Method and system for calculating loss of energy consumption valve of direct-current energy consumption device

Abstract

The invention relates to a loss calculation method and system for an energy consumption valve of a direct-current energy consumption device, and belongs to the technical field of direct-current energy consumption devices. According to the method, the working state of an energy consumption valve of the direct-current energy consumption device is divided into a hot standby state and an energy consumption state; the energy consumption state comprises a switching-in and switching-out stage, a switching-in stage and a switching-out stage, and the average loss rate of the energy consumption valve of the direct-current energy consumption device is finally obtained through calculation of loss or loss rates in different states; the method is used for solving the problem that thermal stress design of core components of the energy-consuming valve and valve hall heating and ventilation design are affected due to lack of evaluation on the loss rate of the energy-consuming valve.

Description

Technical Field

[0001] The invention relates to a method and a system for calculating the loss of an energy-consuming valve of a direct current energy-consuming device, and belongs to the technical field of direct current energy-consuming devices. Background Art

[0002] With the deepening of my country's dual carbon goals, large-scale flexible DC transmission of new energy bases such as offshore wind power and photovoltaic wind power in the desert area has become a future trend. The DC energy consumption device is connected in parallel with the DC line. It is mainly used to put the DC energy consumption device into use when the energy transmission at the receiving end is blocked to achieve surplus energy discharge, avoid causing the receiving end converter valve to over-voltage and cause the system to trip, thereby affecting the safe and stable operation of the transmission system.

[0003] The typical topology of DC energy dissipation device is divided into three categories: centralized, distributed and hybrid according to whether the energy dissipation resistor is centralized and whether the energy dissipation valve has an energy dissipation resistor. The core is: in the energy dissipation state, the energy dissipation resistor in the DC energy dissipation device is connected to the DC bus, and the surplus power is discharged by heating the energy dissipation resistor.

[0004] The current DC energy consuming devices mainly adopt centralized DC energy consuming devices, which are usually in hot standby state. The HVAC design margin of the valve hall is large, and the loss of energy consuming valves is usually small, so their loss characteristics have not received much attention.

[0005] However, with the development of distributed and hybrid DC energy consumption devices, the loss rate of the energy consumption valve affects the thermal stress design of the core components of the energy consumption valve. And with the demand for refined design and management of DC engineering, the loss assessment of the energy consumption valve becomes increasingly important. Summary of the invention

[0006] The purpose of the present invention is to provide a method and system for calculating the loss of energy-consuming valves of a DC energy-consuming device, so as to solve the problems of thermal stress design of the core components of the energy-consuming valves and valve hall HVAC design, which are affected by the lack of evaluation of the loss rate of the energy-consuming valves.

[0007] To achieve the above object, the solution of the present invention includes:

[0008] A method for calculating the loss of an energy-consuming valve of a direct current energy-consuming device of the present invention comprises the following steps: dividing the working state of the energy-consuming valve of the direct current energy-consuming device into a hot standby state and an energy-consuming state; calculating and obtaining the loss rate of the hot standby state; further dividing the energy-consuming state into at least a switching-on and switching-off stage in which the number of submodules of the energy-consuming device is from a maximum to a minimum and from a minimum to a maximum, and a switching-on stage in which the number of submodules of the energy-consuming device is the smallest; calculating the switching-on and switching-off loss rate of energy consumption in the switching-on and switching-off stages under the duration of the energy-consuming state; calculating the switching-on loss rate of energy consumption in the switching-on stage under the duration of the energy-consuming state according to the switching-on current, the conduction voltage drop, the number of energy-consuming valve submodules and the duration of the switching-on stage collected from the energy-consuming state of a complete direct current energy-consuming device, and obtaining the energy-consuming state loss rate of the energy-consuming valve of the direct current energy-consuming device under the energy-consuming state according to the switching-on and switching-off loss rate and the switching-on loss rate; and calculating the average loss rate of the energy-consuming valve of the direct current energy-consuming device according to the hot standby state loss rate, the duration of the hot standby state, the energy-consuming state loss rate and the duration of the energy-consuming state.

