{"id":62062,"date":"2026-01-19T08:41:50","date_gmt":"2026-01-19T00:41:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/62062.html"},"modified":"2026-01-19T08:41:50","modified_gmt":"2026-01-19T00:41:50","slug":"%e3%80%8a%e5%be%81%e6%9c%8d%e7%9b%b8%e4%bd%8d%e5%b7%ae%ef%bc%9a%e5%9f%ba%e4%ba%8efft%e6%a0%87%e5%ae%9a%e4%b8%8e%e6%95%b0%e5%ad%97%e8%a1%a5%e5%81%bf%e7%9a%84%e9%ab%98%e7%b2%be%e5%ba%a6%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/62062.html","title":{"rendered":"\u300a\u5f81\u670d\u76f8\u4f4d\u5dee\uff1a\u57fa\u4e8eFFT\u6807\u5b9a\u4e0e\u6570\u5b57\u8865\u507f\u7684\u9ad8\u7cbe\u5ea6\u8ba1\u91cf\u5b9e\u73b0\u300b"},"content":{"rendered":"

\u5f15\u8a00：\u4ece\u95ee\u9898\u5230\u89e3\u51b3\u65b9\u6848\u7684\u8de8\u8d8a<\/h3>\n

\u5728\u4e0a\u4e00\u7bc7\u7684\u63a2\u7d22\u4e2d，\u6211\u4eec\u63ed\u793a\u4e86\u7406\u60f3\u529f\u7387\u6a21\u578b\u7684\u8106\u5f31\u6027：\u9762\u5bf9\u4e00\u4e2a\u7b80\u5355\u7684\u53f0\u5f0f\u98ce\u6247（\u611f\u6027\u8d1f\u8f7d），\u57fa\u4e8e P = U\u1d63\u2098\u209b \u00d7 I\u1d63\u2098\u209b \u7684\u8ba1\u7b97\u7ed3\u679c\u7adf\u663e\u8457\u504f\u79bb\u771f\u5b9e\u503c\u3002\u6211\u4eec\u8ba4\u8bc6\u5230，\u5176\u6839\u6e90\u5728\u4e8e\u7535\u538b\u4e0e\u7535\u6d41\u6ce2\u5f62\u4e4b\u95f4\u5b58\u5728\u7684\u76f8\u4f4d\u5dee（\u03c6）\u3002<\/p>\n

\u7136\u800c，\u66f4\u6df1\u5165\u7684\u5256\u6790\u5e26\u6765\u4e86\u66f4\u4e25\u5cfb\u7684\u6311\u6218：\u6211\u4eec\u901a\u8fc7ADC\u91c7\u6837\u76f4\u63a5\u83b7\u5f97\u7684"\u76f8\u4f4d\u5dee"，\u5e76\u975e\u8d1f\u8f7d\u7279\u6027\u7684\u7eaf\u51c0\u53cd\u6620，\u800c\u662f\u4e00\u4e2a\u7531\u8d1f\u8f7d\u771f\u5b9e\u76f8\u79fb（\u03c6_load）\u00a0\u4e0e\u6d4b\u91cf\u7cfb\u7edf\u56fa\u6709\u8bef\u5dee（\u03c6_system）\u00a0\u53e0\u52a0\u800c\u6210\u7684\u6df7\u5408\u4fe1\u53f7：<\/p>\n

\"\"<\/p>\n

\u82e5\u4e0d\u80fd\u5c06\u4e8c\u8005\u7cbe\u786e\u5206\u79bb，\u4efb\u4f55\u7cbe\u5bc6\u6d4b\u91cf\u90fd\u65e0\u4ece\u8c08\u8d77\u3002\u8fd9\u5f15\u51fa\u4e86\u4e24\u4e2a\u6838\u5fc3\u95ee\u9898：<\/p>\n

  • \n

    \u5982\u4f55\u7cbe\u786e\u6355\u83b7\u7535\u538b\u4e0e\u7535\u6d41\u4e4b\u95f4\u7684\u539f\u59cb\u76f8\u4f4d\u5dee \u03c6_raw？<\/p>\n<\/li>\n

