CN-122021239-A - Whole cabinet water-cooling waterway flow distribution method and system based on pressure loss analysis

CN122021239ACN 122021239 ACN122021239 ACN 122021239ACN-122021239-A

Abstract

The invention provides a method and a system for distributing water-cooling waterway flow of a whole cabinet based on pressure loss analysis. And secondly, calculating the comprehensive heat threat level of each power module by predicting the heat generation trend of each power module and determining the target cooling flow. And then, carrying out feedforward compensation on the target flow by combining the fluid transmission delay in the hydraulic dynamic model, and generating a final execution flow instruction. The core step is that the hydraulic dynamic model is called to reversely calculate the execution flow instruction into the target pressure loss value of each branch, and the real-time pressure loss is matched with the target pressure loss by controlling each branch regulating valve in a closed loop mode. According to the invention, the predictive distribution of the cooling flow of each branch is realized by taking the pressure loss as a control target, so that the heat management efficiency and reliability of the water cooling system are improved.

Inventors

WANG MIN
CHEN RONGQIANG
HUANG BOLIN
HU XINYANG
WU MEINA

Assignees

武汉大全能源技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251217

Claims (10)

1. The whole cabinet water-cooling waterway flow distribution method based on the pressure loss analysis is characterized by comprising the following steps of: On-line excitation is carried out on each parallel cooling branch in the whole water cooling system of the electrical cabinet, and a hydraulic dynamic model for representing the dynamic relation between the pressure loss and the flow of each cooling branch is built according to the pressure loss response of each cooling branch; The heat generation trend of each power module is obtained by analyzing the real-time electrical parameters and the future electrical operation instructions of the power module corresponding to each cooling branch; combining the heat generation trend and the real-time electrical appliance parameters to calculate a comprehensive heat threat level for the power module, and determining the target cooling flow of the corresponding cooling branch based on the comprehensive heat threat level; performing feedforward compensation on the target cooling flow by combining fluid transmission delay calibrated in the hydraulic dynamic model and a future electrical operation instruction to generate an execution flow instruction after flow compensation; And calling a hydraulic dynamic model to reversely calculate the execution flow instructions into target pressure loss values of all cooling branches, and matching the real-time pressure loss values of all cooling branches with the target pressure loss values by controlling the regulating valves of all cooling branches in a closed loop.
2. The method for distributing water-cooling waterway flow of the whole cabinet based on pressure loss analysis according to claim 1, wherein the method for on-line excitation of each parallel cooling branch in the water-cooling system of the whole cabinet of the electric cabinet and establishing a hydraulic dynamic model representing the dynamic relation between the pressure loss and flow of each cooling branch according to the pressure loss response of each cooling branch comprises the following steps: Injecting a preset pseudo-random binary sequence disturbance signal into a regulating valve of each parallel cooling branch in the whole water cooling system of the electrical cabinet to be used as on-line excitation; For any cooling branch, synchronously acquiring disturbance signals of the regulating valve in response to on-line excitation and pressure loss response data measured by a pressure difference sensor preset by the cooling branch; obtaining impulse response of the cooling branch by calculating a cross-correlation function of the disturbance signal and the pressure loss response data; and fitting a transfer function comprising fluid transmission delay, fluid inertia and fluid damping coefficient according to the impulse response, and taking the transfer function as a hydraulic dynamic model for representing the dynamic relation between the pressure loss and the flow of the cooling branch.
3. The method for distributing the water-cooling waterway flow of the whole cabinet based on the pressure loss analysis according to claim 1, further comprising the following steps after the hydraulic dynamic model for representing the pressure loss and flow dynamic relation of each cooling branch is built according to the pressure loss response of each cooling branch: calculating theoretical pressure loss values of all cooling branches according to the hydraulic dynamic model and the current operation parameters of the water cooling system; Comparing the theoretical pressure loss value with the real-time pressure loss value of the cooling branch to generate a pressure loss residual error; Performing time domain trend analysis on the pressure loss residual error, and quantifying an analysis result of the time domain trend analysis to generate a waterway health coefficient of the cooling branch; when the waterway health coefficient of any cooling branch is lower than a preset health threshold, triggering fault early warning.
4. The method for distributing water-cooled waterway flow of a whole cabinet based on pressure loss analysis according to claim 3, wherein the time domain trend analysis of the pressure loss residual error comprises the following steps: Carrying out Kalman filtering treatment on the pressure loss residual error, and calculating the average value and the slope of the filtered pressure loss residual error by adopting a sliding window; If the slope is continuously positive in a plurality of continuous time windows and exceeds a preset slope threshold, judging that the analysis result of the time domain trend analysis is that the pressure loss residual error is gradually increased; if the change of the absolute value of the mean value between adjacent time windows exceeds a preset mutation threshold, judging that the analysis result of the time domain trend analysis is that the pressure loss residual error has mutation.