[0009] Furthermore, the average loss rate P2 of the energy-consuming valve of the DC energy-consuming device is calculated by the following formula:

[0010] P2=((P1×ΔT ready )+(P3×ΔT use )) / (ΔT ready +ΔT use )

[0011] Among them, P1 is the loss rate of hot standby state, P3 is the loss rate of energy consumption state, ΔT ready is the hot standby time, ΔT use It is the duration of energy consumption state.

[0012] Furthermore, the loss rate in the hot standby state includes the loss rate of capacitors, balancing resistors and boards; the loss rate of capacitors, balancing resistors and boards is calculated based on relevant standards of GB / T35702 and IEC62751.

[0013] Furthermore, according to the corresponding project, the time interval between two adjacent maximum energy absorption of the DC energy consumption device is obtained as the duration of a single hot standby state, and the continuous maximum input time of the DC energy consumption device is obtained as the duration of a single energy consumption state.

[0014] Furthermore, the single switching loss is obtained according to the device parameters of the DC energy consumption device; the number of energy consumption valve submodules, the duration of the switching-in phase and the number of switching-in and switching-out times of entering and exiting the energy consumption phase under the energy consumption state are obtained according to the corresponding project.

[0015] Furthermore, the energy consumption state loss rate is the sum of the investment and withdrawal loss rate, the investment loss rate and other loss rates; other loss rates are obtained according to the relevant standards of GB / T35702 and IEC62751.

[0016] Furthermore, the investment and withdrawal loss rate is the single investment and withdrawal loss multiplied by the number of investment and withdrawal times multiplied by the number of energy-consuming valve sub-modules divided by the duration of the energy-consuming state; the input loss rate is the input current multiplied by the conduction voltage drop multiplied by the number of energy-consuming valve sub-modules multiplied by the duration of the input stage divided by the duration of the energy-consuming state.

[0017] Furthermore, the energy consumption state is divided into an exit stage with the largest number of sub-modules put into operation in the energy consumption device. The exit loss rate of the exit stage loss under the energy consumption state duration is also calculated. The energy consumption state loss rate of the energy consumption valve of the DC energy consumption device under the energy consumption state is obtained based on the exit loss rate, the exit loss rate and the input loss rate.

[0018] Furthermore, the exit loss rate can be obtained through experiments, offline calibration or instructions provided by the device manufacturer.

[0019] A method for calculating the loss of an energy-consuming valve of a direct current energy-consuming device of the present invention comprises the following steps: dividing the working state of the energy-consuming valve of the direct current energy-consuming device into a hot standby state and an energy-consuming state; calculating and obtaining the hot standby state loss of a single hot standby state; further dividing the energy-consuming state into at least a switching-on and switching-off stage in which the number of submodules of the energy-consuming device switches from a maximum to a minimum and from a minimum to a maximum, and a switching-on stage in which the number of submodules of the energy-consuming device switches is the smallest; calculating the switching-on and switching-off losses of the switching-on and switching-off stages; calculating the switching-on losses of the switching-on stage according to the switching-on current, the conduction voltage drop, the number of energy-consuming valve submodules and the duration of the switching-on stage collected from the energy-consuming state of a complete direct current energy-consuming device; obtaining the energy-consuming state loss of the energy-consuming valve of the direct current energy-consuming device in the energy-consuming state according to the switching-on and switching-off losses and the switching-on losses; and calculating the average loss rate of the energy-consuming valve of the direct current energy-consuming device according to the hot standby state loss, the duration of the hot standby state, the energy-consuming state loss and the duration of the energy-consuming state.

[0020] Furthermore, the average loss rate P2 of the energy-consuming valve of the DC energy-consuming device is calculated by the following formula:

[0021] P2=(E1+E5) / (ΔT ready +ΔT use )

[0022] Among them, E1 is the loss in hot standby state, E5 is the loss in energy consumption state, ΔT ready is the hot standby time, ΔT use It is the duration of energy consumption state.

[0023] Furthermore, the hot standby state loss includes the loss of capacitors, equalizing resistors and boards; the hot standby state loss is the hot standby loss rate multiplied by the hot standby time; the loss rate of capacitors, equalizing resistors and boards is calculated based on the relevant standards of GB / T35702 and IEC62751.

[0024] Furthermore, according to the corresponding project, the time interval between two adjacent maximum energy absorption of the DC energy consumption device is obtained as the duration of a single hot standby state, and the continuous maximum input time of the DC energy consumption device is obtained as the duration of a single energy consumption state.

