Remote power supply voltage drop compensation system

Abstract

The invention provides a long-distance power supply voltage drop compensation system, and the system comprises a first calculation module which is used for calculating the voltage drop of a main cable; the second calculation module is used for calculating the voltage drop of the branch cable; a power supply with adjustable voltage, wherein the power supply with adjustable voltage can adjust the voltage of the source end; and the voltage drop compensation calculation control module is used for carrying out real-time calculation on parameters and load changes in each cable circuit and automatically controlling the voltage-adjustable power supply to carry out automatic voltage drop compensation on the output voltage according to a calculation result.

Description

Technical Field

[0001] This invention relates to the field of voltage regulation technology, and more specifically to a long-distance voltage drop compensation system. Background Technology

[0002] When selecting cables for long-distance power supply, it's crucial to consider not only the cable's current carrying capacity but also its voltage drop. In a circuit, as current flows through a cable, the wire's resistance causes a potential difference to be lost, resulting in a voltage decrease—a phenomenon known as "voltage drop." Cable selection must consider factors such as cable resistance, cable length, and transmission power. Especially in long-distance circuit connections, cable resistance is relatively high. Because current flow is impeded, the potential difference decreases, leading to a lower voltage required by the electrical equipment, affecting its normal operation and potentially damaging it. In long-distance, high-power power supply modes, increasing the cable cross-section is primarily driven by the need to increase cable area and reduce resistance to minimize voltage drop.

[0003] To address the voltage drop issue when cables are over long distances, the following methods are generally used in existing technologies:

[0004] First, choose conductor materials with lower resistivity to reduce cable resistance, such as highly conductive copper. However, copper cables are more expensive and require additional investment.

[0005] Second, using a larger conductor cross-sectional area reduces cable resistance, which also increases investment costs.

[0006] Third, increase the voltage level of the power grid;

[0007] Fourth, adjust the total output voltage by adjusting the transformer tap positions. Generally, a 10kV dry-type transformer can be divided into 5 tap positions, for example: 10kV ±2×2.5%, with five tap positions. The general tap changer positions are allocated as follows, taking a symmetrical positive and negative tap position as an example: the first tap is +5%, which is 10500V; the second tap is 10250V; the third tap is the rated voltage: 10000V; the fourth tap is 90750V; and the fifth tap is 90500V.

[0008] This is a commonly used technical method, but the voltage regulation range is limited, and non-dynamic voltage regulation requires power outages, making it non-precise voltage regulation.

[0009] The inventors conducted a thorough and comprehensive search of the present invention and obtained the following prior art. These prior art will now be briefly introduced and compared with the technical solution of the present invention to better understand the inventive concept of the present invention and to demonstrate the technical advantages and technical features of the present invention.

[0010] Prior art 1:

[0011] CN101106277A discloses a reactive power optimization compensation method for 10kV distribution network unit lines, belonging to the field of power transmission and distribution technology, used to solve the reactive power optimization compensation problem in high-voltage distribution networks. The technical solution is as follows: First, the flow direction of active and reactive power in the unit line, the length of each line segment, and the resistance are monitored and measured. Then, different types of conductors are converted into conductors of the same type but different lengths, and a curve showing the change of reactive power with the equivalent length of the converted line is plotted. Then, based on the principle of equal compensation amount, the location, number, and capacity of compensation points are determined on this curve, and the locations of these compensation points are restored to the actual line locations, and compensation capacitors are configured at each compensation point. However, this prior art increases the voltage at the compensation point by calculating the reactive power loss on the line and configuring compensation capacitors to compensate for the voltage drop. This invention, on the other hand, increases the voltage on the power supply side to compensate for the voltage drop; the technical approaches are fundamentally different.

[0012] Prior art 2:

[0013] CN101119030A discloses a method for configuring compensation capacitors in 10kV and below distribution networks. By installing line compensation capacitors on the distribution network lines and distribution transformer compensation capacitors on the low-voltage side of the distribution network transformers, the method ensures the voltage of the final users in the distribution network is qualified and minimizes power loss. The line compensation capacitors include 10kV and 0.4kV line compensation capacitors, and the distribution transformer compensation capacitors are 0.4kV distribution transformer compensation capacitors. This method changes the voltage optimization control objective from "ensuring the 10kV bus voltage of the substation is qualified" to "ensuring the voltage of the final users in the distribution network is qualified," making it possible to "minimize the line loss rate of the entire distribution network and maximize the voltage qualification rate of each node." However, the existing technology uses compensation capacitors to increase the voltage at the compensation point to compensate for voltage drop. This invention, on the other hand, increases the voltage on the power supply side to compensate for voltage drop, representing a fundamentally different technical approach.

[0014] Existing technology 3:

[0015] CN101728833A discloses a reactive power compensation method for low-voltage distribution lines, comprising the steps of: obtaining the active and reactive power values ​​of all loads on the low-voltage distribution line; and, based on different power grid structures and load characteristics, performing reactive power compensation on the distribution network line using a joint compensation method, which is a combination of automatic reactive power compensation and manual fixed reactive power compensation. This invention allows for flexible allocation and installation based on actual power grid conditions, fully leveraging the simplicity and economy of manual fixed compensation and the real-time and high efficiency of intelligent automatic compensation. It solves power quality problems such as large voltage drops, severe power losses, and low power factors, and significantly enhances voltage stability and transmission capacity, improving social and economic benefits and increasing equipment asset utilization. However, the existing technology uses reactive power compensation to increase the voltage at the compensation point to compensate for voltage drops. This invention, on the other hand, increases the voltage on the power supply side to compensate for voltage drops, representing a fundamentally different technical approach.

