A 110kV power grid structure suitable for overload

Abstract

The utility model provides a 110kV power grid structure suitable for overload, relates to the field of power grid power supply structure design, and solves the problems of unreasonable power grid structure layout and low reliability in traditional 110kV substations; the structure comprises a 110kV bus, and a first power line and a second power line are respectively connected to the 110kV bus; the first power line is connected to a load F1, and the second power line is connected to a load F2; lead-out lines of the first power line and the second power line are connected in parallel to an energy storage system G1; the first power line comprises a 10kV bus M1, and the second power bus comprises a 10kV bus M2, and the 10kV bus M1 and the 10kV bus M2 are connected to each other through an AC / AC bidirectional converter V0; the utility model can effectively realize demand management when load fluctuations are large, and improve power supply reliability.

Description

Technical Field

[0001] The utility model relates to the field of power supply structure design of power grid, in particular to a 110kV power grid structure suitable for overload. Background Art

[0002] In today's society, with the rapid development of industrialization and informatization and the significant improvement of people's living standards, the demand for power supply is growing, not only in terms of quantity, but also in terms of quality. Modern life and industrial production are increasingly dependent on electricity, which places unprecedented high standards on the power supply capacity and quality of the power grid. Especially for critical infrastructure, data centers and large-scale manufacturing industries, continuous, stable and efficient power supply is the cornerstone of their smooth operation.

[0003] Traditionally, 110kV substations, as important nodes for power distribution in cities and surrounding areas, bear the heavy responsibility of delivering electricity to a large number of users. However, as time goes by, the layout and design of these substations have gradually revealed their limitations: on the one hand, the current and future growth trends in power load may not be fully foreseen in early planning, resulting in saturation of power supply capacity in some areas and difficulty in meeting the needs of new loads; on the other hand, due to factors such as geographical location and aging equipment, the reliability of some substations can no longer meet the high standards of modern power systems. Especially when encountering extreme weather, natural disasters or internal equipment failures, these substations often find it difficult to quickly restore power supply, which has a serious impact on economic and social operations.

[0004] Power supply reliability, that is, the ability of the power grid to continuously supply power within a specified time, has become one of the core indicators for measuring the performance of the power system. In order to ensure uninterrupted power service under any circumstances, reduce power outage time and reduce the frequency of power outages, it is urgent to optimize and transform the existing power grid structure and operation mode. This is not only to meet the basic power needs of users, but also to promote sustainable economic development and social harmony and stability.

[0005] In view of this, the industry generally recognizes that relying solely on traditional grid expansion and upgrading is no longer sufficient to meet the current challenges, especially in solving sudden load peaks, optimizing power resource allocation, and improving system flexibility. Therefore, exploring innovative structures and introducing new power system components have become key ways to improve the overall efficiency of power systems, and those skilled in the art have made it a focus of current research. Utility Model Content

[0006] Based on the current status of the background technology, the purpose of the utility model is to solve the problems of unreasonable grid structure layout and low reliability in traditional 110kV substations, and proposes a 110kV grid structure suitable for overload; by configuring an energy storage system and connecting to the multi-load structure of the existing power grid, the utility model can effectively realize demand management when the load fluctuates greatly and improve power supply reliability.

[0007] The utility model adopts the following technical solutions to achieve the purpose:

[0008] A 110kV power grid structure suitable for overload, the structure comprising a 110kV bus, to which a first power line and a second power line are respectively connected; the first power line is connected to a load F1, and the second power line is connected to a load F2; lead-out lines of the first power line and the second power line are connected in parallel to an energy storage system G1; the first power line and the second power line are connected to each other via an AC / AC bidirectional converter V0.

[0009] Specifically, the first power supply line includes a 10kV bus M1, and the 110kV bus is connected to the load F1 through the 10kV bus M1; the second power supply bus includes a 10kV bus M2, and the 110kV bus is connected to the load F2 through the 10kV bus M2.

