Distributed optical storage direct-flexible system and power distribution method

Abstract

The invention discloses a distributed optical storage direct-current flexible system and a power distribution method, belongs to the technical field of optical storage direct-current flexible power distribution, and comprises the distributed optical storage direct-current flexible system and the distributed optical storage direct-current flexible power distribution method. The system comprises a power bus, a control bus, and photovoltaic units, load units, an energy storage unit and a mains supply interface unit which are all connected to the power bus, each photovoltaic unit and each load unit comprise a pulse generation circuit connected to the control bus, and the energy storage unit comprises a battery pack. The pulse generation circuit and the first pulse detection circuit are connected to the control bus. The commercial power interface unit comprises a second pulse detection circuit connected to the control bus. The method comprises the steps that the photovoltaic unit generates electricity and outputs signals, the load unit uses electricity and outputs signals, generated power and load power are compared, and the energy storage unit and the mains supply interface unit carry out charging and discharging. According to the invention, each unit has the capability of adaptively outputting or inputting electric power, and the expandability is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic storage direct flexible power distribution technology, and particularly relates to a distributed photovoltaic storage direct flexible system and a power distribution method. BACKGROUND

[0002] The photovoltaic storage direct flexible system combines photovoltaic power generation, energy storage, direct power distribution and flexible power consumption, and is an important innovation in the energy field. With the generation and development of the technology, the hardware, software and the like are continuously researched in depth, and more and more new supporting devices, control systems and implementation modes appear.

[0003] The existing photovoltaic storage direct flexible system usually needs a central controller to uniformly digitally manage photovoltaic power generation, loads, energy storage and the like in the system, and to perform energy distribution. However, this method relies on software processing, and sometimes the response delay is high due to the program running itself, and more settings are needed when the system is expanded. SUMMARY

[0004] In view of the above defects, the present application provides a distributed photovoltaic storage direct flexible system and a power distribution method, which can enable each unit to have the ability of self-adaptive output or input power, and has good scalability.

[0005] In order to achieve the purpose of the present application, the following technologies are adopted: A distributed photovoltaic storage direct flexible system, comprising a power bus, a control bus, and: a plurality of photovoltaic units, each comprising a pulse generating circuit connected to the control bus; a plurality of load units, each comprising a pulse generating circuit connected to the control bus; an energy storage unit, comprising a battery pack, the rated output power of the battery pack being e, the energy storage unit being pre-provided with a charging threshold electric quantity c and a discharging threshold electric quantity d, the energy storage unit further comprising a pulse generating circuit and a first pulse detection circuit connected to the control bus; a utility interface unit, further connected to a utility grid, the utility interface unit comprising a second pulse detection circuit connected to the control bus; In operation, the pulse generating circuits of all the photovoltaic units, load units, energy storage units and utility interface units output pulse signals to the control bus at mutually non-overlapping frequency ranges, the frequency ranges being the respective frequency bands to which the photovoltaic units, load units, energy storage units and utility interface units belong respectively, and the frequency of the pulse signal linearly corresponding to the power value.

[0006] Further, the pulse generating circuit of the photovoltaic unit generates, in operation, a pulse signal whose frequency positively correlates with the power generation power of the photovoltaic unit.

[0007] Further, the pulse generating circuit of the load unit generates a pulse signal whose frequency is positively related to the load power of the load unit when working.

[0008] Further, the energy storage unit is used for charging or discharging; The energy storage unit is also used for requesting grid feed-in from the utility interface unit and making its pulse generating circuit generate a pulse signal whose frequency is positively related to the grid feed-in power; The energy storage unit is also used for requesting utility supplement from the utility interface unit and making its pulse generating circuit generate a pulse signal whose frequency is positively related to the utility supplement power; The frequency ranges of the pulse signals generated by the pulse generating circuit of the energy storage unit when discharging, charging, requesting grid feed-in and requesting utility supplement do not overlap.

[0009] Further, each pulse generating circuit comprises a voltage sensor, a current sensor, a four-quadrant multiplier and a voltage-controlled oscillator.