[0025] Furthermore, the single switching loss is obtained according to the device parameters of the DC energy consuming device; the number of energy consuming valve submodules, the duration of the switching-in phase and the number of switching-in and switching-out times are obtained according to the corresponding project.

[0026] Furthermore, the energy consumption state loss is the sum of the investment and withdrawal loss, the input loss and other losses; other losses are other loss rates multiplied by the number of energy-consuming valve sub-modules and then multiplied by the duration of the energy consumption state; other loss rates are obtained according to the relevant standards of GB / T35702 and IEC62751.

[0027] Furthermore, the throw-in loss is the single throw-in loss multiplied by the throw-in times multiplied by the number of energy-consuming valve modules; the input loss is the current multiplied by the conduction voltage drop multiplied by the number of energy-consuming valve modules multiplied by the duration of the input stage.

[0028] Furthermore, the energy consumption state is divided into an exit stage with the largest number of sub-modules put into operation in the energy consumption device. The exit loss of the exit stage under the energy consumption state duration is also calculated. The energy consumption state loss of the energy consumption valve of the DC energy consumption device under the energy consumption state is obtained based on the exit loss, exit loss and input loss.

[0029] Furthermore, the exit loss is a single exit loss rate multiplied by the number of exits and then multiplied by the number of energy-consuming valve modules; the exit loss rate can be obtained through experiments, offline calibration or the instructions provided by the device manufacturer.

[0030] A system for calculating energy consumption valve loss of a DC energy consumption device of the present invention comprises a processor, and the processor is used to execute a computer program to implement the steps of the above method for calculating energy consumption valve loss of a DC energy consumption device.

[0031] The beneficial effects of the present invention are as follows: the present invention provides a method and system for calculating the loss of a DC energy-consuming device energy-consuming valve. The working state of the DC energy-consuming device energy-consuming valve is divided into a hot standby state and an energy-consuming state. By obtaining the hot standby state duration, hot standby state loss, energy-consuming state duration and energy-consuming state loss, the hot standby state loss rate of the DC energy-consuming device energy-consuming valve, the energy-consuming state loss rate of the DC energy-consuming device energy-consuming valve and the average loss rate of the DC energy-consuming device energy-consuming valve are calculated. The problem of thermal stress design of the core components of the energy-consuming valve and valve hall HVAC design, which are affected by the lack of evaluation of the energy-consuming valve loss rate, is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a typical topological diagram of a DC energy-consuming device;

[0033] Figure 2It is the operating status diagram of the DC energy consumption device;

[0034] Figure 3 It is the energy consumption state process diagram of the DC energy consumption device;

[0035] Figure 4 It is a flow chart of a method for calculating the loss of energy-consuming valves in DC energy-consuming devices;

[0036] Figure 5 It is a flow chart of another method for calculating the loss of energy-consuming valves in DC energy-consuming devices. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail in a clear and complete manner in conjunction with the accompanying drawings and embodiments.

[0038] The idea of ​​the present invention is to divide the working state of the energy-consuming valve of the DC energy-consuming device into a hot standby state and an energy-consuming state; the energy-consuming state includes a put-in-and-withdrawal stage, an input stage and an output stage, and finally obtain the average loss rate of the energy-consuming valve of the DC energy-consuming device by calculating the loss or loss rate under different states.

[0039] Typical topology diagram of DC energy consumption device is as follows: Figure 1 As shown, the energy dissipation valve of the DC energy dissipation device may not include an energy dissipation resistor, such as a centralized energy dissipation device; the energy dissipation valve may also include an energy dissipation resistor, such as a distributed energy dissipation device and a hybrid energy dissipation device, and the energy dissipation resistor loss must be taken into account; if the distributed DC energy dissipation device has no centralized energy dissipation resistor, the concept of the energy dissipation valve under this topology is equivalent to that of the DC energy dissipation device.

[0040] Specifically, Figure 1 Taking the centralized energy consumption device shown as an example, in the energy consumption state, when the energy consumption device is put into operation signal is received, the switch device in the energy consumption valve is turned on, and all the sub-modules are bypassed. At this time, the number of sub-modules put into operation by the energy consumption device is 0, and the energy consumption resistor in the DC energy consumption device is connected to the DC bus, and the surplus power is discharged by heating the energy consumption resistor.

