CN109856489B - Load simulation device and method for testing performance of direct current power supply system - Google Patents
Load simulation device and method for testing performance of direct current power supply system Download PDFInfo
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Abstract
The invention provides a load simulation device and a method for testing the performance of a direct current power supply system, wherein the performance of the direct current power supply system is tested by utilizing the load simulation device comprising an input module, a load simulation circuit and a control module, wherein the topological circuit of the load simulation device adopts a topological structure with high stability, the problems of large application limitation, low stability margin and easiness in damage of the traditional load simulation device are solved, the structural cost and the operation cost of the device are effectively reduced, and meanwhile, the applicability of the load simulation device is improved.
Description
Technical Field
The invention relates to the technical field of performance testing, in particular to a load simulation device and a method for testing the performance of a direct current power supply system.
Background
In order to evaluate the reliability of the technical structure and the operation mechanism of the existing micro-grid power supply system, the related performance of the micro-grid power supply system needs to be tested by using reliable loads, and the test needs to be carried out based on the distribution data of the actual loads to obtain a reliable evaluation result. However, in a microgrid system, power generation proportions of power supply systems, particularly direct current power supply systems such as renewable energy power generation and the like, in each time period are different, load data also change in real time, and in order to shorten a test period and reduce development cost, a main research direction is currently performed when a performance test of the microgrid power supply system is realized based on a simulated load.
The traditional load simulation device realizes the simulation of the demand load mostly according to the basic inductance and the variable resistor, the load which can be simulated by the topological structure has large limitation and cannot be well applied to projects with high-power demands, and the topological circuit structure of the traditional load simulation device has low stability margin, is easy to oscillate and damage a circuit, is not suitable for being applied to the technology for testing the performance of a power supply system, and cannot effectively and reliably obtain the performance test result of the micro-grid direct-current power supply system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a load simulation apparatus and a method for testing the performance of a dc power supply system, and the following technical solutions are described.
In one embodiment, the apparatus comprises:
the load simulator comprises an input module, a load simulation device and a control module, wherein one end of the input module is connected with the output side of a direct current power supply system and is used for transmitting the electric energy of the direct current power supply system to the load simulation device;
the input end of the load simulation circuit is connected with the other end of the input module and used for simulating and generating a test load so as to consume the electric energy of the direct current power supply system;
and the control module is connected with the load simulation circuit and is used for controlling the simulation load value generated by the load simulation circuit.
Preferably, the load simulation circuit includes:
the inductor (L), a first resistor (R1) connected with the inductor (L), a second resistor (R2) connected with the first resistor (R1), a power tube (T) connected with the second resistor (R2), and a first capacitor (C1) connected with the second resistor (R2) and the power tube (T) in parallel.
Further, the load simulation circuit further includes:
the rectifying circuit is connected with the second resistor (R2) in parallel, forms a loop with the additional inductance of the second resistor (R2) and the second resistor (R2), and is used for absorbing the energy of the additional inductance of the second resistor (R2) and protecting the circuit;
the rectifier circuit includes: a first diode (D1).
Further, the load simulation circuit further includes:
the buffer circuit is connected with the power tube (T) in parallel and used for buffering the energy of the power tube and protecting the power tube;
the buffer circuit includes: a second diode (D2), a second capacitor (C2) connected to the second diode (D2), and a third resistor (R3) connected in parallel with the second capacitor (C2).
In another embodiment, the apparatus further comprises:
the temperature adjusting module is connected with the load simulation circuit and is used for monitoring and adjusting the temperature of the load simulation circuit;
wherein the temperature adjustment module comprises:
the temperature sensor is used for acquiring temperature data of the load simulation circuit in real time;
the controller is connected with the temperature sensor and used for carrying out analog-to-digital conversion on the temperature data acquired by the temperature sensor, comparing the digital signal of the temperature data obtained by conversion with a preset temperature threshold value and selectively outputting an instruction signal for controlling the fan to be turned on or turned off according to the comparison result;
the amplifying circuit is connected with the output end of the controller and is used for amplifying the instruction signal sent by the controller;
and the fan is connected with the amplifying circuit through a relay and used for adjusting the temperature of the load simulation circuit according to the command signal of the controller.
