A direct current power distribution network source-load-storage adaptive power distribution method

Abstract

The application provides a DC power distribution network source-load-storage self-adaptive power distribution method based on flexible droop control, aiming at coordinating the logical relationship between the maximum power constraint of new energy, the residual capacity constraint of energy storage equipment and the controllable range constraint of load and the voltage-power droop control in the DC power distribution network, meanwhile, the application determines a droop coefficient setting method in the form of power standard, provides a unified droop coefficient setting rule for equipment of different categories, capacities and rated powers, and ensures that each equipment can determine the quota participating in the self-adaptive power distribution according to the current working condition under the droop coefficient setting scheme, compared with the existing scheme, the self-adaptability of the power distribution among the source, the load and the storage in the DC power distribution system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current power distribution network energy storage control, in particular to a direct current power distribution network source-load-storage adaptive power distribution method, device, apparatus and computer storage medium. BACKGROUND

[0002] In the existing technology, in recent years, with the continuous improvement of urbanization level in China, the voice of energy saving and environmental protection is rising, the requirements for power supply quality and safe power use are becoming more stringent, and the direct current power distribution technology has attracted widespread attention, mainly in the following aspects: (1) The terminal appliances using intelligent power electronic control, such as lighting devices, variable frequency power devices, electronic information devices, etc., can use direct current power supply; (2) Distributed new energy power generation grows rapidly, and such power generation units generally output power in the form of direct current; (3) User-side energy storage develops rapidly, and modern communication and information processing equipment, remote monitoring equipment and security monitoring system have high requirements for power supply continuity and power supply quality, and power storage becomes the main power supply guarantee measure; (4) The harmonic pollution of the distribution system is serious, and the harmonic current generated by various nonlinear loads in the existing medium and low voltage distribution system is directly fed into the public power system, causing harmonic pollution. The key to realizing the optimization of energy among power sources, loads and energy storage in the direct current power distribution network is to realize the parallel operation control of each converter, and the power distribution control method of source-load-storage in the direct current power distribution network plays a decisive role in the safe and reliable, efficient and optimized operation of the system.

[0003] At present, the existing technology proposes a hierarchical control method based on droop control, which realizes the parallel operation of each converter without interconnection line through voltage-current droop control, but this method does not consider the maximum power output limitation of new energy power sources; the existing technology proposes a voltage-power dynamic droop control based on the state of charge of the energy storage module, but this method does not consider the power matching relationship between energy storage and new energy; the existing technology proposes a segmented control method based on bus voltage level, but this method requires a usually large floating range of bus voltage, and the number of power sources and loads connected needs to be reset to set the segmented voltage level in each converter, which is not easy for the expansion application of the system.

[0004] In the existing flexible droop control method, the droop coefficients of each device are uniformly set without considering the limitations of device categories, capacities and power, so that the power distribution adaptability is low. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the low power distribution adaptability in the existing technology.

[0006] To solve the above technical problems, the present application provides a direct current power distribution network source-load-storage adaptive power distribution method, device, apparatus and computer storage medium, which comprises:

[0007] The ratio of the droop coefficient unit value to the rated power of the DC power distribution system is set as the droop coefficient of the DC power distribution DC / AC converter;

[0008] The ratio of the droop coefficient unit value to the current maximum power point of the new energy source is set as the droop coefficient of the new energy source DC / DC converter;

[0009] The ratio of the droop coefficient unit value to the rated power of the load is set as the droop coefficient of the controllable load DC / DC converter;

[0010] The ratio of the droop coefficient unit value to the product of the current battery state of charge and the energy storage rated power is set as the droop coefficient of the energy storage device DC / DC converter;

[0011] Adaptive power distribution is performed according to the droop coefficients of the devices.

