Active area intelligent terminal station all-in-one machine and adjusting method

Abstract

The invention relates to an active transformer area intelligent terminal station all-in-one machine and an adjusting method, the all-in-one machine comprises a DC bus, a compensation unit and a flexible access unit, the compensation unit and the flexible access unit are connected with the DC bus, and the compensation unit comprises a voltage compensation unit and a current compensation unit; the direct current bus is used for connecting the voltage compensation unit and the current compensation unit; the voltage compensation unit is connected between a power supply and a load; the current compensation unit is connected in parallel with the load; the flexible access unit comprises an energy storage system, a direct current charging system and a photovoltaic power generation system which are connected in parallel; the energy storage system is composed of a lithium ion battery and a first DC / DC converter and is used for providing energy; the direct-current charging system is composed of a direct-current charging pile and a second DC / DC converter and used for absorbing electric energy from the direct-current bus to charge the electric vehicle; and the photovoltaic power generation system is composed of a photovoltaic array and a third DC / DC converter and is used for supplying power to the lithium ion battery energy storage system, the direct current charging system and the direct current bus.

Description

Technical Field

[0001] The invention relates to an active station area intelligent terminal station integrated machine and an adjustment method, belonging to the technical field of active station area flexible power supply and power electronics. Background Art

[0002] In the context of the urgent need to develop a new power system, traditional units cannot provide sufficient flexibility to the system. With the large-scale access of distributed clean energy generation to the distribution network, the flexible resources such as electric vehicles, distributed energy storage, distributed wind power and photovoltaics connected to the user side have caused the operation model of the traditional power system to begin to change. The original large number of electricity users have begun to transform from consumers to integrated producers and sellers. The flexible resources on the user side can participate in the auxiliary services, peak-valley arbitrage and market-based transactions of the power grid, and the currently widely used active substations are a natural collection of flexible resources with integrated production and sales.

[0003] In order to achieve effective demand-side response with the flexible resources of active substations and improve the configuration efficiency of the new power system, it is necessary to organically aggregate and coordinate the flexible resources of substations. On this basis, aggregating more active substations and independent distributed power sources can form a virtual power plant operation mode under the management of aggregators, and actively participate in the optimization operation of the distribution network to a greater extent and on a larger scale.

[0004] At present, various control devices widely used in active substations, such as static VAR compensator SVC, static synchronous VAR generator STATCOM, active power filter APF and unified power quality conditioner UPQC, can to a certain extent solve the intermittent and uncertainty of distributed power sources such as solar energy and wind energy installed in the substation, causing voltage fluctuations and harmonic problems, which in turn interfere with the normal operation of user equipment and reduce the power quality and stability of system operation. They not only improve the power quality of the distribution network, but also promote the further development of user power technology.

[0005] However, it should also be noted that these regulators are relatively simple in function, and it is difficult to fully respond to complex and changeable power quality issues and achieve comprehensive compensation. At the same time, they also lack the ability to aggregate and manage a large number of scattered, disordered, small, and difficult-to-control controllable resources in active substations. Summary of the invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention proposes an active substation intelligent terminal station integrated machine and adjustment method, which has local service functions for the substation downward and distribution network service functions for the power grid upward. As a guaranteed service, the integrated machine can also realize the comprehensive management of the power quality of the substation. The local service functions of the integrated machine include: substation status identification, network fault scanning, equipment monitoring and protection, energy saving and loss reduction, flexible resource mutual assistance and coordinated operation, etc.; the distribution network service functions include: real-time uploading of active substation status information, providing status data for the main station to realize the overall flow optimization control of the distribution network; as a micro virtual power plant, accepting distribution network dispatching, realizing the optimized operation of the substation access point or area; guaranteed service: realizing the function of comprehensive quality of substation voltage deviation, harmonics, power factor, three-phase imbalance, and voltage temporary rise and fall.