Preferably, the input module includes: one end of the main control switch is connected with the output side of the direct current power supply system, and the other end of the main control switch is connected with the input end of the load simulation circuit and used for controlling the on-off of the electric energy transmission of the direct current power supply system;
the protection circuit is specifically connected between the main control switch and the load analog circuit and is used for performing overcurrent protection and leakage protection on the load analog circuit;
the protection circuit includes a circuit breaker and a fuse connected to the circuit breaker.
Preferably, the control module comprises:
the input end of the voltage and current collector is connected with the load analog circuit and is used for collecting voltage and current data of the load analog circuit in real time;
the upper computer module is connected with the voltage and current collector and is used for generating a control signal according to the voltage and current data collected by the voltage and current collector and the required voltage and current data from the external terminal equipment;
and the lower computer module is connected between the upper computer module and the load simulation circuit and is used for processing the control signal and transmitting the control signal to the load simulation circuit.
Further, the control module further comprises: the manual control module is connected with the lower computer module and used for generating a control signal of a load simulation circuit in a simulation mode;
specifically, the manual control module includes:
the manual control panel is used for manually inputting required load simulation data;
and the potentiometer is connected with the manual control panel and is used for generating a control signal of the load simulation circuit according to the required load simulation data in a simulation mode.
Further, the upper computer module comprises:
the communication interface is connected with the voltage and current collector and the external terminal equipment and used for receiving voltage and current data from the voltage and current collector and required voltage and current data of the external terminal equipment;
the PID controller is connected with the communication interface and is used for calculating according to the voltage and current data of the voltage and current collector and the required voltage and current data of the external terminal equipment to generate a control signal of the load analog circuit;
the display unit is connected with the communication interface and used for displaying the voltage and current data collected by the voltage and current collector to a user;
and the data backup unit is connected with the communication interface and is used for storing the voltage and current data and the historical control data acquired by the voltage and current acquisition unit.
The lower computer module comprises:
the PWM generating circuit is connected with the PID controller and is used for coding control signals from the upper computer module and the manual control module;
and the PWM driver is connected with the PWM generating circuit and is used for amplifying the coded control signal.
In addition, the invention also provides a method for testing the performance of the direct current power supply system, which comprises the following steps:
determining power supply test data according to historical power utilization data of a preset time period;
controlling the load simulation device in one or more embodiments to simulate and generate a test load according to the power supply test data, and testing the direct current power supply system to be tested according to the test load by using the load simulation device;
and recording the power supply data and the equipment state of the direct current power supply system to be tested corresponding to each power supply test data, and determining the performance test result of the direct current power supply system to be tested.
Compared with the closest prior art, the invention also has the following beneficial effects:
according to the load simulation device and the method for testing the performance of the direct current power supply system, the performance of the direct current power supply system is tested through the load simulation device comprising the input module, the load simulation circuit and the control module, wherein the load simulation device adopts a topological structure with high surge prevention capacity, the problems that the load simulation device in the prior art is low in stability margin and easy to damage are solved, the operation cost of the load simulation device is effectively reduced, meanwhile, the applicability of the load simulation device to the performance test work of the direct current power supply system is improved, and the optimization design and development of the direct current power supply system of a micro-grid are facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a load simulator according to an embodiment of the present invention;
fig. 2 is a circuit topology structure diagram of a first exemplary load simulation circuit according to a first embodiment of the present invention;
FIG. 3 is a circuit topology diagram of a second exemplary load simulation circuit according to a first embodiment of the present invention;
fig. 4 is a circuit topology structure diagram of a third exemplary load simulation circuit in the first embodiment of the present invention;
FIGS. 5-a to 5-c are schematic diagrams of simulation results of a load simulation circuit;
FIG. 6 is a circuit topology structure diagram of an input module according to an embodiment of the present invention;
FIG. 7 is a schematic block diagram of a first exemplary control module according to a first embodiment of the present invention;
FIG. 8 is a schematic block diagram of a second exemplary control module according to a first embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a load simulator according to a second embodiment of the present invention;
fig. 10 is a flowchart of a method for testing the performance of the dc power supply system according to an embodiment of the present invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, unless otherwise conflicting, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.