[0010] Further, the first pulse detection circuit comprises an analog-to-digital converter, a numerical extraction module, a digital-to-analog converter, an additive frequency mixer, a frequency comparator and a subtractive frequency mixer.

[0011] Further, the second pulse detection circuit comprises a frequency-voltage converter, a voltage comparator, a commutation module and a power control module.

[0012] Further, the frequency range of the pulse signal output by the pulse generating circuit is adjusted by adjusting the frequency corresponding to the lowest frequency of the voltage-controlled oscillator and the voltage-to-frequency conversion gain.

[0013] A distributed photovoltaic energy storage direct flexible power distribution method using a distributed photovoltaic energy storage direct flexible system, comprising the steps of: S100: All photovoltaic units generate power to the power bus, and the pulse generating circuits of all photovoltaic units respectively emit corresponding pulse signals to the control bus, while the running load units use power from the power bus, and the pulse generating circuits of the running load units respectively emit corresponding pulse signals to the control bus; S200: The first pulse detection circuit listens to the pulse signals of the frequency bands to which the photovoltaic units and the load units belong on the control bus, compares the total power generation a corresponding to the pulse signals of the photovoltaic units with the total load power b corresponding to the pulse signals of the load units, if a > b, executes S300, if a < b, executes S400, and if a = b, executes S600; S300: The energy storage unit queries its remaining power s, if s < c, the energy storage unit charges from the power bus at a-b power, and then executes S600, if s ≥ c, the energy storage unit does not charge and discharge, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to a-b as the back-to-grid power to the control bus, and then executes S500; S400: The energy storage unit executes the selection of discharging and / or power supply, if only discharging, then executes S600, otherwise executes S500; S500: The second pulse detection circuit listens to the pulse signal of the frequency band of the energy storage unit on the control bus; If the pulse signal corresponds to the state that the energy storage unit requests back-to-grid from the power supply interface unit, the power flow direction is set to from the power bus to the power grid, and back-to-grid is performed at a-b power, and then S600 is executed; If the pulse signal corresponds to the state that the energy storage unit requests power supply from the power supply interface unit, the power flow direction is set to from the power grid to the power bus, and power supply is performed at the power corresponding to the frequency of the pulse signal, and then S600 is executed; If no pulse signal corresponding to the request for back-to-grid or power supply is listened to, S600 is directly executed; S600: Wait for a preset period z, and return to S100.

[0014] Further, S400 includes: S410: The energy storage unit queries its remaining power s, if s > d, S420 is executed, if s ≤ d, S450 is executed; S420: Determine whether b-a > e, if yes, S430 is executed, if no, S440 is executed; S430: The energy storage unit discharges to the power bus at e power, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to b-a-e as the power supply power to the control bus, and then executes S500; S440: The energy storage unit discharges to the power bus at b-a power, and then executes S600; S450: The energy storage unit does not charge and discharge, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to b-a as the power supply power to the control bus, and then executes S500.

[0015] The beneficial effects of the technical solution are: 1. Unlike existing photovoltaic-storage-direct-drive-flexible systems, this system does not require a central controller to digitally control various units. Instead, each unit is equipped with a pulse generation circuit and / or pulse detection circuit to match power information and control requests into pulse signals of different frequencies, which are broadcast and received on the control bus. This allows the system to primarily rely on analog circuits for energy management and control. Analog circuits have fast response times, typically in the microsecond range, and are directly driven by signals, eliminating the need for software processing cycles. They can cope with rapid changes such as sudden changes in illumination and load impacts, and have strong anti-interference capabilities.

[0016] 2. Each unit has self-adjusting capabilities, and newly added units can be quickly added to the system for operation without the need for complex configuration of a central controller, which greatly improves scalability. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the distributed optical storage direct current flexible system according to an embodiment of this application is shown.

[0018] Figure 2 The flowchart illustrating the main steps of the distributed photovoltaic-storage-DC-flexible power distribution method according to an embodiment of this application is shown.

[0019] Figure 3 A flowchart of S400 of the distributed photovoltaic-storage-DC-flexible power distribution method according to an embodiment of this application is shown.