[0010] Specifically, the 10 kV bus M1 and the 10 kV bus M2 are connected to each other through an AC / AC bidirectional converter V0.

[0011] Specifically, the first power supply line also includes a main transformer T1, a main transformer outlet switch Q1, a transfer switch Q3 and a station transformer T3; the 110kV bus is connected to the 10kV bus M1 in turn through the main transformer T1 and the main transformer outlet switch Q1; the 10kV bus M1 is connected to the load F1 in turn through the transfer switch Q3 and the station transformer T3.

[0012] Specifically, the second power supply line also includes a main transformer T2, a main transformer outlet switch Q2, a transfer switch Q4 and a station transformer T4; the 110kV bus is connected to the 10kV bus M2 in turn through the main transformer T2 and the main transformer outlet switch Q2; the 10kV bus M2 is connected to the load F2 in turn through the transfer switch Q4 and the station transformer T4.

[0013] Preferably, a section switch Q11 is also provided on the 10kV bus M1; the section switch Q11 is led out from the connection line between the main transformer outlet switch Q1 and the transfer switch Q3, and the lead-out position of the section switch Q11 is on the side of the 10kV bus M1 away from the AC / AC bidirectional converter V0; the 10kV bus M1 located on the non-lead-out side of the section switch Q11 is connected to the energy storage system G1 through the energy storage system transfer switch Q5, the AC / DC bidirectional converter V1 and the DC transfer switch Q9 in sequence; the DC transfer switch Q9 is interlocked with the DC transfer switch Q10 led out from the 10kV bus M2 and connected to the energy storage system G1.

[0014] Preferably, a segment switch Q12 is also provided on the 10kV bus M2; the segment switch Q12 is led out from the connection line between the main transformer outlet switch Q2 and the transfer switch Q4, and the lead-out position of the segment switch Q12 is on the side of the 10kV bus M2 away from the AC / AC bidirectional converter V0; the 10kV bus M2 located on the non-lead-out side of the segment switch Q12 is connected to the energy storage system G1 through the energy storage system transfer switch Q6, the AC / DC bidirectional converter V2 and the DC transfer switch Q10 in sequence; the DC transfer switch Q10 is interlocked with the DC transfer switch Q9 led out from the 10kV bus M1 and connected to the energy storage system G1.

[0015] Preferably, the 10 kV busbar M1 located at the non-lead-out side portion of the segment switch Q11 is also connected to the photovoltaic interface via the photovoltaic transfer switch Q13.

[0016] Preferably, the 10 kV busbar M2 located at the non-lead-out side portion of the segment switch Q12 is also connected to the photovoltaic interface via the photovoltaic transfer switch Q14.

[0017] Specifically, the 10 kV busbar M1 is also connected to the 10 kV busbar W1 outside the station through the tie switch Q7, and the 10 kV busbar M2 is also connected to the 10 kV busbar W2 outside the station through the tie switch Q8.

[0018] In summary, due to the adoption of this technical solution, the beneficial effects of the utility model are as follows:

[0019] By configuring the energy storage system, the utility model can effectively implement the demand management strategy when the power grid faces large load fluctuations, smooth out power output fluctuations, ensure stable operation of the power grid, and improve the quality of power. When the power station encounters a fault or performs regular maintenance, the energy storage system can quickly intervene in the power supply and be used as an emergency power supply, which significantly enhances the uninterrupted power supply capacity of the power grid, reduces the risk of power outages caused by faults, and ensures the continuity of power supply to users inside and outside the station.

[0020] By utilizing the peak-shaving and valley-filling function of the energy storage system and combining it with the region-specific peak-valley electricity price mechanism, the utility model can achieve efficient allocation of power resources, maximize economic benefits through the storage and release of electric energy during peak and valley periods, and bring direct economic benefits to power grid operators and end users.