[0041] The operating status diagram of the DC energy consumption device is as follows: Figure 2 As shown, the DC energy consumption device is put into operation when the DC voltage fluctuates to stabilize the DC voltage. ΔT use The duration of the energy consumption state is ΔT, and the interval between two energy consumption states is the duration of the hot standby state. ready; a, b are the set DC voltage thresholds. In a primary energy consumption state, when the DC voltage rises to the highest threshold a, the DC energy consumption device is triggered to enter the input stage of the energy consumption state for energy consumption; after a period of power discharge in the input stage, when the DC voltage is pulled down to the threshold b, the DC energy consumption device enters the exit stage of the energy consumption state; in the energy consumption state, by adjusting the number of sub-modules of the energy consumption device, the DC energy consumption device is controlled to switch between the input stage and the exit stage (when the number of sub-modules of the energy consumption device is 0, it enters the input stage for energy consumption, and when the number of sub-modules of the energy consumption device is the maximum, it enters the exit stage; the process of the number of sub-modules of the energy consumption device changing between 0 and the maximum is the input and exit stage between the input stage and the exit stage). In a primary energy consumption state, as the DC voltage fluctuates, the number of sub-modules of the energy consumption device is continuously adjusted until a stable DC voltage is output.

[0042] The energy consumption state process of the DC energy consumption device is as follows Figure 3 As shown in the figure, when the energy consumption device input signal is 1, the switch devices in the energy consumption valve are turned on successively, bypassing all the sub-modules in turn, and entering the input stage. At this time, the number of sub-modules put into the energy consumption device is 0. In this process, ΔT 1_1 ~ΔT 3_1 is a single complete energy consumption cycle, ΔT 1_1 +ΔT 1_2 is the single investment and withdrawal duration, ΔT 2_1 is the single input duration, ΔT 3_1 The duration of a single exit. The duration of the energy consumption state ΔT use =(ΔT 1_1 +ΔT 1_2 +ΔT 2_1 +ΔT 3_1 )×number of withdrawals.

[0043] Method Example 1:

[0044] like Figure 4 The figure shows a method for calculating the energy consumption valve loss of a DC energy consumption device in this embodiment. The overall process is: the working state of the DC energy consumption device is divided into a hot standby state and an energy consumption state. The energy consumption state includes a start-up phase, an input phase, and an exit phase. The hot standby state duration ΔT is obtained by theoretical analysis or simulation analysis of the energy consumption valve operation process. ready , Energy consumption state duration ΔT use , the time length of loss of investment and withdrawal ΔT1, the time length of investment loss ΔT2, the time length of withdrawal loss ΔT3, according to GB / T35702, IEC62751 and other relevant standards, considering other losses such as capacitors and control boards, the loss rate of hot standby state of energy-consuming valve P1 and the loss rate of energy-consuming state of energy-consuming valve P3 are obtained; finally, the formula P2=((P1×ΔT ready )+(P3×ΔT use)) / (ΔT ready +ΔT use ) to obtain the average loss rate of the energy-consuming valve of the DC energy-consuming device.

[0045] The following is a brief calculation description based on a certain project:

[0046] In a certain project, it is required that the maximum continuous input time of the DC energy consumption device is 1.5s, and the time interval between two maximum energy absorption is 20min, that is, ΔT ready =20min, ΔT use =1.5s, at 100% energy consumption, the average duty cycle of the energy consumption device input signal is 88%; the average input and output cycle is 50ms, that is, ΔT 1_1 +ΔT 2_1 +ΔT 1_2 +ΔT 3_1 =50ms; during the whole process, the DC energy consumption device was collected and switched on and off 30 times, and the duration of each switch was 3ms, that is, ΔT 1_1 +ΔT 1_2 =3ms, a total of about 90ms; single input time ΔT 2_1 44ms, a total of about 1320ms; single exit duration ΔT 3_1 The time between switching on and off is 3ms, and the total time is about 90ms. The current is 1615A and the on-state voltage drop is 3.4V. The instructions provided by the device manufacturer show that the switching on energy is 8J and the switching off energy is 8.5J, that is, the switching on and off loss of a single module is 16.5J, the loss rate of the voltage-sharing resistor is about 50W, and the loss rate of the control board is about 20W. The withdrawal period (ΔT 3_1 )Switching loss, switching period (ΔT 1_1 +ΔT 1_2 ) conduction loss, the power device loss rate during the DC energy-consuming valve (energy-consuming valve has a total of 432 submodules) can be calculated. The loss rate of the voltage-equalizing resistor and the control board is (50+20)×432 / 1000=30.24kw, that is, the loss rate of the energy-consuming valve in the hot standby state is P1=30.24kW and the other loss rates P in the energy-consuming state are 其他 =30.24kw. Therefore, the energy consumption process loss rate P4 = P 投退 +P 投入 =142.56+2087.46=2230.02kw, the energy consumption valve loss rate in the energy consumption state is P3=P 投退 +P 投入 +P 其他 =142.56+2087.46+30.24=2260.26kW. Without considering the switch loss during the hot standby period of the energy-consuming valve, the average loss rate of the energy-consuming valve from this time to the next time it is put into use is