At present, load simulation devices applied to small-power equipment account for the majority, the topological structure of the load simulation devices cannot meet the load simulation requirements of high load and high change frequency, and a plurality of devices are required to be connected in series and in parallel when the load simulation devices are applied to high-power projects. In addition, the traditional load simulation device has insufficient circuit structure stability margin and low simulation result accuracy, and cannot be well applied to the direct current power supply system test engineering or other large-scale technical activities of the microgrid. In view of the above, embodiments of the present invention provide a load simulation apparatus and a method for testing performance of a dc power supply system, and various embodiments of the present invention are described below with reference to the accompanying drawings.
Example one
Fig. 1 is a schematic structural diagram of a load simulator according to a first embodiment of the present invention, and the present invention is described below with reference to fig. 1.
As can be seen with reference to fig. 1, the apparatus comprises the following modules: an input module 11, a load simulation circuit 13 and a control module 15.
The input module 11 has one end connected to an output side of the dc power supply system 17, and is configured to transmit electric energy of the dc power supply system 17 to the load simulation apparatus 10. And the input end of the load simulation circuit 13 is connected with the other end of the input module 11 and is used for simulating and generating a test load so as to consume the electric energy of the direct current power supply system 17. And a control module 15 connected to the load simulation circuit 13 for controlling the simulated load value generated by the load simulation circuit 13.
In order to enable the load simulation apparatus of the present invention to satisfy the operating environment of the dc power supply system in the actual working condition, the load simulation circuit 13 of the present invention adopts a structure different from that of the conventional load simulator, and fig. 2 shows a circuit topology structure diagram of a first exemplary load simulation circuit in the first embodiment of the present invention.
As shown in fig. 2, the load simulation circuit 13 of the present invention includes: the circuit comprises an inductor L, a first resistor R1 connected with the inductor L, a second resistor R2 connected with the first resistor R1, a power tube T connected with the second resistor R2, and a first capacitor C1 connected with the second resistor R2 and the power tube T in parallel.
The inductor L can limit overlarge starting impact current; the first resistor R1 is used as a load of the circuit, consumes electric energy, and forms an RLC circuit with the inductor L and the first capacitor C1, so that the inductor L can be effectively prevented from oscillating in the process of charging the first capacitor C1; the first capacitor C1 is used as an output capacitor to stabilize the output voltage, and the power transistor T1 is used to adjust the output power of the load simulation circuit.
In practical conditions, the structure can be selected according to requirements, in this example, the power tube T can be selected from an IGBT module ISP 0115T. As shown in fig. 2, the collector of the power transistor T is connected to the second resistor R2, and the emitter of the power transistor T is connected to the first capacitor C1.
The load simulation circuit in the example is provided with the second resistor R2, the second resistor R2 is connected with the first resistor R1 and then connected with the power tube T, the influence of surge impact on the circuit is effectively reduced, the stability margin of the load simulation circuit is improved, the working requirements of high power and low power can be met simultaneously, the universality is higher, and the stable operation of the load simulation device is facilitated.
In an actual situation, the second resistor R2 cannot avoid the existence of an inductor, and a high voltage occurs in the turn-off process of the power tube T, so that the power tube T is broken down, and the circuit cannot normally operate.