[0007] The technical solution of the present invention is as follows:

[0008] In the first aspect, the present invention provides an active area intelligent terminal station device, including a DC bus and a compensation unit and a flexible access unit connected thereto; the compensation unit includes a voltage compensation unit and a current compensation unit; the DC bus is used to connect the voltage compensation unit and the current compensation unit; the voltage compensation unit is connected between the power supply and the load, and is used to compensate the load voltage, and the DC bus provides compensation energy for the voltage compensation unit; the current compensation unit is connected in parallel with the load, and is used to compensate for the harmonics, three-phase imbalance and reactive current of the load, and at the same time provides voltage support for the DC bus and provides energy for the voltage compensation unit; the flexible access unit includes an energy storage system, a DC charging system and a photovoltaic power generation system connected in parallel; the energy storage The system is composed of a lithium-ion battery and a first DC / DC converter, and is used to store energy when the load consumes less power and provide energy when the load consumes more power; the DC charging system is composed of a DC charging pile and a second DC / DC converter, and is used to draw power from the DC bus to charge the electric vehicle; the photovoltaic power generation system, which is composed of a photovoltaic array and a third DC / DC converter, is used to supply power to the lithium-ion battery energy storage system, the DC charging system and the DC bus; the first DC / DC converter, the DC / DC converter 2 and the third DC / DC converter are respectively used to convert the power absorbed or transmitted by the lithium-ion battery energy storage system, the DC charging pile and the photovoltaic power generation system to the DC bus.

[0009] As a preferred solution, the first DC / DC converter, the second DC / DC converter and the third DC / DC converter have the same structure, and all include a low-voltage source full-bridge unit, a high-voltage source full-bridge unit and a transformer unit; the low-voltage source full-bridge unit is arranged on a side close to the energy storage system, the DC charging system and the photovoltaic array; the high-voltage source full-bridge unit is arranged on a side close to the DC bus;

[0010] The voltage transformation unit is used to transform the voltage between the low-voltage source full-bridge unit and the high-voltage source full-bridge unit, and complete the transmission of power P from the low-voltage source full-bridge unit to the high-voltage source full-bridge unit.

[0011] In the second aspect, the present invention provides an active substation intelligent terminal station integrated machine adjustment method, which is implemented based on an active substation intelligent terminal station integrated machine described in the first aspect, and includes the steps of: S1, obtaining the active substation intelligent terminal station integrated machine; S2, obtaining a preset control strategy, and controlling the active substation intelligent terminal station integrated machine based on the control strategy to achieve four-quadrant power flow control on the grid side, access to flexible resources (lithium-ion battery energy storage system, DC charging system, photovoltaic power generation system) in the substation, and comprehensive power quality management between the grid and the substation.

[0012] As a preferred solution, the step S1 of obtaining the active substation intelligent terminal station integrated machine includes the steps of: connecting the voltage compensator to the grid through a coupled three-phase injection transformer between the DC bus and the grid; connecting the current compensator to the grid through a coupled three-phase injection transformer between the DC bus and the load; and connecting a lithium-ion battery energy storage system, a DC charging system and a photovoltaic power generation system in parallel on the DC bus.

[0013] As a preferred solution, the control strategy includes a voltage compensation unit control strategy; based on the voltage compensation unit control strategy, the integrated active substation intelligent terminal station is controlled to adjust the power quality of the power grid and the load, including the steps of: obtaining the system power grid voltage, the load voltage and the system reference voltage; performing difference calculation based on the system power grid voltage and the load voltage to obtain the voltage difference; performing park transformation on the voltage difference to obtain the d-axis voltage component and the q-axis voltage component; based on the d-axis voltage component, the q-axis voltage component and the system reference voltage, the regulation is accelerated through PI proportional integral control, and then the a, b, c three-phase voltages are obtained through park inverse transformation to generate a sinusoidal pulse width modulation control signal to drive the voltage compensation unit, thereby completing the power quality regulation of the power grid and providing high-quality power supply voltage for the load.