[0016] Existing technology 4:

[0017] CN103094913A discloses an optimized configuration and compensation method for 10kV shunt reactors in a distribution network, used to solve the problem of optimizing the inductive reactive power resource allocation and controlling the switching of reactive power compensation when small hydropower is connected to the distribution network. The specific steps of this method are as follows: A voltage drop reactive power decoupling formula is obtained by decoupling the voltage drop formula; the reactive power decoupling coefficient is determined based on the reactance per kilometer of line and the line reference voltage; the optimized configuration compensation point of the 10kV shunt reactor is determined based on the voltage distribution of small hydropower grid-connected nodes in the main line of the "abundant small-hydropower" mode; the configuration capacity of the 10kV shunt reactor to avoid exceeding the upper limit of the main line node voltage is determined based on the voltage distribution of the small hydropower grid-connected nodes in the "abundant small-hydropower" mode, and the single-group capacity and number of 10kV shunt reactors are determined with reference to the regulation that the voltage regulation effect of a single group of reactive power compensation equipment in a substation should not exceed 2.5% of the rated voltage; the voltage of the main line nodes containing small hydropower is monitored in real time, and the switching of the 10kV shunt reactors is controlled according to the voltage drop reactive power decoupling formula. However, the existing technology uses reactive power compensation to increase the voltage at the compensation point and compensate for the voltage drop. This invention, on the other hand, increases the voltage on the power supply side to compensate for the voltage drop; the technical approaches are fundamentally different.

[0018] Prior Art 5:

[0019] CN108667082A discloses a method, apparatus, and system for line loss compensation. It can determine the output current of a power supply and the cable parameters, and based on the output current and cable parameters, determine the line loss voltage drop of the cable. Furthermore, it can compensate the output voltage of the power supply according to the line loss voltage drop. Compared to existing technologies, in this embodiment, there is no need to set up a corresponding voltage compensation line or voltage detection circuit at the load end, thus reducing the system implementation cost; it also eliminates the need for the load end to process and transmit the received actual voltage, thus improving system reliability; and it eliminates the need for the power supply output to be raised by a fixed value, thus ensuring the system's load regulation rate. The prior art is the closest prior art to the present invention, but (1) the prior art uses the power supply as the calculation parameter of the device carrier, while the present invention uses the total load, single load, and load distribution as the calculation parameters of the device carrier; (2) the prior art uses the power supply output current as the calculation parameter, while the present invention uses the total load power, single load power, single load distribution, and load working voltage as the calculation parameters; (3) the prior art does not distinguish between the main cable and the branch cable in the voltage drop calculation, while the present invention calculates the voltage drop of the main cable and the voltage drop of the branch cable differently, and the formulas and parameters of the voltage drop of the main cable and the voltage drop of the branch cable are different; (4) the prior art needs to determine that the current change is not less than the threshold before starting the voltage drop compensation, while the present invention does not require this process; (5) the prior art needs to determine the new output current of the power supply in the process, while the present invention does not require this process; (6) the prior art needs to determine the new output current of the voltage in the process, while the present invention does not require this process.

[0020] Existing technology 6:

[0021] CN111880598A discloses a voltage compensation circuit for an adaptive load cable. First, an arithmetic module converts the output voltage of an error amplifier containing peak current limit information of the primary-side feedback flyback converter into a first intermediate voltage related to the output current of the primary-side feedback flyback converter. Then, the first intermediate voltage undergoes level shifting to obtain a second intermediate voltage that adapts to the common-mode input range of the voltage-to-current conversion module. Subsequently, the second intermediate voltage undergoes ripple elimination conversion to obtain a third intermediate voltage. This third intermediate voltage then passes through the voltage-to-current conversion module to obtain the corresponding current, generating a voltage drop across a fifth resistor to obtain a compensation voltage proportional to the output current. This compensation voltage is superimposed on the reference voltage for system loop adjustment to obtain a new reference voltage compensated by the load cable, used for system loop adjustment. This allows the output voltage of the primary-side feedback flyback converter to adaptively change with the load current, ensuring stable actual charging voltage. However, this prior art is an adaptive load cable voltage compensation circuit that uses an adaptive control system for information acquisition, feedback, and closed-loop voltage adjustment of multiple components in the system loop. This invention does not require real-time acquisition of relevant circuit information. Instead, it proactively adjusts the voltage-side output in advance according to requirements to achieve voltage compensation. It does not involve real-time acquisition and feedback of circuit information and is a non-automatic adjustment method.

[0022] Prior Art 7:

[0023] CN114243719A discloses an automatic voltage regulation device and system for long-distance power supply. The device includes an AC / DC converter, a DC / AC converter, and a compensation transformer. The AC / DC converter acquires the grid voltage and load current on the distribution line and generates a first output control voltage based on the DC bus voltage. The DC / AC converter connects to the AC / DC converter, inverting the DC bus voltage into an AC voltage and generating a second output control voltage based on the grid voltage and load current. The compensation transformer receives the AC voltage, generates a compensation voltage based on the AC voltage, and transmits the compensation voltage to the distribution line to match the voltage drop of the connecting cable. However, this prior art requires the acquisition of grid-side circuit information and the collection of voltage and current data from electrical equipment before adjustment and control. This invention does not require real-time acquisition of relevant circuit information; it proactively adjusts the voltage-side output according to demand to achieve voltage compensation. It lacks real-time circuit information acquisition and feedback, and is therefore a non-automatic adjustment method.

[0024] Existing technology 8:

[0025] CN114447941A discloses a unified power quality regulator voltage collaborative compensation control method and device. The method includes: calculating the reference voltage output on the series side based on the regulating point voltage and the rated voltage value on the load side; performing power balance control on the DC side energy storage output current to obtain an active power command value; performing reactive power voltage droop control on the effective value of the load side voltage and the rated voltage value on the load side to generate a reactive power command value; performing power-current dual closed-loop feedback control on the active power command value and the reactive power command value to obtain a first modulation voltage on the parallel side in a three-phase coordinate system; superimposing the first modulation voltage with a second modulation voltage obtained through harmonic control to obtain the reference voltage output on the parallel side; and performing collaborative compensation on the load side voltage based on the reference voltage output on the series side and the reference voltage output on the parallel side. This solves the technical problem in related technologies where the voltage compensation capability of the series-side converter is insufficient, making it impossible to achieve full load voltage compensation. However, this prior art uses closed-loop feedback control, performing power-current closed-loop feedback control based on active and reactive power commands, which requires information acquisition. This invention does not require real-time acquisition of relevant circuit information. Instead, it proactively adjusts the voltage-side output in advance according to requirements to achieve voltage compensation. It does not involve real-time acquisition and feedback of circuit information and is a non-automatic adjustment method.

