Comprehensive compensation instruction current obtaining method of angle-shaped chain-type SVG (static var generator) of power distribution network
A technology of comprehensive compensation and command current, applied in reactive power adjustment/elimination/compensation, flexible AC transmission system, AC network to reduce harmonics/ripples, etc., can solve problems such as reactive power, negative sequence and harmonics , to achieve the effect of easy engineering realization and simple calculation
Active Publication Date: 2013-09-18
HUNAN UNIV
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[0004] The technical problem to be solved by the present invention is to provide a distribution network angular chain SVG comprehensive compensation command current acquisition method to solve the problems caused by reactive power, negative sequence and harmonics in the medium and high voltage distribution network. F
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[0023] Such as figure 1 As shown, the angular chain SVG is connected to the three-phase three-wire distribution network to compensate the reactive power, negative sequence and harmonic current caused by the nonlinear load. The angle chain SVG is a three-phase delta connection structure. Each phase of the angle chain SVG is composed of multiple H-bridges cascaded. The H bridge includes a single-phase bridge converter and a DC side capacitor connected in parallel with the single-phase bridge converter. The H-bridge includes a single-phase bridge converter and a DC side capacitor. load current i la i lb i lc Including active power, reactive power, negative sequence and harmonic current, among which reactive power, negative sequence and harmonic current are injected into the grid, causing power loss of the grid and threatening the stable operation of the system. Angular chain SVG line current i a i b i c It has the same amplitude and opposite direction as the reactive power...
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The invention discloses an comprehensive compensation instruction current obtaining method of an angle-shaped chain-type SVG of a power distribution network. The method comprises the following steps of detecting load currents of ila, ilb and ilc; obtaining load current fundamental active components through ip-iq conversion based on an instantaneous reactive power theory and LPF (lowpass filtering); subtracting the load current fundamental active components from the load current and negating the calculation result to obtain line current compensation instruction signal load currents ia*, ib*, ic* which contain fundamental reactive components, fundamental negative sequence components and reactive components; performing matrix transformation and LPF on the line current compensation instruction signal load currents to obtain a fundamental negative sequence active component and a fundamental negative sequence negative component; and multiplying the fundamental negative sequence active component and the fundamental negative sequence negative component with cos (omega t) and sin (omega t) respectively to obtain a zero sequence loop current instruction i0*, and combining the line current compensation instruction with the zero sequence loop current instruction to obtain an angle-shaped chain-type SVG phase current instruction iab*, ibc* and ica*. The comprehensive compensation instruction current obtaining method of the angle-shaped chain-type SVG of the power distribution networkload current instantaneous value takes load current instantaneous value to achieve simple calculation and can be effectively combined with an existing single-phase chain-type SVG control strategy to achieve an angle-shaped chain-type SVG comprehensive compensation function.
Description
technical field [0001] The invention relates to a method for acquiring command current of an angular chain type SVG comprehensive compensation in a distribution network. Background technique [0002] There are nonlinear loads in the distribution network, which generate a large amount of reactive power, negative sequence and harmonic currents, which cause power loss in the power system and threaten the safe operation of the system. In order to eliminate the impact of nonlinear loads on the power grid, many scholars have conducted research on the power quality control of medium and high voltage distribution networks. According to the difference of compensation current, it can be divided into: grid reactive current compensation, fundamental wave negative sequence current compensation and harmonic current compensation. The usual distribution network power quality control device only performs reactive power compensation or harmonic control on the power grid, and the device has a...
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Login to view more IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/10Y02E40/40
Inventor 罗安何志兴熊桥坡马伏军黎小聪刘月华
Owner HUNAN UNIV
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