61 results about "Total system power" patented technology

An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially an HDMI transmitter circuit, is disclosed. In an HDMI transmitter the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations of circuits this power, supplied by the receiver circuit, is wasted in the DC set-up circuit of the differential line driver. It is suggested to use this wasted power from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power in the line driver for powering the peripheral circuits reduces the total system power.

The forward power overload controlling method for CDMA system includes counting total emitting power in every frame of system; averaging total emitting power in every overload period to obtain the total system power in the overload period; comparing the total system power in the overload period with preset several levels of overload controlling threshold to judge the system power load case; and starting corresponding overload control operation if the total system emitting power is greater than the lower preset threshold P1. The present invention considers the control speed and validity of overload control and the utlization of system power resource and raises the system capacity while ensuring system safety and relaibility.

The present disclosure provides apparatus and methods for dynamic analog tuning for power reduction. As disclosed herein, the analog controls on a high-speed serial communication channel are dynamically adjusted in a manner so as to either reduce the total system power or move power dissipation between the transmitter and receiver devices, with little or no negative effect to the bit error rate. One embodiment relates to a method for tuning a communication link. The method includes occasionally determining whether the bit error rate for the communication link is acceptably low. Control parameters for analog circuitry of the communication link are adjusted to decrease power used if the bit error rate is acceptably low and are adjusted to increase power used if the bit error rate is not acceptably low. Other embodiments, aspects and features are also disclosed.

The invention discloses a resource allocation method in a multi-user cooperative relay system on the basis of power minimization. According to the method, by means of equivalent channel gain, a two-hop link in the system is converted into a virtual direct-transmission link, then the joint optimization problem related to subcarrier allocation, relay selection and power allocation is decomposed into the following three sub-problems that firstly, the number of subcarriers occupied by users is determined by means of a power minimization rule according to average channel gain and the target rate of the users; secondly, on the principle that the channel condition is optimal, the target rate of the users is taken into consideration at the same time, subcarrier allocation is carried out in the mode that the subcarriers are used for selecting the users and a relay, so that the situation that one subcarrier is allocated to multiple users is avoided, and computation complexity is reduced; thirdly, by means of combination of a water-filling algorithm and channel environment, power allocation is carried out, and the fact that the total power of the system is minimum is guaranteed. Besides, in the processes of subcarrier allocation and relay selection, energy loaded on the subcarriers is minimum, and therefore energy consumption of the system is reduced.

A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a common dc-bus based upon the total system power available from one or more corresponding strings of PV modules. Due to the coordinated switching of the dc-dc converters, each dc-dc converter transferring power to the common dc-bus continues to operate within its optimal efficiency range as well as to optimize the maximum power point tracking in order to increase the energy yield of the PV power plant.

The invention relates to the technical field of central air conditioner energy saving, in particular to a refrigerating system cooling water energy-saving control method. Under the conditions that the load of a refrigeration main machine is determined, and the cooling water inlet temperature of the refrigeration main machine is determined, the refrigerating system cooling water energy-saving control method comprises the steps that first, working condition parameter data, containing some parameter x, of an air conditioner system are obtained; second, the current system total power W[x] is obtained through calculation according to the working condition parameter data; third, the parameter x and the current system total power W[x] corresponding to the parameter x are stored in a database; fourth, system total power W[x<+>] and W[x<->] corresponding to two working condition parameters x<+> and x<-> respectively are obtained, the x<+> and the x<-> are adjacent to the numerical value of the parameter x, and the W[x<+>] and W[x<->] are compared with the W[x] to obtain an energy-saving working condition parameter; fifth, a corresponding device is adjusted to run according to the energy-saving working condition parameter. The invention further provides a refrigerating system cooling water energy-saving control system and device, and on the premise that it is ensured that the application performance requirement is met, an air conditioner refrigeration main machine and a cooling water pump run with the best overall efficiency, and the total system energy consumption is reduced.

The invention discloses a power allocation method and a device in a multi-user MIMO (Multiple Input Multiple Output) system, wherein the method comprises the steps of: receiving a radio-frequency signal X; carrying out decoded operation of r=WX on the received radio-frequency signalsX by using a decoding matrix W, and carrying out singular value decomposition on each estimated user channel matrix; calculating signal to interface plus noise ratio (SINR) of each data stream in each user by using the signal r=W[HMAz+n] after decoding, and calculating corresponding bit error rate (BER) on the basis of the calculated SINR; and obtaining a power allocation matrix A which makes the average BER of the system the least under the limitation of the total power of the system. The invention considers the influences of the evaluated errors of a channel to the performance of the system both in the processes of decoding operation and the bit error rate calculation, thereby being more suitable for theapplication to practical systems.

