A three-dimensional multi-port synchronous machine characteristic shaping collection station and its control method

Abstract

This invention relates to a three-dimensional multi-port synchronous machine characteristic shaping aggregation station and its control method, comprising: multiple DC ports for connecting to DC systems of different voltage levels; multiple power frequency AC ports for connecting to power frequency AC systems of different voltage levels; multiple low-frequency AC ports for connecting to low-frequency AC systems of different voltage levels; a power conversion unit for controlling the transmission power and input / output DC voltage levels of the multiple DC ports, and for performing power conversion between power frequency AC and low-frequency AC modes and controlling their transmission power; and a coordination control output unit for coordinating the control of the multiple power frequency AC ports and the multiple low-frequency AC ports, and for shaping the synchronous machine characteristics of the multiple power frequency AC ports and the multiple low-frequency AC ports. This invention realizes an energy aggregation hub for the aggregation, access, and consumption of new energy sources of different scales and types.

Description

Technical Field

[0001] This invention belongs to the field of power system transmission and distribution technology, specifically relating to a three-dimensional multi-port synchronous machine characteristic shaping collection station and its control method. Background Technology

[0002] Currently, new energy development is gradually expanding from resources closer to the power grid to more distant locations. New energy sources far from the main grid are characterized by multi-point distribution and large-scale installed capacity: the collection radius can reach tens to hundreds of kilometers, the single-point transmission scale can reach hundreds of MW or even GW levels, and the collection and transmission lines can be of various forms such as DC, power frequency AC, and low-frequency AC. The intermittent and fluctuating power output of new energy sources exhibits spatiotemporal misalignment and complementarity between power stations. The increasing proportion of new energy absorbed by the AC grid is altering the original operating boundaries. It is necessary to explore new methods for new energy collection, networking, and grid-friendly integration to achieve large-scale collection, development, and utilization of multiple points and types of new energy sources. Existing research on system architecture solutions for large-scale collection and networking of multi-point distributed new energy sources mainly follows three technical routes:

[0003] Technical Route 1: The industrial frequency AC aggregation solution involves power generation plants amplifying and transmitting voltage via industrial frequency AC lines. This voltage is then transmitted externally or locally to the nearby industrial frequency AC grid via industrial frequency AC lines of varying voltage levels. The aggregation and transmission system is equipped with reactive power compensation devices to enhance the transmission capacity of the AC lines. This solution is suitable for power generation plants located close to the main grid and with strong grid connection capabilities. However, as the scale and proportion of new energy sources increase, the AC grid's support capacity will gradually decline, voltage issues at the end-point power plants will become more prominent, the marginal cost of increasing transmission capacity will rise, and the risk of power oscillation will increase. The traditional, single-mode industrial frequency AC aggregation and transmission method will struggle to meet the technical demands of future development.

[0004] Technical Route Two: DC Aggregation Solution. After renewable energy power plants are connected to the main grid via AC lines, the power is boosted by DC / DC converters for long-distance, large-scale transmission to distant AC grids, or connected locally to nearby AC grids for consumption via DC / AC conversion. This DC aggregation solution is suitable for scenarios where renewable energy power plants are far from the main grid, have large single aggregation node capacity, and require high channel capacity. However, DC aggregation systems have high costs in handling issues such as voltage level transformation, DC fault isolation and ride-through, multi-station power sharing, and power surplus. They also have low compatibility with smaller-scale power plant aggregation and do not allow for flexible system expansion.

[0005] Technical Route 3: Low-Frequency AC Aggregation Scheme. After renewable energy power plants are aggregated into a network via low-frequency AC transmission lines, the power is transmitted externally through low-frequency AC lines of different voltage levels, or locally connected to the nearby AC grid after frequency conversion. This low-frequency AC aggregation scheme is a novel transmission technology that uses power electronic frequency conversion technology to reduce 50Hz power frequency AC to low-frequency AC. It is a beneficial supplement to power frequency transmission and DC transmission methods, suitable for scenarios with large aggregation radii and high channel capacity requirements. Low-frequency power aggregation systems are currently in the early stages of engineering technology development. Their technical and economic advantages are highest when renewable energy power plants also generate electricity at low frequencies. However, their scalability for connecting multi-point distributed renewable energy sources is relatively low. Summary of the Invention

[0006] To overcome the problems existing in the above-mentioned related technologies, this application provides a method, apparatus, equipment and readable storage medium for diagnosing power distribution network faults.

[0007] According to a first aspect of the embodiments of this application, a three-dimensional multi-port synchronous machine characteristic shaping aggregation station is provided, including: multiple DC ports, multiple power frequency AC ports, multiple low frequency AC ports, a power conversion unit, and a coordination control output unit;

[0008] The power conversion unit is connected to the plurality of DC ports and the plurality of low-frequency AC ports respectively; the coordination control output unit is connected to the power conversion unit, the plurality of low-frequency AC ports and the plurality of power frequency AC ports respectively.

