Asymmetric cascade multi-level hybrid energy storage control method

A cascaded multi-level, hybrid energy storage technology, applied in the field of power electronics, can solve the problems of the capacity loss of the energy storage system, the distribution of the reactive power of the chain links is not considered, and the continuous adjustment of the active and reactive power of the system cannot be realized. , to reduce the harmonics of grid-connected current and prevent over-modulation

Active Publication Date: 2019-02-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0002] Modularization is a major feature of the cascaded multilevel circuit. When the energy storage battery fails in the cascaded multilevel circuit, the energy storage battery is removed by bypassing the link unit to form a battery based on the energy storage battery and capacitor. Asymmetric cascaded multi-level energy storage system can ensure the normal operation of the system, but it will cause the loss of energy storage system capacity
For grid-connected asymmetric cascaded multi-level circuits, energy storage batteries and supercapacitors are used as the DC power supply of link units, and feedforward space vector modulation technology is used to rea

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Embodiment 1

[0033] In order to verify the effectiveness of the present invention, an experimental simulation model is set up in Matlab. The system parameters are as follows: DC side voltage of the battery link is 11745V, filter inductance is 62mH, capacitor link capacitance is 160μF, and the capacitor voltage reference value is 23490V; grid side voltage frequency is 50Hz, The effective value is 35kV, the phase is 0; given the grid-connected current frequency of 50Hz, the effective value of 70.7A, and the phase of 1.55rad, the scheme of the present invention is used to simulate the situation of outputting active power and inductive reactive power.

[0034] Simulation results such as Figure 5 , Figure 6 As shown, the peak value of the grid-connected current is 101A, corresponding to the effective value of 70.4A, and the amplitude and phase can track the given value; the capacitor voltage is in the range of 2.3-2.4kV, and oscillates with equal amplitude near the given value. The simulation ...

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Abstract

The invention discloses an asymmetric cascade multi-level hybrid energy storage control method, and is suitable for phase splitting control of a single-phase cascade multi-level energy storage systemand a three-phase asymmetric cascade multi-level energy storage system. The method comprises the following steps of performing closed-loop control on a grid-connected current and a capacitor voltage,and determining an output voltage reference vector and a correction vector; determining a stable working range of the system according to the output voltage vector of the system, and by combining an inductor voltage, determining a steady-state working point; according to the steady-state working point, the output voltage reference vector and the correction vector, determining a battery link outputvoltage reference vector and a capacitor link output voltage reference vector; and determining a modulation wave according to the battery link output voltage reference vector and the capacitor link output voltage reference vector, generating a switch signal through SPWM, and driving an inverter to work. By virtue of the method, it can be guaranteed that the system can still operate stably in fourquadrants when a part of battery link breaks down, the control precision of the grid-connected current is improved, and the harmonic of the grid-connected current is reduced.

Description

technical field [0001] The invention relates to power electronics technology, in particular to an asymmetric cascaded multi-level hybrid energy storage control method. Background technique [0002] Modularization is a major feature of the cascaded multilevel circuit. When the energy storage battery fails in the cascaded multilevel circuit, the energy storage battery is removed by bypassing the link unit to form a battery based on the energy storage battery and capacitor. The asymmetric cascaded multi-level energy storage system can ensure the normal operation of the system, but it will cause the loss of the capacity of the energy storage system. For grid-connected asymmetric cascaded multi-level circuits, energy storage batteries and supercapacitors are used as the DC power supply of link units, and feedforward space vector modulation technology is used to realize the direct active power distribution of energy storage batteries and supercapacitors, but not It can realize th...

Claims

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Application Information

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IPC IPC(8): H02J15/00H02J7/34H02J3/00
CPCH02J3/00H02J7/345H02J15/00
Inventor 张越刘钊龚建
Owner NANJING UNIV OF SCI & TECH
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