[0014] As a preferred solution, the control strategy includes a current compensation unit control strategy; based on the current compensation subunit control strategy, the active substation intelligent terminal station integrated machine is controlled to achieve two functions; the first is to adjust the load power quality, including the steps of: obtaining the three-phase current of the system power grid; calculating the d-axis current component and the q-axis current component through the parallel side compensation detection unit; decoupling the d-axis current component and the q-axis current component, and performing park inverse transformation to obtain a voltage command signal and generate a sinusoidal pulse width modulation control signal to drive the current compensation unit, thereby completing the load power quality regulation and eliminating the impact of load harmonics, three-phase imbalance and reactive current on the power grid; the second is to calculate the controllable resources that can participate in the scheduling in the substation based on the source-load output curve in the substation, and wait for the time-sharing call command of the power grid control master station. If the call command is issued, the quantized power range that the substation can accept scheduling is uploaded to the power grid control master station. After obtaining the optimization scheduling command and issuing it, the power grid control master station controls the current compensation subunit to send a power flow controllable in the four quadrants to the grid side to participate in supporting the optimized operation of the power grid.

[0015] As a preferred solution, the control strategy includes a DC bus voltage stabilization control strategy for a photovoltaic power generation system; based on the DC bus voltage stabilization control strategy, the active substation intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and the load, including the steps of: obtaining the maximum power point of the photovoltaic power generation system; based on the maximum power point, presetting the corresponding output voltage; based on the output voltage, controlling the photovoltaic power generation system to control the DC bus voltage, and charging the lithium-ion battery energy storage system when necessary, or supplying power to the DC charging system, thereby completing circuit power quality regulation.

[0016] As a preferred solution, the control strategy includes a DC bus voltage stabilization control strategy for a lithium-ion battery energy storage system; based on the DC bus voltage stabilization control strategy, the active substation intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and the load, including the steps of: when the photovoltaic power generation system has insufficient output or stops working at night, the corresponding output voltage is preset, and the lithium-ion battery energy storage system is controlled based on the preset voltage to control the DC bus voltage, thereby completing the circuit power quality regulation and the DC energy supply required by the DC charging system.

[0017] On the other hand, the present invention also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the active area intelligent terminal station integrated machine adjustment method as described in any embodiment of the present invention is implemented.

[0018] On the other hand, the present invention further proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the active area intelligent terminal station integrated machine adjustment method as described in any embodiment of the present invention.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The voltage and current compensation units work together to effectively suppress the frequent disturbances of current or voltage caused by the open integrated DC bus and the large number of flexible resources connected to the substation, making the DC side bus voltage stable and easy to control.

[0021] 2. By opening the DC bus, the lithium-ion battery energy storage system, DC charging system and photovoltaic power generation system can be connected to control the bidirectional flow of power in the DC bus, thereby completing the function of DC bus voltage control, so that the DC side voltage is not disturbed by the access of flexible resources in the substation area and remains stable.

[0022] Additional aspects and advantages of the present invention will be set forth in the following description, and some of them will be apparent from the description, or may be understood by practicing the present invention. In addition, the various aspects and advantages of the present invention may be realized and obtained by the method steps and combinations particularly pointed out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the topological structure of the active area intelligent terminal station integrated machine described in the first embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the topological structure of the DC / DC converter according to the first embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the grid voltage control strategy described in the second embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0028] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0030] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0031] In order to facilitate a better understanding of the embodiments of the present invention, before explaining the specific implementation modes of the present invention in detail, its application scenarios are first described.

[0032] The active substation intelligent terminal station integrated machine described in the embodiments of this specification is applied to a variety of power transmission and distribution processes. In these scenarios, the application of the active substation intelligent terminal station integrated machine is intended to achieve multi-objective benefits for both the power grid and the substation. First, the power grid uses the controllable resources of the substation to achieve optimized flow operation; second, the voltage and current fluctuations in the substation are effectively controlled, thereby significantly improving the power quality and reducing equipment failures and downtime caused by power quality problems, so as to provide high-quality user experience and reliable performance; third, the lithium-ion battery energy storage system, DC charging system and photovoltaic power generation system are organically linked together through the active substation intelligent terminal station integrated machine, supporting the coordinated operation of flexible and controllable resources in the substation, improving the new energy absorption rate and reducing losses.