[0009] The multiple DC ports are used to connect to DC systems of different voltage levels;

[0010] The multiple power frequency AC ports are used to connect to power frequency AC systems of different voltage levels;

[0011] The multiple low-frequency AC ports are used to connect to low-frequency AC systems of different voltage levels;

[0012] The power conversion unit is used to control the transmission power and input / output DC voltage levels of the multiple DC ports, and to perform power conversion between power frequency AC and low frequency AC and control its transmission power, as well as to perform power conversion between DC and power frequency AC and control its transmission power.

[0013] The coordination control output unit is used to coordinate the control of the plurality of power frequency AC ports and the plurality of low frequency AC ports, and to shape the synchronous characteristics of the plurality of power frequency AC ports and the plurality of low frequency AC ports.

[0014] Preferably, the plurality of DC ports include: a plurality of medium / high voltage DC collection ports, a plurality of medium / high voltage DC energy storage / discharge ports, and a high voltage DC transmission port.

[0015] Preferably, the plurality of power frequency AC ports include: a plurality of power frequency AC aggregation ports, a plurality of power frequency AC energy storage / discharge ports, and a plurality of power frequency AC transmission ports.

[0016] Preferably, the low-frequency AC port includes: a plurality of low-frequency AC aggregation ports.

[0017] Preferably, the plurality of medium / high voltage DC collection ports, the plurality of low frequency AC collection ports, and the plurality of power frequency AC collection ports constitute an energy collection side port;

[0018] The plurality of medium / high voltage DC energy storage / discharge ports constitute the DC energy storage / discharge side ports;

[0019] The plurality of power frequency AC energy storage / discharge ports constitute the AC energy storage / discharge side ports;

[0020] The high-voltage DC transmission port and the multiple power frequency AC transmission ports constitute the transmission side.

[0021] Preferably, the power conversion unit comprises: a high-voltage multi-port DC / DC converter, a DC / AC converter, and an AC / AC converter.

[0022] Each DC side of the high-voltage multi-port DC / DC converter is connected to the plurality of medium / high voltage DC collection ports, the plurality of medium / high voltage DC energy storage / discharge ports, and the high-voltage DC transmission port, respectively.

[0023] The DC side of the DC / AC converter unit is connected to one DC side of the high-voltage multi-port DC / DC converter unit, and the AC side is connected to the power frequency AC bus.

[0024] The low-frequency AC side of the AC / AC converter unit is connected to the plurality of low-frequency AC collection ports, and the power frequency AC side is connected to the power frequency AC bus.

[0025] The coordination control output unit is connected to the power frequency AC bus;

[0026] The plurality of power frequency AC aggregation ports, the plurality of power frequency AC energy storage / discharge ports, and the plurality of power frequency AC transmission ports are all connected to the power frequency AC bus.

[0027] Preferably, the high-voltage multi-port DC / DC converter is used to control the transmission power and input / output DC voltage levels of the plurality of medium / high voltage DC collection ports, the plurality of medium / high voltage DC energy storage / discharge ports and the high-voltage DC transmission port;

[0028] The DC / AC converter unit is used to perform power conversion between DC and AC modes and control its transmission power.

[0029] The AC / AC converter unit is used to convert power between power frequency AC and low frequency AC and to control its transmission power.

[0030] Preferably, the coordinated control output unit comprises:

[0031] The power frequency AC port control output module is used to allocate the output power of the multiple power frequency AC ports and to shape the synchronous characteristics of the multiple power frequency AC ports.

[0032] The low-frequency AC port control output module is used to allocate the output power of the multiple low-frequency AC ports and to shape the low-frequency AC synchronous characteristics of the multiple low-frequency AC ports.

[0033] Preferably, the power frequency AC aggregation port is connected to the power frequency new energy power station via a power frequency AC line;

[0034] The low-frequency AC collection port is connected to the low-frequency AC new energy power station via a low-frequency AC line.

[0035] The medium / high voltage DC collection port is connected to the DC new energy power station via a DC line;

[0036] The medium / high voltage DC energy storage / discharge port is connected to the DC energy storage / discharge device;

[0037] The high-voltage DC transmission port is connected to the remote load center via a high-voltage DC transmission line;

[0038] The power frequency AC transmission port is connected to the power frequency AC power grid of each voltage level;

[0039] The power frequency AC energy storage / discharge port is connected to the power frequency AC energy storage / discharge device and / or power frequency AC energy storage / discharge system via a power frequency AC line.

[0040] According to a second aspect of the embodiments of this application, a control method for a three-dimensional multi-port synchronizer characteristic shaping aggregation station is provided, comprising:

[0041] It utilizes multiple DC ports to connect DC systems of different voltage levels;

[0042] Multiple power frequency AC ports are used to connect power frequency AC systems of different voltage levels;

[0043] Multiple low-frequency AC ports are used to connect to low-frequency AC systems of different voltage levels;

[0044] The power conversion unit controls the transmission power and input / output DC voltage levels of the multiple DC ports, performs power conversion between power frequency AC and low frequency AC and controls its transmission power, and performs power conversion between DC and power frequency AC and controls its transmission power.

