A new energy station temporary overvoltage suppression device and a new energy station
Patent Information
- Application Number
- CN202510450926.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-10-20
AI Technical Summary
但是SVG响应时间较长，一般为40ms以上，且SVG具有电压反调现象，不仅无法实现暂时过电压的快速抑制，还存在加剧故障恢复过电压的风险
[0023]本申请提供的新能源场站暂时过电压抑制装置中，在新能源场站存在的暂时过电压超过预设的电压限值情况下，可控模块可以将均压模块旁路，吸能模块可以在暂时过电压超过电压限值的情况下，吸收新能源机组产生的能量并对暂时过电压进行抑制。在暂时过电压未超过电压限值的情况下，均压模块可以与吸能模块共同承受暂时过电压并减小抑制装置的漏电流。本申请通过可控模块、吸能模块和均压模块可以实现新能源场站暂时过电压的可靠抑制，本申请提供的抑制装置的抑制能力强，避免暂时过电压导致的新能源机组脱网，进而保证新能源场站所连接的交流系统/直流系统的安全稳定运行。
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Abstract
Description
Technical Field
[0001] This application relates to the field of new energy technology, specifically to a temporary overvoltage suppression device for a new energy power station and a new energy power station. Background Technology
[0002] Under the new circumstances of implementing the "dual carbon" target, vigorously promoting clean energy power generation such as wind and solar power, and building large-scale integrated clean energy power generation bases such as wind power and photovoltaic power in desert areas, is an important measure in the energy and power sector. Large-scale integrated clean energy power generation bases such as wind power and photovoltaic power are mostly concentrated and transmitted to the grid. When the transmission system fails, the reactive power surplus can cause temporary overvoltages at the renewable energy power plants. When the overvoltage at the generator terminals of renewable energy units exceeds 1.3 PU, the units will disconnect from the grid within 10 ms at the fastest, affecting the safe and stable operation of the power grid and renewable energy units, and restricting the transmission capacity of renewable energy and the efficiency of the transmission system.
[0003] Currently, Static Var Generators (SVG) are commonly used to provide dynamic reactive power support for renewable energy power plants, enabling temporary overvoltage suppression. However, SVGs have a long response time, typically exceeding 40ms, and exhibit voltage reversal, failing to achieve rapid suppression of temporary overvoltages and potentially exacerbating the risk of overvoltages during fault recovery. In other words, these technologies have poor temporary overvoltage suppression capabilities, easily leading to grid disconnection of renewable energy units. Summary of the Invention
[0004] This application proposes a temporary overvoltage suppression device for a new energy power station, comprising a controllable module, an energy absorption module, and a voltage equalization module. The controllable module and the voltage equalization module are connected in parallel to form a controllable branch, which is connected in series with the energy absorption module.
[0005] The controllable module is used to bypass the voltage equalization module when a temporary overvoltage in a new energy power station exceeds a preset voltage limit.
[0006] The energy absorption module is used to absorb energy generated by the new energy unit and suppress the temporary overvoltage when the temporary overvoltage exceeds the voltage limit.
[0007] The voltage equalization module is used to: withstand temporary overvoltages together with the energy absorption module and reduce leakage current of the suppression device when the temporary overvoltage does not exceed the voltage limit.
[0008] In some possible implementations, the controllable module includes one or more controllable units connected in series.
[0009] The controllable unit includes a first thyristor and a second thyristor connected in antiparallel.
[0010] Optionally, the controllable unit may further include a first capacitor and a first nonlinear resistor. The first capacitor, the first nonlinear resistor, the first thyristor, and the second thyristor are connected in parallel.
[0011] Furthermore, the controllable module also includes a reactance, which is connected in series with the controllable unit.
[0012] For example, the controllable unit includes a triggering unit. The triggering unit, the first thyristor, and the second thyristor are connected in parallel, and the triggering unit is also connected to the respective control electrode of the first thyristor and the second thyristor.
[0013] The triggering unit is used to perform complementary control of the first thyristor and the second thyristor based on the terminal voltages of the first thyristor and the second thyristor.
[0014] In some other possible implementations, the controllable module may be a discharge gap or a controllable semiconductor device.
[0015] In some other possible implementations, the voltage equalization module includes one or more voltage equalization units connected in series.
[0016] The voltage equalization unit includes one or more second nonlinear resistors, which are connected in series, parallel, or a combination of series and parallel.
[0017] Furthermore, the voltage equalization unit also includes a second capacitor, which is connected in parallel with a second nonlinear resistor.