[0012] Preferably, the adaptive power distribution according to the droop coefficients of the devices comprises:

[0013] The bus voltage of the current DC power distribution system is determined by the DC power distribution DC / AC converter according to the total power fed into the mains by the current DC power distribution system and the droop coefficient of the DC power distribution DC / AC converter;

[0014] The current output power is updated by the new energy source DC / DC converter according to the current maximum power point of the new energy source, the bus voltage and the droop coefficient of the new energy source DC / DC converter;

[0015] The current load power is updated by the controllable load DC / DC converter within the load power regulation range according to the bus voltage and the droop coefficient of the controllable load DC / DC converter;

[0016] The current charge-discharge power is updated by the energy storage device DC / DC converter within the remaining capacity range of the energy storage device according to the bus voltage and the droop coefficient of the energy storage device DC / DC converter;

[0017] The total power fed into the mains by the current DC power distribution system is updated according to the current output power, the current load power and the current charge-discharge power.

[0018] Preferably, the determination of the bus voltage of the current DC power distribution system by the DC power distribution DC / AC converter according to the total power fed into the mains by the current DC power distribution system and the droop coefficient of the DC power distribution DC / AC converter comprises:

[0019] The power demand of the DC power distribution system by the upper-level scheduling is met by adjusting the voltage intercept:

[0020] wherein K p and K i are proportional-integral coefficients of a PI module, P gref is the power demand of the upper scheduling to the DC power distribution system, P dc is the total power fed into the mains by the DC power distribution system, and the voltage intercept ΔV is 0 if the DC power distribution system does not need to accept the upper power scheduling;

[0021] The bus voltage V dc of the current DC power distribution system is determined according to the total power fed into the mains by the DC power distribution system and the droop coefficient of the DC / AC converter of the DC power distribution system, and is expressed as V dcref + ΔV - D p1 · P dc , wherein V dcref is a DC bus voltage base value, and D p1 is the droop coefficient of the DC / AC converter of the DC power distribution system.

[0022] Preferably, the updating of the current output power according to the current maximum power point of the new energy power source DC / DC converter, the bus voltage and the droop coefficient of the new energy power source DC / DC converter comprises:

[0023] Adjusting the new energy maximum power tracking voltage intercept according to the current maximum power point of the new energy power source DC / DC converter:

[0024] wherein P n_max is the current maximum power point of the new energy power source DC / DC converter, P PV is the output power, K p_PV and K i_PV are proportional-integral coefficients of a PI module;

[0025] Updating the output power according to the bus voltage and the droop coefficient of the new energy power source DC / DC converter:

[0026] P PV = (V dcref + ΔV PV - V dc ) / D p2

[0027] wherein V dcref is a DC bus voltage base value, V dc is the bus voltage of the current DC power distribution system, and D p2 is the droop coefficient of the new energy power source DC / DC converter.

[0028] Preferably, the controllable load DC / DC converter updates the current load power P according to the bus voltage V and the droop coefficient D of the controllable load DC / DC converter within the load power regulation range: load = (V dcref + ΔV - V dc ) / D p3 load_min ≤ P load ≤ P load_max , wherein P load_max is the maximum power of the controllable load, P load_min is the minimum power of the controllable load, V dcref is the DC bus voltage base value, V dc is the bus voltage of the current DC power distribution system, ΔV is the voltage intercept, and D p3 is the droop coefficient of the controllable load DC / DC converter.

[0029] Preferably, the energy storage device DC / DC converter updates the current charge-discharge power P according to the bus voltage V and the droop coefficient D of the energy storage device DC / DC converter within the energy storage device remaining capacity allowed range:

[0030] P bat = (V dcref + ΔV - V dc ) / D p4

[0031] D p4 = D pn · P n = D pn · SOC · P n_bat (SOC min ≤ SOC ≤ SOC max )

[0032] , wherein V dcref is the DC bus voltage base value, V dc is the bus voltage of the current DC power distribution system, ΔV is the voltage intercept, D pn is the droop coefficient unit value, P n is the unit power base value, P n_bat is the energy storage rated power, SoC is the energy storage remaining capacity, SOC max is the maximum remaining capacity allowed by the energy storage device, SOC min is the minimum remaining capacity allowed by the energy storage device, and D p4 is the droop coefficient of the energy storage device DC / DC converter.

