Abstract
To achieve economical compensation for the huge-capacity negative sequence currents generated by high-speed railway load, an electromagnetic hybrid compensation system (EHCS) and control strategy is proposed. The EHCS is made up of a small-capacity railway static power conditioner (RPC) and a large-capacity magnetic static var compensator (MSVC). Compared with traditional compensation methods, the EHCS makes full use of the SVC’s advantages of economy and reliability and of RPC’s advantages of technical capability and flexibility. Based on the idea of injecting a negative sequence, the compensation principle of the EHCS is analyzed in detail. Then the minimum installation capacity of an EHCS is theoretically deduced. Furthermore, a constraint optimization compensation strategy that meets national standards, which reduces compensation capacity further, is proposed. An experimental platform based on a digital signal processor (DSP) and a programmable logic controller (PLC) is built to verify the analysis. Simulated and experimental results are given to demonstrate the effectiveness and feasibility of the proposed method.
Highlights
With its efficiency, fast speed, safety, energy-saving environmental protection and other advantages, high-speed railway obtained rapid development all over the world, especially in Asia and Europe [1].Instead of the AC-DC thyristor-based technology, highspeed electric locomotives mainly adopt the AC-DC-AC pulse-width-modulated (PWM) technology transmission
Compensation method based on thyristor controlled reactor (TCR) type static var compensator (SVC) may bring more harmonic pollution to power supply system [6]
Simulation results show that the electromagnetic hybrid compensation theory can effectively compensate the negative sequence current generated by high speed railway, and the complete and optimization compensation control strategy can limit the unbalance current of traction power supply system to the allowed range
Summary
Fast speed, safety, energy-saving environmental protection and other advantages, high-speed railway obtained rapid development all over the world, especially in Asia and Europe [1]. The first method includes: changing phase in turn, increasing the voltage level access and using the balanced transformer [4] These methods can reduce negative current, but increase the cost of transmission line and traction substation, which may not meet the relevant unbalance standards such as international standard IEC and national standard GB/T15543-2008 [5]. References [10,11,12] proposed and analyzed a novel HPQC with a proper parameter design for minimum DC operation voltage under comprehensive fundamental and harmonic compensation in co-phase power supply system. Since this system hasn’t been widely applied, more analysis in V/V transformer traction power system is needed. The contributions of this paper are the following: the minimum capacity of an EHCS is deduced in different compensation aims; cooperation control strategy
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