[0020] Figure 4 The diagram shows the connection structure of the pulse generation circuit of the distributed optical storage DC-flexible system according to an embodiment of this application.

[0021] Figure 5 The diagram shows the connection structure of the first pulse detection circuit of the distributed optical storage DC-flexible system according to an embodiment of this application.

[0022] Figure 6 The diagram shows the connection structure of the second pulse detection circuit of the distributed optical storage DC-flexible system according to an embodiment of this application. Detailed Implementation

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 The distributed photovoltaic-storage-DC-flexible system shown includes a power bus, a control bus, and photovoltaic units, load units, energy storage units, and mains interface units, all connected to the power bus.

[0025] The number of photovoltaic units is limited, and each unit includes a pulse generation circuit connected to the control bus. The number of photovoltaic units can be expanded.

[0026] The number of load units is several, and each load unit includes a pulse generating circuit connected to the control bus. The number of load units supports expansion.

[0027] The energy storage unit includes a battery pack, and the rated output power of the battery pack is e. The energy storage unit is preconfigured with a charging threshold power c and a discharging threshold power d. In this embodiment, c>d. The energy storage unit further includes a pulse generating circuit and a first pulse detection circuit connected to the control bus.

[0028] The utility interface unit is also connected to the utility grid. The utility interface unit includes a second pulse detection circuit connected to the control bus.

[0029] In operation, the pulse generating circuits of all the photovoltaic units, load units, energy storage units, and utility interface units output pulse signals to the control bus at mutually non-overlapping frequency ranges. The frequency ranges are the respective frequency bands to which the photovoltaic units, load units, energy storage units, and utility interface units belong, respectively. The frequency of the pulse signal linearly corresponds to the power value.

[0030] As shown in FIG. 1, each pulse generating circuit includes a voltage sensor, a current sensor, a four-quadrant multiplier, and a voltage-controlled oscillator. Figure 4 In operation, the voltage sensor is used to collect the voltage output or input by the unit in which the voltage sensor is located. The current sensor is used to collect the current output or input by the unit in which the current sensor is located. The signals of the voltage sensor and the current sensor are input to the four-quadrant multiplier to obtain a power signal. The power signal is input to the voltage-controlled oscillator from the four-quadrant multiplier to generate a power frequency F. The frequency range of the pulse signal output by the pulse generating circuit is adjusted by adjusting the frequency corresponding to the lowest frequency and the voltage-to-frequency conversion gain of the voltage-controlled oscillator. Specifically, F=F min +kP, F min is the frequency corresponding to the lowest frequency, k is the voltage-to-frequency conversion gain, both of which can be preconfigured, and P is the output or input power of the circuit in which the pulse generating circuit is located. More specifically, the voltage sensor is a Hall effect voltage sensor, and optional specifications include LEMLV100 and CHV-50P. The current sensor is a Hall effect current sensor, and optional specifications include LEMHASS50-S, ACS758, and CSNE151. The four-quadrant multiplier is AD633, which has five input terminals X1, X2, Y1, Y2, and Z. In operation, X1 is connected to the voltage signal, Y1 is connected to the current signal, and the other input terminals are grounded. The output function is W=(X1-X2)*(Y1-Y2) / 10+Z. When AD633 is used, a ×10 amplifier needs to be added to the output terminal of AD633 to offset the bias. The voltage-controlled oscillator is LM331, and F min is set by adjusting the bias voltage at the input terminal of LM331, and k is adjusted by adjusting a variable resistor connected to one pin of LM331.

[0031] As an embodiment: the pulse generating circuit of the photovoltaic unit generates a pulse signal whose frequency is positively correlated with the power generated by the photovoltaic unit when the photovoltaic unit is working; the pulse generating circuit of the load unit generates a pulse signal whose frequency is positively correlated with the load power of the load unit when the load unit is working.