[0033] Preferably, when the energy storage remaining capacity reaches the maximum or minimum value, the current charge-discharge power is 0. ​

[0034] The application further provides a device for adaptive power distribution of a source-load-storage of a direct current power distribution network, comprising:

[0035] a droop coefficient setting module of a direct current power distribution DC / AC converter, configured to set a ratio of a droop coefficient unit value to a rated power of the direct current power distribution system as a droop coefficient of the direct current power distribution DC / AC converter;

[0036] a droop coefficient setting module of a new energy power source DC / DC converter, configured to set a ratio of a droop coefficient unit value to a current maximum power point of the new energy as a droop coefficient of the new energy power source DC / DC converter;

[0037] a droop coefficient setting module of a controllable load DC / DC converter, configured to set a ratio of a droop coefficient unit value to a rated power of the load as a droop coefficient of the controllable load DC / DC converter;

[0038] a droop coefficient setting module of a storage device DC / DC converter, configured to set a ratio of a droop coefficient unit value to a product of a current battery state of charge and a storage rated power as a droop coefficient of the storage device DC / DC converter;

[0039] an adaptive power distribution module, configured to perform adaptive power distribution according to the droop coefficients of the devices.

[0040] The application further provides a device for adaptive power distribution of a source-load-storage of a direct current power distribution network, comprising:

[0041] a memory configured to store a computer program, and a processor configured to execute the computer program to realize the steps of the method.

[0042] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the method.

[0043] The above technical solution of the application has the following advantages compared with the prior art:

[0044] The application provides a DC power distribution network source-load-storage adaptive power distribution method based on flexible droop control, aiming at coordinating the logical relationship between the maximum power constraint of new energy, the remaining capacity constraint of energy storage equipment and the controllable range constraint of load and the voltage-power droop control in the DC power distribution network, and determining the droop coefficient setting method in the form of power standard, providing a unified droop coefficient setting rule for equipment of different categories, capacities and rated powers, and ensuring that each equipment can determine the quota participating in adaptive power distribution according to the current working condition under the droop coefficient setting scheme, compared with the existing scheme, the adaptability of power distribution between source, load and storage in the DC power distribution system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in combination with the drawings, in which:

[0046] Figure 1 is the implementation flowchart of the DC power distribution network source-load-storage adaptive power distribution method of the application;

[0047] Figure 2 is the DC power distribution network source-load-storage system connection structure block diagram corresponding to the flexible droop control method proposed by the application;

[0048] Figure 3 is the flexible droop control block diagram of the DC / AC converter of the DC power distribution proposed by the application;

[0049] Figure 4 is the flexible droop control block diagram of the DC / DC converter of the new energy type power supply proposed by the application;

[0050] Figure 5 is the flexible droop control block diagram of the controllable load DC / DC converter proposed by the application;

[0051] Figure 6 is the flexible droop control block diagram of the energy storage DC / DC converter proposed by the application;

[0052] Figure 7 is the structure block diagram of the device for DC power distribution network source-load-storage adaptive power distribution provided by the embodiment of the application. DETAILED DESCRIPTION

[0053] The core of the application is to provide a DC power distribution network source-load-storage adaptive power distribution method, device, equipment and computer storage medium, which improves the adaptability of power distribution between source, load and storage in the DC power distribution system.

[0054] For the person skilled in the art to better understand the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] Please refer to Figure 1 , Figure 1 The implementation flowchart of the direct current power distribution network source-load-storage adaptive power distribution method provided by the present application; the specific operation steps are as follows:

[0056] A uniform numerical droop coefficient unit value D is used in the flexible droop control of each device converter pn , P n is the actual droop coefficient D p = D pn / P n . Among them, the power base value of the direct current distribution DC / AC converter is the system rated power P n_sys , the power base value of the new energy type power source DC / DC converter is the current maximum output power P n_max , the power base value of the direct current load DC / DC converter is the rated power of the load P n_load , and the power base value of the energy storage DC / DC converter is P n P n = SoC·P n_bat , SoC is the state of charge of the battery, which can represent the remaining capacity of the energy storage device, and P n_bat is the rated power of the energy storage.