[0047] In the above engineering example, the loss during the exit phase is not considered in the calculation. As another implementation method, the exit period (ΔT 3_1 ) loss rate to improve the accuracy of loss rate calculation. The exit loss rate can be obtained from experiments, offline calibration or the instructions provided by the device manufacturer, then the energy consumption process loss rate P4 = P 投退 +P 投入 +P 退出 , the energy consumption rate of the energy consumption valve is P3=P 投退 +P 投入 +P 退出 +P 其他 The remaining calculations have been clearly described in method embodiment 1 and will not be repeated here.

[0048] Method Example 2:

[0049] like Figure 5 The figure shows a method for calculating the energy consumption valve loss of a DC energy consumption device in this embodiment. The overall process is: the working state of the DC energy consumption device is divided into a hot standby state and an energy consumption state. The energy consumption state includes a start-up phase, an input phase, and an exit phase. The hot standby state duration ΔT is obtained by theoretical analysis or simulation analysis of the energy consumption valve operation process. ready , Energy consumption state duration ΔT use ;According to the device parameters of the DC energy consumption device, the single-time input and output loss and the single-time withdrawal loss are obtained;According to relevant standards such as GB / T 35702 and IEC62751, the hot standby state loss E1 and the energy consumption state loss E5 of the energy consumption valve are calculated;Finally, the average loss rate of the energy consumption valve of the DC energy consumption device is obtained by the formula P2=(E1+E5) / (ΔT ready +ΔT use ).

[0050] The following is a brief calculation description based on a certain project:

[0051] In a certain project, it is required that the maximum continuous input time of the DC energy consumption device is 1.5s, and the time interval between two maximum energy absorption is 20min, that is, ΔT ready =20min, ΔT use =1.5s, at 100% energy consumption, the average duty cycle of the energy consumption device input signal is 88%; the average input and output cycle is 50ms, that is, ΔT 1_1 +ΔT 2_1 +ΔT 1_2 +ΔT 3_1 =50ms; during the whole process, the DC energy consumption device was collected and switched on and off 30 times, and the duration of each switch was 3ms, that is, ΔT 1_1 +ΔT1_2 =3ms, a total of about 90ms; single input time ΔT 2_1 About 44ms, a total of 1320ms; single exit duration ΔT 3_1 The time between switching on and off is 3ms, and the total time is about 90ms. The current is 1615A and the on-state voltage drop is 3.4V when the module is switched on. The instructions provided by the device manufacturer show that the switching on energy is 8J and the switching off energy is 8.5J, which means that the switching on and off loss of a single module is 16.5J. According to relevant standards such as GB / T 35702 and IEC62751, the loss rate of the voltage-equalizing resistor is about 50W, and the loss rate of the control board is about 20W. The withdrawal period (ΔT 3_1 )Switching loss, switching period (ΔT 1_1 +ΔT 1_2 ) conduction loss, the power device loss during the operation of the DC energy-consuming valve (the energy-consuming valve has a total of 432 submodules) can be calculated, E 投退 =16.5×30×432=213.84kJ,E 投入 =1615×3.4×432×1.32=3131.187kJ, other losses in energy consumption process E 其他 =(50+20)×432×1.5=45.36kJ, hot standby state loss E1=(50+20)×432×20×60=36288kJ, energy consumption process loss E5=E 投退 +

[0052] E 投入 +E 其他 =3390.387 kJ, from which we can get the average loss rate of the energy-consuming valve from this time to the next time it is put into use

[0053]

[0054] Similarly, when calculating the energy consumption rate of the energy consumption valve, the exit period (ΔT 3_1 ) loss, then the energy consumption process loss E5=E 投退 +E 投入 +E 退出 +E 其他 The remaining calculations have been clearly described in Method Example 2 and will not be repeated here.

