Coupling inductance type bidirectional DC current limiter with DC power distribution network grounding bypass function
A technology of DC distribution network and coupled inductance, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the hidden dangers of safe operation of DC converter stations in DC systems, Low inertia, low impedance, etc.
Pending Publication Date: 2022-04-15
国网内蒙古东部电力有限公司通辽供电公司 +3
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Problems solved by technology
Due to the low inertia and low impedance of the DC grid composed of power electronic devices, the fault develops rapidly, so the fault current will reach the insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT) and related power electronic devices within a few milliseconds. The upper limit of working tolerance has caused huge hidden dangers to the safe operation of the DC system, especially the DC converter station
Moreover, the DC system current has no zero-crossing point, which brings new challenges to the efficient suppression of fault current
Method used
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Embodiment Construction
[0030] The steps of the present invention are:
[0031] Step 1: Design GBCIB-FCL topology;
[0032] Step 2: Design the "Normal-Premark Flow-Current Flow-Disconnect Bypass" in the GBCIB-FCL Topology;
[0033] Step 3: Establish a mathematical model of the GBCIB-FCL topology limit process;
[0034] Step 4: Give the main parameter selection method of GBCIB-FCL.
[0035] GBCIB-FCL topology figure 1 As shown, GBCIB-FCL consists of a main flow portion and a current limiting portion. Main flow part (branch) by fast mechanical switch BRK FCL Component in series with load transfer switch (LCS), which is low, and there is low power transmission for maintaining the normal operation of the system. When the system is short-circuited, the transfer of short-circuit currents implemented by the current streaming portion is composed of a secondary branch, a current limiting branch, and bypass branch. The auxiliary branch is parallel IGBT solid state switch S FCL Used to match the transfer of the mai...
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The invention discloses a coupling inductance type bidirectional direct-current limiter with a direct-current power distribution network grounding bypass function, and belongs to the field of direct-current power transmission protection equipment. The invention aims to design a coupling inductance type bidirectional direct current limiter which aims to realize a function of efficiently inhibiting a grounding bypass of a direct current power distribution network by direct current fault current. The method comprises the following steps of: designing the topology of the GBCIB-FCL, designing four working states of the topology of the GBCIB-FCL, establishing a model of a topology current limiting process of the GBCIB-FCL, and providing a main parameter selection method of the GBCIB-FCL. The coupling inductance type bidirectional direct current limiter with the grounding bypass function is scientific, reasonable, high in applicability, high in reliability and good in effect.
Description
Technical field [0001] The present invention belongs to the field of DC transmission protection equipment. Background technique [0002] With the exacerbation of energy shortages and environmental deterioration, energy development and utilization gradually transition from traditional energy to renewable energy. DC grids with flexible DC transmission technology are a significant means of renewable energy grid and gas. The DC grid networking network is the mainstream form, but it also brings more risk of failure for the DC grid. Since the DC power grid composed of power electronics has low inertia, the characteristics of impedance have caused rapid development of the fault, so the fault current will reach the insulated gate bipolar transistor (IGBT) and related power electronic devices within several milliseconds. Work tolerance, the safe operation of DC systems, especially DC shift stations, cause huge hidden dangers. Moreover, the DC system current does not have a zero point, bri...
Claims
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IPC IPC(8): H02H9/02H02H7/26
Inventor 李赫袁梦瑶王尉曹志刚王宸丁仁杰王振浩
Owner 国网内蒙古东部电力有限公司通辽供电公司