[0057] S101: Set the ratio of the droop coefficient unit value to the rated power of the direct current distribution system as the droop coefficient of the direct current distribution DC / AC converter;

[0058] S102: Set the ratio of the droop coefficient unit value to the current maximum power point of the new energy as the droop coefficient of the new energy power source DC / DC converter;

[0059] S103: Set the ratio of the droop coefficient unit value to the rated power of the load as the droop coefficient of the controllable load DC / DC converter;

[0060] S104: Set the ratio of the droop coefficient unit value to the product of the current state of charge and the rated power of the energy storage as the droop coefficient of the energy storage device DC / DC converter;

[0061] S105: Perform adaptive power distribution according to the droop coefficients of each device.

[0062] The application provides a DC power distribution network source-load-storage adaptive power distribution method based on flexible droop control, aiming at coordinating the logical relationship between the maximum power constraint of new energy, the remaining capacity constraint of energy storage equipment and the controllable range constraint of load in the DC power distribution network and the voltage-power droop control, and determining the droop coefficient setting method in the form of power standard, providing a unified droop coefficient setting rule for equipment of different categories, capacities and rated powers, and ensuring that each equipment can determine the quota participating in adaptive power distribution according to the current working condition under the droop coefficient setting scheme, compared with the existing scheme, the adaptability of power distribution between source, load and storage in the DC power distribution system is improved.

[0063] Based on the above embodiment, step S105 is further described in detail as follows:

[0064] As shown in Figure 2 , the DC power distribution DC / AC converter is an interface device of the DC power distribution network and the AC power grid, the input is three-phase alternating current, and the output is the DC bus of the DC power distribution system; the distributed new energy power generation equipment is connected to the DC bus through the power source DC / DC converter; the DC load is connected to the DC bus through the load DC / DC converter; and the energy storage equipment is connected to the DC bus through the energy storage DC / DC converter; and the above components are sequentially connected to form the basic topology structure of the DC power distribution system.

[0065] Based on the topology structure as shown in Figure 2 , the overall operation mode is as follows: the DC power distribution AC / DC converter determines the bus voltage of the DC system according to the total power fed into the power grid by the DC system and the droop coefficient; the new energy power source DC / DC converter realizes the maximum power tracking control function according to the flexible droop control; the controllable load DC / DC converter can determine the actual load power according to the current DC bus voltage level and the device droop coefficient within the load power regulation range; and the energy storage equipment DC / DC converter determines the charging and discharging power according to the DC bus voltage level and the device droop coefficient within the SoC allowed range.

[0066] S501: determining the bus voltage of the current DC power distribution system by using the DC power distribution DC / AC converter according to the total power fed into the power grid by the current DC power distribution system and the droop coefficient of the DC power distribution DC / AC converter;

[0067] As shown in Figure 3 , the DC power distribution DC / AC converter flexible droop control block diagram is provided for the application; Figure 3

[0068] The model includes two parts of quadratic droop control and linear droop control, the quadratic droop control satisfies the power demand of the upper dispatch to the DC power distribution system by adjusting the voltage intercept: ​

[0069] wherein, K p and K i are proportional-integral coefficients of the PI module, considering quadratic droop as the control outer ring, the dynamic time constant of the PI control module should be greater than the time constant of the DC power distribution AC / DC device voltage control inner ring, P gref is the power demand of the upper dispatch to the DC power distribution system, P dc is the total power fed into the mains by the DC power distribution system, if the DC power distribution system does not need to accept the upper power dispatch, the voltage intercept AV is 0;

[0070] The primary droop control determines the current bus voltage V dc of the DC power distribution system according to the total power fed into the mains by the DC power distribution system and the droop coefficient of the DC power distribution DC / AC converter. dcref = V p1 + AV-D dc · P dcref , wherein, V p1 is the DC bus voltage base value, D n_max is the droop coefficient of the DC power distribution DC / AC converter.