Fig. 3 is a circuit topology diagram of a second exemplary load simulation circuit according to a first embodiment of the present invention. Here, the structure similar to the load simulation circuit in the first example is not described again, and only the difference structural features will be described.
As can be seen from fig. 3, the load simulation circuit in this example further includes: and the rectifying circuit is connected with the second resistor R2 in parallel, forms a loop with the additional inductance of the second resistor R2 and the additional inductance of the second resistor R2, and is used for absorbing the energy of the additional inductance of the second resistor R2 and protecting the circuit.
Specifically, the rectifier circuit includes: the first diode D1 is connected in inverse parallel to two ends of the second resistor R2, the first diode D1 is used as a rectifier, and forms a loop with the second resistor R2 and the additional inductor of the resistor R2 to absorb the energy of the inductor.
The load simulation circuit in the example is provided with the rectifying circuit, the energy of the additional inductance of the second resistor R2 in the circuit is ingeniously consumed by adopting a simple structural design, the probability of circuit damage is effectively reduced, and the resource consumption in the operation process of the load simulation circuit is reduced to a certain extent.
Fig. 4 is a circuit topology structure diagram of a third exemplary load simulation circuit according to the first embodiment of the present invention. The structures similar to the load simulation circuits in the first example and the second example are not repeated here, and only the difference structural features will be described.
As can be seen from fig. 4, the load simulation circuit in this example further includes: and the buffer circuit is connected with the power tube T in parallel and is used for buffering the energy of the power tube, protecting the power tube and reducing the electromagnetic interference. Specifically, the buffer circuit includes: the power transistor comprises a second diode D2, a second capacitor C2 connected with a second diode D2, and a third resistor R3 connected with the second capacitor C2 in parallel, wherein the anode of the second diode is connected with the collector of the power transistor T, and the cathode of the second diode is connected with the second capacitor.
Based on the reliability of the load simulation circuit topological structure, the method and the device can be used for comparing and verifying the results of the corresponding mathematical model and the simulation circuit. The specific algorithm of the mathematical model is as follows.
The topological structure of the load simulation circuit is mathematically analyzed by using a state space averaging method:
at 0 < t < DrDuring the period T, the power switch T is turned on, the output voltage V of the DC power supply system charges the first capacitor C1 through the inductor L and the first resistor R1, and the first capacitor C1 supplies power to the load resistor and the second resistor R2. Wherein T is the time of the operation of the load simulation circuit, T is the time of a topology analysis period, DrFor the current duty cycle of the load simulation circuit, the state space equation of the circuit is as follows:
where v (t) is the voltage across the inductor L at time t, LLAs an inductance value, iL(t) is the current of the inductor L at time t, VC1(t) is the voltage across the first capacitor C1 at time t, iC1(t) is the current across the first capacitor C1 at time t, CC1Is the capacitance value of the first capacitor C1.
The current flow in the load simulation circuit at this time is:
the current flows to 1: dc power supply system → L → R1 → R2 → T → dc power supply system;
the current flows to 2: c1 → R2 → T → C1;
at DrDuring the period T < T < T, the power switch T1 is turned off, the output voltage V of the DC power supply system charges the first capacitor C1 through the inductor L and the first resistor R1, and at the moment, the state space equation of the circuit is as follows:
at this time, the current of the load simulation circuit flows as follows:
the current flows to: dc power supply system → L → R1 → C1 → dc power supply system;
according to the conservation principle of volt-second, the voltage at two ends of the inductor in one period T is 0, the current flowing through the capacitor is 0, and then:
the output power P and the duty ratio D of the load analog circuit can be obtained according to the formularThe relationship of (1) is:
substituting the above formula (6) can obtain:
wherein r isR2Is the resistance value, R, of the second resistor R2R1The resistance value of the first resistor R1 is P, which is the output power of the load simulation circuit.