The invention relates to a power optimization method for multi-target position estimation of a distributed MIMO radar system. The method comprises the following steps of taking minimum radar system transmitting power as a target function, and establishing a transmitting power optimization model under the constraints of different position estimation accuracy requirements for multiple targets and anupper limit of radar transmitting power; loosening a non-convex optimization problem of power distribution to be a convex optimization problem through an SPCA algorithm, and solving an approximate solution of power distribution; and adopting a heuristic search algorithm to carry out further optimization on a power distribution result in order to obtain an optimal power distribution result. According to the method, the resource utilization rate can be maximized and the minimum power resources are consumed under the condition that the different position estimation requirements for multiple targets are met; less system consumption can be used, the resource utilization rate is improved while the calculation amount of the system is reduced; through controlling the target number and the position estimation precision requirement, the higher the target tracking precision requirement is, the more stable the performance is, and the more the number is, the more obvious the advantages are; and the method has better application value.

A method for network energy controller that can optimize total system power consumption is provided. The controller (100) collected device loads and report to a common device (270) for optimization. The controller is able to communicate both to other controllers on the same power source or to the internal device (205) that is connected to the controller. The common device is able to respond to power changes reported by controller and request other controller to reduce power so that the entire system power consumption can meet or optimized toward the power policy goal.

The invention provides a power distribution method for maximizing safety energy efficiency in a non-orthogonal multiple access system.A NOMA system with a function of eavesdropper wiretapping useful information is provided, meanwhile, physical layer safety and 5G green communication requirements are considered; safety energy efficiency SEE is defined as the ratio of the safety and the rate of theNOMA system to the total consumed power, then the power distribution factor of each legal user and the total power distribution factor of the system are designed in an optimized mode, an optimal powerdistribution scheme is sought, and SEE maximization of the system is achieved.

A kind of symmetrically distributed supply and a motor drive system used in electric cars includes an energy conversion power source composed of a low-voltage battery, a starting motor, an engine and a generator driven by energy sources, in which, the three-phase AC supply end of the generator is connected with a power battery by a power rectifier to make up of a mixed drive power source to drive a set of motor driven branch composed of a driving inverter and a driving motor and connect said power battery and low voltage battery by a DC / DC conversion unit characterizing that another set of independent three-phase AC supply end is added to the generator connecting to symmetrically added another power rectifier and a power battery to constitute another mixed driving power source, which is connected with anther motor drive branch composed of symmetrically added drive inverter and a motor and adds another DC / DC conversion unit to connect another power battery and a low voltage battery.

The invention discloses a distributed control method for coordinating the charging and discharging efficiency of the energy storage systems of a power distribution network. The method includes the following steps that: step 10) local power shortage is calculated: step 20) the sharing of the power shortage is realized, and the total power shortage of the systems is obtained; step 30) the marginal charging cost of each energy storage system is calculated, a preset pinning consistency value is determined; step 40) each energy storage agency is made to achieve consistency through pinning control; and step 50) the charging power of the energy storage systems in the power distribution network is adjusted. The control method is a completely distributed control method. With the control method adopted, global information sharing can be realized in a distributed manner, the requirement of distributed units, for plug-and-play operation, can be satisfied; marginal charging cost and charging states are considered, and the charging power of the energy storage systems is adjusted finely; and therefore, the charging and discharging efficiency of the energy storage systems in the power distribution network can be coordinated and optimized.

The invention belongs to the technical field of charging control of electric vehicles, and particularly relates to a charging method of an electric vehicle in a residential area, based on low-voltage power line carrier communications. According to the method disclosed by the invention, the going-out law and the travelling law of private electric vehicles are fully utilized, power measurement modules and carrier communication modules are mounted at positions where a 0.4kV outgoing line master switch of a distribution transformer in the residential area is mounted, one carrier communication module is mounted on each charging pile, and the total power of a system is received in a real-time manner; the time that the electric vehicle begins to be charged is determined by the charging pile according to the charging requirements of the electric vehicle and the total power of the current system. According to the charging method disclosed by the invention, under the premise that the requirement of a user for using the vehicle is met, the charge requirement of the user is transferred to a valley time period, and the charging requirements of more electric vehicles can be met to the maximum extent. The electricity consumption load peak caused by disordered charging and excessive and intensive charging at the valley time period is avoided, a complex charging management master station system does not need to be constructed, the charging method is independent of an intelligent optimization algorithm, the expansion fees of the distribution network can be greatly reduced, and the charging fees of the electric vehicles can be minimized.