5. The method for distributing water-cooled waterway flow of a whole cabinet based on pressure loss analysis according to claim 3, wherein the real-time electrical parameters include output current, switching frequency and current change rate, the combined heat generation trend and the real-time electrical parameters are calculated for the power module to obtain a comprehensive heat threat level, and determining the target cooling flow of the corresponding cooling branch based on the comprehensive heat threat level comprises the following steps: Taking the square of the output current as a basic heat threat value, adding a switching loss weight according to the switching frequency as the basic heat threat value, and adding a dynamic impact multiplier according to the current change rate as the basic heat threat value; Integrating the basic heat threat value added with the switching loss weight and the dynamic impact multiplier into a comprehensive heat threat level through weighted summation; and carrying out nonlinear programming solution by taking the power module temperature rise which maximally reduces the comprehensive heat threat level and exceeds the preset level threshold and the total hydraulic power loss of the minimized water cooling system as an optimization target to obtain the target cooling flow of each cooling branch.
6. The method for distributing water-cooling waterway flow of a whole cabinet based on pressure loss analysis according to claim 5, wherein the steps of performing nonlinear programming solution by using the power module temperature rise which maximally reduces the comprehensive heat threat level and exceeds the preset level threshold and minimizing the total hydraulic power loss of the water-cooling system as an optimization target to obtain the target cooling flow of each cooling branch comprise the following steps: Establishing a pressure loss cost function taking flow as an independent variable and pressure loss as a dependent variable for each cooling branch based on the hydraulic dynamic model; constructing an optimization objective for the pressure loss cost function comprising a benefit term and a cost term, the benefit term being related to the integrated heat threat level and the flow, the cost term being related to the flow and the pressure loss cost function; Taking the upper limit of the total flow of the water cooling system and the water path health coefficient of the cooling branch as constraint conditions of an optimization target; And solving an optimization target by adopting a sequence quadratic programming algorithm to obtain an optimal solution meeting constraint conditions, and taking the optimal solution as a target cooling flow of each cooling branch.
7. The method for distributing the water-cooled waterway flow of the whole cabinet based on the pressure loss analysis according to claim 1, wherein the step of performing feedforward compensation on the target cooling flow by combining the fluid transmission delay calibrated in the hydraulic dynamic model and the future electric operation instruction to generate the flow-compensated execution flow instruction comprises the following steps: Identifying whether a load step type thermal shock event exists from an incoming electrical work instruction; if a thermal shock event exists, extracting fluid transmission delay of a cooling branch from the hydraulic dynamic model, and calculating instruction prospective time of a future electric operation instruction; Synthesizing a target flow waveform for feedforward compensation based on the thermal shock event and including an initial overshoot and a subsequent steady state value; The starting time point of the target flow waveform is set to be a preset time which is determined by the fluid transmission delay and the command look-ahead time before the occurrence of the thermal shock event, and the execution flow command is generated by combining the target flow waveform and the starting time point.
8. The method for distributing the water-cooling waterway flow of the whole cabinet based on the pressure loss analysis according to claim 1, wherein the step of invoking the hydraulic dynamic model to reversely calculate the execution flow command into the target pressure loss value of each cooling branch, and matching the real-time pressure loss value of each cooling branch with the target pressure loss value by controlling the regulating valve of each cooling branch in a closed loop comprises the following steps: judging whether the execution flow instruction is a static flow value or a dynamic flow waveform; if the static flow value is the static flow value, a static target pressure loss value is reversely calculated through a hydraulic dynamic model; If the dynamic flow waveform is the dynamic flow waveform, the dynamic target pressure loss waveform is reversely calculated through a hydraulic dynamic model; and taking the target pressure loss value or the target pressure loss waveform as control setting input of each cooling branch, and continuously adjusting the opening of the cooling branch regulating valve by adopting a PID control algorithm according to the pressure loss deviation of the real-time pressure loss value and the control setting input until the pressure loss deviation is converged within a preset error range.
9. The whole cabinet water-cooling waterway flow distribution system based on the pressure loss analysis comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and is characterized in that the whole cabinet water-cooling waterway flow distribution method based on the pressure loss analysis as claimed in any one of claims 1 to 8 is realized when the processor executes the computer program.
10. A computer readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to be configured to perform the method of whole cabinet water cooling waterway flow distribution based on pressure loss analysis of any of claims 1 to 8.