[0026] Existing technology 9:

[0027] CN115603593A discloses an integrated power supply system and method for measuring and regulating voltage drop in long cable power supply. The system includes an AC-DC converter, a DC-AC converter, and a digital controller. The AC-DC converter operates in a regulated mode, providing a stable DC voltage for DC-AC conversion and performing power factor correction. The DC-AC converter, under the control of the digital controller, operates in either a voltage drop measurement mode or a regulated mode. In voltage drop measurement mode, it acquires the voltage at the front and rear ends of the long cable and calculates the voltage drop. In regulated mode, it outputs a stable AC voltage to the load. The digital controller automatically switches the DC-AC converter between regulated and voltage drop measurement modes. However, this prior art requires measuring and acquiring the voltage at the front and rear ends of the long cable and calculating the voltage drop, then performing voltage compensation on the power supply side. This invention does not require real-time acquisition of relevant circuit information; it proactively adjusts the voltage-side output according to demand to achieve voltage compensation. It lacks real-time circuit information acquisition and feedback, and is a non-automatic adjustment method.

[0028] Existing technology 10:

[0029] CN118174267A discloses a dynamic adjustment device for DC power supply voltage, comprising at least: a first acquisition and control unit for real-time acquisition of a first voltage output from the power supply end and transmission to a second acquisition and control unit; a second acquisition and control unit for real-time acquisition of a second voltage input to a compensation control unit; receiving the first voltage, obtaining the cable transmission loss voltage based on the first and second voltages, and transmitting it to the compensation control unit; and a compensation control unit, located at the load input end, for dynamically outputting a compensation voltage according to the loss voltage, thereby achieving dynamic compensation of the load input voltage and thus completing the dynamic adjustment of the DC power supply voltage. This invention not only achieves dynamic compensation of the load voltage at the end of the line, effectively increasing the power supply radius of the line at low cost, but also incorporates the line voltage drop compensation effect into the closed-loop management of the load-side voltage control, realizing real-time monitoring of the power quality of the load-side from the power supply end. However, this prior art requires dynamic acquisition of voltage information for closed-loop management. This invention does not require real-time acquisition of relevant circuit information; it proactively adjusts the voltage-side output according to demand to achieve voltage compensation. It lacks real-time circuit information acquisition and feedback, and is a non-automatic adjustment method.

[0030] Prior art 11:

[0031] JP2014027737A discloses a method and apparatus for calculating the setting value of a line voltage drop compensator. At the target point of the secondary voltage control of an automatic voltage regulator, where the main line, branch lines, and user load are connected to the secondary side of the automatic voltage regulator, the value of the set line voltage drop compensator is calculated. The method simulates the voltage drop of the main line divided into multiple segments using a point specified on the screen as a node. The method involves constructing a trunk line model consisting only of the trunk line, which includes at least the trunk line impedance as the line impedance of each segment. The method assumes, firstly, that the power factor of the voltage passing through the automatic voltage regulator is equal to the power factor of the current passing through each segment; secondly, that under heavy load, the main line model and the main line model's line loss are reduced; and thirdly, based on a second assumption of line loss, a first simplified model is constructed from the trunk line model. The steps to construct the first simplified model are: based on the first assumption, determine the current consumption of each part by allocating the ratio of the current consumption of each section to the current consumption of all sections according to the contract content of the power load; based on the second assumption, calculate the following equations (1) and (2) to obtain the set value of the voltage control target point, which is the end of the first contraction model that unifies the line impedance of all parts. However, in the prior art, "LDC stability value calculation device (computer with corresponding calculation program installed) is connected to the observation data storage device through the network" requires data collection; "tree diagram of power distribution system" focuses on the calculation of complex power distribution network; the present invention is a simple loop line voltage drop calculation compensation, and the present invention does not require real-time collection of relevant circuit information, but actively adjusts the voltage side output in advance according to the demand to achieve the purpose of voltage compensation, without the part of real-time circuit information collection and feedback, and is a non-automatic adjustment method.

[0032] Prior Art 12:

[0033] KR102230058B1 discloses a method and apparatus for adjusting transmission voltage. In a DC distribution system connected to a distributed power source, the method calculates the voltage data of each node in the distribution system, the system voltage rise / fall rate (calculating α_VPC for each node), and calculates the transmission voltage based on the system voltage rise / fall rate. By changing the transmission voltage according to the system voltage rise / fall rate, the method compensates for the line voltage drop caused by the output current of the distributed power source, keeping the voltage of the DC distribution system within the standard allowable range and solving the low voltage problem. However, this prior art requires the collection of "voltage data of each node in the system" before calculation and control. This invention does not require real-time collection of relevant circuit information; it proactively adjusts the voltage-side output in advance according to demand to achieve voltage compensation. It lacks real-time circuit information collection and feedback, and is a non-automatic adjustment method.

[0034] Prior art 13:

[0035] TWI559112B discloses a compensation method and circuit for adjusting output voltage according to load changes. It utilizes the correlation between the increasing current output of the power supply and the increasing load demand. By using the voltage-current conversion relationship, a preset second current is used to define the timing of voltage compensation, ensuring an appropriate compensation voltage is applied to stabilize the output voltage after passing through the power supply line within the rated range of the load, thus achieving a constant voltage. However, this prior art requires "acquiring a voltage detection signal" and then performing calculations and control. This invention does not require real-time acquisition of relevant circuit information; it proactively adjusts the voltage-side output according to demand to achieve voltage compensation. It lacks real-time circuit information acquisition and feedback, and is a non-automatic adjustment method.

[0036] Prior art 14:

[0037] WO2023215340A2 discloses an apparatus, system, and method for input voltage control of a remote device, comprising: a voltage source; at least one voltage sensor and at least one current sensor for measuring the output voltage and output current at the voltage source; and a voltage regulation system for compensating for the cable voltage drop between the voltage source and the RLU by adjusting the output voltage of the voltage source to a value that allows the RLU to receive a suitable voltage level from power transmission; wherein the RLU measures the output voltage and / or output current and sets the output voltage value according to a linear curve between two preset voltage values ​​corresponding to no-load (VoSetV) and full-load (VoSetV) input by the user. However, this prior art requires "measuring the output voltage and output current at the voltage source," while this invention does not require real-time acquisition of relevant circuit information. It proactively adjusts the voltage-side output according to demand to achieve voltage compensation, lacking real-time circuit information acquisition and feedback, and is a non-automatic adjustment method.

