functions, namely long-term load prediction, transformer economic operation, power quality analyzing, transmission loss managing and reactive voltage optimal controlling.

The embodiment of the application discloses an AVC (Automatic Voltage Control) system-based reactive voltage optimization method. The method comprises the following steps of: receiving a CIM (Common Information Model) which is derived through an SCADA (Supervisory Control And Data Acquisition) system; receiving input and switching out status information of reactive-load compensation equipment which is derived through a PI (Plant Information System), and reactive-load measurement section real-time data of transformer substations; on the basis of the CIM, optimally calculating the input and switching out status information of the reactive-load compensation equipment and the reactive-load measurement section real-time data through an optimized reactive voltage algorithm, and generating an optimized strategy, wherein the optimized reactive voltage algorithm comprises a primary dual interior point method, a branch-and-bound method and/or a voltage correcting control model method; and the AVC system controls optimization of the voltage according to the optimized strategy. The embodiment of the application further discloses an AVC system-based reactive voltage optimization device. Utilization efficiency of electrical energy can be improved through the embodiment of the application.

The invention provides a reactive voltage optimal control method for a wind power plant cluster. The reactive voltage optimal control method comprises the steps that whether the reactive voltage optimal control for the wind power plant cluster needs to be carried out or not is judged; the reactive source equipment adjustment range of wind power plants and a pooling station in the wind power plant cluster region is obtained; and a reactive voltage optimal control mathematic model for the wind power plant cluster is built and solved. According to the reactive voltage optimal control method, a wind power plant cluster access point is used as a central voltage control node, the wind power plant grid-tied point bus voltage of the cluster region and a transformer tap of a booster station of the wind power plant are regulated, reactive compensation equipment of the pooling station is regulated to have reactive power, and a transformer tap of the pooling station is also regulated, the pilot node is enabled to meet the control instruction range of a dispatching mechanism, meanwhile the quiescent voltage stability margin of the cluster region is enabled to be maximum, and the active power transmission loss is enabled to be minimum; the quiescent voltage stability margin in the wind power plant cluster region can be effectively improved, the grid active loss in the cluster region also can be reduced, the operating safety and stability of a system are improved, and the capacity of digesting and saving wind power of the system is also improved.

The invention provides a voltage threshold probability-based reactive power optimizing method for a grid containing a wind power plant, which aims to solve the problem that under the condition of wind power networking, the effect of the voltage optimizing control to an automatic voltage control system is not ideal. The method comprises the steps as follows: firstly, collecting grid operation parameters, basic parameters of each wind power generator in the wind power plant, and active power output data of the wind power plant; secondly, acquiring voltage impact factor, power conversion coefficient of the wind power generators and wind power plant active power probability distribution equation through the above parameters, and further obtaining voltage threshold probability; and lastly, establishing a reactive power optimizing model on the basis of the voltage threshold probability, adopting genetic algorithm to solve the model, and obtaining a control instruction of a reactive power device. According to the invention, the voltage threshold probability-based reactive power optimizing method substitutes a conventional reactive power optimizing method for the automatic voltage control system, can enable the voltage optimizing control to the automatic voltage control system to effectively control the reactive power device in the grid under the condition of wind power networking, and ensure the safe and economic operation of the grid.

A bi-directional amplifier (10) for a transceiver module for amplifying both transmit signals and receive signals propagating in opposite directions. The amplifier (10) includes first and second common gate FETs (22, 24) electrically coupled along a common transmission line (20). A first variable matching network (28) is electrically coupled to the transmission line (20) between a transmit signal input port (12) and the first FET (22), and a second variable matching network (30) is electrically coupled to the transmission line (20) between a receive signal input port (14) and the second FET (24). An interstage variable matching network (32) is electrically coupled to the transmission line (20) between the first and second FETs (22, 24). A DC voltage regulator (34) provides a DC bias signal to the matching networks (28, 30, 32) and the FETs (22, 24) so that different signal amplifications and different impedance matching characteristics can be provided for the transmit signal and the receive signal.

