DC distribution system energy storage device adaptive virtual impedance droop control method

A technology of DC power distribution and virtual impedance, applied in the fields of power electronics, DC power distribution, energy storage control system and power quality, it can solve the current circulation, without considering the coupling effect of resistance and reactance, and the output power of the energy storage converter is not equal. equalization problem

CN105305410AActive Publication Date: 2016-02-03SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-02-03

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Abstract

The invention relates to a DC distribution system energy storage device adaptive virtual impedance droop control method, which is applied to multi-converter parallel control in a DC distribution system. The method comprises the steps of 1) acquiring electric power parameters of the DC distribution system, establishing a double closed-loop controller which consists a voltage outer loop and a capacitive current inner loop, and establishing a DC distribution system droop control model; 2) introducing virtual impedance ZD(s) into a part between converter output current and converter reference voltage signals of the double closed-loop controller in the DC distribution system droop control model so as to act as negative feedback, and acquiring equivalent output impedance Zov(s); and 3) enabling the equivalent output impedances Zov(s) corresponding to a plurality of lines to be equal through setting values of different virtual impedances ZD(s), and thus averaging output power and power distribution of the plurality of lines in the DC distribution system. Compared with the prior art, the method provided by the invention has the advantages of shock suppression, simple algorithm, low cost and the like.
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Description

technical field

[0001] The invention relates to the fields of power electronics, DC power distribution, energy storage control systems and power quality, in particular to an adaptive virtual impedance droop control method for an energy storage device of a DC power distribution system. Background technique

[0002] The DC power distribution system integrates various new energy power generation systems, and then connects to the DC power distribution system with a unified interface. Such a networking form can weaken the adverse effects caused by the randomness and intermittent nature of distributed power, and better accept renewable energy. However, in order to stabilize the volatility of distributed energy such as wind power and photovoltaics, it is necessary to increase the energy storage system to maintain the stable operation of the DC power distribution system.

[0003] Energy storage converters mostly adopt droop control strategies, and the converters of each energy stor...

Examples

Embodiment

[0039] The adaptive virtual impedance control strategy of this patent is applied to the parallel control of multiple converters in the energy storage system. Multiple energy storage devices operate in parallel through converters. Taking two energy storage converters in parallel as an example, the control schematic diagram is as follows figure 1 shown. DG1 and DG2 are two energy storage devices, the interface device is a PWM converter based on IGBT, and the filter is LC type. to the converter output voltage V o , output current I o and capacitive current I C Sampling is carried out, and the sampling results are sent to the DSP control board. The DSP outputs the IGBT switch signal through the control algorithm, and controls the on-off of the IGBT through the drive amplification to realize the control of the output voltage. The energy storage devices DG1 and DG2 are connected to the PCC point of the common bus through line 1 and line 2 respectively, and the impedance Z of lin...