[0033] Embodiment 1:

[0034] like Figure 1As shown, this embodiment provides an active substation intelligent terminal station all-in-one machine, which has local service functions for the substation downward and distribution network service functions for the power grid upward. As a bottom-line service, the all-in-one machine can also realize comprehensive management of power quality in the substation. The local service functions of the all-in-one machine include: substation status identification, network fault scanning, equipment monitoring and protection, energy saving and loss reduction, flexible resource mutual assistance and coordinated operation, etc.; the distribution network service functions include: real-time uploading of active substation status information, and providing status data for the main station to realize the overall power flow optimization control of the distribution network; as a micro virtual power plant, it accepts distribution network dispatch to realize the optimized operation of substation access points or areas; guaranteed service: realize the function of comprehensive quality of substation voltage deviation, harmonics, power factor, three-phase imbalance, and voltage temporary rise and fall; including a DC bus and a compensation unit and an adjustment unit connected thereto; the compensation unit includes a voltage compensation unit and a current compensation unit; the DC bus is used to connect the voltage compensation unit and the current compensation subunit; the voltage compensation unit is connected between the power supply and the load to compensate for the load voltage, and the DC bus provides compensation energy for the voltage compensation unit; the current compensation subunit is connected in parallel with the load to compensate for the harmonics and three-phase imbalance of the load and reactive current, while providing voltage support for the DC bus and energy for the voltage compensation unit; the regulating unit includes a lithium-ion battery energy storage system, a DC charging system and a photovoltaic power generation system connected in parallel; the lithium-ion battery energy storage system is composed of a lithium-ion battery and a first DC / DC converter, and is used to store energy when the load consumes less power and provide energy when the load consumes more power; the DC charging system is composed of a DC charging pile and a second DC / DC converter, and is used to charge electric vehicles; the photovoltaic power generation system, which is composed of a photovoltaic array and a third DC / DC converter, is used to supply power to the lithium-ion battery energy storage system, the DC charging system and the DC bus; the first DC / DC converter, the second DC / DC converter and the third DC / DC converter are respectively used to convert the power transmitted or absorbed by the lithium-ion battery energy storage system, the DC charging system and the photovoltaic power generation system to the DC bus.

[0035] Due to the low terminal voltage of lithium-ion battery packs, it is not possible to directly connect lithium-ion battery cells to the DC bus. Figure 2 The symmetrical full-bridge bidirectional DC / DC converter shown can keep the output voltage of the lithium-ion battery energy storage system stable and realize bidirectional flow of DC power; the photovoltaic power generation system and the lithium-ion battery energy storage system are connected in parallel to the DC bus, and the photovoltaic power generation system is controlled to work in the maximum power point tracking (MPPT) state, so as to make full use of the power generation capacity of the photovoltaic system, and the charging and discharging control of the lithium-ion battery energy storage system maintains a stable voltage of the DC bus.

[0036] More specifically, in this embodiment, the grid-side power supply is set to three-phase AC 380V. The main reason why the power supply in this embodiment is not set to a higher voltage level is because the purpose of the active substation intelligent terminal station is to flexibly connect the grid and the active substation load, and each substation is equipped with a 10kV / 380V distribution transformer.

[0037] Specifically, this embodiment provides a preferred implementation manner, wherein the DC / DC converter includes a low-voltage source full-bridge unit, a high-voltage source full-bridge unit and a transformer unit; the low-voltage source full-bridge unit is arranged on a side close to the lithium-ion battery, the DC charging pile and the photovoltaic array; the high-voltage source full-bridge unit is arranged on a side close to the DC bus.

[0038] The active area intelligent terminal station integrated machine provided in this embodiment has five distinct features through flexible management and control of the active area flexibility resources:

[0039] Feature 1: Multi-time and space characteristics. The source-load-storage side has different characteristic changes at different time scales, and the response capability of the substation resources is strongly correlated with time. According to the time scale, it has the characteristics of ramping, amplitude modulation, frequency modulation, and peak regulation; for the spatial scale, since the substation resources are mostly small-capacity and dispersed, affected by transmission conditions, they can be aggregated with the help of an integrated machine and interact with the power grid.