[0038] Prior art 15:

[0039] The document "Selection Method of External Power Supply Route and Line Voltage Drop Analysis for Large Power Customers" stipulates that for large power loads, a direct power supply route via the nearest substation or switching station must be adopted. Long-distance power distribution inevitably leads to excessive line voltage drops, causing the voltage at the customer's end to fail to meet normal voltage requirements. If reactive power cannot be compensated, simply limiting load power will not solve the customer's production needs. Before large power customers generate electricity, power supply companies must check the integrity of reactive power devices, harmonic devices, and emergency power supplies to ensure the safety and stability of the power grid. However, existing technologies emphasize the importance of reactive power compensation for voltage drops in power grid supply lines, which differs from the technical approach of this invention.

[0040] Prior art 16:

[0041] The paper "Research on Comprehensive Voltage Compensation Methods for Distribution Networks" describes various voltage compensation methods, including installing series compensation devices, parallel compensation devices, and using transformer off-load and on-load voltage regulation. For some lines with severe voltage drops at the end, a combination of methods is needed to meet quality requirements. This paper uses a typical radial line in a 10kV distribution network as an example, employing EMTP-ATP software simulation to study the compensation effects of series compensation devices, parallel compensation devices, and transformer voltage regulation on the voltage along the line during steady-state operation. This simulation yields a relatively effective comprehensive voltage regulation scheme for improving voltage losses along the line. However, this existing technology, which simulates the compensation effects of series compensation devices, parallel compensation devices, and transformer voltage regulation on the voltage along the line during steady-state operation and obtains a relatively effective comprehensive voltage regulation scheme for improving voltage losses along the line, differs from the present invention, which increases the voltage on the power supply side to compensate for voltage drops. The technical path is fundamentally different from that of this invention.

[0042] Prior art 17:

[0043] The paper "Principle and Implementation of Dynamic Impedance Regulator for Distribution Network Lines" proposes the concept of a dynamic impedance regulator. This regulator, based on a series-parallel hybrid power electronic converter, achieves flexible and dynamic distribution network impedance regulation by controlling the port characteristics of the series converter to have flexibly adjustable R / L / C characteristics at different frequency bands. The paper presents the circuit topology of the impedance regulator and the control strategy for implementing the R / L / C port characteristics of the series converter, analyzing its effect and capability in reducing load voltage deviation under steady-state conditions. A short-circuit current control strategy based on virtual impedance and voltage feedforward control is proposed to achieve flexible limitation of fault current. The paper analyzes the characteristics of short-circuit current variation under active compensation, the power interaction of the series converter, and the DC-side voltage balance control effect. Through simulations and experiments under linear and nonlinear loads and short-circuit faults, the paper verifies the compensation effect of the proposed method on voltage amplitude / waveform deviation and the limitation effect on fault current. However, the regulator described in the prior art is based on a series-parallel hybrid power electronic converter. It achieves flexible and dynamic distribution network impedance regulation by controlling the port characteristics of the series converter to have adjustable R / L / C characteristics of different magnitudes and polarities across different frequency bands. This invention, on the other hand, compensates for voltage drop by increasing the voltage on the power supply side. The technical approach is fundamentally different from that of this invention.

[0044] Based on the above description of the prior art, those skilled in the art will understand that existing voltage drop compensation systems have the following drawbacks:

[0045] 1. Existing technologies typically employ a closed-loop feedback control system, which collects relevant electrical signals such as load-side voltage, compensates them, collects them again, and then adjusts them. This is a dynamic compensation system that continuously collects and adjusts, making it difficult to control the dynamic stability of the system.

[0046] 2. In the existing technology, the transformers in the substation are usually adjusted by voltage level. The total output voltage is adjusted by adjusting the transformer level. Generally, the level is fixed for a long time based on whether the external grid voltage is high or low. This method of adjusting the level is inconvenient and requires the entire substation to be shut down. Moreover, there are not many levels, and the adjustment is rough. It also fails to consider and compensate for the voltage drop on the downstream power supply lines.

[0047] 3. Existing technology also adjusts the voltage by adding a voltage stabilizer. A voltage stabilizer is installed on the substation side to maintain the substation output at the standard 220 / 380V output when the external power grid fluctuates, but it fails to consider and compensate for the voltage drop on the downstream power supply lines.

[0048] 4. For long power supply distances, there may be a large voltage drop at the end. Current technology generally considers increasing the cross-sectional area of ​​the cable or conductor to reduce resistance, thereby reducing the voltage drop at the end of the line. Generally, the voltage drop at the end is considered to be ≤ 5%.

[0049] 5. Electrical appliances on the power consumption side are generally set with a voltage range, such as the Chinese standard voltage of 220V AC (single-phase) and 380V for three-phase. In actual operation, a deviation of ±10% (i.e., 198V~242V) is allowed. Electrical appliances can also operate normally if the voltage drop at the end of the line is within the allowable range. Therefore, existing technology, from the perspective of specifications, design and technical practice, does not require compensation for voltage drop on the line.

[0050] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0051] Based on the aforementioned existing technologies, this invention proposes a novel technical approach: the load in this invention is stable and controllable. By inputting fixed cable parameters and combining them with load regulation information, precise calculation and compensation are performed. This invention does not collect relevant electrical signals for feedback control after compensation, thus providing a stable voltage drop compensation method.

[0052] To address this, the present invention provides a long-distance power supply voltage drop compensation system, comprising: a first calculation module, which performs real-time calculations on parameters and load changes in the main cable circuit and obtains dynamic voltage drop calculation results; a second calculation module, which performs real-time calculations on parameters and load changes in the branch cable circuits and obtains dynamic voltage drop calculation results; an adjustable voltage power supply, which can adjust the source voltage; and a voltage drop compensation calculation control module, characterized in that...

[0053] The voltage drop compensation calculation and control module separately summarizes the dynamic voltage drop calculation results of the first calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation and control module separately summarizes the dynamic voltage drop calculation results of the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation and control module summarizes the dynamic voltage drop calculation results of the first calculation module and the dynamic voltage drop calculation results of the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results.