[0021] The utility model also reserves a photovoltaic interface, which can be connected to the photovoltaic green power system in the future, which not only improves the environmental protection attributes of the power grid, but also promotes the clean transformation of the energy structure, reduces dependence on fossil fuels, and reduces carbon emissions. In the case of insufficient power station capacity, the integrated access of the energy storage system and photovoltaic green electricity can not only effectively alleviate the capacity pressure, but also reduce the operation and maintenance costs and carbon footprint of traditional power generation facilities, which has a positive effect on mitigation and protection.

[0022] In addition, when a transformer in the power grid is overloaded, the utility model can flexibly allocate the remaining capacity of other transformers to achieve load balancing and avoid system risks caused by single-point overload. At the same time, it can be combined with the on-demand design of the power transfer strategy to ensure that the power supply service is not affected during line maintenance, further consolidating the reliability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the power grid structure and connection relationship of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0026] Example

[0027] like Figure 1As shown, a 110kV power grid structure suitable for overload has a 110kV busbar, to which a first power line and a second power line are respectively connected; the first power line is connected to a load F1, and the second power line is connected to a load F2; and the lead-out lines of the first power line and the second power line are connected in parallel to an energy storage system G1.

[0028] In this embodiment, the first power supply line includes a 10kV busbar M1, a main transformer T1, a main transformer outlet switch Q1, a transfer switch Q3, and a station transformer T3. The second power supply line includes a 10kV busbar M2, a main transformer T2, a main transformer outlet switch Q2, a transfer switch Q4, and a station transformer T4. The connections of the components are as follows:

[0029] In general, the 110kV bus is connected to the load F1 through the 10kV bus M1, and is also connected to the load F2 through the 10kV bus M2; the load F1 and the load F2 can be the load within the substation or the user load outside the substation.

[0030] Specifically, the 110kV bus is connected to the 10kV bus M1 through the main transformer T1 and the main transformer outlet switch Q1 in sequence; the 10kV bus M1 is connected to the load F1 through the transfer switch Q3 and the station transformer T3 in sequence. The 110kV bus is connected to the 10kV bus M2 through the main transformer T2 and the main transformer outlet switch Q2 in sequence; the 10kV bus M2 is connected to the load F2 through the transfer switch Q4 and the station transformer T4 in sequence.

[0031] At the same time, the 10kV busbar M1 and the 10kV busbar M2 are connected to each other through the AC / AC bidirectional converter V0. Through the AC / AC bidirectional converter V0, the demand management of the load F1 or the load F2 can be performed. When the load F1 corresponding to the first power line is too large and the main transformer T1 is overloaded, the excess load of the first power line can be transferred to the second power line through the AC / AC bidirectional converter V0. Similarly, when the load F2 corresponding to the second power line is too large and the main transformer T2 is overloaded, the excess load of the second power line can be transferred to the first power line through the AC / AC bidirectional converter V0.

[0032] Regarding the specific connection structure involving the energy storage system G1, this embodiment adopts the following preferred design: a section switch Q11 is also provided on the 10kV bus M1; the section switch Q11 is led out from the connection line between the main transformer outlet switch Q1 and the transfer switch Q3, and the lead-out position of the section switch Q11 is on the side of the 10kV bus M1 away from the AC / AC bidirectional converter V0; the 10kV bus M1 located on the non-lead-out side of the section switch Q11 is connected to the energy storage system G1 through the energy storage system transfer switch Q5, the AC / DC bidirectional converter V1 and the DC transfer switch Q9 in sequence; the DC transfer switch Q9 is interlocked with the DC transfer switch Q10 led out from the 10kV bus M2 and connected to the energy storage system G1.

[0033] At the same time, a section switch Q12 is also provided on the 10kV bus M2; the section switch Q12 is led out from the connection line between the main transformer outlet switch Q2 and the transfer switch Q4, and the lead-out position of the section switch Q12 is on the side of the 10kV bus M2 away from the AC / AC bidirectional converter V0; the 10kV bus M2 located on the non-lead-out side of the section switch Q12 is connected to the energy storage system G1 through the energy storage system transfer switch Q6, the AC / DC bidirectional converter V2 and the DC transfer switch Q10 in sequence; the DC transfer switch Q10 is interlocked with the DC transfer switch Q9 led out from the 10kV bus M1 and connected to the energy storage system G1.