[0040] Feature 2: Cluster independence. Flexible resources in the substation area have the characteristics of small capacity, different parameters, and multiple points and wide areas. It is difficult to directly participate in the operation of the power system. Each cluster operates independently and lacks effective aggregation and regulation means. The integrated machine can effectively aggregate a large number of small-capacity, large-variance, and multi-mode source-load-storage resources in the substation area, presenting cluster independence regulation.

[0041] Feature 3: Bidirectional conversion. The demand and supply of substation resources can be converted into each other. The flexibility demand on the user side can be converted into flexibility supply through user-side response, and the flexibility supply also provides certain flexible regulation resources for the distribution network. The all-in-one machine has become the core hub of the bidirectional conversion of active substations, effectively connecting the interactive operation of aggregated users and the power grid.

[0042] Feature 4: Random characteristics. Substation resources are uncertain and volatile, and an all-in-one machine is needed to accurately estimate the real-time status of various resources' flexibility adjustment capabilities and conduct timely supervision.

[0043] Feature 5: Directionality. Under the control of the integrated machine, the active substation acts as a micro virtual power plant and has two power adjustment modes, upward and downward. Therefore, the regulation of substation resources under the supervision of the integrated machine has directionality.

[0044] The active substation intelligent terminal station has local service functions downward and distribution network service functions upward.

[0045] Local service functions include: substation status identification, network fault scanning, equipment monitoring and protection, comprehensive power quality management, energy saving and loss reduction, flexible resource mutual assistance and coordinated operation, etc.

[0046] The distribution network service functions include: real-time uploading of active substation status information, providing status data for the main station to achieve global power flow optimization control of the distribution network; accepting distribution network dispatch as a micro virtual power plant to achieve optimized operation of substation access points or regions.

[0047] Embodiment 2:

[0048] This embodiment provides an active substation intelligent terminal station integrated machine control strategy, based on an active substation intelligent terminal station integrated machine described in Example 1, including the steps of: S1, obtaining the active substation intelligent terminal station integrated machine; S2, obtaining a preset control strategy, and controlling the active substation intelligent terminal station integrated machine based on the control strategy to achieve four-quadrant power flow control on the grid side, access to flexible resources (lithium-ion battery energy storage system, DC charging system, photovoltaic power generation system) in the substation, and comprehensive power quality management between the grid and the substation.

[0049] Specifically, this embodiment provides a preferred implementation of step S1, including the steps of: connecting the voltage compensator to the grid through a coupled three-phase injection transformer between the DC bus and the grid; connecting the current compensator to the grid through a coupled three-phase injection transformer between the DC bus and the load; and connecting a lithium-ion battery energy storage system, a DC charging system, and a photovoltaic power generation system in parallel on the DC bus.

[0050] Specifically, this embodiment provides a preferred implementation method, wherein the control strategy includes a voltage compensation unit control strategy; based on the voltage compensation unit control strategy, the integrated active substation intelligent terminal station is controlled to adjust the power quality of the power grid and the load, including the steps of: obtaining the system power grid voltage, the load voltage and the system reference voltage; performing difference calculation based on the system power grid voltage and the load voltage to obtain the voltage difference; performing park transformation on the voltage difference to obtain the d-axis voltage component and the q-axis voltage component; based on the d-axis voltage component, the q-axis voltage component and the system reference voltage, the regulation is accelerated through PI proportional integral control, and then the a, b, c three-phase voltages are obtained through park inverse transformation to generate a sinusoidal pulse width modulation control signal to drive the series sub-units, thereby completing the power quality regulation of the power grid and providing high-quality power supply voltage for the load.

