| 引用本文: | 吴凤江,孙秀冬,孙力,赵克.无交流电压传感器并网逆变器的控制策略及其改进[J].电力自动化设备,2009,(7): |
| .Control strategy of grid-connected converter without AC voltage sensor and its improvement[J].Electric Power Automation Equipment,2009,(7): |
|
|
| 摘要: |
| 将基于虚拟磁链的直接功率控制策略用于并网逆变器的控制.详细推导了虚拟磁链与瞬时功率的表达式,在无需检测网侧交流电压的前提下即可获得并网功率的瞬时值,进而取消了交流电压传感器.通过对并网功率的有功和无功成分进行直接独立控制,省去了旋转坐标变换以及电流闭环控制等复杂算法.采用带有饱和限幅反馈环节的积分器代替不定积分器进行虚拟磁链观测,解决了因传统观测方法存在功率计算偏差而造成系统效率降低、动态响应性能较差等问题.对所提出的改进观测方法及基于改进虚拟磁链直接功率控制策略的并网逆变器进行仿真和实验,结果证明了所提方法的正确性和可行性. |
| 关键词: 并网逆变器 直接功率控制 虚拟磁链 积分器 改进 |
| DOI： |
| 分类号:TM464 |
| 基金项目:国家自然科学基金资助项目? |
|
| Control strategy of grid-connected converter without AC voltage sensor and its improvement |
|
WU Fengjiang1 2 SUN Xiudong1 SUN Li2 ZHAO Ke2
|
| Abstract: |
| The DPC(Direct Power Control) strategy based on VF(Virtual Flux-linkage) is applied to grid-connected converter.The functions between VF and instantaneous power are derived.As the instantaneous powers can be obtained without grid-side voltage detection,the AC voltage sensors are avoided.By independent controlling the active and reactive components of parallel-in power,the complex algorithms,including the rotation coordinates conversion and the closed-loop current control,are abbreviated.Instead of the pure ... |
| Key words: grid-connected converter direct power control virtual flux-linkage integrator improvement |
