A simulation device with feedback function

Abstract

The purpose of the present invention is to provide a simulation device with a feedback function, which is used in the field of power simulation devices, and includes: a simulation meter, a feedback load, and a control module; the simulation meter is used for user metering simulation of the simulation device; the feedback load is used to simulate the different load consumption of multiple users, and at the same time feed back the simulated load consumption to the mains; the control module is used to control multiple feedback loads to generate different loads, thereby simulating the different loads of multiple users, and making the corresponding simulation meter record consumption parameters to achieve a real user power simulation. The system reduces the overall heat generation and loss of the simulation device, reduces the weight and volume of the simulation device, reduces the overall heat dissipation pressure, and makes the simulation device more in line with the on-site environment. It effectively solves the problems of high heat generation, high noise, and non-compliance with the site in the existing simulation device.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation devices in power systems, and in particular to a simulation device with a feedback function. Background Art

[0002] In the simulation device for power training, in order to simulate the power consumption on site, it is necessary to simulate the normal current passing through the device meter and there is a certain power in the line behind the meter.

[0003] However, in current power simulation training devices, the power behind the meter is simulated using the current of the real load resistor, which results in high heat generation, high noise, and the need for additional heat dissipation devices, as well as huge power loss. In order to avoid the problems of high loss and high heat generation, the power and current of power simulation devices are generally not very large, and the current fluctuations cannot be made as on-site, making it difficult to truly simulate the actual power consumption on site, which has repeatedly reduced the simulation training function of the simulation device.

[0004] There is another common virtual load function used in simulation devices. For example, the patent "A virtual load current source CN201904736U" has a method of converting low current into virtual load current through an amplifying coil to form a virtual load power for use in simulation devices. However, the virtual load current of this scheme is isolated from other lines in the substation, similar to the state after passing through an isolation transformer. It cannot be used for the detection of injection signal functions such as "line topology" and "substation detection" in the simulation device, making the simulation device inconsistent with the on-site conditions. This virtual load is also not suitable for use in the simulation device.

[0005] Therefore, a more suitable simulation device is needed, which has the advantages of both virtual load and real load while eliminating their defects, and meets the requirements of low heat generation, low loss and stepless regulation, while not causing signal isolation like real load. Summary of the invention

[0006] The purpose of the present invention is to provide a simulation device with a feedback function, which generates less heat and has less power loss than other simulation devices, and is closer to the actual power consumption. The simulation device mentioned in this patent is a simulation device with a feedback function.

[0007] To achieve the above object, the present invention provides the following technical solutions: A simulation device with feedback function, comprising: a simulation meter, a feedback load, and a control module; The simulation meter is used for metering simulation of users in the simulation device, the incoming line is connected to the power supply line of the simulation device, and the outgoing line is connected to the feedback load; The front end of the feedback load is connected to the outgoing line side of the simulation meter, and the rear ends of multiple feedback loads are connected in series to the power supply line of the simulation device, so as to simulate different load consumptions of multiple corresponding users and feed back the simulated load consumption to the city power. The control module is connected to a plurality of feedback loads and is used to control the plurality of feedback loads to generate different loads, thereby simulating different loads of corresponding users, and making the corresponding simulation meters record consumption parameters, thereby achieving real user power consumption simulation.

[0008] The regenerative load includes: power module, load module, power tracking module, and regenerative module; The front end of the power module is connected to the output line of the simulation meter to convert the 220V AC power of the city power into DC power and supply power to other modules. The load module is installed at the rear end of the power module and connected to the power tracking module to adjust the DC voltage and virtual load current output by itself, thereby changing its own power. The power provides a simulated load for the simulated electric meter, and the simulated load is virtual power that will not be actually consumed. The power tracking module is connected to the feedback module to track and stabilize the output power of the load module. When the output power deviates, the output DC power supply or virtual load current can be adjusted at any time to track the power. The feedback module is connected to the front end of the power line to convert the DC power output by the load module into AC power of the mains frequency, and then invert it into the power grid to form a feedback closed loop.

