Bus voltage stabilization control device

A technology for stabilizing control device and bus voltage, applied in output power conversion devices, electrical components, single-network parallel feeding arrangements, etc., can solve problems such as reducing system efficiency, increasing circuit complexity, and unable to completely eliminate capacitive bias voltage. , to improve control efficiency, reduce the impact of grid voltage fluctuations, and stabilize photovoltaic inverter control.

CN101969274AInactive Publication Date: 2011-02-09UNIV OF ELECTRONICS SCI & TECH OF CHINA
6 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-02-09
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a bus voltage stabilization control device. Firstly, high-end bus voltage and low-end bus voltage are respectively sampled by two bus voltage sensors; then, the sampling values are respectively transferred into a high-end bus voltage controller and a low-end bus voltage controller and are compared with the expected values; when the voltage sampling values are less than theexpected voltage values of the buses, the duty ratio of pulse width modulation signals is correspondingly reduced so that the output power of a half-bridge inverter circuit is reduced, and the storedenergy of a bus capacitor is increased, thus the voltage sampling values are increased until the voltage sampling values are equal to the expected voltage values of the buses; and the reverse is alsotrue. In the invention, by controlling corresponding output current values by the high-end bus voltage controller and the low-end bus voltage controller, the regulation of the bus voltage is realizedto enable the bus voltage to be in a stabilized state. Meanwhile, because the expected voltage values (Uref) of the buses in the high-end bus voltage controller and the low-end bus voltage controllerare same, the bus voltage is stabilized, and simultaneously, the balance of the high-end voltage and the low-end voltage of the buses is also realized.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of photovoltaic inverter grid-connected power generation systems, and more specifically relates to a bus voltage stabilization control device for controlling the bus voltage of a photovoltaic inverter. Background technique

[0002] At present, the solar photovoltaic inverter power generation system has been paid attention to by many countries in the world, and the photovoltaic inverter, as a key part of the photovoltaic inverter grid-connected power generation system, has also been greatly developed. Usually, as figure 1 As shown, the photovoltaic inverter grid-connected power generation system is composed of a solar panel array 1 and a photovoltaic inverter 2 . Among them, the photovoltaic inverter 2 includes a maximum power point tracking (MPPT) module 201 , a bus circuit 202 , an inverter bridge circuit 203 and a control circuit 204 , and its function is to convert solar energy into electrical energy and...

Examples

Embodiment

[0026] figure 2 It is a functional block diagram of the bus voltage stabilization control device of the present invention.

[0027] In this example, if figure 2 As shown, the bus voltage stabilization control device 2041 is located in the control circuit 204, including two bus voltage sensors S 1 , S 2 And high and low bus voltage controller CK 1 、CK 2 .

[0028] Two busbar voltage sensors S 1 , S 2 Sampling is performed at a sampling frequency of 100Hz / N, where N is an integer greater than or equal to 1, and the sampling value of the high and low end capacitor voltage of the bus is obtained Then output to the high and low bus voltage controller CK respectively 1 、CK 2 .

[0029] High and low bus voltage controller CK 1 、CK 2 The input of is respectively the sampling value of the high and low end capacitor voltage of the bus bar The output is a pulse width modulation signal for controlling the positive and negative half-period power switches in the half-bridge...