[0045] The coordinated control output unit is used to coordinate the control of the multiple power frequency AC ports and the multiple low frequency AC ports, and to shape the synchronous characteristics of the multiple power frequency AC ports and the multiple low frequency AC ports.

[0046] Preferably, the method of using a power conversion unit to control the transmission power and input / output DC voltage levels of the multiple DC ports, and to perform power conversion between power frequency AC and low frequency AC and control its transmission power, and to perform power conversion between DC and power frequency AC and control its transmission power, includes:

[0047] The transmission power and input / output DC voltage levels of multiple medium / high voltage DC collection ports, the multiple medium / high voltage DC energy storage / discharge ports, and the high voltage DC transmission port are controlled by a high voltage multi-port DC / DC voltage conversion unit.

[0048] The DC / AC converter unit is used to convert power from DC to AC and control its transmission power.

[0049] The AC / AC converter is used to convert power between power frequency AC and low frequency AC and control its transmission power.

[0050] Preferably, the coordinated control of the plurality of power frequency AC ports and the plurality of low frequency AC ports using the coordinated control output unit, and the shaping of the synchronous characteristics of the plurality of power frequency AC ports and the plurality of low frequency AC ports, includes:

[0051] The output module is used to control the distribution of the output power of the multiple power frequency AC ports and to shape the synchronous characteristics of the multiple power frequency AC ports.

[0052] The output power of the multiple low-frequency AC ports is allocated by the low-frequency AC port control output module, and the low-frequency AC synchronous characteristics of the multiple low-frequency AC ports are shaped.

[0053] According to a third aspect of the present application, an electronic device is provided, comprising: at least one processor and a memory; wherein the memory and the processor are connected via a bus.

[0054] The memory is used to store one or more programs;

[0055] When the one or more programs are executed by the at least one processor, the control method for shaping the three-dimensional multi-port synchronous machine characteristics of the aggregation station is implemented.

[0056] According to a fourth aspect of the embodiments of this application, a readable storage medium is provided, on which an executable program is stored, wherein when the executable program is executed, the control method for the three-dimensional multi-port synchronous machine characteristic shaping aggregation station is implemented.

[0057] The technical solution provided by this invention has the following beneficial effects:

[0058] This invention provides a three-dimensional multi-port synchronous machine characteristic shaping aggregation station and its control method, comprising: multiple DC ports, multiple power frequency AC ports, multiple low frequency AC ports, a power conversion unit, and a coordination control output unit; the power conversion unit is connected to the multiple DC ports and the multiple low frequency AC ports respectively; the coordination control output unit is connected to the power conversion unit, the multiple low frequency AC ports, and the multiple power frequency AC ports respectively; the multiple DC ports are used to connect DC systems of different voltage levels; the multiple power frequency AC ports are used to connect power frequency AC systems of different voltage levels; the multiple low frequency AC ports are used to connect low frequency AC systems of different voltage levels; the power conversion unit is used to control the transmission power and input / output DC voltage levels of the multiple DC ports, and to perform power conversion between power frequency AC and low frequency AC forms and control their transmission power, and to perform power conversion between DC and power frequency AC forms and control their transmission power; the coordination control output unit is used to perform coordinated control of the multiple power frequency AC ports and the multiple low frequency AC ports, and to shape the synchronous machine characteristics of the multiple power frequency AC ports and the multiple low frequency AC ports. This invention provides a three-dimensional multi-port synchronous machine characteristic shaping collection station suitable for heterogeneous access of new energy sources, forming an energy collection hub that can realize the collection and absorption of new energy sources of different scales and types, providing a system architecture solution for the collection, transmission and friendly absorption of new energy sources; it realizes the large-scale collection, development and utilization of multiple points and types of new energy sources, interconnects DC, power frequency AC and low frequency AC new energy collection lines with different transmission capacities and voltage levels, and provides active support for the accessed power frequency / low frequency AC new energy power plants and power frequency AC systems in terms of voltage, frequency and inertia by constructing the characteristics of the whole station synchronous machine, providing an interface for GW-level and above high voltage DC transmission channels, and at the same time smoothing the overall power fluctuation of the new energy collection system. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the topology architecture of a three-dimensional multi-port synchronous machine characteristic shaping aggregation station provided by an embodiment of the present invention;

[0061] Figure 2 This is a schematic diagram of the internal structure of a topology architecture for a three-dimensional multi-port synchronizer-shaped aggregation station, provided by an embodiment of the present invention.