[0051] Specifically, this embodiment provides a preferred implementation, the control strategy includes a current compensation unit control strategy; based on the current compensation subunit control strategy, the active substation intelligent terminal station integrated machine is controlled to achieve two functions; the first is to adjust the load power quality, including the steps of: obtaining the three-phase current of the system power grid; calculating the d-axis current component and the q-axis current component through the parallel side compensation detection unit; decoupling the d-axis current component and the q-axis current component, and performing park inverse transformation to obtain a voltage command signal and generate a sinusoidal pulse width modulation control signal to drive the current compensation unit, thereby completing the load power quality regulation and eliminating the impact of load harmonics, three-phase imbalance and reactive current on the power grid; the second is to calculate the controllable resources that can participate in the scheduling in the substation based on the source-load output curve in the substation, and wait for the time-sharing call command of the power grid control master station. If the call command is issued, the quantized power range that the substation can accept scheduling is uploaded to the power grid control master station. After obtaining the optimization scheduling command and issuing it, the power grid control master station controls the current compensation subunit to send a power flow controllable in the four quadrants to the grid side to participate in supporting the optimized operation of the power grid.

[0052] Specifically, this embodiment provides a preferred implementation method, wherein the control strategy includes a DC bus voltage stabilization control strategy for a photovoltaic power generation system; based on the DC bus voltage stabilization control strategy, the active substation intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and the load, including the steps of: obtaining the maximum power point of the photovoltaic power generation system; based on the maximum power point, presetting the corresponding output voltage; based on the output voltage, controlling the photovoltaic power generation system to control the DC bus voltage, and charging the lithium-ion battery energy storage system when necessary, or supplying power to the DC charging system, thereby completing circuit power quality regulation.

[0053] Specifically, this embodiment provides a preferred implementation method, wherein the control strategy includes a DC bus voltage stabilization control strategy for a lithium-ion battery energy storage system; based on the DC bus voltage stabilization control strategy, the active substation intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and the load, including the steps of: when the photovoltaic power generation system has insufficient output or stops working at night, a corresponding output voltage is preset, and the lithium-ion battery energy storage system is controlled based on the preset voltage to control the DC bus voltage, thereby completing the circuit power quality regulation and the DC energy supply required by the DC charging system.

[0054] Embodiment three:

[0055] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in any embodiment of the present invention when executing the program.

[0056] Embodiment 4:

[0057] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in any embodiment of the present invention is implemented.

[0058] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0059] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0060] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0061] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0062] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An active area intelligent terminal station integrated machine, including a DC bus and a compensation unit and a flexible access unit connected thereto, characterized in that: The compensation unit includes a voltage compensation unit and a current compensation unit; the DC bus is used to connect the voltage compensation unit and the current compensation unit; the voltage compensation unit is connected between the power supply and the load to compensate for the load voltage, and the DC bus provides compensation energy for the voltage compensation unit; the current compensation unit is connected in parallel with the load to compensate for the harmonics, three-phase imbalance and reactive current of the load, and at the same time provide voltage support for the DC bus and provide energy for the voltage compensation unit; the flexible access unit includes an energy storage system, a DC charging system and a photovoltaic power generation system connected in parallel; the energy storage system is composed of a lithium-ion battery and a first DC / DC converter, used to provide energy; the DC charging system, composed of a DC charging pile and a second DC / DC converter, is used to draw electrical energy from the DC bus to charge the electric vehicle; the photovoltaic power generation system, composed of a photovoltaic array and a third DC / DC converter, is used to supply power to the lithium-ion battery energy storage system, the DC charging system and the DC bus; the first DC / DC converter, the second DC / DC converter and the third DC / DC converter are respectively used to convert the power absorbed or transmitted to the DC bus by the lithium-ion battery energy storage system, the DC charging pile and the photovoltaic power generation system.

2. The active area intelligent terminal station integrated machine according to claim 1, characterized in that: The first DC / DC converter, the second DC / DC converter and the third DC / DC converter have the same structure, and all include a low-voltage source full-bridge unit, a high-voltage source full-bridge unit and a transformer unit; the low-voltage source full-bridge unit is arranged on a side close to the energy storage system, the DC charging system and the photovoltaic array; the high-voltage source full-bridge unit is arranged on a side close to the DC bus; The voltage transformation unit is used to transform the voltage between the low-voltage source full-bridge unit and the high-voltage source full-bridge unit, and complete the transmission of power P from the low-voltage source full-bridge unit to the high-voltage source full-bridge unit.