  • \n

    \u5982\u4f55\u5206\u79bb\u5e76\u8865\u507f\u7cfb\u7edf\u56fa\u6709\u8bef\u5dee \u03c6_system，\u63d0\u53d6\u771f\u5b9e\u7684\u8d1f\u8f7d\u76f8\u79fb \u03c6_load？<\/p>\n<\/li>\n

    \u672c\u7ae0\u5c06\u7cfb\u7edf\u6027\u5730\u89e3\u7b54\u8fd9\u4e9b\u95ee\u9898\u3002\u6211\u4eec\u5c06\u4ee5\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362（FFT）\u00a0\u4e3a\u6838\u5fc3\u5de5\u5177，\u6784\u5efa\u4e00\u5957\u4ece"\u6807\u5b9a"\u5230"\u8865\u507f"\u7684\u5b8c\u6574\u6570\u5b57\u5904\u7406\u94fe\u8def，\u5b9e\u73b0\u4ece\u5608\u6742\u7684\u73b0\u5b9e\u6570\u636e\u4e2d\u63d0\u53d6\u51fa\u771f\u5b9e\u7684\u7535\u6c14\u53c2\u6570，\u5b8c\u6210\u9ad8\u7cbe\u5ea6\u8ba1\u91cf\u7684\u6700\u7ec8\u8de8\u8d8a\u3002<\/p>\n

    \u4e00\u3001\u76f8\u4f4d\u5dee\u7684\u7cbe\u786e\u6355\u83b7：FFT\u9891\u8c31\u5206\u6790\u6cd5<\/h3>\n

    \u8981\u5728\u6570\u5b57\u57df\u6355\u83b7\u76f8\u4f4d\u5dee，\u9700\u5c06\u65f6\u95f4\u4e0a\u7684\u6ce2\u5f62\u504f\u79fb\u8f6c\u5316\u4e3a\u53ef\u8ba1\u7b97\u7684\u76f8\u4f4d\u89d2\u5ea6\u3002FFT\u65b9\u6cd5\u56e0\u5176\u7cbe\u5ea6\u548c\u9891\u57df\u6d1e\u5bdf\u529b\u6210\u4e3a\u9996\u9009\u3002<\/p>\n

    1.1 \u6838\u5fc3\u539f\u7406：\u4ece\u65f6\u57df\u5230\u9891\u57df\u7684\u6620\u5c04<\/h4>\n

    FFT\u5c06\u65f6\u57df\u4fe1\u53f7\u5206\u89e3\u4e3a\u4e00\u7cfb\u5217\u590d\u6570\u9891\u7387\u5206\u91cf\u3002\u5bf9\u4e8e\u7ecf\u540c\u6b65\u91c7\u6837\u83b7\u5f97\u7684\u7535\u538b\u5e8f\u5217\u00a0u[n] \u548c\u7535\u6d41\u5e8f\u5217\u00a0Iraw[n]，\u5206\u522b\u8fdb\u884cFFT\u540e，\u53ef\u5f97\u5230\u5404\u81ea\u7684\u590d\u6570\u8868\u793a：<\/p>\n

    \"\"<\/p>\n<\/p>\n

    \u5219\u539f\u59cb\u76f8\u4f4d\u5dee\u53ef\u76f4\u63a5\u8ba1\u7b97\u4e3a：<\/p>\n

    \"\"<\/p>\n<\/p>\n

    1.2 \u5173\u952e\u5b9e\u73b0\u6b65\u9aa4<\/h4>\n
  • \n

    \u540c\u6b65\u91c7\u6837：\u4f7f\u7528\u53cc\u901a\u9053ADC\u6216\u4e25\u683c\u540c\u6b65\u7684\u91c7\u6837\u65f6\u949f，\u786e\u4fdd\u7535\u538b\u548c\u7535\u6d41\u91c7\u6837\u7684\u65f6\u95f4\u4e00\u81f4\u6027\u3002<\/p>\n<\/li>\n