[0062] Figure 3 A schematic diagram of a typical application scenario of a three-dimensional multi-port synchronizer shaping a collection station, provided by an embodiment of the present invention;

[0063] Figure 4 This is a flowchart of a control method for a three-dimensional multi-port synchronous machine characteristic shaping aggregation station provided by an embodiment of the present invention;

[0064] Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of the present invention;

[0065] In the diagram, 1 - multiple DC ports, 2 - multiple power frequency AC ports, 3 - multiple low frequency AC ports, 4 - power conversion unit, 5 - coordinated control output unit, 6 - high voltage multi-port DC / DC voltage conversion unit, 7 - DC to power frequency AC conversion unit, and 8 - power frequency AC to low frequency AC conversion unit. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the following embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0067] Example 1

[0068] This invention provides a three-dimensional multi-port synchronizer characteristic shaping aggregation station, such as... Figure 1 As shown, it includes: multiple DC ports 1, multiple power frequency AC ports 2, multiple low frequency AC ports 3, a power conversion unit 4, and a coordination control output unit 5;

[0069] The power conversion unit 4 is connected to multiple DC ports 1 and multiple low-frequency AC ports 3 respectively; the coordination control output unit 5 is connected to the power conversion unit 4, multiple low-frequency AC ports 3 and multiple power frequency AC ports 2 respectively.

[0070] Multiple DC ports 1 are provided for connecting DC systems of different voltage levels;

[0071] Multiple power frequency AC ports 2 are used to connect power frequency AC systems of different voltage levels;

[0072] Multiple low-frequency AC ports 3 are used to connect to low-frequency AC systems of different voltage levels;

[0073] The power conversion unit 4 is used to control the transmission power and input / output DC voltage levels of multiple DC ports 1, as well as to perform power conversion between power frequency AC and low frequency AC and control its transmission power, and to perform power conversion between DC and power frequency AC and control its transmission power.

[0074] The coordination control output unit 5 is used to coordinate the control of multiple power frequency AC ports 2 and multiple low frequency AC ports 3, and to shape the synchronous characteristics of the multiple power frequency AC ports 2 and multiple low frequency AC ports 3.

[0075] It is understandable that "shaping the synchronous characteristics of multiple power frequency AC ports 2 and multiple low frequency AC ports 3" means shaping the output characteristics of multiple power frequency AC ports 2 and multiple low frequency AC ports 3 so that they have synchronous output characteristics for the connected power frequency AC system and low frequency AC system.

[0076] The aggregation station provided by this invention can provide "three-dimensional" access ports that can cover multiple levels of DC voltage and access ports for all levels of power frequency AC and low frequency AC voltage.

[0077] Furthermore, the multiple DC ports 1 include: multiple medium / high voltage DC collection ports, multiple medium / high voltage DC energy storage / discharge ports, and high voltage DC transmission ports.

[0078] Furthermore, the multiple power frequency AC ports 2 include: multiple power frequency AC aggregation ports, multiple power frequency AC energy storage / discharge ports, and multiple power frequency AC transmission ports.

[0079] Furthermore, the low-frequency AC ports include: multiple low-frequency AC aggregation ports.

[0080] It should be noted that the port types of the aggregation station of the present invention, in terms of function, include: DC aggregation port, low-frequency AC aggregation port, power frequency AC aggregation port, DC transmission port, AC transmission port, DC energy storage / discharge port, and AC energy storage / discharge port.

[0081] The voltage of the high-voltage DC ports (including DC collection ports, DC transmission ports, and DC energy storage / discharge ports) covers voltage levels such as ±800kV and ±500kV. The collection ports can be used for GW-level large-scale collection of new energy sources. The transmission ports can transmit to remote load centers via high-voltage DC transmission lines. The energy storage / discharge ports can be connected to GW-level large-capacity DC energy storage / discharge devices.

[0082] The voltage of the medium and high voltage DC ports (including DC collection ports and DC energy storage / discharge ports) covers voltage levels such as ±200kV, ±100kV, ±35kV, and ±10kV. The collection ports can be connected to nearby renewable energy sources of up to 100MW level, and the energy storage / discharge ports can be connected to DC energy storage / discharge devices of up to 100MW level.

[0083] The power frequency AC port (including power frequency AC aggregation port, power frequency AC transmission port, and power frequency AC energy storage / discharge port) can be connected to power frequency AC systems of different voltage levels. The aggregation port can be connected to new energy power plants in the form of power frequency AC, the transmission port can be connected to the power frequency AC power grid, and the energy storage / discharge port can be connected to power frequency AC energy storage / discharge devices or systems, etc.

[0084] The low-frequency AC aggregation port can connect to low-frequency AC systems of different voltage levels, mainly for new energy power plants and other applications using low-frequency AC technology.

[0085] Both power frequency AC and low frequency AC ports can provide active support to the connected AC system in terms of voltage, frequency, and inertia through the characteristics of the whole station synchronous machine;

[0086] Each port has bidirectional power flow capability, and the systems connected to each port can achieve power complementarity and mutual assistance.