[0032] When the energy storage unit is discharging, the pulse generating circuit of the energy storage unit generates a pulse signal whose frequency is positively correlated with the discharging power of the energy storage unit; when the energy storage unit is charging, the pulse generating circuit of the energy storage unit generates a pulse signal whose frequency is positively correlated with the charging power of the energy storage unit; the energy storage unit is further configured to request grid feed-in from the grid interface unit and make the pulse generating circuit thereof generate a pulse signal whose frequency is positively correlated with the grid feed-in power; the energy storage unit is further configured to request grid supplement from the grid interface unit and make the pulse generating circuit thereof generate a pulse signal whose frequency is positively correlated with the grid supplement power; the frequency ranges of the pulse signals generated by the pulse generating circuit of the energy storage unit when discharging, charging, requesting grid feed-in and requesting grid supplement do not overlap.

[0033] For example, the number of photovoltaic units is five, and the rated power of each is 500W. For the first photovoltaic unit, the pulse signal frequency range output by the pulse generating circuit thereof is 1kHz~1.5kHz, that is, the F min is 1kHz, and the k value is 1Hz / W, that is, when the power is 0, the F is 1kHz, and when the power is 500W, the F is 1.5kHz. The pulse signal frequency range of the second photovoltaic unit is 2kHz~2.5kHz, the pulse signal frequency range of the third photovoltaic unit is 3kHz~3.5kHz, the pulse signal frequency range of the fourth photovoltaic unit is 4kHz~4.5kHz, and the pulse signal frequency range of the fifth photovoltaic unit is 5kHz~5.5kHz. The k values of the pulse generating circuits of these units are all 1Hz / W. Meanwhile, the total pulse output frequency range of the photovoltaic units can be set to 1kHz~9.9kHz, so as to reserve several frequency ranges greater than 5.9kHz for use by new photovoltaic units.

[0034] Meanwhile, suppose the number of load units is three, and the maximum load power of each is 800W. The k values of the pulse generating circuits of the load units are all 1Hz / W. The pulse signal frequency range of the first load unit is 11kHz~11.8kHz, the pulse signal frequency range of the second load unit is 12kHz~12.8kHz, and the pulse signal frequency range of the third load unit is 13kHz~13.8kHz. The total pulse output frequency range of the load units is set to 11kHz~19.9kHz, so as to reserve several frequency ranges for use by new load units.

[0035] At the same time, assuming that the rated input power and the rated output power e of the energy storage unit are both 1800W, and the k value of the pulse generating circuit is 0.5kHz / W. When the energy storage unit discharges, the pulse signal frequency band output by the pulse generating circuit is 20kHz~29kHz, when the energy storage unit charges, the pulse signal frequency band output by the pulse generating circuit is 30kHz~39kHz, when the energy storage unit requests power from the power grid interface unit for online, the pulse signal frequency band output by the pulse generating circuit is 40kHz~59kHz, which is used to request power from 0W to 3800W, and when the energy storage unit requests the power grid interface unit for power grid supplement, the pulse signal frequency band output by the pulse generating circuit is 51kHz~69kHz, which is used to request power grid supplement from 0W to 3800W, the maximum power has exceeded the total maximum power of the current load unit, but in order to facilitate subsequent expansion, it can be set larger.

[0036] As another implementation, each of the above positive correlations can be replaced by a negative correlation.

[0037] As a further implementation, the positive and negative of each power-frequency correlation mode can be different, because only a linear correlation between power and frequency is required, and the above mode is only for ease of example.