[0018] In some other possible implementations, the energy absorption module includes one or more energy absorption units connected in series.
[0019] The energy absorption unit includes one or more third nonlinear resistors, which are connected in series, parallel or a combination of series and parallel.
[0020] For example, the number of second nonlinear resistors is less than or equal to the number of third nonlinear resistors.
[0021] Furthermore, this application also provides a new energy power station, which may include the aforementioned suppression device.
[0022] Compared with the prior art, the beneficial effects of this application are as follows:
[0023] In the temporary overvoltage suppression device for renewable energy power plants provided in this application, when the temporary overvoltage at the renewable energy power plant exceeds a preset voltage limit, the controllable module can bypass the voltage equalization module, and the energy absorption module can absorb the energy generated by the renewable energy units and suppress the temporary overvoltage when the temporary overvoltage exceeds the voltage limit. When the temporary overvoltage does not exceed the voltage limit, the voltage equalization module and the energy absorption module can jointly withstand the temporary overvoltage and reduce the leakage current of the suppression device. This application can reliably suppress temporary overvoltages in renewable energy power plants through the controllable module, energy absorption module, and voltage equalization module. The suppression device provided in this application has strong suppression capabilities, avoids grid disconnection of renewable energy units caused by temporary overvoltages, and thus ensures the safe and stable operation of the AC / DC system connected to the renewable energy power plant.
[0024] This application can prevent new energy units from disconnecting from the grid due to overvoltage protection, improve the stability and power transmission capacity of new energy power plants, and facilitate the further widespread application of new energy power plants.
[0025] The suppression device provided in this application can achieve microsecond-level response without external control, deeply suppressing temporary overvoltages in new energy power plants, preventing new energy units from being disconnected from the grid due to overvoltage protection under fault conditions, and improving the stability of new energy grid connection.
[0026] The suppression device provided in this application requires no additional maintenance and is more suitable for centralized new energy power stations in remote areas, thus improving the economic efficiency of new energy power stations.
[0027] Compared with related technologies that involve installing synchronous condensers on the busbar, this application reduces the cost of the suppression device, the footprint, and the losses. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic structural diagram of a suppression device in an embodiment of this application;
[0030] Figure 2 This is another schematic structural diagram of the suppression device in the embodiments of this application;
[0031] Figure 3 This is a schematic structural diagram of a new energy power station in an embodiment of this application;
[0032] Figure 4This is a schematic structural diagram of the first module / second module in the embodiments of this application. Detailed Implementation
[0033] The technical solutions in this application will now be described with reference to the accompanying drawings.
[0034] The terms "first," "second," etc., used in the specification, embodiments, claims, and drawings of this application are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as including a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.
[0035] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0036] This application provides a temporary overvoltage suppression device for new energy power plants, such as... Figure 1 As shown. The suppression device 100 includes a controllable module 10, an energy absorption module 30, and a voltage equalization module 20. The controllable module 10 and the voltage equalization module 20 are connected in parallel to form a controllable branch. The controllable branch is connected in series with the energy absorption module 30.
[0037] Optionally, if a temporary overvoltage at a new energy power station exceeds a preset voltage limit, the controllable module 10 can be activated to bypass the voltage equalization module 20.
[0038] The energy absorption module 30 is used to absorb the energy generated by the new energy units in the new energy power station and suppress the temporary overvoltage when the temporary overvoltage exceeds the preset voltage limit.
[0039] The voltage equalization module 20 is used to: in the case that the temporary overvoltage does not exceed the voltage limit, it is connected in series with the energy absorption module 30 to jointly bear the temporary overvoltage and reduce the leakage current of the suppression device 100.
[0040] In some possible implementations, the controllable module 10 includes one or more controllable units 1 connected in series.
[0041] like Figure 2 As shown, the controllable unit 1 includes a first thyristor SCR1 and a second thyristor SCR2 connected in antiparallel.
[0042] Optionally, the controllable unit 1 further includes a first capacitor C1 and a first nonlinear resistor R1 (which can be a zinc oxide resistor). The first capacitor C1, the first nonlinear resistor R1, the first thyristor SCR1, and the second thyristor SCR2 are connected in parallel.
[0043] Further reference Figure 2 The controllable module 10 also includes a reactance L, which is connected in series with the controllable unit 1.
[0044] For example, the controllable unit 1 includes a triggering unit ( Figure 2 (Not shown in the image). The trigger unit, the first thyristor SCR1, and the second thyristor SCR2 are connected in parallel. The trigger unit is also connected to the control electrode of each of the first thyristor SCR1 and the second thyristor SCR2.