  • \n

    \u6574\u5468\u671f\u622a\u65ad：\u91c7\u96c6\u6574\u6570\u4e2a\u4fe1\u53f7\u5468\u671f，\u51cf\u5c11\u9891\u8c31\u6cc4\u9732\u5bf9\u76f8\u4f4d\u7cbe\u5ea6\u7684\u5f71\u54cd\u3002<\/p>\n<\/li>\n

  • \n

    \u57fa\u9891\u5206\u91cf\u63d0\u53d6：\u5728FFT\u7ed3\u679c\u4e2d，\u5b9a\u4f4d\u7535\u7f51\u57fa\u9891（\u598250Hz\/60Hz）\u5bf9\u5e94\u7684\u9891\u70b9，\u8be5\u70b9\u7684\u76f8\u4f4d\u4fe1\u606f\u6700\u4e3a\u51c6\u786e\u3002<\/p>\n<\/li>\n

    \u4e8c\u3001\u7cfb\u7edf\u56fa\u6709\u8bef\u5dee\u7684\u6807\u5b9a：\u5bfb\u627e"\u96f6\u4f4d"\u57fa\u51c6<\/h3>\n

    \u5206\u79bb \u03c6_system \u7684\u5173\u952e\u5728\u4e8e\u5efa\u7acb\u4e00\u4e2a\u5df2\u77e5 \u03c6_load = 0 \u7684\u53c2\u8003\u72b6\u6001，\u6b64\u65f6\u6d4b\u91cf\u51fa\u7684 \u03c6_raw \u5373\u4e3a \u03c6_system\u3002<\/p>\n

    2.1 \u6807\u5b9a\u6d41\u7a0b<\/h4>\n
  • \n

    \u8fde\u63a5\u6807\u51c6\u8d1f\u8f7d：\u53ef\u4ee5\u4f7f\u7528\u6807\u51c6\u6e90，\u6ca1\u6709\u7684\u8bdd\u4f7f\u7528\u4e00\u4e2a\u65e0\u611f\u578b\u7eaf\u7535\u963b\u8d1f\u8f7d，\u5176\u963b\u503c\u5e94\u5728\u6d4b\u91cf\u7cfb\u7edf\u91cf\u7a0b\u5185，\u786e\u4fdd\u4fe1\u53f7\u5e45\u5ea6\u5408\u9002\u3002<\/p>\n<\/li>\n

  • \n

    \u91c7\u96c6\u4e0e\u8ba1\u7b97：\u5728\u8be5\u72b6\u6001\u4e0b\u91c7\u96c6\u8db3\u591f\u5468\u671f\u7684\u7535\u538b\u548c\u7535\u6d41\u6ce2\u5f62，\u8ba1\u7b97\u539f\u59cb\u76f8\u4f4d\u5dee \u03c6_raw\u3002<\/p>\n<\/li>\n

  • \n

    \u8f6c\u6362\u4e3a\u65f6\u5ef6：\u5c06\u76f8\u4f4d\u5dee\u8f6c\u6362\u4e3a\u7cfb\u7edf\u56fa\u6709\u5ef6\u65f6 \u03c4：<\/p>\n

    \"\"<\/p>\n<\/li>\n

  • \n

    \u591a\u6b21\u5e73\u5747：\u91cd\u590d\u591a\u6b21\u6d4b\u91cf\u53d6\u5e73\u5747\u503c，\u63d0\u9ad8\u6807\u5b9a\u7cbe\u5ea6\u3002<\/p>\n<\/li>\n

    \u4e09\u3001\u6570\u5b57\u8865\u507f\u7684\u6838\u5fc3：\u9891\u57df\u65cb\u8f6c\u6cd5<\/h3>\n