[0038] For example, as shown in FIG. 1, the power-frequency correlation mode of the energy storage unit is as follows: Figure 5As shown, the first pulse detection circuit includes an analog-to-digital converter, a numerical extraction module, a digital-to-analog converter, an addition frequency mixer, a frequency comparator, and a subtraction frequency mixer. In operation, the analog-to-digital converter converts the pulse signals of the pulse generation circuits of the photovoltaic units and the pulse signals of the pulse generation circuits of the load units into digital signals. Since each unit has its own frequency band, only the individual frequency signals of each unit need to be obtained within a predetermined time period. The numerical extraction module is used to extract frequency values according to a predetermined rule, for example, the last three digits in the frequency. For example, according to the first embodiment, the frequency of the pulse signal of the pulse generation circuit of a certain photovoltaic unit is 1250 kHz, and the last three digits "250" are taken. The frequency of the pulse signal of the pulse generation circuit of a certain load unit is 11300 Hz, and the last three digits "300" are taken. The frequencies of the pulse signals of all photovoltaic units and the frequencies of the pulse signals of all load units are obtained, converted into analog signals by the digital-to-analog converter, and then added together. The two added values are compared by the frequency comparator to determine the size relationship between the total power of the photovoltaic units and the total load power of the load units. The difference between the two totals can be calculated by the subtraction frequency mixer. Specifically, the optional specifications of the analog-to-digital converter include ADS1115, ADS7953, etc. The optional specifications of the digital-to-analog converter include MCP4728, MCP4922, etc. The optional specifications of the addition frequency mixer include Mini-circuits ADE-3G (+) MINI, Analog Devices ADL5811 / 5812, etc. The frequency comparator uses MAX9382, and the subtraction frequency mixer uses INA143. The numerical extraction module in the first pulse detection circuit requires program control, which is implemented by ARMCortex-M0 in this embodiment. However, the energy storage unit usually has a physical form of an energy storage cabinet, which has its own digital processing capability. Therefore, the system uses digital signal processing at this point, and the remaining parts still mainly use analog signals.

[0039] The second pulse detection circuit comprises a frequency-voltage converter, a voltage comparator, a commutation module and a power control module. In operation, the frequency-voltage converter receives pulse signals output by the pulse generation circuit of the energy storage unit, the pulse signals including two kinds of pulse signals corresponding to the request for back online and the request for mains power supplement. Since the two kinds of signals are in two different frequency bands, the signals are converted by the frequency-voltage converter and then compared by the voltage comparator, so that the two kinds of signals can be identified. After identification, the power flow direction through the mains interface unit is changed by the commutation module, and the power passing through is controlled by the power control module. Specifically, the frequency-voltage converter can adopt the frequency-voltage conversion (FVC) mode of LM331, the voltage comparator can be selected from the specifications including LM339, LM393 and the like, the commutation module uses an H-bridge circuit (the current direction of a motor or other load is changed by controlling MOSFET or IGBT through a specific logic) or a bidirectional power switching device. The power control module adopts a thyristor module.

[0040] As shown in Figure 2 , the distributed photovoltaic energy storage direct flexible power distribution method using the above distributed photovoltaic energy storage direct flexible system is operated according to the following steps: S100: All photovoltaic units generate power to the power bus, and the pulse generation circuits of all photovoltaic units respectively emit corresponding pulse signals to the control bus. At the same time, the running load units use power from the power bus, and the pulse generation circuits of the running load units respectively emit corresponding pulse signals to the control bus. S200: The first pulse detection circuit listens to the pulse signals of the frequency bands to which the photovoltaic units and the load units belong on the control bus, compares the total power a corresponding to the pulse signals of the photovoltaic units with the total power b corresponding to the pulse signals of the load units, and if a > b, executes S300, if a < b, executes S400, and if a = b, executes S600. S300: The energy storage unit queries its remaining power s, and if s < c, the energy storage unit charges from the power bus with a power of a-b, and at the same time, emits a pulse signal corresponding to the charging power a-b to the control bus through its own pulse generation circuit, and then executes S600. If s ≥ c, the energy storage unit does not charge and discharge, and its own pulse generation circuit emits a pulse signal corresponding to the back online power a-b to the control bus, and then executes S500. S400: The energy storage unit executes the selection of discharging and / or mains power supplement. If only discharging, the subsequent execution is S600, otherwise the subsequent execution is S500, as shown in Figure 3 S400 includes: S410: The energy storage unit queries its remaining power s, and if s > d, executes S420, and if s ≤ d, executes S450. S420: Determine whether b-a > e, if yes, execute S430, if no, execute S440. S430: the energy storage unit discharges to the power bus with power e, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to the power b-a-e to the control bus as the power supplement of the commercial power, and then S500 is executed; S440: the energy storage unit discharges to the power bus with power b-a, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to the discharging power b-a to the control bus, and then S600 is executed; S450: the energy storage unit does not perform charging and discharging, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to the power supplement of the commercial power b-a to the control bus, and then S500 is executed; S500: the second pulse detection circuit listens to the pulse signal of the frequency band of the energy storage unit on the control bus; If the pulse signal corresponds to the state that the energy storage unit requests to return to the network with the commercial power interface unit, the power flow direction is set to be from the power bus to the commercial power grid, and the power a-b is used to return to the network, and then S600 is executed; If the pulse signal corresponds to the state that the energy storage unit requests the commercial power supplement to the commercial power interface unit, the power flow direction is set to be from the commercial power grid to the power bus, and the power corresponding to the frequency of the pulse signal is used to supplement the commercial power, and then S600 is executed; If the pulse signal corresponding to the request to return to the network or the request for the commercial power supplement is not listened to, S600 is directly executed; S600: waiting for a preset period z, and returning to S100. The value of z is usually less than 0.5s, so as to realize real-time scheduling.