[0009] Furthermore, the control module is connected to the inside of the feedback load, and the control module is connected to the rear end of multiple power tracking modules, and the rear end is connected to the feedback module.

[0010] Furthermore, the power supply module is a DC power supply, which converts the mains power into DC power through the principle of a rectifier.

[0011] Furthermore, the feedback module is an inverter without MPPT, which is used for feedback of DC power and does not interfere with the stability of the power tracking module.

[0012] Furthermore, the load module also has a 485 communication interface to set the corresponding power frame and control the size of the virtual power generated.

[0013] Furthermore, the virtual power will not be consumed by the load and will be fed back into the grid, which will reduce the overall power consumption and heat generation.

[0014] Furthermore, the power tracking module will stabilize the output power. When the virtual power deviates from the set power, it will change the line power by adjusting its own disturbance resistance to stabilize the virtual power within the deviation range of the set power.

[0015] Furthermore, the inverter in the feedback module cancels the MPPT function to avoid mutual disturbance between the MPPT and power tracking modules when used simultaneously, thereby avoiding continuous power fluctuations in the entire feedback system. The MPPT is the maximum power point tracking function, which automatically tracks the maximum power point by disturbing its own resistance, current and other parameters.

[0016] In the regenerative system, the power of the load module is set so that the current after the meter can be infinitely adjusted. Because the power is not actually consumed, less heat is generated, and large current simulation can be achieved in the simulation device. Compared with the existing common real load current of 0~3A, or the amplified current of 0~5A of virtual load, the regenerative load only needs to meet the power supply and inverter power. If the wire diameter is sufficient, the current after the meter can reach more than 10A in the simulation device.

[0017] At the same time, the feedback load can add a frequency conversion to make the virtual load current in a fluctuating state, simulating the fluctuation phenomenon of the on-site electric meter, which greatly increases the authenticity of the simulation device.

[0018] In actual use, most of the power is fed back into the grid through the inverter, so the power in the whole system only has DC power loss, line module power supply loss, and inverter feedback loss, and the overall feedback rate is about 70%. Compared with the original real load that completely loses the simulated after-meter power, there is a significant improvement.

[0019] Compared with the prior art, the beneficial effects of the present invention are: reduced heat generation, reduced losses, reduced weight and volume of the simulation device, reduced overall heat dissipation pressure, and increased over-meter current in the simulation device, which is more realistic and more in line with the on-site environment. At the same time, a photovoltaic meter can be installed on the feedback part to complete the task of metering feedback, and also allow the entire device to have the function of simulating a photovoltaic system. It effectively solves the problems of high heat generation, high noise, and non-compliance with the site in the existing simulation device. Replacing the existing load with a feedback load perfectly solves the problem, making the simulation training device for power lines have a better prospect.

[0020] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an application diagram of a simulation device with feedback function on the load side in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a simulation device with feedback function includes: a simulation meter, a feedback load, and a control module; The simulation meter is used for metering simulation of users in the simulation device, with the incoming line connected to the power supply line of the simulation device and the outgoing line connected to the feedback load; The front end of the feedback load is connected to the outgoing line side of the simulation meter, and the rear ends of multiple feedback loads are connected in series to the power supply line of the simulation device, so as to simulate the different load consumption of multiple corresponding users and feed back the simulated load consumption to the city power. The control module is connected to a plurality of feedback loads and is used to control the plurality of feedback loads to generate different loads, thereby simulating different loads of corresponding users and making the corresponding simulation meters record consumption parameters, thereby achieving real user power consumption simulation.

[0024] The feedback load includes: a power module, a load module, a power tracking module, and a feedback module.

[0025] The front end of the power module is connected to the mains power line to convert the industrial frequency 220V AC power into DC power, and the back end is connected to the load module.