[0045] The triggering unit is used to perform complementary control of the first thyristor SCR1 and the second thyristor SCR2 based on the terminal voltages of the first thyristor SCR1 and the second thyristor SCR2. That is, it can control the first thyristor SCR1 to turn off and the second thyristor SCR2 to turn on, and it can also control the first thyristor SCR1 to turn on and the second thyristor SCR2 to turn off.
[0046] Optionally, the triggering unit can adopt a passive triggering method to automatically acquire the terminal voltages of the first thyristor SCR1 and the second thyristor SCR2. When the terminal voltages of the first thyristor SCR1 and the second thyristor SCR2 exceed a preset voltage threshold, a control signal can be issued to turn on either the first thyristor SCR1 or the second thyristor SCR2, thereby achieving the function of quickly responding to the short-circuit voltage equalization module 20.
[0047] It is conceivable that upon receiving a control signal, either the first thyristor SCR1 or the second thyristor SCR2 will conduct, shorting the first nonlinear resistor R1 and the first capacitor C1. The first nonlinear resistor R1 limits the overvoltage when the first thyristor SCR1 or the second thyristor SCR2 is turned on through its voltage-limiting characteristic. Furthermore, the first nonlinear resistor R1 operates in the low-current region under normal operating voltage and is primarily capacitive. The first capacitor C1 is used to optimize the voltage distribution of the first thyristor SCR1 or the second thyristor SCR2. The reactance L can suppress the sudden current surge at the moment the first thyristor SCR1 or the second thyristor SCR2 is turned on.
[0048] In some other possible implementations, the controllable module 10 may employ a discharge gap or a controllable semiconductor device, etc., which is not limited in the embodiments of this application.
[0049] Among them, the controllable semiconductor device can be a semi-controlled semiconductor device (such as a thyristor) or a fully controlled semiconductor device (such as an insulated gate bipolar transistor (IGBT) or an integrated gate commutated thyristor (IGCT).
[0050] In some other possible implementations, the voltage equalization module 20 includes one or more voltage equalization units 2 connected in series. For example... Figure 2 As shown in the embodiment of this application, the voltage equalization module 20 includes a plurality of voltage equalization units 2 connected in series.
[0051] The voltage equalization unit 2 includes one or more second nonlinear resistors (which can be zinc oxide resistors), and the multiple second nonlinear resistors are connected in series, parallel, or a combination of series and parallel connections. For example... Figure 2 As shown in the embodiment of this application, the voltage equalization unit 2 includes a plurality of second nonlinear resistors R2. The plurality of second nonlinear resistors R2 are connected in parallel.
[0052] Further reference Figure 2 The voltage equalization unit 2 also includes a second capacitor C2, which is connected in parallel with the second nonlinear resistor R2.
[0053] In some other possible implementations, the energy-absorbing module 30 includes one or more energy-absorbing units 3 connected in series. For example... Figure 2 As shown in the embodiment of this application, the energy absorption module 30 includes a plurality of energy absorption units 3 connected in series.
[0054] The energy absorption unit 3 includes one or more third nonlinear resistors (which can be zinc oxide resistors), and these third nonlinear resistors are connected in series, parallel, or a combination of series and parallel connections. For example... Figure 2 As shown in the embodiment of this application, the energy absorption unit 3 includes a plurality of third nonlinear resistors R3. A plurality of second nonlinear resistors R3 are connected in parallel.
[0055] For example, the number of second nonlinear resistors R2 can be less than or equal to the number of third nonlinear resistors R3, thereby achieving the controllable ratio of the actual voltage division conforming to the suppression device 100 by setting a second capacitor C2 for the voltage equalization module 20. It can be understood that the controllable ratio of the suppression device 100 is the ratio of the rated voltage of the voltage equalization module 20 to the sum of the rated voltages of the energy absorption module 30 and the voltage equalization module 20, and can be specifically set according to the actual application scenario of the suppression device 100.
[0056] This application also provides a new energy power station. For example... Figure 3 As shown, the new energy power station 10000 may include a first module 200, a second module 300, an Nth module 400, a first photovoltaic unit 500, a wind turbine 600, an Nth photovoltaic unit 700, a first step-up transformer 800 (which can be 220kV or 330kV), a second step-up transformer 900 (which can be 220kV or 330kV), and an Nth step-up transformer 1000 (which can be 220kV or 330kV).