[0041] The above are only part of the embodiments of the present application, and are not used to limit the present application.

Claims

1. A distributed optical storage and retrieval system, characterized by, The power bus, the control bus, and the following are connected to the power bus: a plurality of photovoltaic units, each comprising a pulse generating circuit connected to the control bus; a plurality of load units, each comprising a pulse generating circuit connected to the control bus; a storage unit comprising a battery pack, the rated output power of the battery pack being e, the storage unit being preconfigured with a charging threshold power c and a discharging threshold power d, the storage unit further comprising a pulse generating circuit and a first pulse detection circuit connected to the control bus; a power grid interface unit further connected to the power grid, the power grid interface unit comprising a second pulse detection circuit connected to the control bus; In operation, the pulse generating circuits of all photovoltaic units, load units, storage units, and power grid interface units output pulse signals to the control bus at mutually non-overlapping frequency ranges, the frequency ranges being the respective frequency bands of the photovoltaic units, load units, storage units, and power grid interface units, respectively, the frequency of the pulse signal being linearly corresponding to the power value.

2. The distributed optical energy storage and soft robotics system of claim 1, wherein, The pulse generating circuit of the photovoltaic unit generates, in operation, a pulse signal whose frequency is positively correlated with the power generated by the photovoltaic unit.

3. The distributed optical energy storage and soft robotics system of claim 1, wherein, The pulse generating circuit of the load unit generates, in operation, a pulse signal whose frequency is positively correlated with the load power of the load unit.

4. The distributed photovoltaic storage direct flexible system according to claim 1, characterized in that: the storage unit is used for charging or discharging; the storage unit is further used for requesting the power grid interface unit to return power to the grid and causing the pulse generating circuit thereof to generate a pulse signal whose frequency is positively correlated with the power returned to the grid; the storage unit is further used for requesting the power grid interface unit to supplement power from the grid and causing the pulse generating circuit thereof to generate a pulse signal whose frequency is positively correlated with the power supplemented from the grid; the frequency ranges of the pulse signals generated by the pulse generating circuit of the storage unit in discharging, charging, requesting to return power to the grid, and requesting to supplement power from the grid are mutually non-overlapping.

5. The distributed optical energy storage and soft robotics system of claim 1, wherein, Each pulse generating circuit comprises a voltage sensor, a current sensor, a four-quadrant multiplier, and a voltage-controlled oscillator, in operation, the voltage sensor is used for collecting the voltage output or input by the unit, the current sensor is used for collecting the current output or input by the unit, the signals of the voltage sensor and the current sensor are input to the four-quadrant multiplier to obtain a power signal, and the power signal is input from the four-quadrant multiplier to the voltage-controlled oscillator to generate a power frequency F.

