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Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters

A control method, converter technology, applied in the direction of conversion equipment without intermediate conversion to AC

Active Publication Date: 2014-08-06
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a high-power bidirectional DC / DC converter high dynamic performance control method, which is used to solve the problem of high-power charge-discharge conversion or low-power range operation of the DC / DC converter. The problem of output voltage stability

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  • Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters
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  • Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters

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Embodiment Construction

[0046] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] Such as figure 1 as shown, figure 1 It is a structural diagram of the DC / DC converter system; the DC / DC converter is connected to the AC / DC inverter and the storage battery through circuit breakers QF1 and QF2 respectively. The working mode of the bidirectional DC / DC converter includes boost mode (power output) and buck mode (power input), combined with figure 1 It works as follows:

[0048] Boost mode: When the bidirectional DC / DC converter is working forward, T1 and D2 work together, and the energy from the AC / DC inverter flows to the battery, from left to right, in Buck step-down mode. When T1 is turned on, the voltage on C2 side is added to diodes D1, L1 and output capacitor C1, so D2 is cut off. At this time, the voltage applied to L is U1>U2, so the inductor current increases linearly and the energy is stored in L ...

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Abstract

The invention provides a method for controlling high-dynamic properties of high-power bidirectional DC / DC converters. The method includes steps of enabling a controller to receive constant-voltage control instructions and constant-voltage control instruction values and acquiring AD (analog-digital) sampled voltage feedback values; changing PI (proportion and integration) control parameters of outer voltage loops when low fluctuating power is outputted by a DC / DC converter and determining current instructions outputted by closed voltage loops under PI control; changing PI parameters of the outer voltage loops according to voltage difference values when the DC / DC converter is subjected to high-power charge and discharge conversion, and outputting the current instructions; changing integration items of inner current loops according to state switching directions when working modes of the DC / DC converter are switched over; transmitting PWM (pulse width modulation) driving signals according to the working modes and a duty cycle of the DC / DC converter. The method has the advantage that the method is used for solving the problem of poor stability of outputted voltages when DC / DC converters are subjected to high-power charge and discharge conversion or run in low-power ranges.

Description

technical field [0001] The invention relates to a method for direct current conversion control technology, in particular to a high dynamic performance control method for a high-power bidirectional DC / DC converter. Background technique [0002] The application of high-power bidirectional DC-DC converters in large-capacity energy storage systems can improve the capacity utilization of energy storage batteries, facilitate the modular use of energy storage batteries, meet the parallel operation of different types of batteries, and improve the operational reliability of energy storage systems. Each bidirectional DC / DC module has energy bidirectional flow control characteristics such as constant voltage, constant power, and constant current. When multiple DC / DC modules are running in parallel, the power distribution ratio can be determined by power sharing or according to the SOC and capacity of each battery, so as to achieve the consistency of system SOC and improve the optimal c...

Claims

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Application Information

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IPC IPC(8): H02M3/10
Inventor 李官军陶以彬周晨胡金杭杨波曹远志冯鑫振余豪杰王德顺俞斌桑丙玉鄢盛驰朱红保李跃龙姚梦阳吴涛
Owner STATE GRID CORP OF CHINA
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