[0026] The load module is powered by the power module and generates virtual power by changing the DC current and voltage at its own output terminal. The virtual power is equivalent to the AC conversion power of the power module and is calculated in combination with the AC voltage to obtain the load current required by the simulation meter.

[0027] The power tracking module is powered by the power module, stabilizes the corresponding power through its own disturbance resistance, and the output line is connected to the control module.

[0028] The front end of the control module can be connected to multiple power tracking modules, and the back end is connected to the feedback module.

[0029] The feedback module includes a DC input interface and an AC output interface. The DC input interface is connected to the output of the power tracking module and is powered by the DC power. The AC output interface is connected to the front end of the 220V mains line to convert the virtual power DC into high-voltage AC power and integrate it into the mains power grid.

[0030] Furthermore, multiple power tracking modules can be connected to the control module together, and the back end is connected to the DC input interface of the feedback module. Take a simulation device with 10 simulation meters as an example. At this time, the corresponding control module has more than 10 power interfaces, and ten sets of feedback loads are connected to the power interface together. The power interfaces in the control module are in a series state. For example: the negative pole of power interface 1 is connected to the positive pole of power interface 2, the negative pole of power interface 2 is connected to the positive pole of power interface 3, and so on. The negative pole of power interface 9 is connected to the positive pole of power interface 10. At this time, the total output line of the control module is the positive pole of power interface 1 and the negative pole of power interface 10. The 10 feedback loads are connected in series. The current of the feedback loads is the same, but the voltage is different. The DC voltage of the entire series circuit is the sum of the voltages of the 10 sets of feedback loads. The control module can control the total current of the output end through the built-in sensor, and adjust the output voltage under the premise that the total power remains unchanged.

[0031] Further Figure 1 For example, when the current required by the simulation table 1 is 5A, the load module 1 calculates that the power required when the table 1 is at 5A is 1.1kW. The load module 1 adjusts the voltage and current at its own DC output end to make its power 1.1kW, so that the power of the power module 1 converted from AC to DC is also 1.1kW; the output line of the load module is connected to the power tracking module, and the power is kept stable by the disturbance resistor, and the output lines of all power tracking modules are connected to the control module; the control module obtains the access power combination of all power tracking modules, and controls the voltage and current at the output end so that the output voltage is greater than the voltage required for the feedback module to start, and the current meets the access power combination; assuming that the feedback module 1 requires a DC voltage of 110V to start, at this time, the output end of the control module adjusts its own voltage and current to output 110V, 10A DC power, which is connected to the feedback module 1; the feedback module 1 inverts the input DC power into AC power through the inverter principle and feeds it back to the front end of the table 1, and then feeds it back into the city power. At this time, the overall equivalent of "power module-load module-power tracking module-control module-feedback module" is 1.1kW of post-meter load. The simulated load in Table 1 is 5A after the AC voltage calculation. In fact, due to the loss of the module itself, the actual post-meter load will be slightly higher than the set load. Therefore, the simulation device will calculate the power consumption of its own module in the overall load through operations such as zero calibration when leaving the factory. By changing the DC voltage and current of the load module and the power tracking module to change the overall power, the simulation device can achieve the simulation characteristics of the required load. While the whole process completes the stepless adjustment of the post-meter load power, most of the electric energy will not be lost, but returned to the AC power by the feedback module.