[0034] In this embodiment, the lead wires of the DC transfer switch Q9 and the DC transfer switch Q10 are connected in parallel to the DC 1500V terminal of the energy storage system G1. The energy storage system G1 is equipped with an energy storage battery pack, so that both the first power supply line and the second power supply line can use it, saving the area occupied by the substation. In addition, considering the safety of use and the performance efficiency of the energy storage battery, this embodiment makes the design decision of interlocking the DC transfer switch Q9 and the DC transfer switch Q10.

[0035] During the operation of the substation, when the load of the first power supply line or the second power supply line is large, the energy storage system G1 can be introduced into the power grid through the energy storage system transfer switch Q5 or Q6, and the corresponding load demand management can be performed through the energy storage system G1, so that the main transformer T1 or the main transformer T2 can operate under rated conditions. In addition, the energy storage system G1 enables the power grid to have the dual functions of peak shaving and valley filling, and combined with the local peak and valley electricity prices of the substation, it can improve the economy of power supply of the power grid.

[0036] In this embodiment, the 10kV busbar M1 is also connected to the 10kV busbar W1 outside the station through the tie switch Q7, and the 10kV busbar M2 is also connected to the 10kV busbar W2 outside the station through the tie switch Q8. When the load of the first power line or the second power line does not need the energy storage system G1 to transfer, the section switch Q11 or Q12 can be opened, the tie switch Q7 or Q8 can be closed, and the energy storage system transfer switch Q5 or Q6 can be closed, so that the energy storage system G1 can supply power to the 10kV busbar W1 outside the station or the 10kV busbar W2 outside the station.

[0037] As another preferred embodiment of the present invention, the 10kV busbar M1 located at the non-lead-out side of the segment switch Q11 is also connected to the photovoltaic interface through the photovoltaic transfer switch Q13. Similarly, the 10kV busbar M2 located at the non-lead-out side of the segment switch Q12 is also connected to the photovoltaic interface through the photovoltaic transfer switch Q14. The photovoltaic interface is designed in a reserved manner, and can be connected to photovoltaic green power facilities in the future to reduce the power demand of the power grid, and use photovoltaic power generation as a solution to replace the 110kV busbar power supply transformation, thereby reducing carbon emissions.

[0038] Finally, for the 110kV power grid structure of this embodiment, a corresponding power grid control device can also be configured. For example: for the energy storage system G1, an information acquisition device can be configured for it, so as to characterize the access characteristics of the energy storage system G1 after it is connected to the current power grid structure. A transfer strategy device is designed to provide a corresponding transfer strategy according to load changes, and the transfer strategy is limited to considering the transfer within the station, and only considers the transfer outside the station when the transfer conditions within the station are not met. A strategy executor is designed to execute whether the energy storage system G1 is put into use or not according to the transfer strategy.

[0039] The devices, logic and programs required for the grid control device are all mature technologies in this field. Information characteristics and load state change response are also common electrical knowledge in the power supply and distribution field. They can be selected as needed according to the grid structure of this embodiment, so they will not be repeated here.

[0040] In summary, the utility model not only improves the comprehensive performance of the power grid, including power supply reliability, economic efficiency and environmental friendliness, but also lays a technical foundation for future green energy access and smart grid development, demonstrating practical social and economic benefits and environmental protection value by integrating the energy storage system into the existing 110kV power grid architecture and conducting structural design.

Claims

1. A 110kV power grid structure suitable for overload, characterized in that: The structure has a 110kV bus, to which the first power line and the second power line are respectively connected; the first power line is connected to the load F1, and the second power line is connected to the load F2; the lead-out lines of the first power line and the second power line are connected in parallel to the energy storage system G1; the first power line and the second power line are connected to each other through an AC / AC bidirectional converter V0.