[0087] This invention enables the interconnection of DC lines of different voltage levels, low-frequency AC, and power frequency AC systems, thereby forming a "heterogeneous" AC and DC power grid.

[0088] Furthermore, multiple medium / high voltage DC aggregation ports, multiple low frequency AC aggregation ports, and multiple power frequency AC aggregation ports constitute the energy aggregation side ports;

[0089] Multiple medium / high voltage DC energy storage / discharge ports constitute the DC energy storage / discharge side port;

[0090] Multiple power frequency AC energy storage / discharge ports constitute the AC energy storage / discharge side port;

[0091] The transmission side consists of a high-voltage DC transmission port and multiple power frequency AC transmission ports.

[0092] In some embodiments, AC / DC circuit breakers are configured at each port outlet to achieve rapid physical isolation, reduce fault coupling between connected systems, and improve system operational reliability and fault response capabilities.

[0093] Furthermore, such as Figure 2 As shown, the power conversion unit 4 includes: a high-voltage multi-port DC / DC voltage conversion unit DC / DC6, a DC to power frequency AC conversion unit DC / AC7, and a power frequency AC to low frequency AC conversion unit AC / AC8.

[0094] Each DC side of the high-voltage multi-port DC-DC converter unit (DC / DC6) is connected to multiple medium / high voltage DC collection ports, multiple medium / high voltage DC energy storage / discharge ports, and a high voltage DC transmission port, respectively.

[0095] The DC side of the DC / AC converter unit DC / AC7 is connected to one DC side of the high-voltage multi-port DC / DC converter unit DC / DC6, and the AC side is connected to the power frequency AC bus.

[0096] The low-frequency AC side of the AC / AC8 power frequency AC to low-frequency AC conversion unit is connected to multiple low-frequency AC collection ports, and the power frequency AC side is connected to the power frequency AC bus.

[0097] The coordinated control output unit 5 is connected to the power frequency AC bus;

[0098] Multiple power frequency AC aggregation ports, multiple power frequency AC energy storage / discharge ports, and multiple power frequency AC transmission ports are all connected to the power frequency AC bus.

[0099] Furthermore, the high-voltage multi-port DC / DC converter unit DC / DC6 is used to control the transmission power and input / output DC voltage levels of multiple medium / high voltage DC collection ports, multiple medium / high voltage DC energy storage / discharge ports, and high voltage DC transmission ports;

[0100] The DC / AC7 DC to AC converter unit is used to perform power conversion between DC and AC formats and control its transmission power.

[0101] The AC / AC8 power frequency to low frequency AC conversion unit is used to perform power conversion between power frequency AC and low frequency AC and control its transmission power.

[0102] Furthermore, the coordination control output unit 5 includes:

[0103] The power frequency AC port control output module is used to allocate the output power of multiple power frequency AC ports 2 and to shape the synchronous characteristics of multiple power frequency AC ports 2.

[0104] The low-frequency AC port control output module is used to allocate the output power of multiple low-frequency AC ports 3 and to shape the low-frequency AC synchronous characteristics of multiple low-frequency AC ports 3.

[0105] It is understandable that "shaping the synchronous characteristics of multiple power frequency AC ports 2" means shaping the output characteristics of multiple power frequency AC ports 2 so that they have synchronous output characteristics for the connected power frequency AC system.

[0106] "Shaping the low-frequency AC synchronous characteristics of multiple low-frequency AC ports 3" means shaping the low-frequency AC output characteristics of multiple low-frequency AC ports 3 so that they have synchronous output characteristics for the connected low-frequency AC system.

[0107] The DC / AC7 converter unit, AC / AC8 converter unit, and coordinated control output unit 5 involved in this invention all have synchronous machine characteristic shaping function. Through their synchronous machine characteristic shaping function, they provide active support for the AC system (AC collection port and AC transmission port) connected to the AC bus in terms of voltage, frequency, and inertia.

[0108] Furthermore, the power frequency AC aggregation port is connected to the power frequency new energy power station via a power frequency AC line;

[0109] The low-frequency AC collection port is connected to the low-frequency AC new energy power station via a low-frequency AC line;

[0110] The medium / high voltage DC collection port is connected to the DC new energy power station via a DC line;

[0111] The medium / high voltage DC energy storage / discharge port is connected to the DC energy storage / discharge device;

[0112] The high-voltage direct current transmission port is connected to the remote load center via a high-voltage direct current transmission line;

[0113] The power frequency AC transmission port is connected to the power frequency AC power grid of various voltage levels;

[0114] The power frequency AC energy storage / discharge port is connected to the power frequency AC energy storage / discharge device and / or power frequency AC energy storage / discharge system via a power frequency AC line.

[0115] This invention compensates for or absorbs the power difference between the collection port and the transmission port of the collection station by simultaneously connecting DC and power frequency energy storage / dissipation devices of different voltage levels, connecting the DC energy storage / dissipation device through the DC energy storage / dissipation port, and connecting the power frequency AC energy storage / dissipation device through the power frequency AC energy storage / dissipation port.