[0054] Furthermore, the first calculation module calculates the voltage drop of the main cable based on the rated power of the main cable. If the load power of the main cable changes during power supply, the first calculation module recalculates based on the changed load power of the main cable and transmits the calculation result to the voltage drop compensation calculation control module for summary calculation. The second calculation module calculates the voltage drop of the branch cables based on the rated power of the branch cables. If the load power of the branch cables changes during power supply, the second calculation module recalculates based on the changed load power of the branch cables and transmits the calculation result to the voltage drop compensation calculation control module for summary calculation.

[0055] Furthermore, during normal operation, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 The second calculation module calculates the voltage drop of the branch cable as ΔU. 分 Then the compensation voltage that the adjustable voltage power supply needs to increase is ΔU. 主 +ΔU 分 This is referred to as full compensation.

[0056] Furthermore, if the load power changes according to demand during the power supply process, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 If the load power changes during the power supply process, the second calculation module calculates the voltage drop of the branch cable as ΔU. 分 The adjustable voltage power supply needs to increase the compensation voltage by ΔU. 主 '+ΔU 分 (This is referred to as full compensation at this point).

[0057] Furthermore, if the voltage connected to the terminal load needs to be greater than 0.95U after compensation... 工作 , among which, U 工作 If the voltage is the operating voltage required by the load under its operating conditions, then the compensation voltage of the adjustable voltage power supply is set to ΔU. 欠补偿 Or ΔU 欠补偿 '(This is called undercompensation, ΔU)' 主 <Undercompensated voltage<ΔU 主 +ΔU 分 Alternatively, in the case of power adjustment, the compensation voltage can be set to ΔU. 主 < Undercompensated voltage < ΔU 主 '+ΔU 分 The minimum compensation principle for undercompensation is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 ).

[0058] Furthermore, if only the load power of the main cable changes during the power supply process, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 主 '.

[0059] Furthermore, if only the load power of the branch cable changes during the power supply process, the second calculation module calculates the voltage drop of the branch cable as ΔU. 分 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 分 '.

[0060] Furthermore, the formula for calculating the voltage drop of the main cable is as follows:

[0061] , , ,

[0062] Main cable resistance (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0063] Main cable voltage drop (U) 工作 (This refers to the operating voltage corresponding to the required operating state of the load).

[0064] Where P is the total load power, I is the main cable current, R is the main cable resistance, ρ is the resistivity of the main cable material, L is the main cable length, S is the main cable cross-sectional area, and U... 工作 This refers to the operating voltage required by the load under its operating conditions.

[0065] The formula for calculating the voltage drop of the branch cable is as follows:

[0066] p=U 工作 I', I'=p / U 工作 U 工作= I'*R',

[0067] Resistance of each section of branch cable (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0068] The current for each load is I' = p / U 工作 .

[0069] The voltage drop of the branch cable is ΔU 分 =I'*R'* n*(n+1) / 2.

[0070]

[0071] Where p is the power of a single load, I' is the current of a single load, and R' is the resistance of each segment of the branch cable (between two loads). L' is the resistivity of the branch cable material, L' is the length of each segment of the branch cable (between two loads), S' is the cross-sectional area of ​​the branch cable, and n is the number of loads distributed on the branch cable.

[0072] If the load adjusts its power according to the working requirements during the power supply application, then the voltage drop ΔU needs to be recalculated based on the total load power P and the individual load power p under the new state. 主 'and ΔU 分 '.

[0073] Ultimately, under the full compensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply to increase the compensated output voltage U11 to the operating voltage plus the full compensation voltage = U 工作 +ΔU 主 +ΔU 分 .

[0074] Under the undercompensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply to increase the compensation output voltage U11, which is the operating voltage plus the undercompensation voltage = U. 工作 +ΔU 欠补偿 The minimum compensation principle is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 .

[0075] Furthermore, the present invention also relates to a method for using the above-mentioned long-distance power supply drop compensation system, the method comprising the following steps:

[0076] (1) The upper-level system issues control information;

[0077] (2) After receiving the control information, the voltage drop compensation calculation control module calculates the total load power P and the load operating voltage U after the control is executed. 工作 Single load power p;

[0078] (3) Voltage drop ΔU of main cable 主 The calculation section calculates the voltage drop ΔU of the main cable based on the total load power P and the main cable parameters. 主 Numerical value;

[0079] (4) Branch cable voltage drop ΔU 分 The calculation section calculates the voltage drop ΔU of the branch cable based on the single load power p, branch cable parameters, and load distribution. 分 Numerical value;

[0080] (5) The summary calculation section, based on the set compensation strategy requirements and combined with U 工作 ΔU 主 ΔU 分The numerical values ​​are summarized and calculated to obtain the compensated output voltage value, which is then translated into the corresponding voltage command to control the output of the adjustable voltage power supply.

[0081] (6) The voltage drop compensation calculation and control module sends the generated corresponding voltage command to the adjustable voltage power supply;

[0082] (7) The adjustable voltage power supply executes the corresponding voltage command, outputs the executed feedback information, and sends the executed feedback information to the voltage drop compensation calculation and control module;

[0083] (8) The voltage drop compensation calculation and control module verifies the feedback information. If it does not conform to the voltage command information of the adjustable voltage power supply, the voltage drop compensation calculation and control module resends the corresponding voltage command to the adjustable voltage power supply. If it conforms, the voltage drop compensation calculation and control module sends the feedback information that the adjustable voltage power supply has executed to the host system.

[0084] The advantages of this invention are summarized as follows:

[0085] In existing technologies, with the development of power supply technology, power supplies with dynamically adjustable voltage are already in practical applications. However, in this invention, the power of a single load is not constant within a certain allowable voltage range, but rather its operating power varies with voltage changes. In other words, its power can be adjusted by voltage changes. Therefore, this invention can perfectly match the application of the load in this invention. For traditional loads, in practical applications, the cable cross-section is increased to control the voltage drop at the end within the specifications. However, this invention can compensate for the voltage drop without increasing the cable cross-section, thus reducing investment.