2. The 110kV power grid structure suitable for overload according to claim 1 is characterized in that: The first power supply line includes a 10 kV bus M1, and the 110 kV bus is connected to the load F1 through the 10 kV bus M1; the second power supply bus includes a 10 kV bus M2, and the 110 kV bus is connected to the load F2 through the 10 kV bus M2.

3. The 110 kV power grid structure suitable for overload according to claim 2 is characterized in that: The 10 kV busbar M1 and the 10 kV busbar M2 are connected to each other via an AC / AC bidirectional converter V0.

4. The 110 kV power grid structure suitable for overload according to claim 3 is characterized in that: The first power supply line also includes a main transformer T1, a main transformer outlet switch Q1, a transfer switch Q3 and a station transformer T3; the 110kV bus is connected to the 10kV bus M1 in turn through the main transformer T1 and the main transformer outlet switch Q1; the 10kV bus M1 is connected to the load F1 in turn through the transfer switch Q3 and the station transformer T3.

5. The 110 kV power grid structure suitable for overload according to claim 3 is characterized in that: The second power supply line also includes a main transformer T2, a main transformer outlet switch Q2, a transfer switch Q4 and a station transformer T4; the 110kV bus is connected to the 10kV bus M2 in turn through the main transformer T2 and the main transformer outlet switch Q2; the 10kV bus M2 is connected to the load F2 in turn through the transfer switch Q4 and the station transformer T4.

6. The 110 kV power grid structure suitable for overload according to claim 4 is characterized in that: A section switch Q11 is also provided on the 10kV busbar M1; the section switch Q11 is led out from the connection line between the main transformer outlet switch Q1 and the transfer switch Q3, and the lead-out position of the section switch Q11 is on the side of the 10kV busbar M1 away from the AC / AC bidirectional converter V0; the 10kV busbar M1 located on the non-lead-out side of the section switch Q11 is connected to the energy storage system G1 through the energy storage system transfer switch Q5, the AC / DC bidirectional converter V1 and the DC transfer switch Q9 in sequence; the DC transfer switch Q9 is interlocked with the DC transfer switch Q10 led out from the 10kV busbar M2 and connected to the energy storage system G1.

7. The 110 kV power grid structure suitable for overload according to claim 5, characterized in that: A section switch Q12 is also provided on the 10kV busbar M2; the section switch Q12 is led out from the connection line between the main transformer outlet switch Q2 and the transfer switch Q4, and the lead-out position of the section switch Q12 is on the side of the 10kV busbar M2 away from the AC / AC bidirectional converter V0; the 10kV busbar M2 located on the non-lead-out side of the section switch Q12 is connected to the energy storage system G1 through the energy storage system transfer switch Q6, the AC / DC bidirectional converter V2 and the DC transfer switch Q10 in sequence; the DC transfer switch Q10 is interlocked with the DC transfer switch Q9 led out from the 10kV busbar M1 and connected to the energy storage system G1.

8. The 110 kV power grid structure suitable for overload according to claim 6, characterized in that: The 10 kV busbar M1 located at the non-lead-out side of the section switch Q11 is also connected to the photovoltaic interface through the photovoltaic transfer switch Q13.

9. The 110 kV power grid structure suitable for overload according to claim 7, characterized in that: The 10 kV busbar M2 located at the non-lead-out side portion of the section switch Q12 is also connected to the photovoltaic interface through the photovoltaic transfer switch Q14.

10. The 110 kV power grid structure suitable for overload according to claim 3, characterized in that: The 10kV busbar M1 is also connected to the 10kV busbar W1 outside the station through a tie switch Q7, and the 10kV busbar M2 is also connected to the 10kV busbar W2 outside the station through a tie switch Q8.

Images