Controlled reactor-based series voltage control device of circuit
A technology of series voltage and control device, applied in circuit devices, AC network circuits, conversion equipment that can be converted to DC without intermediate conversion, etc. And other issues
Inactive Publication Date: 2011-06-29
CHONGQING UNIV
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Problems solved by technology
However, the working method of UPFC is to first convert the AC power into DC power through rectification, and then convert the DC power into the required AC power through inversion. Although the amplitude and phase of the series voltage can be effectively controlled through this process, it increases power electronics. Stress to the device, especially at high voltage and power
The increase in stress of power electronic devices in UPFC will not only greatly increase the price of UPFC, but it is also difficult to apply to high-voltage systems and ultra-high-voltage systems under current technical conditions; at the same time, because UPFC works by converting alternating current into direct current, and then convert direct current to alternating current, this process also reduces the operating efficiency of the entire power system
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[0031] Such as figure 1 As shown, the line series voltage control device based on controllable reactor includes three-phase transformer XB, and single-phase transformer XCA, XCB, XCC, controllable reactor L BA , L BB , L BC , L CA , L CB , L CC and capacitor C A 、C B 、C C A three-phase series voltage control circuit composed of;
[0032] The primary winding of the three-phase transformer XB passes through the three-phase switch K 1 (K 1A 、K 1B and K 1C ) and three-phase power supply Connected, three-phase switch K 1 (K 1A 、K 1B and K 1C ) each phase has 3 contacts, the three-phase switch K 1 (K 1A 、K 1B and K 1C ) of A-phase No. 1 contact 1A and A-phase power supply Connected, three-phase switch K 1 (K 1A 、K 1B and K 1C ) No. 1 contact 1B of B phase and B phase power supply Connected, three-phase switch K 1 (K 1A 、K 1B and K 1C ) of C-phase No. 1 contact 1C and C-phase power supply connected; three-phase switch K 1 (K 1A 、K 1B and K 1C ) ...
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The invention provides a controlled reactor-based series voltage control device of a circuit, which comprises a three-phase transformer XB, and a three-phase series voltage control circuit consisting of single-phase transformers XCA, XCB and XCC, controlled reactors LBA, LBB, LBC, LCA, LCB and LCC and capacitors CA, CB and CC. The series voltage provided for the circuit by the device can be equivalent to the supraposition of two voltage components, wherein one component is parallel to a secondary side voltage vector of the three-phase transformer XB; while the other component is vertical to acircuit current vector. In an effective control range, the series voltage control device of the circuit converts any three-phase symmetric alternating current into the alternating current which has the same frequency and has amplitude and a phase meeting requirements directly, and connects the converted alternating current into the circuit in series so as to realize discontinuous adjustment of the amplitude and the phase of the series voltage of the circuit.
Description
technical field [0001] The invention relates to an operating state control device of a power system, in particular to a device based on a controllable reactor and capable of continuously adjusting the series voltage of a line used in a high-voltage system and an ultra-high voltage system. Background technique [0002] Optimizing the operating state of the power system has an important impact on the safe, economical, and efficient operation of the power system. Effectively controlling the power flow of the line and the equivalent parameters of the line are the basis and key to optimizing the operating state of the power system. Although the parallel mode can also be used to control Line flow, such as Static Synchronous Compensator (STATCOM) in the FACTS family (Schauder, C.D. Development of a 100MVAR static condenser for voltage control of transmission system[J]IEEE Transactions on Power Delivery, Vol.10, No.3, July 1995) , but the series voltage to the line is the most effec...
Claims
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IPC IPC(8): H02M5/10H02J3/00
Inventor 江渝林泽科张志刚郑群英
Owner CHONGQING UNIV