[0071] S502: using the new energy power supply DC / DC converter to update the current output power according to the current maximum power point of the new energy, the bus voltage and the droop coefficient of the new energy power supply DC / DC converter;

[0072] As Figure 4 shown, Figure 4 is the flexible droop control block diagram of the new energy type power supply DC / DC converter proposed by the application;

[0073] Adjust the new energy maximum power tracking voltage intercept according to the current maximum power point of the new energy:

[0074] wherein, wherein, P n_max is the current maximum power point of the new energy, P PV is the output power, K p_PV and K i_PV are proportional-integral coefficients of the PI module;

[0075] Update the output power according to the bus voltage and the droop coefficient of the new energy power supply DC / DC converter:

[0076] P PV = (V dcref + AV PV -V dc ) / D p2

[0077] D p2 The droop coefficient of the new energy power supply DC / DC converter is given.

[0078] S503: The current load power is updated within the load power adjustment range using the controllable load DC / DC converter based on the bus voltage and the droop coefficient of the controllable load DC / DC converter;

[0079] like Figure 5 As shown, Figure 5 This is a block diagram of the flexible droop control for a controllable load DC / DC converter proposed in this invention, wherein the upper and lower limits of the limiter are the maximum and minimum power adjustment ranges of the controllable load, respectively.

[0080] The above control process can be expressed by the following equation:

[0081] P load =(V dcref +ΔV-V dc ) / D p3 (P load_min ≤P load ≤P load_max )

[0082] Among them, P load_max P is the maximum power of the controllable load. load_min D is the minimum power of a controllable load. p3 The droop coefficient of the controllable load DC / DC converter is given.

[0083] S504: The current charging and discharging power is updated using the DC / DC converter of the energy storage device within the allowable range of the remaining capacity of the energy storage device, based on the bus voltage and the droop coefficient of the DC / DC converter of the energy storage device.

[0084] like Figure 6 As shown, Figure 6 This is a block diagram of the flexible droop control for the energy storage DC / DC converter proposed in this invention. The SoC limiter is used to limit the battery charging and discharging power to 0 when the battery reaches its maximum and minimum remaining capacity. This model can be implemented through D... p The energy storage charging and discharging mode and its dynamic power allocation ratio with other source-load-storage devices in the DC distribution network are determined according to the change in the remaining battery capacity.

[0085] The above control process can be expressed by the following equation:

[0086] P bat =(V dcref +ΔV-V dc ) / D p4

[0087] D p4 = D pn · P n = D pn · SOC · P n_bat (SOC min ≤ SOC ≤ SOC max )

[0088] wherein D pn is the droop coefficient unit value, P n is the power unit base value, P n_bat is the energy storage rated power, SoC is the energy storage remaining capacity, SOC max is the maximum remaining capacity allowed by the energy storage device, SOC min is the minimum remaining capacity allowed by the energy storage device, D p4 is the droop coefficient of the DC / DC converter of the energy storage device.

[0089] S505: updating the total power fed into the mains by the current DC power distribution system according to the current output power, the current load power and the current charge-discharge power.

[0090] Based on the above embodiment, this embodiment takes a typical working condition as an example for further detailed description:

[0091] (1) System power distribution mode under power fluctuation of power supply:

[0092] If the light intensity increases, the maximum power point P n_max of the photovoltaic system increases, thereby increasing the maximum power tracking voltage intercept ΔV PV , and increasing the output power of the photovoltaic system. At this time, since the total power fed into the mains by the DC system increases, the DC bus voltage V dc rises. Assuming that there is no mains up-regulation information at this time, ΔV is 0, and the power allocated to the remaining devices connected to the DC bus is actively reduced, V dc reaches a new balance point after the power distribution of each device is completed. If the light intensity decreases, the change trend of each variable is opposite to the above process.(2) System power distribution mode under change of energy storage remaining capacity:

[0093] If the energy storage remaining capacity SoC decreases and is within the allowed working range, the power unit base value P n decreases. Under the unified D pn setting, the actual droop coefficient D p4 becomes larger, and at the current bus voltage level, the real-time power P bat allocated to the energy storage at this time becomes smaller. If no power fluctuation occurs in other devices in the system at this time, as the total power fed into the grid by the DC system decreases, the DC bus voltage V dcdecrease, assuming that there is no power grid upper dispatching information at this time, ΔV is 0, the power allocated to the remaining devices connected to the DC bus is actively increased, V dc After the power distribution of each device is completed, a new balance point is reached.