The invention discloses a current equalization circuit for a multi-module shunt-wound power supply. The current equalization circuit comprises a sampling resistor R1, an operational amplifier N1 and a divider resistor R2, and further comprises a diode V1, an operational amplifier N4, a divider resistor R10, a divider resistor R11, a divider resistor R12, a grounding resistor R13 and a feedback resistor R14, wherein one end of a divider resistor R4 is connected with the positive input terminal of the operational amplifier N1, and other end of the divider resistor R4 is grounded. When the current equalization circuit works, the module with the maximum output current, in a plurality of shunt-wound modules, automatically serves as a main module, and other modules are slave modules; voltage errors of all the modules are sequentially regulated to correct unbalanced current distribution of a load; when the gross power of a system has a larger margin in comparison with the load, the failure of a single module can not influence the normal operation of the shunt-wound power supply; and as a redundant design of the shunt-wound power supply is added, the product reliability is effectively improved.

A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a common dc-bus based upon the total system power available from one or more corresponding strings of PV modules. Due to the coordinated switching of the dc-dc converters, each dc-dc converter transferring power to the common dc-bus continues to operate within its optimal efficiency range as well as to optimize the maximum power point tracking in order to increase the energy yield of the PV power plant.

The invention relates to an interaction simulation and optimization method for power distribution and utilization in an industrial park comprising multiple participants. Each participant takes the minimum operating cost as an objective, and an expected exchange power is obtained through decision making; an operational platform collects the expected exchange power of each participant; by taking minimum system power loss as an objective, adjusted expected exchange power is obtained through decision making and broadcasted to each participant; interaction and optimization of the expected exchange power is carried out circularly in sequence until stopping criterion is satisfied; namely, in the interaction and optimization process, only the expected exchange power of each participant needs to be interacted; when the stopping criterion is satisfied, whether the power loss is converged to an optimal value or not is detected; and when the power loss is converged to the optimal value, the operating cost of each participant and the total system power loss achieve the optimized state, so that the minimum total operating cost is realized.

The invention discloses a power distribution method of a hardware damage large-scale MIMO bidirectional relay system under MR preprocessing, which is used for distributing power for each user and a large-scale MIMO relay to maximize system spectrum efficiency. The method comprises the following steps: 1, by the hardware damage large-scale MIMO bidirectional relay, receiving a pilot channel sent bya bidirectional user, and obtaining an estimated channel matrix; 2, according to estimated channel information, the number of users and the number of base station antennae, calculating an uplink MRCreceiving detection and downlink MRT precoding matrix; 3, according to limit of system total power, building a non-convexity optimization function for maximizing the spectrum efficiency, and converting the non-convex optimization function into a convex optimization function; 4, according to the convex optimization function, calculating distribution power of each user and the large-scale MIMO relay. The method considers large-scale MIMO hardware damage and LOS / NLOS fading environment, and can provide a power distribution scheme for the user and the large-scale MIMO relay more rationally.

An equality constraint processing method for dynamic economical scheduling of a wind-driven, water-driven and thermal-power-driven electric power system comprises the following steps of 1, establishing an equality constraint in a dynamic economical scheduling model of the wind-driven, water-driven and thermal-power-driven electric power system, screening out candidate solutions which are generated by an optimizing algorithm in current iteration and do not satisfy the equality constraint, calculating an equality constraint violation amount of the candidate solutions, and determining a total power adjusting amount of the system; 2, setting a system total power upward-adjusting and downward-adjusting principle which comprises an output adjusting sequence of each power generator set and a system total power adjusting amount distributing principle; and 3, distributing the system total power adjusting amount according to the system total power upward-adjusting and downward-adjusting principle which is set in the step 2, and obtaining an output value of each power generator set, wherein the output value of each power generator set satisfies the equality constraint. The equality constraint processing method settles a problem of solving efficiency and convergence reduction caused by incapability of satisfying the equality constraint in solving a dynamic economical scheduling problem in solving a dynamic economic scheduling problem of the power system in prior art.

The invention provides a layered structure of a bipolar DC system adopting a plurlaity of voltage equalizers connected in parallel and a control method. The structure comprises a coordinated control structure between independent voltage sources IVS and a coordinated control structure between voltage equalizers VB. The coordinated control between the independent voltage sources IVS includes two layers, and the coordinated control between the voltage equalizers VB includes three layers. Based on the analysis of the basic access mode in the bipolar system, the invention obtains three basic voltage unbalance forms in the bipolar system, and puts forward a multi-voltage equalizer parallel ''unbalanced voltage-power'' sag control strategy suitable for three voltage uneven working conditions, thereby realizing the redundant configuration of the multi-voltage equalizer in the bipolar system and improving the system reliability. At that same time, the total power loss of the system is reduce bythe coordinated operation of the voltage equalizers.