The invention relates to a global reactive voltage optimization method for a power transmission and distribution network. The method includes the steps that coordinate boundary points of a power transmission network and an active power distribution network are selected; a power transmission network reactive voltage optimization model including complementary constraints is established, and an interior point method is used for solving; the optimization voltage of the power transmission network is converted into a three-phase voltage which is used as the three-phase voltage of an active power distribution network root node; a three-phase reactive voltage optimization model including complementary constraints of the active power distribution network is established, and the interior point method is used for solving; the three-phase optimization power of the active power distribution network is summated and then is used as the corresponding load power of the power transmission network; reactive voltage optimization of the power transmission network and reactive voltage optimization of the active power distribution network are in alternate iteration, when every two adjacent iteration changes of the boundary point power of the power transmission and distribution network meet convergence precision, the global reactive voltage of the power transmission and distribution network is subjected to optimizing convergence, and accordingly a global reactive voltage optimizing strategy is obtained. The problem that the reactive voltage optimization results of the power transmission and distribution network are inconsistent at the boundary points of the power transmission and distribution network can be solved, voltage and power mismatching at the boundary points is eliminated, and reactive resources of the two stages of networks are optimized.

The invention relates to the field of active power distribution network voltage control and particularly discloses an active power distribution network voltage control method and system based on a distributed power supply. The method includes that an upper layer realizes the active power distribution network global voltage control by taking long-time scale economic operation of the active power distribution network as the principle by means of a power distribution network dynamic reconstruction method; the lower layer realizes the active power distribution network local voltage control by taking a feedback automatic voltage regulator and a capacitor as the controlled objects and taking the branch voltage level as the optimization object; and the voltage active control double-layer models coordinate with each other to make a more comprehensive voltage optimization strategy so that the voltage active control of the active power distribution network can be realized. Meanwhile, based on the voltage active control double-layer models, the trend constraint of the upper layer global voltage regulating model is relaxed by means of a second-order cone, the voltage active control double-layer models can be equivalently converted to a single-layer decision model by means of the kuhn-tucker condition, therefore, the model solution complexity is simplified on the basis of guaranteeing the active power distribution network voltage regulating performance, and the algorithm efficiency is improved.

The invention relates to a new VRLA battery float model. The model covers the steady state and transient float charge behaviour of both positive and negative electrodes. Backup analysis verifies the internal polarisation distribution for a conventional 2V-cell polarisation behaviours can be identified without the need for a physical reference electrode. The estimated individual electrode polarisation allows early detection of common failure modes like negative plate discharge as well as a reference for float voltage optimisation. Furthermore, the positive polarisation relating to minimum grid corrosion may be correlated with the occurrence of the peak of a “Tafel” like resistance used by the model. The model encourages utilisation of low signal perturbation for testing a cell's state of health and state of charge conditions while at float.

The invention discloses a multi-time scale microgrid voltage reactive power optimization control method. A DG (Distributed Generator) primary voltage control layer, a MGCC (Microgrid Central Controller) secondary voltage control layer and an EMS (Energy Manage System) tertiary voltage control layer are included. In the tertiary voltage control layer, voltage optimization coordination control which is composed of three parts of an objective function, an equality constraint and an inequality constraint is set. The multi-time scale microgrid voltage reactive power optimization control method provided by the invention comprehensively uses advantages of quickness of primary voltage control, accuracy of secondary voltage single-bus control and global optimization scheduling of tertiary voltage control, the reactive power regulation ability of the distributed generator unit existing in the microgrid is made full use of, the multi-bus node voltage level is maintained, reactive power circulation is suppressed, reactive power optimization distribution is realized, as much as reactive power margin and active power margin is provided for the microgrid, the system stability is improved, and the investment of system reactive power compensation equipment is reduced.

The invention relates to an optimization method for photovoltaic high-permeability network voltage based on an energy storage battery. The optimization method is characterized by comprising the following steps: analyzing a voltage out-of-limit mechanism and a mechanism for improving voltage out-of-limit based on the energy storage battery; improving an optimization model and solving of the voltage out-of-limit; and determining the optimal allocation capacity of the energy storage battery. The angle of users is taken into full consideration, the voltage out-of-limit mechanism and the mechanism for improving voltage out-of-limit based on the energy storage battery are combined, the level of system node voltage is improved through genetic algorithm solving, the optimal allocation capacity value of the energy storage battery is obtained, the optimization method has the advantages of being scientific, reasonable, excellent in practical effect and the like, and the basis can be provided for constant volume, operational control and the like of the energy storage battery in a power distribution network.