Verification is performed by providing several assumed parameters with reference to data in actual conditions, for example, assuming that the parameters in the circuit are:
V＝360V，lL＝1mH,R1＝3Ω，cC1＝1000Uf，rR2＝3Ω，Dr＝0.5；
according to the formula (6)
Substituting V into equation (9) to obtain P14400W, where V is 240.
The simulation circuit of the load simulation circuit may then be built using a suitable simulation circuit building tool or structure, for example using a simulink. FIG. 5 is a graph showing simulation results of a load simulation circuit, in which the instantaneous current across the simulation circuit R2 and the instantaneous voltage across R2 are shown in FIG. 5-a, respectively; the average current across the simulation circuit R2 and the average voltage across the simulation circuit R2 can be obtained by performing an averaging operation according to the instantaneous current across R2 and the instantaneous voltage across R2, respectively, as shown in fig. 5-b, wherein, referring to the data in fig. 5: the average current value of the two ends of R2 is 40A, and the starting process is smooth and has no overshoot; the average voltage value of the two ends of R2 is 240V, and the starting process has certain impact, but only exceeds 50% of the rated voltage; fig. 5-c show the output power diagram of the simulation circuit, and it can be known from the data in fig. that the output power of the simulation circuit is approximately equal to 14400W, and the simulation result is consistent with the theoretical calculation result, so that it can be obtained that the topology structure of the load simulation circuit in the embodiment of the present invention is reliable.
According to the above and the verification results, the load simulation circuit in this example is provided with the buffer circuit for buffering the energy of the power tube, and the power tube is effectively protected by adopting a simple circuit structure, so that the damage probability of important elements in the circuit is remarkably reduced on the basis of not increasing the cost. In addition, the load simulation circuit adopts the topological structure to weaken the complexity of a control algorithm, and when circuit parameters such as resistance, capacitance, inductance and the like in the load simulation circuit are known, the output power can be continuously adjusted only by adjusting the duty ratio. In practical application, the power tube is used for controlling, so that the reliability is high, and the problem of abrasion of the control contact of the traditional relay can be solved.
Fig. 6 shows a circuit topology structure diagram of an input module in a first embodiment of the present invention, and as can be seen from fig. 6, the input module of the load simulation apparatus in this embodiment includes: and one end of the main control switch 61 is connected with the output side of the direct current power supply system, the other end of the main control switch is connected with the input end of the load simulation circuit, and the main control switch is used for controlling the on-off of the electric energy transmission of the direct current power supply system, is closed, transmits the electric energy of the direct current power supply system to the load simulation circuit, is opened, and stops transmitting the electric energy of the direct current power supply system to the load simulation circuit.
In combination with actual conditions, the input module may further include: the protection circuit is connected between the main control switch and the load analog circuit and used for performing overcurrent protection and leakage protection on the load analog circuit, and the fault circuit can be cut off rapidly in time when a system fails, so that the accident is prevented from being enlarged, and the safe operation of the system is ensured. The protection circuit includes a circuit breaker 63 and a fuse connected to a circuit breaker 65. According to the embodiment of the invention, the input module comprising the protection circuit is adopted to connect the direct current power supply system with the load simulation circuit, so that the protection action can be timely carried out on the circuit according to the user requirement or when abnormity occurs while controlling the transmission of the electric energy of the direct current power supply system, and the larger loss caused by the damage to the whole circuit is avoided.
Fig. 7 is a schematic structural diagram of a first exemplary control module according to a first embodiment of the present invention, and as shown in fig. 7, the control module includes: a voltage current collector 71, an upper computer module 73 and a lower computer module 75.
A voltage and current collector 71, the input end of which is connected with the load analog circuit 13, and is used for collecting the voltage and current data of the load analog circuit in real time and performing analog-to-digital conversion on the collected data; in actual conditions, an appropriate data acquisition structure can be selected according to requirements, such as a data acquisition card of a Texas instrument.