[0086] Furthermore, this invention dynamically analyzes and calculates line voltage drop for precise real-time compensation, ensuring voltage stability during power transmission and preventing voltage drops from affecting normal equipment operation. By reasonably increasing the source voltage, this invention allows for the selection of cables with smaller cross-sections for the same power supply distance and load power; or by increasing the source voltage, the original cable can achieve a longer power supply distance while still meeting voltage drop requirements for the same load power and cable cross-section, thereby reducing investment in long-distance power supply. This invention ensures that equipment on the power supply circuit operates under normal voltage, improving its service life and operational reliability. The higher the rated voltage, the better the effect of this invention. Attached Figure Description

[0087] Figure 1 This is a schematic diagram of the present invention;

[0088] Figure 2 This is a flowchart of the present invention.

[0089] Figure label:

[0090] 1. Adjustable voltage power supply; 101. Initial voltage U11 of the main cable (i.e., output voltage of the adjustable voltage power supply); 102. Voltage drop ΔU of the main cable. 主 103. Main cable end voltage U12, 11. Main cable, 111. Main cable resistivity ρ, 112. Main cable cross-sectional area S, 113. Main cable length L, 2. Intermediate switch, 201. Branch cable initial voltage U21 (consistent with 103. Main cable end voltage U12), 202. Branch cable voltage drop ΔU 分 203. Branch cable end voltage U22, 21. Branch cable, 211. Branch cable resistivity ρ', 212. Branch cable cross-sectional area S', 213. Branch length (distance between two loads) L', 3. Electrical load, 31. Single load power p, 32. Total number of loads l, 4. Total load power P. Detailed Implementation

[0091] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0092] It is important to note that the technical term "real-time calculation" in this invention refers to the immediate calculation of voltage drop based on existing cable and load parameters after each load change demand is issued. This is not the real-time monitoring or dynamic calculation commonly understood in this field. Furthermore, this technical term is clearly different from the "adaptive control system that collects, provides feedback, and adjusts closed-loop voltage through information from multiple components in the system loop" described in the prior art 6-CN111880598A in the background section of this invention. Specifically, the "real-time calculation" in this invention refers to purposeful and proactive compensation calculation under fixed parameters such as existing cables and loads. For example, when a 100% power command is issued, this invention calculates the compensation voltage under the 100% power target based on fixed parameters such as cables and loads and a predetermined compensation strategy formula, and then superimposes the compensation voltage on the power supply output. Similarly, when a 50% power command is issued, this invention calculates the compensation voltage under the 50% power target based on fixed parameters such as cables and loads and a predetermined compensation strategy formula, and then superimposes the compensation voltage on the power supply output. The compensation calculation and implementation actions of this invention are triggered by commands, and the calculation is a one-time event. It lacks an "adaptive control system that collects, feeds back, and adjusts closed-loop voltage through information acquisition and feedback from multiple components in the system loop," and does not collect other information. There is no control mechanism in this invention to compare, correct, or adjust the implementation results. Although calculations and implementations are performed in real-time based on each power command, it operates in a "post-command, forget" mode.

[0093] Unless otherwise defined or agreed upon, all installation methods, communication protocols, and technical terms mentioned in this invention are well-known technical terms in the relevant technical field and will not be explained further. Furthermore, the same reference numerals are used for the same components, but this does not affect, nor should it constitute, an accurate understanding of the technical solution by those skilled in the art.

[0094] Example 1:

[0095] Reference Figure 1-2This invention provides a long-distance power supply voltage drop compensation system, comprising: a first calculation module, which performs real-time calculations on parameters and load changes in the main cable circuit and obtains dynamic voltage drop calculation results; a second calculation module, which performs real-time calculations on parameters and load changes in the branch cable circuits and obtains dynamic voltage drop calculation results; an adjustable voltage power supply, which can adjust the source voltage; and a voltage drop compensation calculation control module. The system is characterized in that: the voltage drop compensation calculation control module separately summarizes the dynamic voltage drop calculation results from the first calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation control module separately summarizes the dynamic voltage drop calculation results from the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation control module summarizes the dynamic voltage drop calculation results from the first calculation module and the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results.

[0096] Furthermore, the first calculation module calculates the voltage drop of the main cable based on the rated power of the main cable. If the load power of the main cable changes during power supply, the first calculation module recalculates based on the changed load power of the main cable and transmits the calculation result to the voltage drop compensation calculation control module for summary calculation. The second calculation module calculates the voltage drop of the branch cables based on the rated power of the branch cables. If the load power of the branch cables changes during power supply, the second calculation module recalculates based on the changed load power of the branch cables and transmits the calculation result to the voltage drop compensation calculation control module for summary calculation.

[0097] Furthermore, during normal operation, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 The second calculation module calculates the voltage drop of the branch cable as ΔU. 分 Then the compensation voltage that the adjustable voltage power supply needs to increase is ΔU. 主 +ΔU 分 This is called full compensation.

[0098] Furthermore, if the power variation of a single load is controlled according to demand during the power supply process, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 The second calculation module calculates the voltage drop of the branch cable as ΔU. 分 The adjustable voltage power supply needs to increase the compensation voltage by ΔU. 主 '+ΔU分 (This is referred to as full compensation at this point).

[0099] Furthermore, if the voltage connected to the terminal load needs to be greater than 0.95U after compensation... 工作 U 工作 If the voltage is the operating voltage required by the load under its operating conditions, then the compensation voltage of the adjustable voltage power supply is set to ΔU. 欠补偿 Or ΔU 欠补偿 '(This is called undercompensation, ΔU)' 主 <ΔU 欠补偿 <ΔU 主 +ΔU 分 Alternatively, in the case of power adjustment, the compensation voltage can be set to ΔU. 主 '<ΔU 欠补偿 '<ΔU 主 '+ΔU 分 The minimum compensation principle for undercompensation is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 ).

[0100] It should be further explained that full compensation means that the current at the end of each branch reaches U. 工作 However, the voltage at the branch cable head is higher than the operating voltage, which may cause the load power at the head to exceed the limit by too much; only compensating for the voltage drop of the main cable, the voltage at the branch cable head reaches U 工作 However, if the voltage at the branch current terminal is lower than the operating voltage, the terminal load power may not reach the expected level. In this case, undercompensation falls within this range and includes the optimal solution. Furthermore, since general design specifications consider the terminal voltage drop to be ≤5%, the minimum compensation principle for undercompensation is that the voltage connected to the terminal load after compensation is greater than 0.95U. 工作 .

