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Improved droop control method and system based on residual electric quantity of storage battery

A technology of remaining power and control method, applied in battery circuit devices, circuit monitoring/indication, current collectors, etc., can solve the problems of poor shunt accuracy and large voltage deviation, and achieve the effect of power balance

Pending Publication Date: 2021-11-23
上海贽匠智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, when a small droop coefficient is selected, the voltage deviation is small, but the corresponding shunt accuracy is poor
When a larger droop coefficient is selected, the voltage deviation is larger

Method used

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  • Improved droop control method and system based on residual electric quantity of storage battery
  • Improved droop control method and system based on residual electric quantity of storage battery
  • Improved droop control method and system based on residual electric quantity of storage battery

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Embodiment 1

[0049] According to an improved droop control method based on the remaining power of the battery provided by the present invention, it includes:

[0050] Step S1: Detect the converter output voltage u dc1 and output current i dc1 , and according to the output voltage u dc1 and output current i dc1 Get the converter output power p dc1 ;

[0051]Step S2: Detect the value Soc of the remaining capacity of the battery 1 , according to the converter output power and the calculation formula of the droop method, a new reference voltage u is obtained dcref ;

[0052] Step S3: Actual output voltage u dc1 with the new reference voltage u dcref For comparison, the reference value of the current is obtained through the voltage control loop;

[0053] Step S4: current reference value and actual output current i dc1 For comparison, the converter switch PWM drive waveform is obtained through the current control loop;

[0054] Step S5: Control the voltage of the converter through the...

Embodiment 2

[0078] Embodiment 2 is a preferred example of embodiment 1

[0079] In the adjustment of the drooping control coefficient, the present invention introduces the remaining capacity of the battery. According to the relationship between the remaining capacity of the battery and the output power, the battery with a larger initial residual capacity should output a higher load power at the beginning, and the battery with a smaller initial residual capacity should initially output a higher load power. Output lower load power to achieve power balance.

[0080] According to the power of the converter and the state of the remaining capacity of the battery, the battery with a higher state of charge will output higher power, and the capacity will drop faster, and the corresponding remaining capacity will be introduced into the droop coefficient, and the droop coefficient will be dynamically corrected, so as to realize different The balance between the battery packs with remaining capacity,...

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Abstract

The invention provides an improved droop control method and system based on the residual electric quantity of a storage battery, and the method comprises the steps: S1, detecting the output voltage udc1 and the output current idc1 of a converter, and obtaining the output power pdc1 of the converter according to the output voltage udc1 and the output current idc1; S2, detecting the value Soc1 of the residual capacity of the storage battery, and obtaining a new reference voltage udcref according to the output power of the converter and a droop method calculation formula; S3, comparing the actual output voltage udc1 with a new reference voltage udcref, and obtaining a current reference value through a voltage control loop; S4, comparing the current reference value with the actual output current idc1, and obtaining a converter switch PWM driving waveform through a current control ring; S5, controlling the voltage of the converter through the PWM driving waveform to control the output power of the storage battery.

Description

technical field [0001] The present invention relates to the field of industrial technology, in particular, to an improved droop control method and system based on the remaining power of a battery, and more specifically, to an improved droop control strategy based on the remaining power of a battery. Background technique [0002] At present, droop control is widely used in microgrid operation. The proportional relationship between the output current of the converter and the cable impedance and output impedance is used to control the voltage on the bus, so that the bus voltage can fluctuate within a certain range. Since the cable impedance cannot be ignored in the actual operation process, when the cable impedance is considered, the voltage of each distributed generation unit is not exactly the same, resulting in a decrease in shunt accuracy. Therefore, it is necessary to improve the droop control so as to ensure a certain shunt accuracy and a small voltage deviation. [0003...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J7/00
CPCH02J3/32H02J7/0048H02J7/0063H02J7/00712
Inventor 王洪荣孙强施成章王乐刘志峰
Owner 上海贽匠智能科技有限公司
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