Methods and systems are disclosed that may be employed to implement adaptive FET drive voltage optimization for voltage regulator (VR) integrated power stages (IPstages) that have different MOSFET RDS(on) characteristics to improve VR efficiency and current-sense accuracy.

The invention provides a voltage optimization control method of an off-grid energy storage converter based on compound control. The optimization control method comprises the steps of summing outputs of repetitive control and PID (Proportion Integration Differentiation) control as a control signal of the energy storage converter, allowing the PID control to adjust a deviation of an effective value of voltage, obtaining PID control quantity, allowing the repetitive control to adjust a deviation of actual output voltage and analog sinusoidal voltage of the energy storage converter, and obtaining repetitive control quantity. The method solves the problem of poor power quality of a power supply system caused by non-linear load connection, and improves the power quality of the power supply system during off-grid operation of the energy storage converter.

The invention discloses an energy-saving management platform based on whole network monitoring reactive compensation technology. The energy-saving management platform comprises a master control program module, a database module and an SCADA system interface module. The SCADA system interface module is used for allowing a reactive voltage optimization server to collect state parameters of the head end of a 10kV distribution network from an SCADA system of a dispatching center; and the master control program module is used for allowing a master control program to obtain such data from a memory database of the database module, then, carrying out a series of calculating and processing to generate comprehensive instructions for adjusting capacitors and taps, and sending control information to each controller to execute operation. The management platform realizes display of data information, such as node voltages, transformer current, capacitor compensation capacity, bus switch state and power factor, which are controlled by different controllers, in a display device, and realizes remote control of behaviors of each controller; and in the analysis process, the system can keep records of the whole process according to actual needs, thereby providing data basis for follow-up analysis.

The invention discloses a multi-source reactive power optimization control method for a power system. The multi-source reactive power optimization control method main comprises day-ahead optimization scheduling and intraday optimization correction, wherein the day-ahead optimization scheduling comprises the following steps: building a day-ahead optimization scheduling model according to parameters of the power system, obtaining day-ahead reactive power scheduling plans of a shunt capacitor bank and transformer taps in a power grid by the model, and providing the day-ahead reactive power scheduling plans of the shunt capacitor bank and the transformer taps in the power grid for the intraday optimization correction; the intraday optimization correction is updating scheduling information of the shunt capacitor bank and the transformer taps in the power grid by the day-ahead reactive power scheduling plans in real time; a real-time optimization scheduling scheme of an electric vehicle charging pile for intraday normal operation is obtained through the built optimization module for intraday normal operation or a reactive voltage optimization control scheme for the shunt capacitor bank in intraday fault operation is obtained according to the optimization module for intraday fault operation; and finally the optimization regulation and control of an intraday reactive power source are achieved.

The invention discloses a voltage optimization method of an electric-field coupling type wireless charging technology of an electromobile, and relates to the technical field of electric-field couplingtype wireless charging. A direct current power supply, a high-frequency inverter, a primary edge compensation structure, a coupling structure, a secondary edge compensation structure, a high-frequency rectifier and a load which are successively connected are involved. The coupling structure comprises a simulation ground, a simulation electromobile shell and a coupling pole plate set, the couplingpole plate set comprises two transmitting pole plates and two receiving pole plates, and every two of the transmitting pole plates, the receiving pole plates, the simulation ground and the simulationelectromobile shell form a capacitor. The method comprises the steps that firstly, parameters, input voltages, output voltages and output powers of all the capacitors among the pole plates in the system are determined, then the system frequency v is selected, the system frequency v is compared with the lowest system frequency fmin obtained from calculation of the parameters, the system frequencyv is determined, inductance values of all transmitting coils and receiving coils are calculated, and based on the calculated inductance values, the transmitting coils and the receiving coils are manufactured to construct a CPT system circuit.