[0101] Furthermore, if only the load power of the main cable changes during the power supply process, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 主 ';

[0102] Furthermore, if only the load power of the branch cable changes during the power supply process, the second calculation module calculates the voltage drop of the branch cable as ΔU. 分 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 分 ';

[0103] Furthermore, the formula for calculating the voltage drop of the main cable is as follows:

[0104] , , ,

[0105] Main cable resistance (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0106] Main cable voltage drop (U) 工作 (This refers to the operating voltage corresponding to the required operating state of the load).

[0107] Where P is the total load power, I is the main cable current, R is the main cable resistance, ρ is the resistivity of the main cable material, L is the main cable length, S is the main cable cross-sectional area, and U... 工作 This refers to the operating voltage required by the load under its operating conditions.

[0108] The formula for calculating the voltage drop of the branch cable is as follows:

[0109] p=U 工作 I', I'=p / U 工作 U 工作= I'*R',

[0110] Resistance of each section of branch cable (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0111] The current for each load is I' = p / U 工作 .

[0112] The voltage drop of the branch cable is ΔU 分 =I'*R'* n*(n+1) / 2.

[0113]

[0114] Where p is the power of a single load, I' is the current of a single load, and R' is the resistance of each segment of the branch cable (between two loads). L' is the resistivity of the branch cable material, L' is the length of each segment of the branch cable (between two loads), S' is the cross-sectional area of ​​the branch cable, and n is the number of loads distributed on the branch cable.

[0115] If the load adjusts its power according to the working requirements during the power supply application, the voltage drop needs to be recalculated based on the total load power P and the individual load power p under the new state.

[0116] Ultimately, under the full compensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensated output voltage U11 to the operating voltage plus the full compensation voltage = U 工作 +ΔU 主 +ΔU 分After compensation, the voltage U22 connected to the terminal load is equal to U. 工作 .

[0117] Under the undercompensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensation output voltage U11, which is the working voltage plus the undercompensation voltage = U. 工作 +ΔU 欠补偿 (ΔUmain < ΔUundercompensated < ΔUmain + ΔUbranch), the minimum compensation principle is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 , (U 工作 It is the operating voltage corresponding to the required operating state of the load.

[0118] Ultimately, under the full compensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensated output voltage to the rated voltage U11 = U 工作 +ΔU 主 +ΔU 分 .

[0119] Under the undercompensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensation output voltage to the rated voltage U11=U 工作 +ΔU 欠补偿 (ΔUmain < ΔUundercompensated < ΔUmain + ΔUbranch), the minimum compensation principle is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 .

[0120] If the load adjusts its power according to the working requirements during the power supply application, the voltage drop needs to be recalculated based on the total load power P and the individual load power p under the new state.

[0121] The advantages of this invention are summarized as follows:

[0122] This invention dynamically analyzes and calculates line voltage drop, performing precise and real-time compensation to ensure voltage stability during power transmission and prevent voltage drops from affecting normal equipment operation. By reasonably increasing the source-end voltage, this invention allows for the selection of smaller cross-section cables for the same power supply distance and load power; or by increasing the source-end voltage, the original cable can achieve a longer power supply distance while still meeting voltage drop requirements for the same load power and cable cross-section, thereby reducing investment in long-distance power supply. This invention ensures that equipment on the power supply circuit operates under normal voltage, improving its service life and operational reliability. The higher the rated voltage, the better the effect of this invention.

[0123] Example 2:

[0124] like Figure 1 As shown

[0125] Adjustable voltage power supply 1 supplies power to branch cable 21 via main cable 11 and intermediate switch 2. n electrical loads are connected in parallel to branch cable 21. During the power supply process, a voltage drop ΔU is generated on main cable 11. 主 A voltage drop ΔU was generated on branch cable 21. 分 To ensure that the electrical load operates at the required operating voltage U 工作， It is necessary to compensate by increasing the output voltage U11 of the adjustable voltage power supply to offset the voltage drop on the cable.

[0126] The compensation is calculated as follows:

[0127] , , ,

[0128] Main cable resistance (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0129] Main cable voltage drop (U) 工作 It is the operating voltage corresponding to the required operating state of the load.

[0130] Where P is the total load power, I is the main cable current, R is the main cable resistance, ρ is the resistivity of the main cable material, L is the main cable length, S is the main cable cross-sectional area, and U... 工作 This refers to the operating voltage required by the load under its operating conditions.

[0131] The formula for calculating the voltage drop of the branch cable is as follows:

[0132] p=U 工作 I', I'=p / U 工作 U 工作= I'*R'

[0133] Resistance of each section of branch cable (A circuit requires a 2-core cable, so the resistance is calculated as twice the cable length.)

[0134] The current for each load is I' = p / U 工作 ;

[0135] The voltage drop of the branch cable is ΔU 分 =I'*R'* n*(n+1) / 2;

[0136]

[0137] Where p is the power of a single load, I' is the current of a single load, R' is the resistance of each segment of the branch cable (between two loads), ρ' is the resistivity of the branch cable material, L' is the length of each segment of the branch cable (between two loads), S' is the cross-sectional area of ​​the branch cable, and n is the number of loads distributed on the branch cable.

[0138] If the load adjusts its power according to the working requirements during the power supply application, the voltage drop needs to be recalculated based on the total load power P and the individual load power p under the new state.

[0139] Ultimately, under the full compensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensated output voltage U11 to the operating voltage plus the full compensation voltage = U 工作 +ΔU 主 +ΔU 分

[0140] Under the undercompensation strategy, the voltage drop compensation calculation and control module commands the adjustable voltage power supply 1 to increase the compensation output voltage U11, which is the working voltage plus the undercompensation voltage = U. 工作 +ΔU 欠补偿 The minimum compensation principle is that the voltage connected to the end load after compensation is greater than 0.95U. 工作 .

