Three-port DC power flow controller topology with fault removal capability
A DC power flow and fault removal technology, applied in the direction of DC circuits above three wires, power transmission AC networks, DC network circuit devices, etc. The problem of slow removal of the converter station, etc., achieves the effect of avoiding control difficulty and saving components
Active Publication Date: 2022-05-31
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology
[0004] On the other hand, when a DC fault occurs in the DC grid, the system damping is small, resulting in a very high rate of rise of the fault current, and the removal method of disconnecting the AC circuit breaker and blocking the converter station is slow and will cause a large-scale outage of the system
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[0040] The present invention can perform power flow control and fault removal for a plurality of DC lines in steady state and fault conditions, respectively.
[0045]
[0048]
[0055] The T-PFCCB adjusts the DC line current by the DC voltage of the MMC bridge arm, and will surely generate DC power. MMC bridge arm
[0056] P
[0059]
[0062]
[0066] 1. When the line fails, the T-PFCCB acts as follows: the initial path of the line failure is shown in Figure 5(a). Relay protection
[0067] ② When the line fails, the T-PFCCB acts as follows: the initial path of the bus failure is shown in Figure 6(a). detected
[0073] (3) When t=2.1s, a short-circuit fault occurs on the outlet bus of the converter station 1. In Figure 9(a), i
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A three-port DC power flow controller topology with fault removal capability belongs to the field of power control technology. The object of the present invention is to provide a three-port DC power flow controller topology with fault removal capability that can perform power flow control and fault removal on multiple DC lines in steady state and fault conditions respectively. This invention designs the output voltage of the bridge arm, obtains the relationship between the line current and the DC voltage, and obtains the DC voltage and AC voltage. The two are added to obtain the power flow control parameters of the T-PFCCB. The invention installs it at the DC bus, can perform power flow control and fault removal on multiple lines, saves a large number of devices, integrates the fault removal function by sharing main components, and the capacitor has a certain fault suppression capability.
Description
Technical field [0001] The invention belongs to the technical field of power control. Background technique [0002] The DC grid based on voltage source converters can realize multi-source power supply and multi-point power reception, which greatly improves the reliability and flexibility of power supply, promotes the integration of large-scale new energy power generation into the grid and is the ideal solution for long-distance power transmission in the future. and the main development direction of DC distribution network. However, in a DC power grid with N converter stations and b transmission lines, the internal power of the grid shows a natural distribution. There will be b-N+1 DC lines whose power flows cannot be independently controlled by the converter stations, and lines may appear. The overload situation has caused serious safety hazards. [0003] The DC power flow controller can assist the converter station to achieve comprehensive control of the DC grid power flo...
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IPC IPC(8): H02J1/00H02J1/08H02J3/36H02H7/26H02H7/22
CPCH02J1/00H02J1/08H02J3/36H02H7/268H02H7/267H02H7/22Y02E60/60
Inventor 李国庆边竞王振浩王鹤辛业春王朝斌成龙江守其王威儒
Owner NORTHEAST DIANLI UNIVERSITY
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