[0116] This invention provides a three-dimensional multi-port synchronous machine characteristic shaping topology architecture suitable for heterogeneous access of new energy sources, forming an energy aggregation hub capable of enabling the aggregation, access, and consumption of new energy sources of different scales and types. It provides a system architecture solution for the aggregation, transmission, and efficient consumption of new energy. Based on the designed three-dimensional multi-port synchronous machine characteristic shaping topology architecture suitable for heterogeneous access of new energy sources, this invention realizes the large-scale aggregation, development, and utilization of multiple points and types of new energy sources. It interconnects DC, power frequency AC, and low-frequency AC new energy aggregation lines with different transmission capacities and voltage levels. By constructing the characteristics of the entire station's synchronous machine, it provides active support for the accessed power frequency / low-frequency AC new energy power plants and power frequency AC systems in terms of voltage, frequency, and inertia. It provides interfaces for GW-level and above high-voltage DC transmission channels, while simultaneously smoothing the overall power fluctuations of the new energy aggregation system. Its "heterogeneity" is mainly reflected in the fact that the energy collection station can provide multiple types of new energy access ports, including DC, power frequency AC, and low frequency AC, and each port can share the backup capacity provided by connected energy storage devices; its "three-dimensional" nature is mainly reflected in the fact that the energy collection station can provide access ports of multiple voltage levels, covering multiple levels of DC voltage such as ±800kV, ±500kV, ±200kV, ±100kV, ±35kV, and ±10kV, as well as all levels of power frequency AC and low frequency AC voltage; its "synchronous machine characteristic shaping" is mainly reflected in the synchronous machine characteristics shaped by the shared access of grid-type power electronic devices and synchronous motors on its AC ports, which provide active support for the connected power frequency / low frequency AC new energy power plants and power frequency AC systems in terms of voltage, frequency, and inertia. By shaping the three-dimensional multi-port synchronous machine characteristics suitable for heterogeneous new energy access, the collection station can form an energy collection hub that can realize the collection and access of new energy of different scales and types and friendly consumption, providing a system architecture solution for new energy collection, transmission, and consumption.

[0117] To further illustrate the characteristics of the aforementioned three-dimensional multi-port synchronizer in shaping the aggregation station, such as... Figure 3 As shown, this invention provides a typical application scenario for a three-dimensional multi-port synchronous machine-shaped aggregation station suitable for heterogeneous access of new energy sources, including the following:

[0118] In terms of new energy aggregation and access, new energy power plants that are transmitted via DC lines are connected through DC medium and high voltage aggregation ports, new energy power plants that are transmitted via low frequency AC lines are connected through low frequency AC aggregation ports, and new energy power plants that are transmitted via power frequency AC lines are connected through power frequency AC aggregation ports.

[0119] In terms of new energy transmission, the power is transmitted to remote load centers via high-voltage DC transmission ports and high-voltage DC transmission lines, and connected to power frequency AC grids of different voltage levels via power frequency AC transmission ports.

[0120] In terms of power balance, DC energy storage devices or DC energy dissipation devices are connected through DC energy storage / dissipation ports, and power frequency AC energy storage devices or power frequency AC energy dissipation devices are connected through power frequency AC energy storage / dissipation ports to compensate for or absorb the power difference between the collection port and the transmission port of the collection station.

[0121] In terms of active support for power frequency AC, for the new energy power plants connected to the power frequency AC collection port and the AC power grid connected to the power frequency transmission port, the power frequency AC grid-type energy storage device or synchronous motor is connected through the power frequency AC energy storage / discharge port. The synchronous machine characteristics are shaped by the DC to power frequency AC conversion unit DC / AC7, the power frequency AC to low frequency AC conversion unit AC / AC8 and other reactive power generation devices inside the collection station to provide active support for the power frequency AC system (collection port and transmission port) connected to the AC bus in terms of voltage, frequency and inertia. The frequency regulation energy is provided by the collection station through AC / DC energy storage devices, etc.

[0122] In terms of active support for low-frequency AC, for new energy power plants connected to the low-frequency AC collection port, the AC / AC8 power frequency AC to low-frequency AC conversion unit with synchronous machine characteristic shaping function inside the collection station provides active support for the low-frequency AC system connected to the AC bus in terms of voltage, frequency and inertia. The frequency regulation energy is provided by the collection station through AC / DC energy storage devices, etc.

[0123] Example 2

[0124] This invention also provides a control method for a three-dimensional multi-port synchronous machine characteristic shaping aggregation station, such as... Figure 4 As shown, it includes:

[0125] Multiple DC ports 1 are used to connect DC systems of different voltage levels;

[0126] Multiple power frequency AC ports 2 are used to connect power frequency AC systems of different voltage levels;

[0127] Multiple low-frequency AC ports 3 are used to connect low-frequency AC systems of different voltage levels;

[0128] The power conversion unit 4 is used to control the transmission power and input / output DC voltage levels of multiple DC ports 1, as well as to perform power conversion between power frequency AC and low frequency AC and control its transmission power, and to perform power conversion between DC and power frequency AC and control its transmission power.