The upper computer module 73 is connected with the voltage and current collector 71 and is used for generating a control signal according to the voltage and current data collected by the voltage and current collector 71 and the required voltage and current data from the external terminal equipment;
and the lower computer module 75 is connected between the upper computer module 73 and the load simulation circuit 13 and is used for processing the control signal and transmitting the control signal to the load simulation circuit 13.
Fig. 8 shows a schematic structural diagram of a second exemplary control module in a first embodiment of the present invention, where a structure similar to that of the first exemplary control module is not repeated here, and only difference structural features are explained, as shown in fig. 8, the second exemplary control module may further include: and the manual control module 81 is connected with the lower computer module 75 and used for simulating and generating the control signal of the load simulation circuit 13. The manual control module 81 includes: and the manual control panel is used for manually inputting required load simulation data. And the potentiometer is connected with the manual control panel and is used for generating a control signal of the load simulation circuit according to the required load simulation data in a simulation mode.
In practical application, a user sets required current and power through a knob and an instrument on a manual control panel in combination with a potentiometer to generate an analog signal, then the analog signal is transmitted to a load analog circuit through a lower computer module, the load analog circuit works in an open-loop control mode, and the current or the power corresponding to a set value of the user is output. Or the user directly combines the data monitoring software on the PC to set the dynamic load curve of the required load, and the load simulation circuit works in a closed-loop control mode to simulate the dynamic load. The data monitoring software can be conventional tool software with functions of manual input, electronic forms, text files, drawing and the like.
Specifically, the upper computer module 73 includes: and the communication interface is connected with the voltage and current collector and the external terminal device and is used for receiving voltage and current data from the voltage and current collector 71 and required voltage and current data of the external terminal device, wherein the voltage and current collector 71 transmits the voltage and current data to the upper computer module 73 through the USB interface. And the PID controller is connected with the communication interface and is used for calculating according to the voltage and current data of the voltage and current collector 71 and the required voltage and current data of the external terminal equipment to generate a control signal of the load analog circuit 13. And the display unit is connected with the communication interface and is used for displaying the voltage and current data collected by the voltage and current collector 71 to a user, for example, displaying the collected data such as the analog load voltage, the analog load current and the power curve. And the data backup unit is connected with the communication interface and is used for storing the voltage and current data and the historical control data collected by the voltage and current collector.
The lower computer module 75 includes: and the PWM generating circuit is connected with the PID controller and is used for coding control signals from the upper computer module 73 and the manual control module 81, wherein the upper computer module 73 can transmit the control signals to the lower computer module 75 through a serial bus RS 485. And the PWM driver is connected with the PWM generating circuit and used for amplifying the coded control signal.
The embodiment of the invention utilizes the control module to control the load simulation circuit to generate a corresponding simulation load value according to the requirements of users, adopts a continuous adjustable structure and can realize dual-redundancy control, not only can be controlled by inputting digital signals through external terminals such as a PC (personal computer), but also can be controlled by conveniently and flexibly setting the required current and power through a manual control panel directly by the users.
Fig. 9 shows a schematic structural diagram of a load simulation apparatus according to a second embodiment of the present invention, where a structure similar to that of the load simulation apparatus according to the first embodiment is not repeated here, and only different structural features are described, as shown in fig. 9, the load simulation apparatus according to the second embodiment further includes: and the temperature adjusting module 91 is connected with the load simulation circuit 13 and is used for monitoring and adjusting the temperature of the load simulation circuit 13.