The invention discloses a power distribution method of a two-way multi-hop network based on physical layer network coding, which is characterized by comprising the following steps: S1, establishing a two-way multi-hop network with N nodes; S2, utilizing a Frisk formula (the formula is shown in the specification) to calculate propagation loss of each link; S3, calculating a system parameter w according to a formula (the formula is shown in the specification); S4, setting the total transmitting power of a system as PT; and S5, according to formulas (the formulas are shown in the specification),determining the transmitting power PN of each node. The power distribution method has the beneficial effects that due to the adoption of the method, the optimum transmitting power value of each node can be obtained, the nodes in the network carries out power control according to the obtained optimum transmitting power value, and under the condition that the total power of the system is constant, theinterrupt probability of the system can be minimum, so that the stability and the reliability of the system are improved.

The invention discloses a dynamic selection multi-relay station cooperative transmission method belonging to the technical field of wireless communication. By the scheme that only one relay is selected to participate in cooperative transmission, the reception signal to noise ratio of a user can be improved, thereby reducing the error rate and improving the transmission reliability and the servicequality. Because a timer scheme is adopted in the invention to substitute parameter report, the signaling expense can be effectively reduced, and the wireless resource is saved. The dynamic selectionmulti-relay station cooperative transmission method disclosed by the invention is used for cooperative transmission of downlink data, and improves the data transmission rate for the user in an environment with a low signal to interference and noise ratio under the condition of minimizing the utilization of frequency resources and system total power.

The invention provides a resource allocation method for a relay node adopting decode-and-forward transmission mode in a collaborative orthogonal frequency division multiplexing system. A first technical scheme is applied to total system power restraint conditions, and specifically comprises the following steps of: 1, sub-carrier matching and relay node selection; 2, the power allocation of sub-carrier pairs; and 3, the power allocation between the sub-carriers in each sub-carrier pair. By the first technical scheme, the execution of the power allocation is simplified. A second technical scheme is applied to node power independently-restrained conditions, and specifically comprises the following steps of: 1, the sub-carrier matching; 2, initial power allocation; 3, the power regulation of each sub-carrier of the relay node; and 4, the recovery of surplus power of a source node. By the second technical scheme, the total power consumption of a system is minimized on the basis of ensuring the maximum of system capacity so as to fulfill the aim of prolonging the time to live of the node.

The invention discloses a power splitting method for modulating a limited system, including the following steps: a. the maximum transmission speed of each sub-channel is determined according to the maximum modulation coding manner; b. a sending terminal arranges each sub-channel according to down channel eigenvalue matrix so that the strongest sub-channel is used as the current sub-channel and the system gross power is used as the current splitting power; c. the sending terminal counts the original power of the current sub-channel and the saturation power of the current sub-channel so that the actual transmission power of the sub-channel is determined according to the minimum value of original power and saturation power; d. the sending terminal uses the difference of the current splitting power and the actual transmission power of the current sub-channel as new current splitting power, and whether the current sub-channel is a subweak sub-channel is judged; if so, the current splitting power is distributed to the weakest sub-channel and the process is finished; or, the next sub-channel is used as the current sub-channel and the step c is returned back. The application of the method in the invention can guarantee system volume and meanwhile save system power.

The invention discloses an airplane electrothermal deicing system optimizing method and belongs to the technical field of airplane ice preventing and removing. The airplane electrothermal deicing system optimizing method comprises the steps that according to set deicing periods and different segmentation methods of a protection area, heating time periods in the deicing periods corresponding to the different segmentation methods are determined; according to flight conditions and given different deicing surface power degrees, a relation curve of deicing power consumption, deicing surface power and heating time is determined; then ice preventing surface power of a continuous heating element is determined; deicing power consumption of periodic heating elements corresponding to the different segmentation methods is determined; deicing surface power of the periodic heating elements corresponding to the different segmentation methods is determined; total system power consumption corresponding to the different segmentation methods is determined; and finally the segmentation method corresponding to the minimum total power consumption is selected. Multi-segment deicing is carried out on an airfoil in the extending direction, the minimum power consumption is determined through the optimizing method, and the deicing effect is improved.

A cooling system for cooling a temperature-dependent power device includes an active cooling device and a controller to generate and transmit a drive signal thereto to selectively activate the device. The controller receives an input from sensors regarding the cooling device power consumption and measured operational parameters of the power equipment—including the power device output power if the device is a power producing device or the power device input power if the device is a power consuming device. The controller generates and transmits a drive signal to the cooling device based on the cooling device power consumption and the measured power device input or output power in order to cause the active cooling device to selectively cool the heat producing power device. A net system power output or total system power input can be maximized / minimized by controlling an amount of convection cooling provided by the cooling device.