[0032] Furthermore, when multiple simulation tables are simulating current, assuming that simulation table 1, simulation table 2, and simulation table 3 all require 5A current, load module 1, load module 2, and load module 3 calculate the required power of 1.1kW, adjust their own back-end voltage and current, and connect them to the control module input terminal together when the power module is powered and the power tracking module is stable; the control module has multiple input ports, and the total power connected at this time is 3.3kW. Assuming that the feedback module 1 is rated at 110V DC voltage, the output terminal of the control module adjusts its own voltage and current to output 110V, 30A. Direct current is connected to feedback module 1; feedback module 1 inverts the input direct current into alternating current through the inverter principle and feeds it back to the front end of table 1; at this time, the overall equivalent of "power module-load module-power tracking module-control module-feedback module" is 3.3kW of post-meter load, and the total simulated load of tables 1, 2, and 3 obtained by calculating the city power voltage is 15A. At this time, the front-end power is maintained at the required power setting value through the adjustment of the back-end power tracking module 1, power tracking module 2, and power tracking module 3. Therefore, when the total simulated current is 15A at this time, the simulated currents of tables 1, 2, and 3 are all 5A.

[0033] When multiple power access control modules are connected, the power tracking module is responsible for stabilizing the virtual power, and the control module is responsible for integrating multiple access powers. When different access powers change and the total power changes, the control module adjusts the output voltage and current to change the total output power. Through the adjustment of the control module, the multiple simulation table loads of the entire simulation device only need one high-power feedback module to complete all power recovery; at the same time, the DC voltage required for the feedback module (without MPPT inverter) to start is relatively high, usually more than 150V, and conventional DC power supplies cannot reach this voltage, so when multiple sum devices are connected in series, it also provides a starting voltage for the feedback module.

[0034] Furthermore, the virtual power is the self-power adjusted by the load module. This power is supplied by the power module from AC to DC, and is formed by adjusting the DC voltage and current output by itself. It is not substantially consumed or used, and is then converted into AC by the feedback module and then incorporated into the mains. During the entire "AC-DC-AC" conversion process, this virtual power does almost no work, thus greatly reducing the heat generation and loss of the device, reducing the noise of the power simulation device, and thus reducing the heat dissipation requirements of the entire simulation device. Because the virtual power is the power whose voltage can be adjusted and tracked at any time, the fluctuation amplitude of the power adjustment can be set, so that the load is closer to the constantly fluctuating power phenomenon in the real scene, solving the problem that the real load power is completely constant and unreal.

[0035] Furthermore, the control module records the rated parameters of the feedback module, and calculates whether the output voltage and current values ​​are over-voltage or under-current when in use. When the voltage or current exceeds or falls below the set critical value, the overall voltage or current is adjusted by changing so that the voltage and current are within the rated working safety range, thereby preventing the incoming line voltage of the feedback module from exceeding or falling below its applicable range, resulting in over-voltage or under-current protection, thereby affecting the use of the entire simulation device.

[0036] Furthermore, the feedback module must use an inverter without MPPT. If a conventional MPPT inverter is used, the feedback module and the power tracking module will track and interfere with each other, which will cause power fluctuations in the entire series line, resulting in large fluctuations in the DC voltage, affecting overall use. The principle is that the MPPT of the inverter and the power tracking module both achieve power tracking by changing their own disturbance resistance and duty cycle, while the real power in the system is low. Most of the power is virtual power formed by the load module by adjusting its own voltage and current. This virtual power is easily affected by changes in the circuit, so the power tracking module is required to be responsible for regulation and stability. When the MPPT inverter and the power tracking module are used at the same time, the power tracking module will change its disturbance resistance when adjusting the virtual load, causing the resistance of the entire line to change. At this time, the MPPT will perform disturbance observation after sensing the change, and also change its disturbance resistance. After the MPPT disturbance observation, the resistance of the entire line changes again. At this time, the power tracking module needs to readjust its own disturbance resistance. At this time, the MPPT will adjust again after sensing the line change. At this time, the entire line falls into a repetitive infinite loop of "power tracking module adjustment-MPPT disturbance adjustment-power tracking module further adjustment-MPPT further disturbance adjustment", causing the power of the entire series line to fluctuate sharply, affecting the operation of all devices.