Description

Whole cabinet water-cooling waterway flow distribution method and system based on pressure loss analysis Technical Field The invention belongs to the technical field of electric cabinet heat dissipation, and particularly relates to a method and a system for distributing flow of a whole cabinet water-cooling waterway based on pressure loss analysis. Background The power density of the frequency converter, the high-power supply and other electrical cabinets is continuously improved along with the rapid development of the power electronics technology, so that the power module inside the power cabinet generates huge heat during operation. And the whole cabinet water cooling system in the electric cabinet can ensure that the core devices work in a safe temperature range, and in the whole cabinet water cooling system, cooling liquid is distributed to a plurality of parallel cooling branches by a main pipeline and respectively flows through different power modules to exchange heat. The ideal thermal management requires that the cooling system can accurately and dynamically distribute cooling flow to each branch as required, namely, the module with large heating value obtains more flow, and the module with small heating value correspondingly reduces, thereby realizing efficient and energy-saving heat dissipation. However, the conventional control method of the water cooling system is generally based on temperature feedback, that is, after detecting that the temperature of a certain module is too high, the valve opening of the corresponding branch is passively adjusted. The fundamental drawback of this method is the great inertia of the thermal system, the heat has already accumulated significantly inside the module when the temperature sensor detects an anomaly, the control regulation is severely retarded, which easily leads to local temperature overruns. Disclosure of Invention The invention provides a method and a system for distributing water-cooling waterway flow of a whole cabinet based on pressure loss analysis, which are used for solving the technical problems. In a first aspect, the invention provides a method for distributing flow of a water-cooling waterway of a whole cabinet based on pressure loss analysis, which comprises the following steps: On-line excitation is carried out on each parallel cooling branch in the whole water cooling system of the electrical cabinet, and a hydraulic dynamic model for representing the dynamic relation between the pressure loss and the flow of each cooling branch is built according to the pressure loss response of each cooling branch; The heat generation trend of each power module is obtained by analyzing the real-time electrical parameters and the future electrical operation instructions of the power module corresponding to each cooling branch; combining the heat generation trend and the real-time electrical appliance parameters to calculate a comprehensive heat threat level for the power module, and determining the target cooling flow of the corresponding cooling branch based on the comprehensive heat threat level; performing feedforward compensation on the target cooling flow by combining fluid transmission delay calibrated in the hydraulic dynamic model and a future electrical operation instruction to generate an execution flow instruction after flow compensation; And calling a hydraulic dynamic model to reversely calculate the execution flow instructions into target pressure loss values of all cooling branches, and matching the real-time pressure loss values of all cooling branches with the target pressure loss values by controlling the regulating valves of all cooling branches in a closed loop. Optionally, the on-line excitation is performed on each parallel cooling branch in the whole water cooling system of the electrical cabinet, and a hydraulic dynamic model for representing the dynamic relationship between the pressure loss and the flow of each cooling branch is built according to the pressure loss response of each cooling branch, which comprises the following steps: Injecting a preset pseudo-random binary sequence disturbance signal into a regulating valve of each parallel cooling branch in the whole water cooling system of the electrical cabinet to be used as on-line excitation; For any cooling branch, synchronously acquiring disturbance signals of the regulating valve in response to on-line excitation and pressure loss response data measured by a pressure difference sensor preset by the cooling branch; obtaining impulse response of the cooling branch by calculating a cross-correlation function of the disturbance signal and the pressure loss response data; and fitting a transfer function comprising fluid transmission delay, fluid inertia and fluid damping coefficient according to the impulse response, and taking the transfer function as a hydraulic dynamic model for representing the dynamic relation between the pressure loss and the flow of the cooling branch