[0094] (3) System power distribution mode under the change of controllable DC load:

[0095] If a new controllable DC load is connected to the system, the rated power P n_load and the total droop coefficient D pn of the device can be determined to determine the load power currently allocated to the device, for the load with larger rated power, the actual droop coefficient D p3 is smaller, the load power reference value P load after adaptive distribution is larger, at the same time, with the increase of the power consumption of the system, the total power fed into the power grid is reduced, the DC bus voltage V dc decreases, assuming that there is no power grid upper dispatching information at this time, ΔV is 0, the power allocated to the remaining devices connected to the DC bus is actively increased, V dc After the power distribution of each device is completed, a new balance point is reached.

[0096] Droop control is the main solution for source-load power distribution in the current DC distribution network, and the application provides a DC distribution network source-load-storage adaptive power distribution method based on flexible droop control, which aims to coordinate the logical relationship between the maximum power constraint of new energy, the remaining capacity constraint of storage device and the controllable range constraint of load and the voltage-power droop control in the DC distribution network, and determines the droop coefficient setting method of the source, load and storage control unit, so that different devices can present consistent voltage-power external characteristics based on their working conditions. The application can not only adaptively distribute source-storage-load power through flexible droop control, but also meet the requirements of new energy steady-state maximum power output, safe capacity region operation of storage and controllable interval operation of load, which is beneficial to realize the "plug and play" of devices and improve the power regulation flexibility of DC distribution network and the stability of DC bus voltage. The application solves the difficulty of droop coefficient setting in the prior art, and determines the droop coefficient setting method in the form of power standard, which provides a unified droop coefficient setting rule for devices of different categories, capacities and rated powers, and ensures that each device can determine the amount of adaptive power distribution according to the current working condition under the droop coefficient setting scheme. Compared with the existing scheme, the adaptability of power distribution among source, load and storage in the DC distribution system is improved.

[0097] Please refer to Figure 7 , Figure 7 The application provides a structure block diagram of a DC distribution network source-load-storage adaptive power distribution device, and the specific device can include:

[0098] The DC power distribution DC / AC converter droop coefficient setting module 100 is configured to set the ratio of the droop coefficient unit value to the rated power of the DC power distribution system as the droop coefficient of the DC power distribution DC / AC converter.

[0099] The new energy power source DC / DC converter droop coefficient setting module 200 is configured to set the ratio of the droop coefficient unit value to the current maximum power point of the new energy as the droop coefficient of the new energy power source DC / DC converter.

[0100] The controllable load DC / DC converter droop coefficient setting module 300 is configured to set the ratio of the droop coefficient unit value to the rated power of the load as the droop coefficient of the controllable load DC / DC converter.

[0101] The energy storage device DC / DC converter droop coefficient setting module 400 is configured to set the ratio of the droop coefficient unit value to the product of the current battery state of charge and the energy storage rated power as the droop coefficient of the energy storage device DC / DC converter.

[0102] The adaptive power distribution module 500 is configured to perform adaptive power distribution according to the droop coefficients of the devices.

[0103] The DC power distribution network source-load-storage adaptive power distribution device of the embodiment is used to implement the aforementioned DC power distribution network source-load-storage adaptive power distribution method, and thus the specific embodiments in the DC power distribution network source-load-storage adaptive power distribution device can be seen from the foregoing embodiment part of the DC power distribution network source-load-storage adaptive power distribution method. For example, the DC power distribution DC / AC converter droop coefficient setting module 100, the new energy power source DC / DC converter droop coefficient setting module 200, the controllable load DC / DC converter droop coefficient setting module 300, the energy storage device DC / DC converter droop coefficient setting module 400, and the adaptive power distribution module 500 are respectively used to implement the steps S101, S102, S103, S104, and S105 in the aforementioned DC power distribution network source-load-storage adaptive power distribution method, and thus the specific embodiments can be referred to the description of the corresponding respective part embodiments, which will not be described herein again.