[0141] like Figure 2 As shown, the present invention also provides a method for a long-distance power supply voltage drop compensation system, which includes:

[0142] 1. The upper-level system issues control information;

[0143] 2. After receiving the control information, the voltage drop compensation calculation control module calculates the total load power P and the load operating voltage U after the control is executed. 工作 Single load power p;

[0144] 3. ΔU 主 The calculation section calculates ΔU based on data such as the total load P and the main cable parameters. 主 Numerical value;

[0145] 4. ΔU 分 The calculation section uses data such as single load p, branch cable parameters, and load distribution to determine ΔU. 分 Numerical value;

[0146] 5. The summary calculation section, based on the set compensation strategy requirements and combined with U... 工作 ΔU 主 ΔU 分 The numerical values ​​are summarized and calculated to obtain the compensated output voltage value, which is then translated into the corresponding voltage command to control the output of the adjustable voltage power supply.

[0147] 6. The voltage drop compensation calculation and control module sends the generated corresponding voltage command to the adjustable voltage power supply;

[0148] 7. The adjustable voltage power supply executes the corresponding voltage command, outputs the executed feedback information, and sends the executed feedback information to the voltage drop compensation calculation and control module.

[0149] 8. The voltage drop compensation calculation and control module verifies the feedback information. If it does not match the voltage command information of the adjustable voltage power supply, the voltage drop compensation calculation and control module resends the corresponding voltage command to the adjustable voltage power supply. If it matches, the voltage drop compensation calculation and control module sends the feedback information that the adjustable voltage power supply has executed to the upper system.

[0150] For those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0151] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-distance power supply voltage drop compensation system, comprising a first calculation module, wherein the first calculation module performs real-time calculations on parameters and load changes in the main cable circuit and obtains dynamic voltage drop calculation results; The second calculation module performs real-time calculations on the parameters and load changes in the cable circuit of the branch cable and obtains dynamic voltage drop calculation results; the adjustable voltage power supply can adjust the source voltage. The voltage drop compensation calculation and control module is characterized by: The voltage drop compensation calculation and control module separately summarizes the dynamic voltage drop calculation results of the first calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation and control module separately summarizes the dynamic voltage drop calculation results of the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results; or, the voltage drop compensation calculation and control module summarizes the dynamic voltage drop calculation results of the first calculation module and the dynamic voltage drop calculation results of the second calculation module and automatically controls the adjustable voltage power supply to perform dynamic voltage drop compensation based on the summarized calculation results.

2. The long-distance power supply drop compensation system as described in claim 1, characterized in that, The first calculation module calculates the load voltage drop of the main cable based on the rated power of the main cable. If the load power of the main cable changes during the power supply process, the first calculation module recalculates based on the changed load power of the main cable and transmits the calculation results to the voltage drop compensation calculation and control module for summary calculation. The second calculation module calculates the load voltage drop of the branch cable based on the rated power of the branch cable. If the load power of the branch cable changes during the power supply process, the second calculation module recalculates based on the changed load power of the branch cable and transmits the calculation results to the voltage drop compensation calculation and control module for summary calculation.

3. The long-distance power supply drop compensation system as described in claim 1, characterized in that, During normal operation, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 The second calculation module calculates the voltage drop of the branch cable as ΔU. 分 Then the compensation voltage of the adjustable voltage power supply is ΔU. 主 +ΔU 分 .

4. The long-distance power supply drop compensation system as described in claim 1, characterized in that, If the load power of the main cable changes during power supply, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 '; If the load power of the branch cable changes during power supply, the second calculation module calculates the voltage drop of the branch cable as ΔU. 分 The adjustable voltage power supply needs to increase the compensation voltage by ΔU. 主 '+ΔU 分 '.

5. A long-distance power supply drop compensation system as described in claim 4, characterized in that, If the voltage connected to the end load after compensation is greater than 0.95*U 工作 , among which, U 工作 Given the operating voltage of the load at the required power, the undercompensated voltage that the adjustable voltage power supply needs to boost is set to ΔU. 主 <Undercompensated voltage<ΔU 主 +ΔU 分 Alternatively, in the case of power adjustment, the compensation voltage can be set to ΔU. 主 < Undercompensated voltage < ΔU 主 '+ΔU 分 '.

6. The long-distance power supply drop compensation system as described in claim 1, characterized in that, If only the load power of the main cable changes during the power supply process, the first calculation module calculates the voltage drop of the main cable as ΔU. 主 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 主 '.

7. A long-distance power supply drop compensation system as described in claim 1, characterized in that, If only the load power of the branch cable changes during the power supply process, the second calculation module calculates the voltage drop of the branch cable as ΔU. 分 'Then the adjustable voltage power supply needs to increase the compensation voltage by ΔU.' 分 '.

8. A method for using a long-distance power supply drop compensation system as described in any one of claims 1-7, characterized in that, The method includes the following steps: (1) The upper-level system issues control information; (2) After receiving the control information, the voltage drop compensation calculation control module calculates the total load power P and the load operating voltage U after the control is executed. 工作 Single load power p; (3) Voltage drop ΔU of main cable 主 The calculation section calculates the voltage drop ΔU of the main cable based on the total load power P and the main cable parameters. 主 Numerical value; (4) Branch cable voltage drop ΔU 分 The calculation section calculates the voltage drop ΔU of the branch cable based on the single load power p, branch cable parameters, and load distribution. 分 Numerical value; (5) The summary calculation section, based on the set compensation strategy requirements and combined with U 工作 , ΔU 主 , ΔU 分 The numerical values ​​are summarized and calculated to obtain the compensated output voltage value, which is then translated into the corresponding voltage command to control the output of the adjustable voltage power supply. (6) The voltage drop compensation calculation and control module sends the generated corresponding voltage command to the adjustable voltage power supply; (7) The adjustable voltage power supply executes the corresponding voltage command, outputs the executed feedback information, and sends the executed feedback information to the voltage drop compensation calculation and control module; (8) The voltage drop compensation calculation and control module verifies the feedback information. If it does not conform to the voltage command information of the adjustable voltage power supply, the voltage drop compensation calculation and control module resends the corresponding voltage command to the adjustable voltage power supply. If it conforms, the voltage drop compensation calculation and control module sends the feedback information that the adjustable voltage power supply has executed to the host system.

Images