[0057] The first module 200 and the first photovoltaic unit 500 can be connected to the 35kV Section I busbar, which is connected to the 220kV or 330kV busbar via the first step-up transformer 800. The second module 300 and the wind turbine unit 600 can be connected to the 35kV Section II busbar, which can also be connected to the 220kV or 330kV busbar via the second step-up transformer 900. The Nth module 400 and the Nth photovoltaic unit 700 can be connected to the 35kV Nth section busbar, which is connected to the 220kV or 330kV busbar via the Nth step-up transformer 1000. The 220kV or 330kV busbar is connected to the power grid S.
[0058] Optional, such as Figure 4 As shown, the first module 200, the second module 300, and the Nth module 400 include a suppression device 101, a suppression device 102, and a suppression device 103. The three suppression devices are connected in a corner-connected manner, and each can adopt the following... Figure 2 The suppression device 100 shown.
[0059] The first ends of both suppression devices 101 and 102 can be connected to the B-phase busbar. The second end of suppression device 102 and the first end of suppression device 103 can be connected to the A-phase busbar. The second ends of suppression devices 101 and 103 can be connected to the C-phase busbar. The A-phase busbar, B-phase busbar, and C-phase busbar can all be 35kV busbars.
[0060] exist Figure 3 and Figure 4Under normal operating conditions, the controllable modules in each suppression device of the 1000 renewable energy power station shown are all in the off state. The energy absorption module and the voltage equalization module share the voltage according to the designed voltage division ratio. Due to the volt-ampere characteristics of the nonlinear resistor, only a small leakage current flows through the suppression device, and the overall energy consumption of the suppression device is extremely low. When the renewable energy power station experiences a temporary overvoltage (i.e., overvoltage on the bus and / or overvoltage at the generator terminals of the renewable energy unit), the controllable module closes and short-circuits the voltage equalization module. At this time, only the energy absorption module bears the voltage, and the suppression device as a whole enters a voltage-limiting state to suppress the temporary overvoltage.
[0061] The above are merely embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application shall be included within the scope of the claims of this application pending approval.
Claims
1. A temporary overvoltage suppression device for a new energy power station, characterized in that, It includes a controllable module, an energy absorption module, and a pressure equalization module; the controllable module and the pressure equalization module are connected in parallel to form a controllable branch; the controllable branch is connected in series with the energy absorption module; The controllable module is used to: bypass the voltage equalization module when a temporary overvoltage in a new energy power station exceeds a preset voltage limit; The energy absorption module is used to: absorb the energy generated by the new energy units in the new energy power station and suppress the temporary overvoltage when the temporary overvoltage exceeds the voltage limit; The voltage equalization module is used to: when the temporary overvoltage does not exceed the voltage limit, share the temporary overvoltage with the energy absorption module and reduce the leakage current of the suppression device.
2. The suppression device according to claim 1, characterized in that, The controllable module includes one or more controllable units connected in series; The controllable unit includes a first thyristor and a second thyristor connected in antiparallel.
3. The suppression device according to claim 2, characterized in that, The controllable unit further includes a first capacitor and a first nonlinear resistor; The first capacitor, the first nonlinear resistor, the first thyristor, and the second thyristor are connected in parallel.
4. The suppression device according to claim 2, characterized in that, The controllable module also includes a reactor, which is connected in series with the controllable unit.
5. The suppression device according to claim 2, characterized in that, The controllable unit includes a triggering unit; The triggering unit, the first thyristor, and the second thyristor are connected in parallel, and the triggering unit is also connected to the control electrode of the first thyristor and the second thyristor respectively; The triggering unit is used to perform complementary control on the first thyristor and the second thyristor based on the terminal voltages of the first thyristor and the second thyristor.
6. The suppression device according to claim 1, characterized in that, The controllable module employs a discharge gap or a controllable semiconductor device.
7. The suppression device according to claim 1, characterized in that, The voltage equalization module includes one or more voltage equalization units connected in series; The voltage equalization unit includes one or more second nonlinear resistors, which are connected in series, in parallel, or in a combination of series and parallel.
8. The suppression device according to claim 7, characterized in that, The voltage equalization unit further includes a second capacitor, which is connected in parallel with the second nonlinear resistor.
9. The suppression device according to claim 7, characterized in that, The energy absorption module includes one or more energy absorption units connected in series; The energy absorption unit includes one or more third nonlinear resistors, which are connected in series, in parallel, or in a combination of series and parallel.
10. The suppression device according to claim 9, characterized in that, The number of the second nonlinear resistors is less than or equal to the number of the third nonlinear resistors.
11. A new energy power station, characterized in that, Includes the suppression device as described in any one of claims 1 to 10.