[0129] The coordinated control output unit 5 is used to coordinate the control of multiple power frequency AC ports 2 and multiple low frequency AC ports 3, and to shape the synchronous characteristics of the multiple power frequency AC ports 2 and multiple low frequency AC ports 3.

[0130] Furthermore, the power conversion unit 4 controls the transmission power and input / output DC voltage levels of multiple DC ports 1, performs power conversion between power frequency AC and low frequency AC and controls its transmission power, and performs power conversion between DC and power frequency AC and controls its transmission power, including:

[0131] The DC / DC6 high-voltage multi-port DC-DC converter unit controls the transmission power and input / output DC voltage levels of multiple medium / high voltage DC collection ports, multiple medium / high voltage DC energy storage / discharge ports, and high voltage DC transmission ports.

[0132] The DC / AC7 DC to AC converter unit is used to convert power from DC to AC and control its transmission power.

[0133] The AC / AC8 power conversion unit is used to convert power frequency AC to low frequency AC and control its transmission power.

[0134] Furthermore, the coordinated control output unit 5 is used to perform coordinated control of multiple power frequency AC ports 2 and multiple low frequency AC ports 3, and to shape the synchronous characteristics of the multiple power frequency AC ports 2 and multiple low frequency AC ports 3, including:

[0135] The output module is used to distribute the output power of multiple power frequency AC ports 2 and to shape the synchronous characteristics of multiple power frequency AC ports 2.

[0136] The output power of multiple low-frequency AC ports 3 is allocated by the low-frequency AC port control output module, and the low-frequency AC synchronous characteristics of multiple low-frequency AC ports 3 are shaped.

[0137] It is understood that the above-described method embodiments correspond to the above-described aggregation station embodiments, and the specific details can be referred to each other, which will not be repeated here.

[0138] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0139] Example 3

[0140] like Figure 5 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0141] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the control method for shaping the characteristics of a three-dimensional multi-port synchronous machine in the above embodiments.

[0142] Example 4

[0143] Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the control method for a three-dimensional multi-port synchronous machine characteristic shaping aggregation station in the above embodiments.

[0144] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0146] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0147] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A stereoscopic multi-port sync machine feature molding hub, characterized by, The application relates to a power transmission system, which comprises a plurality of DC ports, a plurality of power frequency AC ports, a plurality of low frequency AC ports, a power conversion unit and a coordinated control output unit. The power conversion unit is connected with the plurality of DC ports and the plurality of low frequency AC ports respectively; the coordinated control output unit is connected with the power conversion unit, the plurality of low frequency AC ports and the plurality of power frequency AC ports respectively. The plurality of DC ports are used for connecting DC systems of different voltage levels. The plurality of power frequency AC ports are used for connecting power frequency AC systems of different voltage levels. The plurality of low frequency AC ports are used for connecting low frequency AC systems of different voltage levels. The power conversion unit is used for controlling the transmission power and input / output DC voltage level of the plurality of DC ports, and performing power conversion between power frequency AC and low frequency AC and controlling the transmission power, and performing power conversion between DC and power frequency AC and controlling the transmission power. The coordinated control output unit is used for performing coordinated control of the plurality of power frequency AC ports and the plurality of low frequency AC ports, and shaping the synchronous machine characteristics of the plurality of power frequency AC ports and the plurality of low frequency AC ports. The plurality of DC ports comprise a plurality of medium / high voltage DC collection ports, a plurality of medium / high voltage DC energy storage / discharge ports and a high voltage DC transmission port. The plurality of power frequency AC ports comprise a plurality of power frequency AC collection ports, a plurality of power frequency AC energy storage / discharge ports and a plurality of power frequency AC transmission ports. The low frequency AC port comprises a plurality of low frequency AC collection ports. The power conversion unit comprises a high voltage multi-port DC voltage conversion unit DC / DC, a DC and power frequency AC conversion unit DC / AC and a power frequency AC and low frequency AC conversion unit AC / AC. Each DC side of the high voltage multi-port DC voltage conversion unit DC / DC is connected with the plurality of medium / high voltage DC collection ports, the plurality of medium / high voltage DC energy storage / discharge ports and the high voltage DC transmission port respectively. The DC side of the DC and power frequency AC conversion unit DC / AC is connected with one DC side of the high voltage multi-port DC voltage conversion unit DC / DC, and the AC side is connected with a power frequency AC bus. The low frequency AC side of the power frequency AC and low frequency AC conversion unit AC / AC is connected with the plurality of low frequency AC collection ports, and the power frequency AC side is connected with a power frequency AC bus. The coordinated control output unit is connected with the power frequency AC bus. The plurality of power frequency AC collection ports, the plurality of power frequency AC energy storage / discharge ports and the plurality of power frequency AC transmission ports are connected with the power frequency AC bus. The coordinated control output unit comprises: A power frequency AC port control output module, which is used for distributing the output power of the plurality of power frequency AC ports, and shaping the synchronous machine characteristics of the plurality of power frequency AC ports in the power frequency AC mode. A low frequency AC port control output module, which is used for distributing the output power of the plurality of low frequency AC ports, and shaping the synchronous machine characteristics of the plurality of low frequency AC ports in the low frequency AC mode. ​ The power frequency AC collection port is connected with a power frequency new energy station through a power frequency AC line; The low frequency AC collection port is connected with a low frequency AC new energy station through a low frequency AC line; The medium / high voltage DC collection port is connected with a DC new energy station through a DC line; The medium / high voltage DC energy storage / discharge port is connected with a DC energy storage / discharge device; The high voltage DC transmission port is connected with a remote load center through a high voltage DC transmission line; The power frequency AC transmission port is connected with power frequency AC power grids of different voltage levels; The power frequency AC energy storage / discharge port is connected with a power frequency AC energy storage / discharge device through a power frequency AC line.