[0037] Furthermore, in a simulation device with feedback function, most of the load power is fed back into the power grid through the inverter. Therefore, the power in the whole system only has line loss, DC power loss, module power loss, and inverter feedback loss. The power loss of the DC power supply is about 10%, and the conversion efficiency of the inverter is about 85%. This makes the overall feedback rate of the simulation device with feedback function about 70%. Compared with the original simulation device in which the meter load is completely lost, there is a significant improvement.

[0038] As mentioned above, the heat generated by the loss of the feedback load system is reduced by about 70% compared with the load resistance. This also reduces the simulation device's demand for cooling and noise reduction functions, reduces the space and weight required for the corresponding cooling installation, and the overall device requires less space.

[0039] In summary, compared with the prior art, the beneficial effects of the present invention are: reduced heat generation, reduced losses, reduced weight and volume of the simulation device, reduced overall heat dissipation pressure, and increased over-meter current in the simulation device, which is more realistic and more in line with the on-site environment. At the same time, a photovoltaic meter can be added to the feedback part, which not only completes the task of metering feedback, but also allows the entire device to have the function of simulating a photovoltaic system. It effectively solves the problems of high heat generation, high noise, and non-compliance with the site in the existing simulation device. Replacing the existing load with a feedback load perfectly solves the problem, making the simulation training device for power lines have a better prospect.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A simulation device with feedback function, characterized in that include: Simulation meter, feedback load, control module; The simulation meter is used for metering simulation of users in the simulation device, with an incoming line connected to a power supply line of the simulation device and an outgoing line connected to the feedback load; The front end of the feedback load is connected to the outgoing line side of the simulation meter, and the rear ends of the multiple feedback loads are connected in series to the power supply line of the simulation device, so as to simulate the different load consumption of multiple corresponding users and feed back the simulated load consumption to the city power; The control module is connected to a plurality of feedback loads and is used to control the plurality of feedback loads to generate different loads, thereby simulating different loads of corresponding users, and making the corresponding simulation meters record consumption parameters, thereby achieving real user power consumption simulation.

2. A simulation device with feedback function according to claim 1, characterized in that The feedback load includes: a power module, a load module, a power tracking module, and a feedback module; The front end of the power module is connected to the outlet line of the simulation meter to convert the AC power of the mains into DC power and supply power to other modules; The load module is installed at the rear end of the power module and connected to the power tracking module, and is used to adjust the DC voltage and virtual load current output by itself, so as to change its own power. The power provides a simulated load for the simulated electric meter, and the simulated load is a virtual power that will not be actually consumed. The power tracking module is connected to the feedback module, and is used to track and stabilize the output power of the load module. When the output power deviates, the output DC power supply or virtual load current can be adjusted at any time to track the power. The feedback module is connected to the front end of the power line, and is used to convert the DC power output by the load module into AC power of the mains frequency, and reversely invert it into the power grid to form a feedback closed loop.

3. A simulation device with feedback function according to claim 2, characterized in that The control module is connected to the inside of the feedback load, and the control module is connected to the rear end of multiple power tracking modules, and the rear end is connected to the feedback module.

4. The simulation device with feedback function according to claim 2 is characterized in that: The power supply module is a DC power supply, which converts the mains power into DC power through the principle of a rectifier.

5. The simulation device with feedback function according to claim 2, characterized in that: The feedback module is an inverter without MPPT, which is used for feedback of DC power and will not interfere with the stability of the power tracking module.

6. The simulation device with feedback function according to claim 2, characterized in that: The load module also has a 485 communication interface to set the corresponding power frame and control the size of the virtual power generated.

7. The simulation device with feedback function according to claim 2, characterized in that: The virtual power will not be consumed by the load, but fed back into the power grid, so that the overall power consumption is reduced and the heat generation is reduced.

8. The simulation device with feedback function according to claim 7, characterized in that: The power tracking module can stabilize the output power. When the virtual power deviates from the set power, the line power is changed by adjusting its own disturbance resistance so that the virtual power is stabilized within the deviation range of the set power.

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