[0104] The embodiment of the present application further provides a device for DC power distribution network source-load-storage adaptive power distribution, which comprises a memory configured to store a computer program and a processor configured to execute the computer program to implement the steps of the aforementioned DC power distribution network source-load-storage adaptive power distribution method.

[0105] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the aforementioned DC power distribution network source-load-storage adaptive power distribution method.

[0106] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In one

[0107] The processes and logic flows described in this specification can be performed by one or more programmable computers executing one or more computer programs to Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic

[0108] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions that execute on the computer or other programmable apparatus provide steps for implementing the processes Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic Figure 1 The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic

[0110] Obviously, the embodiments described above are only examples and are not intended to limit the present application. Other variations or modifications can be made to the embodiments described above based on the principles of the present application. The present application is not limited to the embodiments described above. Therefore, the scope of the present application should be determined by the following claims.

Claims

1. A DC power distribution network source-load-storage adaptive power distribution method, characterized in that, Comprising: The ratio of the droop coefficient unit value to the rated power of the DC power distribution system is set as the droop coefficient of the DC / AC converter of the DC power distribution system; The ratio of the droop coefficient unit value to the current maximum power point of the new energy source is set as the droop coefficient of the DC / DC converter of the new energy source; The ratio of the droop coefficient unit value to the rated power of the load is set as the droop coefficient of the DC / DC converter of the controllable load; The ratio of the droop coefficient unit value to the product of the current state of charge of the battery and the rated power of the energy storage is set as the droop coefficient of the DC / DC converter of the energy storage device; According to the droop coefficient of each device, adaptive power distribution is carried out, including: The DC / AC converter of the DC power distribution system is used to determine the bus voltage of the current DC power distribution system according to the total power fed into the mains by the current DC power distribution system and the droop coefficient of the DC / AC converter of the DC power distribution system; The DC / DC converter of the new energy source is used to update the current output power according to the current maximum power point of the new energy source, the bus voltage and the droop coefficient of the DC / DC converter of the new energy source; The DC / DC converter of the controllable load is used to update the current load power within the load power regulation range according to the bus voltage and the droop coefficient of the DC / DC converter of the controllable load; The DC / DC converter of the energy storage device is used to update the current charge and discharge power within the allowable range of the remaining capacity of the energy storage device according to the bus voltage and the droop coefficient of the DC / DC converter of the energy storage device; The total power fed into the mains by the current DC power distribution system is updated according to the current output power, the current load power and the current charge and discharge power.

2. The DC power distribution grid source-load-storage adaptive power allocation method of claim 1, wherein, The DC / AC converter of the DC power distribution system is used to determine the bus voltage of the current DC power distribution system according to the total power fed into the mains by the current DC power distribution system and the droop coefficient of the DC / AC converter of the DC power distribution system, including: The power demand of the DC power distribution system by the upper dispatch is met by adjusting the voltage intercept: ; wherein, and is a proportional-integral coefficient of the PI module, is a power demand of the upper dispatch to the DC power distribution system, is a total power fed into the mains by the DC power distribution system, and if the DC power distribution system does not need to accept the upper power dispatch, the voltage intercept is 0. determining a bus voltage of the current DC power distribution system in dependence on a total power fed into the mains by the DC power distribution system and a droop coefficient of the DC power distribution DC / AC converter wherein is a base value of the DC bus voltage, is a droop coefficient of the DC power distribution DC / AC converter.

3. The DC power distribution grid source-load-storage adaptive power allocation method of claim 1, wherein, The DC / DC converter of the new energy source is used to update the current output power according to the current maximum power point of the new energy source, the bus voltage and the droop coefficient of the DC / DC converter of the new energy source, including: The maximum power tracking voltage intercept of the new energy source is adjusted according to the current maximum power point of the new energy source: ； wherein, is the current maximum power point of the new energy, is the output power, and is the proportional-integral coefficient of the PI module. The output power is updated according to the bus voltage and the droop coefficient of the DC / DC converter of the new energy source: =( ) / ； wherein, is a direct current bus voltage base value, is a bus voltage of a current direct current distribution system, is a droop coefficient of the new energy power supply DC / DC converter.