Wherein the temperature adjusting module 91 includes: the temperature sensor is used for acquiring the temperature data of the load simulation circuit 13 in real time; in actual working conditions, one or more temperature sensors can be arranged according to requirements to collect temperature data of each structure with high temperature hidden danger. And the controller is connected with the temperature sensor and used for performing analog-to-digital conversion on the temperature data acquired by the temperature sensor, comparing the temperature data digital signal obtained by conversion with a preset temperature threshold value, selectively outputting an instruction signal for controlling the fan to be turned on or turned off according to a comparison result, outputting an instruction signal for turning on the fan if the digital signal of the temperature data is greater than or equal to the preset turning-on temperature threshold value, and outputting an instruction signal for turning off the fan if the digital signal of the temperature data is less than the preset turning-off temperature threshold value. In actual working conditions, the controller can select corresponding equipment or structure according to requirements, such as a single chip microcomputer; the temperature threshold may be set as desired, for example, the on temperature threshold may be set to 20 degrees celsius and the off temperature threshold may be set to 17 degrees celsius. And the amplifying circuit is connected with the output end of the controller and is used for amplifying the command signal sent by the controller so as to avoid the situation that the output level of the controller is not enough to control the relay of the fan, so that the fan cannot normally run. And the fan is connected with the amplifying circuit through a relay and used for adjusting the temperature of the load simulation circuit according to the command signal of the controller.
The load simulation device provided by the embodiment of the invention is provided with the temperature adjusting module connected with the load simulation circuit, so that the temperature of the load simulation circuit is monitored and adjusted in real time, the fault of the load simulation circuit caused by overhigh temperature is effectively prevented, the reliability of the load simulation device is ensured to a certain extent, and the service life of the load simulation device is prolonged.
Based on the foregoing embodiment, the present invention further provides a method for testing performance of a dc power supply system, fig. 10 shows a flowchart of the method for testing performance of a dc power supply system in the embodiment of the present invention, and as shown in fig. 10, the method includes the following steps:
and step S1010, determining power supply test data according to the historical power utilization data of the preset time period.
Step S1020, controlling the load simulation apparatus as shown in the first embodiment and the second embodiment to simulate and generate a test load according to the power supply test data, and testing the dc power supply system to be tested according to the test load by using the load simulation apparatus.
Step S1030, recording power supply data and device states of the dc power supply system to be tested corresponding to each power supply test data, and determining a performance test result of the dc power supply system to be tested.
In step S1020, controlling the load simulation apparatus to simulate and generate a test load according to the power supply test data specifically includes: and inputting a demand load signal to a control module of the load simulation device according to the test demand, generating a control signal by the control module according to the demand load signal and the current load data of the load simulation device, and adjusting the test load value generated by the load simulation device through the control signal.
The embodiment of the invention adopts the steps to test the performance of the direct current power supply system, determines the test data based on the historical actual power consumption data, and then tests the performance of the direct current power supply system by using the load simulation device recorded in the first embodiment to the second embodiment of the invention, thereby improving the test efficiency of the direct current power supply system, effectively ensuring the accuracy of the performance test result, providing reliable data support for the design optimization of the direct current power supply system of the micro-grid, and being beneficial to the stable operation and development of the direct current power supply system of the micro-grid.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrase "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A load simulation apparatus, the apparatus comprising:
one end of the input module is connected with the output side of the direct current power supply system and used for receiving electric energy from the direct current power supply system;
the input end of the load simulation circuit is connected with the other end of the input module and used for simulating and generating a test load so as to consume the electric energy of the direct current power supply system;
the control module is connected with the load simulation circuit and is used for controlling the simulation load value generated by the load simulation circuit;
wherein the load simulation circuit includes:
an inductor (L), a first resistor (R1) connected with the inductor (L), a second resistor (R2) connected with the first resistor (R1), a power tube (T) connected with the second resistor (R2), and a first capacitor (C1) connected with the second resistor (R2) and the power tube (T) in parallel;
the buffer circuit is connected with the power tube (T) in parallel and used for buffering the energy of the power tube and protecting the power tube;
the buffer circuit includes: a second diode (D2), a second capacitor (C2) connected to the second diode (D2), and a third resistor (R3) connected in parallel with the second capacitor (C2).
2. The apparatus of claim 1, wherein the load simulation circuit further comprises:
the rectifying circuit is connected with the second resistor (R2) in parallel, forms a loop with the additional inductance of the second resistor (R2) and the second resistor (R2), and is used for absorbing the energy of the additional inductance of the second resistor (R2) and protecting the circuit;
the rectifier circuit includes: a first diode (D1).