2. The stereoscopic multi-port synchrotron feature sculpting hub of claim 1, wherein, The multiple medium / high voltage DC collection ports, the multiple low frequency AC collection ports and the multiple power frequency AC collection ports form energy collection side ports; The multiple medium / high voltage DC energy storage / discharge ports form DC energy storage / discharge side ports; The multiple power frequency AC energy storage / discharge ports form AC energy storage / discharge side ports; The high voltage DC transmission port and the multiple power frequency AC transmission ports form transmission sides.

3. The stereoscopic multi-port synchrotron feature sculpting hub of claim 1, wherein, The high voltage multi-port DC voltage conversion unit DC / DC is used for controlling transmission power and input / output DC voltage levels of the multiple medium / high voltage DC collection ports, the multiple medium / high voltage DC energy storage / discharge ports and the high voltage DC transmission port; The DC and power frequency AC conversion unit DC / AC is used for power conversion between DC and power frequency AC forms and controlling transmission power thereof; The power frequency AC and low frequency AC conversion unit AC / AC is used for power conversion between power frequency AC and low frequency AC forms and controlling transmission power thereof.

4. The method of claim 1-3, wherein the method is a method of controlling a three-dimensional multi-port synchro characteristic molding collection station, characterized in that, It comprises: Multiple DC ports are used for connecting DC systems of different voltage levels; Multiple power frequency AC ports are used for connecting power frequency AC systems of different voltage levels; Multiple low frequency AC ports are used for connecting low frequency AC systems of different voltage levels; A power conversion unit is used for controlling transmission power and input / output DC voltage levels of the multiple DC ports, power conversion between power frequency AC and low frequency AC forms and controlling transmission power thereof, and power conversion between DC and power frequency AC forms and controlling transmission power thereof; A coordinated control output unit is used for coordinated control of the multiple power frequency AC ports and the multiple low frequency AC ports, and shaping of synchronous machine characteristics of the multiple power frequency AC ports and the multiple low frequency AC ports.

5. The method of claim 4, wherein, The use of the power conversion unit for controlling transmission power and input / output DC voltage levels of the multiple DC ports, power conversion between power frequency AC and low frequency AC forms and controlling transmission power thereof, and power conversion between DC and power frequency AC forms and controlling transmission power thereof comprises: A high voltage multi-port DC voltage conversion unit DC / DC is used for controlling transmission power and input / output DC voltage levels of the multiple medium / high voltage DC collection ports, the multiple medium / high voltage DC energy storage / discharge ports and the high voltage DC transmission port; The DC / AC unit is used to convert power between DC and AC and control the transmission power. The AC / AC unit is used to convert power between AC and low frequency AC and control the transmission power.

6. The method of claim 4, wherein, The coordination control of the multiple AC ports and the multiple low frequency AC ports by the coordination control output unit, and the shaping of the synchronous machine characteristics of the multiple AC ports and the multiple low frequency AC ports, include: The AC port control output module is used to distribute the output power of the multiple AC ports and shape the synchronous machine characteristics of the multiple AC ports in AC. The low frequency AC port control output module is used to distribute the output power of the multiple low frequency AC ports and shape the synchronous machine characteristics of the multiple low frequency AC ports in low frequency AC.

7. An electronic device, comprising: It includes: At least one processor and a memory; The memory and the processor are connected through a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the control method of the three-dimensional multi-port synchronous machine characteristic shaping collection station is realized.

8. A readable storage medium, characterized by, The execution program is stored thereon, and when the execution program is executed, the control method of the three-dimensional multi-port synchronous machine characteristic shaping collection station is realized.

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