The invention belongs to the technical field of reactive voltage control of a power grid, in particular relates to a layered and zoned reactive voltage analysis method based on a boundary condition. The layered and zoned reactive voltage analysis method comprises the following steps of making the power grid layered and zoned; determining a researched zone and a boundary thereof; inputting maximum daily load, minimum daily load, output of a power generator, the boundary condition, a reactive compensation configuration condition and a limit value of a regional power grid; carrying out power flow calculation, adjusting reactive compensation capacity, and adjusting the boundary of the regional power grid to the boundary condition; judging whether an out-of-limit situation exists in the voltage in a region or not; and judging whether a power factor of each main transformer conforms to the stipulation of the limit value or not. According to the layered and zoned reactive voltage analysis method, reactive voltage correction and reactive voltage optimization can be fulfilled, the reactive voltage analysis efficiency of a large-sized power grid can be substantially improved, focused analysis can be conducted with regard to a local power grid, and the layered and zoned reactive voltage analysis method is suitably used for situations with relatively complete data of the local power grid and insufficient data of a large power grid; and the layered and zoned reactive voltage analysis method is easy to understand and implement, is proximate to actual running of the power grid, and is suitably for on-line application.

The invention discloses the theoretical line loss online accurate calculation system of actually-measured data. The system comprises the following processes of 1) a preparation process before an actual test; 2) a data actual measurement process; 3) a data arrangement process; 4) a line loss calculating process; and 5) result analysis. The system has great advantages in data graph acquisition, datacalculation method diversity, calculation result analysis, and calculation result report and summary report output. Aiming at a calculation result, line loss analysis and a loss-reduction auxiliary decision can be performed, and the reactive power optimization of a transmission and distribution network, transformer-substation economic operation, network loss sharing, harmonic negative sequence analysis, low-voltage area power supply position optimization, high energy consumption distribution transform replacement, voltage optimization suggesting, lead replacement, three-phase unbalance adjustment and other loss-reduction auxiliary decision functions are realized. According to the demand of a client, different calculation result reports are selected, and according to load actual measurement and the format of a line loss theory calculation analysis report template, the report is generated, which is convenient for filling in the report in a later period; and the accuracy of line loss calculating and work efficiency are effectively increased.

The invention proposes a power distribution network reactive power optimization method giving consideration to power randomness, and belongs to the technical field of power system operation and control. The method comprises the steps: firstly establishing a power distribution network reactive voltage optimization model composed of a target function and a constraint condition; secondly transforminga model constraint condition, and collecting the set of prediction error values of the active load of all nodes in the distribution network at each moment and a distributed supply power prediction error value set, constructing a probability distribution set of corresponding uncertainties according to statistical information, constructing a chance constraint including the transmission power and node voltages, and converting the chance constraint into a deterministic linear constraint by using the convex relaxation; finally solving the model through a convex programming algorithm, and obtaininga power distribution network reactive voltage optimization result. The method achieves the solving of the power distribution network reactive voltage optimization problem during the consideration ofthe power randomness, and the result is higher in credibility and robustness. The method can achieve the quick solving for a large-scale complex power distribution network.

The invention discloses a wind power collection area reactive voltage control method considering wind power uncertainty. The method comprises the following steps that a wind power cluster control master station acquires a regulation range and wind power prediction data of wind power plant reactive power equipment in a wind power cluster; the wind power cluster control master station acquires real-time power flow data of the wind power collection area, and receives a voltage optimization control instruction issued by a dispatching master station; and the wind power cluster control master station, by taking the collection station of the wind power plant cluster as a voltage central point, establishes and solves a wind power plant cluster reactive voltage coordination control optimization model considering wind power uncertainty. It is ensured that the central node still meets the voltage optimization control instruction range of the dispatching master station under a condition that the wind power is randomly fluctuating, by means of coordination and control of the grid-connected point bus voltage of each wind power plant and the reactive power output of the reactive power equipment of the collection station; and meanwhile, the dynamic reactive reserve of the wind power collection area is in the maximum, so that the voltage stability of the system is improved.