3. The apparatus of claim 1, wherein the apparatus further comprises:
the temperature adjusting module is connected with the load simulation circuit and is used for monitoring and adjusting the temperature of the load simulation circuit;
the temperature adjustment module includes:
the temperature sensor is used for acquiring temperature data of the load simulation circuit in real time;
the controller is connected with the temperature sensor and used for carrying out analog-to-digital conversion on the temperature data acquired by the temperature sensor, comparing the digital signal of the temperature data obtained by conversion with a preset temperature threshold value and selectively outputting an instruction signal for controlling the fan to be turned on or turned off according to the comparison result;
the amplifying circuit is connected with the output end of the controller and is used for amplifying the instruction signal sent by the controller;
and the fan is connected with the amplifying circuit through a relay and used for adjusting the temperature of the load simulation circuit according to the command signal of the controller.
4. The apparatus of any of claims 1-3, wherein the input module comprises:
one end of the main control switch is connected with the output side of the direct current power supply system, and the other end of the main control switch is connected with the input end of the load simulation circuit and used for controlling the on-off of the electric energy transmission of the direct current power supply system;
the protection circuit is connected between the main control switch and the load analog circuit and is used for performing overcurrent protection and leakage protection on the load analog circuit;
the protection circuit includes a circuit breaker and a fuse connected to the circuit breaker.
5. The apparatus of claim 1, wherein the control module comprises:
the input end of the voltage and current collector is connected with the load analog circuit and is used for collecting voltage and current data of the load analog circuit in real time;
the upper computer module is connected with the voltage and current collector and is used for generating a control signal according to the voltage and current data collected by the voltage and current collector and the required voltage and current data from the external terminal equipment;
and the lower computer module is connected between the upper computer module and the load simulation circuit and is used for processing the control signal and transmitting the control signal to the load simulation circuit.
6. The apparatus of claim 5, wherein the control module further comprises: the manual control module is connected with the lower computer module and used for generating a control signal of a load simulation circuit in a simulation mode;
the manual control module includes:
the manual control panel is used for manually inputting required load simulation data;
and the potentiometer is connected with the manual control panel and is used for generating a control signal of the load simulation circuit according to the required load simulation data in a simulation mode.
7. The apparatus of claim 5, wherein the upper computer module comprises:
the communication interface is connected with the voltage and current collector and the external terminal equipment and used for receiving voltage and current data from the voltage and current collector and required voltage and current data of the external terminal equipment;
the PID controller is connected with the communication interface and is used for calculating according to the voltage and current data of the voltage and current collector and the required voltage and current data of the external terminal equipment to generate a control signal of the load analog circuit;
the display unit is connected with the communication interface and used for displaying the voltage and current data collected by the voltage and current collector to a user;
the data backup unit is connected with the communication interface and used for storing the voltage and current data and the historical control data collected by the voltage and current collector;
the lower computer module comprises:
the PWM generating circuit is connected with the PID controller and is used for coding control signals from the upper computer module and the manual control module;
and the PWM driver is connected with the PWM generating circuit and is used for amplifying the coded control signal.
8. A method of testing the performance of a dc power supply system, the method comprising:
determining power supply test data according to historical power utilization data of a preset time period;
controlling the load simulation device according to any one of claims 1 to 7 to simulate and generate a test load according to the power supply test data, and testing the direct current power supply system to be tested according to the test load by using the load simulation device; and recording the power supply data and the equipment state of the direct current power supply system to be tested corresponding to each power supply test data, and determining the performance test result of the direct current power supply system to be tested.
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| CN118209809A (en) * | 2024-05-21 | 2024-06-18 | 苏州华电电气股份有限公司 | Simulation debugging method and system for power unit of direct-current high-voltage generator |
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