[0055] System Example:

[0056] A system for calculating energy consumption valve loss of a DC energy consumption device of the present invention includes a processor, and the processor executes computer program instructions to implement a method for calculating energy consumption valve loss of a DC energy consumption device introduced in method embodiment 1 and method embodiment 2. The method has been introduced clearly enough in method embodiment 1 and method embodiment 2 and will not be repeated here.

Claims

1. A method for calculating the loss of energy-consuming valves of a DC energy-consuming device, characterized in that: The method comprises the following steps: dividing the working state of the energy-consuming valve of a direct current energy-consuming device into a hot standby state and an energy-consuming state; calculating and obtaining the loss rate of the hot standby state; further dividing the energy-consuming state into at least the on-off stage in which the number of submodules of the energy-consuming device is from the maximum to the minimum and from the minimum to the maximum, and the on-off stage in which the number of submodules of the energy-consuming device is the smallest; calculating the on-off loss rate of energy consumption in the on-off stage under the duration of the energy-consuming state; calculating the on-off loss rate of energy consumption in the on-off stage under the duration of the energy-consuming state according to the on-current, the conduction voltage drop, the number of submodules of the energy-consuming valve and the duration of the on-off stage collected from the energy-consuming state of a complete direct current energy-consuming device, and obtaining the energy-consuming state loss rate of the energy-consuming valve of the direct current energy-consuming device under the energy-consuming state according to the on-off loss rate and the on-off loss rate; and calculating the average loss rate of the energy-consuming valve of the direct current energy-consuming device according to the hot standby state loss rate, the duration of the hot standby state, the energy-consuming state loss rate and the duration of the energy-consuming state.

2. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 1, characterized in that: The average loss rate P2 of the energy-consuming valve of the DC energy-consuming device is calculated by the following formula: P2=((P1×ΔT ready )+(P3×ΔT use )) / (ΔT ready +ΔT use ) Among them, P1 is the loss rate of hot standby state, P3 is the loss rate of energy consumption state, ΔT ready is the hot standby time, ΔT use It is the duration of energy consumption state.

3. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 2, characterized in that: The loss rate in the hot standby state includes the loss rate of capacitors, voltage-equalizing resistors and boards; the loss rate of capacitors, voltage-equalizing resistors and boards is calculated based on the relevant standards of GB / T35702 and IEC62751.

4. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 2, characterized in that: According to the corresponding project, the time interval between two adjacent maximum energy absorption of the DC energy consumption device is obtained as the duration of a single hot standby state, and the continuous maximum input time of the DC energy consumption device is obtained as the duration of a single energy consumption state.

5. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 1, characterized in that: The single switching loss is obtained according to the device parameters of the DC energy consumption device; the number of energy consumption valve submodules, the duration of the switching phase and the number of switching in and out of the energy consumption phase under the energy consumption state are obtained according to the corresponding project.

6. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 1, characterized in that: The energy consumption state loss rate is the sum of the investment and withdrawal loss rate, the input loss rate and other loss rates; the other loss rates are obtained according to the relevant standards of GB / T35702 and IEC62751.

7. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 1, characterized in that: The investment loss rate is the single investment loss multiplied by the number of investment and withdrawal times multiplied by the number of energy-consuming valve sub-modules divided by the duration of the energy-consuming state; the input loss rate is the input current multiplied by the conduction voltage drop multiplied by the number of energy-consuming valve sub-modules multiplied by the duration of the investment phase divided by the duration of the energy-consuming state.

