Suppression method for subsynchronous resonance of doubly-fed wind generating set and converter

A doubly-fed wind power generation and subsynchronous resonance technology, applied in wind power generation, electrical components, harmonic reduction devices, etc., can solve the problems of economic loss, wind turbine off-grid and crowbar circuit damage, system entry, etc., and achieve engineering realization. The effect of strong performance, safe and stable operation, and high engineering reliability

Active Publication Date: 2021-05-14
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the connection of double-fed wind farms to the power system with fixed series compensation is likely to cause a power system stability problem, that is, Sub Synchronous Resonance (SSR)
In September 2009, a wind farm SSR accident occurred in a wind farm in Texas, USA. The accident caused a large number of wind turbines to go off-grid and damage the crowbar circuit, causing huge economic losses.
[0005] The problem with this solution is that it fails to provide effective positive damping to the system, allowing the system to enter the stable region

Method used

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  • Suppression method for subsynchronous resonance of doubly-fed wind generating set and converter
  • Suppression method for subsynchronous resonance of doubly-fed wind generating set and converter
  • Suppression method for subsynchronous resonance of doubly-fed wind generating set and converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] By observing the stator current and rotor current, the subsynchronous resonance damping component is issued by the RSC.

[0045] image 3 The basic loop shown (the part shown in the box in the figure) is the control mode of power loop and current loop. The subsynchronous damping action is superimposed on the output action of the current loop to form the final action.

[0046] Among them, P ref , Q ref Respectively active power, reactive power command, P meas , Q meas are active power measurement value and reactive power measurement value respectively, i rd_ref , I rq_ref is the rotor current loop instruction, i rd_meas , I rq_meas is the measured value of the rotor current, u cd_ss , u cq_ss is the subsynchronous damping action on the dq axis, u rd , u rq Output action for dq axis. s is the fundamental component slip. u gd , u gq is the grid voltage dq axis component.

[0047] Observation and generation of subsynchronous actions, such as figure 2 shown....

Embodiment 2

[0055] By observing the stator current and rotor current, the subsynchronous resonance damping component is issued by the GSC.

[0056] Figure 5 In the middle voltage loop and current loop control mode, the subsynchronous damping action is superimposed on the output of the current loop to form the final action. u dc_ref is the DC bus voltage loop control command, U dc_meas is the measured value of DC bus voltage, i d_ref , I q_ref is the current loop dq axis command, i d_meas , I q_meas is the measured value of GSC current, u d_basic , u q_basic is the current loop output action of the basic loop, u cd_ss , u cq_ss is the last synchronous damping action on the dq axis, u d , u q The final output action for the dq axis.

[0057] The generation of the secondary synchronous action is the same as in Embodiment 1, such as figure 2 shown. The generated subsynchronous action u cd_ss , u cq_ss , superimposed on the feedforward path of the basic control loop.

[0058...

Embodiment 3

[0060] figure 2 The generated subsynchronous damping action u cd_ss , u cq_ss During the magnitude-to-phase conversion module, the Figure 7 The implementation method shown.

[0061] Subsynchronous current i md_ss i mq_ss , respectively multiplied by the amplitude adjustment coefficient k 1 and k 2 , get u d_ss_ampc with u q_ss_ampc . when k 1 and k 2 When equal, only the magnitude of the secondary synchronous action is adjusted. and k 1 and k 2 When non-equal coefficients are used, in addition to adjusting the magnitude of the subsynchronous action, it can also have a phase adjustment effect.

[0062] After amplitude adjustment, for u d_ss_ampc with u q_ss_ampc The phase shifting operation is then performed to obtain the required subsynchronous damping component.

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Abstract

The invention discloses a suppression method for subsynchronous resonance of a doubly-fed wind generating set and a converter. The method comprises the steps that stator current is_meas and rotor current i'r_meas of a doubly-fed wind power generator are obtained, a subsynchronous current component im_ss in excitation current of the doubly-fed wind power generator is calculated, subsynchronous damping action quantity uc_ss is formed through amplitude and phase transformation, and is superposed to the basic action quantity of the doubly-fed wind generating set to form a final action quantity. The subsynchronous current component is calculated in real time based on the stator current and the rotor current of the doubly-fed wind generator, compared with detection of the subsynchronous component in the power grid voltage, engineering is simpler, more convenient and more reliable, damping control over subsynchronous resonance can be achieved in a wide frequency band without accurate identification of the frequency point of subsynchronous resonance, so that the sub-synchronous resonance risk of the doubly-fed wind generating set connected to the specific power grid is eliminated, and safe and stable operation of the system after the power grid is connected is guaranteed.

Description

technical field [0001] The present application relates to the field of wind power generation, in particular to a method for suppressing subsynchronous resonance of a doubly-fed wind power generating set and a converter. Background technique [0002] Wind power is a clean and non-polluting renewable energy source, suitable for large-scale development and utilization with a relatively mature technology, and has become a mainstream energy source in some countries and regions. DFIG (Doubly-fed Induction Generator, doubly-fed wind generator) has been widely used in actual wind farms due to its advantages of variable speed and constant frequency operation, high wind energy conversion efficiency, and flexible power control. DFIG's converters include RSC (Rotor Side Convertor, machine-side converter) and GSC (Grid Side Convertor, grid-side converter). The control of RSC can realize the control of output active and reactive power of DFIG stator. The control of the GSC can keep the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02J3/01H02J3/24H02J3/38
CPCH02M1/12H02J3/01H02J3/24H02J3/38H02J2300/28Y02E10/76Y02E40/40
Inventor 周党生黄峰一
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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