An apparatus and method for supplying power to the peripheral circuits of a transmitter circuit, especially an HDMI transmitter circuit, is disclosed. In an HDMI transmitter, the termination resistors of the output driver are part of the receiver. DC power for the driver is supplied through these termination resistors. In prior art implementations, power supplied by the receiver circuit is wasted in the DC set-up circuit of the differential line driver. In various embodiments, this wasted power may be recovered from the remote termination to power selected peripheral circuits of the transmitter. The use of this wasted power may reduce the total system power consumption.

The invention discloses a solar energy auxiliary re-heat and back-heat thermal power generation system. A boiler is sequentially connected with a stream turbine, a condenser, a main circulation pump, a bleeder heater to form a main circulation circuit; a condenser mirror field focuses the sun light to a solar energy heat absorber; the solar energy heat absorber, a solar energy high temperature re-heater, a solar energy back-heat re-heater, a secondary circulation pump, the solar energy heat absorber are sequentially connected with to form a secondary circulation circuit; the inlet of a low pressure cylinder of the stream turbine is sequentially connected with the solar energy high temperature re-heater and the outlet of a high pressure cylinder of the stream turbine to form a re-heat circuit; a re-heat extraction opening of the low pressure cylinder of the stream turbine is sequentially connected with the solar energy back-heat re-heater, the bleeder heater; the stream turbine is connected with an electric generator. According to the solar energy auxiliary re-heat and back-heat thermal power generation system and an emission reduction and dilatation method, by the adoption of solar energy secondary circulation, the goal of reducing coal consumption and improving system total power is realized through increasing re-heat field and back-heat re-heat. On a basis of taking full advantage of the solar energy, the original system can automatically operate and the function of utilizing the solar energy thermal storage to meet the supply energy demand of adjusting peaks and valleys of the system is achieved.

The invention discloses a resource allocation method of an MIMO-OFDMA system. In sub-carrier allocation, first, sub-carriers are partitioned into blocks, then, first sub-carrier blocks are allocated to users in sequence, the sub-carrier block with the largest sum of channel gain characteristic values of all the sub-carriers in the sub-carrier block of the users is selected, a simplified user capacity calculation formula is used for obtaining user capacities, the users with the lowest capacity are selected in sequence so that the remaining sub-carrier blocks can be allocated to the users, and the user capacities are updated till allocation is completed; in power allocation, the power of the first user is obtained first, then, the power of other users is obtained through calculation according to parameters such as a fairness factor, and finally the power of all the users is reallocated. According to the resource allocation method of the MIMO-OFDMA system, on the premise that fairness between the users and the limitation of the total power of the system are taken into full consideration, the calculation complexity is reduced while the system capacity can be maximized.

A data security shunt transmission method based on linear search comprises the following steps of: (1) from the view of intelligent equipment SD in a wireless network, transmitting a part of data to abase station BS, and shunting the other part to a low power wireless access node AP, wherein there is also a situation that the data is eavesdropped by a hidden eavesdropper, and the optimization problem that minimizes the total system power consumption is described as a non-convex optimization problem in the case of ensuring data transmission requirements and safety overflow limit; (2) vertically resolving the TPM problem to a two-level optimization problem; (3) proposing a monotonically optimized power control method according to the underlying problem to optimize the transmission power ofSD; (4) proposing a linear search method for the top problem to further save energy and optimize the total consumed power of the system; and (5) finally solving the TPM problem through interactive iteration between the underlying problem and the top problem. The invention has relatively high security and reliability.

The invention relates to a brushless doubly-fed motor control method, device and system, and is applied to a host frequency converter. The method comprises the steps that a start instruction is received, the output of the frequency converter group system is calculated according to the measurement parameter and the preset rotating speed, and the host frequency converter and the slave frequency converter are connected with the corresponding branch of the brushless doubly-fed motor control winding; the brushless doubly-fed motor is controlled to enter the corresponding operation state according to the output of the frequency converter group system; and when the fault information transmitted by the slave frequency converter is received, the corresponding fault slave frequency converter is cutoff. According to the brushless doubly-fed motor control method, device and system, the host frequency converter and the slave frequency converter are connected with the corresponding branch of the control winding, each frequency converter only requires to bear a part of the total power of the system and the host frequency converter is adopted to control the frequency converter group system and the fault slave frequency converter can be directly cut off in case of fault so as to have the advantage of high reliability in comparison with the conventional frequency converter.