8. The method for calculating the energy loss of the energy-consuming valve of a DC energy-consuming device according to claim 1, characterized in that: The energy consumption state is further divided into an exit stage in which the number of sub-modules put into operation in the energy consumption device is the largest. The exit loss rate of the exit stage loss under the energy consumption state duration is also calculated. The energy consumption state loss rate of the energy consumption valve of the DC energy consumption device under the energy consumption state is obtained based on the exit loss rate, the exit loss rate and the input loss rate.

9. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 8, characterized in that: The exit loss rate can be obtained through experiments, off-line calibration or instructions provided by the device manufacturer.

10. A method for calculating the loss of energy-consuming valves of a DC energy-consuming device, characterized in that: The method comprises the following steps: dividing the working state of the energy-consuming valve of a direct current energy-consuming device into a hot standby state and an energy-consuming state; calculating and obtaining the hot standby state loss of a single hot standby state; further dividing the energy-consuming state into at least the on-off stage when the number of submodules of the energy-consuming device is from the maximum to the minimum and from the minimum to the maximum, and the on-off stage when the number of submodules of the energy-consuming device is the smallest; calculating the on-off loss of the on-off stage; calculating the on-off loss of the on-off stage according to the on-off current, the conduction voltage drop, the number of energy-consuming valve submodules and the duration of the on-off stage collected from the energy-consuming state of a complete direct current energy-consuming device; obtaining the energy-consuming state loss of the energy-consuming valve of the direct current energy-consuming device in the energy-consuming state according to the on-off loss and the on-off loss; and calculating the average loss rate of the energy-consuming valve of the direct current energy-consuming device according to the hot standby state loss, the duration of the hot standby state, the energy-consuming state loss and the duration of the energy-consuming state.

11. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 10, characterized in that: The average loss rate P2 of the energy-consuming valve of the DC energy-consuming device is calculated by the following formula: P2=(E1+E5) / (ΔT ready +ΔT use ) Among them, E1 is the loss in hot standby state, E5 is the loss in energy consumption state, ΔT ready is the hot standby time, ΔT use It is the duration of energy consumption state.

12. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 11, characterized in that: The loss in the hot standby state includes the loss of capacitors, equalizing resistors and boards; the loss in the hot standby state is the hot standby loss rate multiplied by the hot standby time; the loss rate of capacitors, equalizing resistors and boards is calculated based on the relevant standards of GB / T35702 and IEC62751.

13. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 11, characterized in that: According to the corresponding project, the time interval between two adjacent maximum energy absorption of the DC energy consumption device is obtained as the duration of a single hot standby state, and the continuous maximum input time of the DC energy consumption device is obtained as the duration of a single energy consumption state.

14. The method for calculating energy consumption valve loss of a DC energy consumption device according to claim 10, characterized in that: The single switching loss is obtained according to the device parameters of the DC energy consuming device; the number of energy consuming valve submodules, the duration of the switching phase and the number of switching times are obtained according to the corresponding project.

15. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 10, characterized in that: The energy consumption state loss is the sum of the investment and withdrawal loss, the investment loss and other losses; the other losses are other loss rates multiplied by the number of energy-consuming valve submodules and then multiplied by the duration of the energy consumption state; the other loss rates are obtained according to the relevant standards of GB / T35702 and IEC62751.

16. The method for calculating energy consumption valve loss of a DC energy consumption device according to claim 10, characterized in that: The investment loss is the single investment loss multiplied by the number of investment times multiplied by the number of energy-consuming valve modules; the input loss is the current multiplied by the conduction voltage drop multiplied by the number of energy-consuming valve modules multiplied by the duration of the input stage.

17. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 10, characterized in that: The energy consumption state is further divided into an exit stage in which the number of sub-modules put into operation in the energy consumption device is the largest. The exit loss of the exit stage loss under the energy consumption state duration is also calculated. The energy consumption state loss of the energy consumption valve of the DC energy consumption device under the energy consumption state is obtained based on the input and output loss, exit loss and input loss.

18. The method for calculating the energy consumption valve loss of a DC energy consumption device according to claim 17, characterized in that: The exit loss is a single exit loss rate multiplied by the number of exits and then multiplied by the number of energy-consuming valve submodules; the exit loss rate can be obtained through experiments, offline calibration or the instructions provided by the device manufacturer.

19. A DC energy consuming device energy consuming valve loss calculation system, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the method for calculating the energy consumption valve loss of a DC energy consumption device according to any one of claims 1 to 18.

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