6. The distributed optical energy storage and soft robotics system of claim 1, wherein, The first pulse detection circuit comprises an analog-to-digital converter, a numerical extraction module, a digital-to-analog converter, an addition frequency mixer, a frequency comparator, and a subtraction frequency mixer, in operation, the analog-to-digital converter converts the pulse signals of the pulse generating circuits of all photovoltaic units and the pulse signals of the pulse generating circuits of all load units into digital signals, the numerical extraction module is used for extracting frequency values according to a preconfigured rule, the frequency values of all photovoltaic unit pulse signals and the frequency values of all load unit pulse signals are obtained, the obtained frequency values are converted into analog signals by the digital-to-analog converter, the extracted frequencies of all photovoltaic unit pulse signals are added, the extracted frequencies of all load unit pulse signals are added, the two added values are compared by the frequency comparator, and the difference between the two sums can be calculated by the subtraction frequency mixer.

7. The distributed optical energy storage and shape morphing system of claim 1, wherein, The second pulse detection circuit includes a frequency-to-voltage converter, a voltage comparator, a commutation module, and a power control module. During operation, the frequency-to-voltage converter receives the pulse signal output by the pulse generation circuit of the energy storage unit, converts it using the frequency-to-voltage converter, compares it with the voltage comparator, changes the direction of power flow through the mains interface unit through the commutation module, and controls the power flow through the power control module.

8. The distributed optical energy storage and soft robotics system of claim 5, wherein, The frequency range of the pulse signal output by the pulse generation circuit can be adjusted by regulating the frequency corresponding to the lowest frequency of the voltage-controlled oscillator and the voltage-to-frequency conversion gain.

9. A distributed light storage and direct flexible power distribution method, characterized in that, The distributed optical-storage-direct-flexible system according to any one of claims 1 to 8 includes the following steps: S100: All photovoltaic units generate electricity to the power bus, and the pulse generation circuit of each photovoltaic unit sends a corresponding pulse signal to the control bus. At the same time, each operating load unit draws power from the power bus, and the pulse generation circuit of each operating load unit sends a corresponding pulse signal to the control bus. S200: The first pulse detection circuit listens to the pulse signals of the photovoltaic unit and the load unit on the control bus, compares the total power generation a corresponding to the pulse signal of the photovoltaic unit with the total load power b corresponding to the pulse signal of the load unit. If a > b, then execute S300; if a < b, then execute S400; if a = b, then execute S600. S300: The energy storage unit queries its remaining power s. If s < c, the energy storage unit charges from the power bus with ab power, and then executes S600. If s ≥ c, the energy storage unit does not charge or discharge, and its own pulse generation circuit sends a pulse signal to the control bus with ab as the power corresponding to the power to return to the grid, and then executes S500. S400: The energy storage unit selects to perform discharge and / or mains power replenishment. If only discharge is performed, then S600 is executed; otherwise, S500 is executed. S500: The second pulse detection circuit monitors the pulse signal of the frequency band to which the energy storage unit on the control bus belongs; If the pulse signal corresponds to the state of the energy storage unit requesting power back to the grid from the mains interface unit, then the direction of power flow is set to be from the power bus to the mains grid, and power back to the grid is performed with power of ab, and then S600 is executed. If the pulse signal corresponds to the state of the energy storage unit requesting mains power replenishment from the mains power interface unit, then the direction of power flow is set from the mains power grid to the power bus, and mains power replenishment is performed with the power corresponding to the frequency of the pulse signal, and then S600 is executed. If no corresponding pulse signal requesting power-back or mains power replenishment is detected, execute S600 directly; S600: Wait for the preset period z, then return to S100.

10. The distributed optical storage and retrieval method of claim 9, wherein, The S400 includes: S410: The energy storage unit queries its remaining power s. If s > d, execute S420; if s ≤ d, execute S450. S420: Determine if ba > e. If yes, execute S430; otherwise, execute S440. S430: the energy storage unit discharges to the power bus with power e, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to the power b-a-e as the power supplement of the commercial power to the control bus, and then S500 is performed; S440: the energy storage unit discharges to the power bus with power b-a, and then S600 is performed; S450: the energy storage unit does not perform charging and discharging, and the pulse generating circuit of the energy storage unit transmits the pulse signal corresponding to the power b-a as the power supplement of the commercial power to the control bus, and then S500 is performed.

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