3. A method for adjusting an active area intelligent terminal station integrated machine, based on an active area intelligent terminal station integrated machine as claimed in any one of claims 1 to 2, comprising the steps of: S1, obtaining the active area intelligent terminal station integrated machine; S2. Obtain a preset control strategy, and control the active substation intelligent terminal station integrated machine based on the control strategy to achieve four-quadrant power flow control on the grid side, access to flexible resources in the substation, and comprehensive power quality management between the grid and the substation; in, Flexible resources within the station area include lithium-ion battery energy storage systems, DC charging systems, and photovoltaic power generation systems.

4. The active area intelligent terminal station integrated machine adjustment method according to claim 3 is characterized in that: The step of obtaining the active area intelligent terminal station integrated machine comprises the following steps: The voltage compensator is connected to the grid through a coupled three-phase injection transformer between the DC bus and the grid; the current compensator is connected to the grid through a coupled three-phase injection transformer between the DC bus and the load; and a lithium-ion battery energy storage system, a DC charging system and a photovoltaic power generation system are connected in parallel on the DC bus.

5. The active area intelligent terminal station integrated machine adjustment method according to claim 3 is characterized in that: The control strategy includes a voltage compensation unit control strategy; Based on the voltage compensation unit control strategy, the integrated active area intelligent terminal station is controlled to adjust the power quality of the power grid and the load, including the steps of: Obtain system grid voltage, load voltage and system reference voltage; The voltage difference is obtained by performing a difference calculation based on the system grid voltage and the load voltage; the voltage difference is park transformed to obtain a d-axis voltage component and a q-axis voltage component; based on the d-axis voltage component, the q-axis voltage component and the system reference voltage, the a, b, and c three-phase voltages are obtained by accelerating the adjustment through PI proportional integral control and then through park inverse transformation to generate a sinusoidal pulse width modulation control signal to drive the voltage compensation unit.

6. The active area intelligent terminal station integrated machine adjustment method according to claim 3 is characterized in that: The control strategy includes a current compensation unit control strategy; Based on the current compensation subunit control strategy, the active area intelligent terminal station integrated machine is controlled to achieve two functions; The first is to adjust the load power quality, including the following steps: Obtain the three-phase current of the system power grid; calculate the d-axis current component and the q-axis current component through the parallel side compensation detection unit; Decoupling the d-axis current component and the q-axis current component, performing inverse park transformation to obtain a voltage command signal and generate a sinusoidal pulse width modulation control signal to drive a current compensation unit, thereby completing load power quality regulation; The second is to calculate the controllable resources that can participate in scheduling in the substation based on the source-load output curve in the substation, and wait for the time-sharing call for measurement instructions from the power grid control master station. If the call for measurement instructions are issued, the quantified power range that the substation can accept for scheduling is uploaded to the power grid control master station. After obtaining and issuing the optimized scheduling instructions, the power grid control master station controls the current compensation subunit to send a power flow controllable in the four quadrants to the grid side.

7. The active area intelligent terminal station integrated machine adjustment method according to claim 3 is characterized in that: The control strategy includes a DC bus voltage stabilization control strategy for a photovoltaic power generation system; based on the DC bus voltage stabilization control strategy, the active area intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and loads, including the steps of: Obtaining the maximum power point of the photovoltaic power generation system; based on the maximum power point, presetting a corresponding output voltage; controlling the photovoltaic power generation system based on the output voltage to control the DC bus voltage, and charging the lithium-ion battery energy storage system or supplying power to the DC charging system when necessary.

8. The active area intelligent terminal station integrated machine adjustment method according to claim 3 is characterized in that: The control strategy includes a DC bus voltage stabilization control strategy for a lithium-ion battery energy storage system; based on the DC bus voltage stabilization control strategy, the active area intelligent terminal station integrated machine is controlled to adjust the power quality of the power grid and loads, including the steps of: When the photovoltaic power generation system has insufficient output or stops working at night, the corresponding output voltage is preset, and the lithium-ion battery energy storage system is controlled based on the preset voltage to control the DC bus voltage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the active area intelligent terminal station integrated machine adjustment method as described in any one of claims 3 to 8 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it implements the active area intelligent terminal station integrated machine adjustment method as described in any one of claims 3 to 8.

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