4. The DC power distribution grid source-load-storage adaptive power allocation method of claim 1, wherein, The DC / DC converter of the controllable load is used to update the current load power within the load power regulation range according to the bus voltage and the droop coefficient of the DC / DC converter of the controllable load: ( )， wherein, Pmax is the maximum power of the controllable load, Pmin is the minimum power of the controllable load, Vbase is the DC bus voltage base value, Vbus is the current DC distribution system bus voltage, Vint is the voltage intercept, Kdroop is the droop coefficient of the controllable load DC / DC converter.

5. The DC power distribution grid source-load-storage adaptive power allocation method of claim 1, wherein, The DC / DC converter of the energy storage device is used to update the current charge and discharge power within the allowable range of the remaining capacity of the energy storage device according to the bus voltage and the droop coefficient of the DC / DC converter of the energy storage device: ； ； wherein, is a DC bus voltage base value, is a bus voltage of the current DC power distribution system, is a voltage intercept, is the droop coefficient base value, is a power base value, is a storage rated power, and SoC is a storage state of charge, is a maximum state of charge allowed for the storage device, is a minimum state of charge allowed for the storage device, is a droop coefficient of the storage device DC / DC converter.

6. The DC power distribution grid source-load-storage adaptive power allocation method of claim 5, wherein, When the remaining capacity of the energy storage reaches the maximum or minimum value, the current charge and discharge power is 0.

7. A device for source-load-storage adaptive power distribution of a direct current power distribution network, characterized in that, Comprising: The DC / AC converter of the DC power distribution system is used to determine the bus voltage of the current DC power distribution system according to the total power fed into the mains by the current DC power distribution system and the droop coefficient of the DC / AC converter of the DC power distribution system, including: The power demand of the DC power distribution system by the upper dispatch is met by adjusting the voltage intercept: The new energy power supply DC / DC converter droop coefficient setting module is configured to set the ratio of the droop coefficient unit value to the current maximum power point of the new energy as the droop coefficient of the new energy power supply DC / DC converter. The controllable load DC / DC converter droop coefficient setting module is configured to set the ratio of the droop coefficient unit value to the load rated power as the droop coefficient of the controllable load DC / DC converter. The energy storage device DC / DC converter droop coefficient setting module is configured to set the ratio of the droop coefficient unit value to the product of the current battery state of charge and the energy storage rated power as the droop coefficient of the energy storage device DC / DC converter. The adaptive power distribution module is configured to perform adaptive power distribution according to the droop coefficients of the devices, and includes: The DC distribution DC / AC converter is configured to determine the bus voltage of the current DC distribution system according to the total power fed into the commercial power by the current DC distribution system and the droop coefficient of the DC distribution DC / AC converter. The new energy power supply DC / DC converter is configured to update the current output power according to the current maximum power point of the new energy, the bus voltage and the droop coefficient of the new energy power supply DC / DC converter. The controllable load DC / DC converter is configured to update the current load power according to the bus voltage and the droop coefficient of the controllable load DC / DC converter within the load power regulation range. The energy storage device DC / DC converter is configured to update the current charge-discharge power according to the bus voltage and the droop coefficient of the energy storage device DC / DC converter within the remaining capacity range of the energy storage device. The total power fed into the commercial power by the current DC distribution system is updated according to the current output power, the current load power and the current charge-discharge power.

8. A device for source-load-storage adaptive power distribution in a direct current power distribution grid, characterized by The memory is configured to store a computer program. The processor is configured to implement the steps of the DC distribution network source-load-storage adaptive power distribution method according to any one of claims 1 to 6 when executing the computer program. The computer program is stored on the computer readable storage medium and is executed by the processor to implement the steps of the DC distribution network source-load-storage adaptive power distribution method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, ​

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