    \u83b7\u5f97\u7cfb\u7edf\u5ef6\u65f6\u00a0\u03c4\u00a0\u540e，\u8865\u507f\u7684\u76ee\u6807\u662f：\u5728\u6570\u5b57\u57df\u62b5\u6d88\u8fd9\u4e2a\u56fa\u5b9a\u5ef6\u65f6\u7684\u5f71\u54cd\u3002\u76f4\u63a5\u5728\u65f6\u57df\u5bf9\u91c7\u6837\u5e8f\u5217\u8fdb\u884c\u79fb\u4f4d\u548c\u63d2\u503c\u4e0d\u4ec5\u8ba1\u7b97\u590d\u6742，\u4e14\u4f1a\u5f15\u5165\u65b0\u7684\u8bef\u5dee\u3002\u4e00\u79cd\u5728\u6570\u5b66\u4e0a\u4e25\u683c\u7b49\u4ef7\u3001\u5728\u5de5\u7a0b\u4e0a\u66f4\u4f18\u96c5\u7684\u65b9\u6cd5\u662f\u9891\u57df\u65cb\u8f6c\u8865\u507f\u6cd5\u3002<\/p>\n

    3.1 \u7406\u8bba\u57fa\u7840：\u65f6\u5ef6\u7684\u9891\u57df\u7b49\u4ef7\u64cd\u4f5c<\/h4>\n

    \u4fe1\u53f7\u5904\u7406\u4e2d\u7684\u65f6\u79fb\u5b9a\u7406\u6307\u51fa：\u65f6\u57df\u4e0a\u7684\u4e00\u4e2a\u56fa\u5b9a\u5ef6\u65f6\u00a0\u03c4，\u5b8c\u5168\u7b49\u4ef7\u4e8e\u5728\u9891\u57df\u4e58\u4ee5\u4e00\u4e2a\u590d\u6570\u65cb\u8f6c\u56e0\u5b50\"\"（\u5176\u4e2d\u00a0\u03c9 = 2\u03c0f）\u3002<\/p>\n

    \u5bf9\u4e8e\u6211\u4eec\u7684\u7cfb\u7edf，ADC\u91c7\u6837\u5230\u7684\u7535\u6d41\u4fe1\u53f7\u00a0isampled(t)\u53ef\u8868\u793a\u4e3a\u771f\u5b9e\u7535\u6d41\u00a0i(t)\u7684\u5ef6\u65f6\u7248\u672c：<\/p>\n

    \"\"<\/p>\n

    \u5176\u9891\u8c31\u5173\u7cfb\u4e3a：<\/p>\n

    \"\"<\/p>\n

    \u8fd9\u4e2a\u65cb\u8f6c\u56e0\u5b50\u53ea\u6539\u53d8\u590d\u9891\u8c31\u7684\u76f8\u4f4d\u89d2，\u800c\u4e0d\u6539\u53d8\u5176\u5e45\u5ea6\u3002\u5b83\u5728\u6bcf\u4e2a\u9891\u7387\u70b9 f \u4e0a，\u90fd\u5c06\u771f\u5b9e\u7535\u6d41\u7684\u76f8\u4f4d\u5411\u540e\u65cb\u8f6c\u4e86 2\u03c0f\u03c4 \u5f27\u5ea6\u3002<\/p>\n

    3.2 \u8865\u507f\u64cd\u4f5c：\u5728FFT\u57df\u5185\u9006\u8f6c\u65cb\u8f6c<\/h4>\n

    \u65e2\u7136\u7cfb\u7edf\u8bef\u5dee\u662f\u5728\u9891\u57df\u4e0a\u505a\u4e86"\u51cf\u6cd5\u65cb\u8f6c"，\u90a3\u4e48\u8865\u507f\u5c31\u662f\u5bf9\u5176\u505a"\u52a0\u6cd5\u65cb\u8f6c"\u3002\u6211\u4eec\u901a\u8fc7\u590d\u6570\u4e58\u6cd5，\u5bf9\u7535\u6d41\u9891\u8c31\u8fdb\u884c\u8865\u507f：<\/p>\n

    \"\"<\/p>\n

    \u8865\u507f\u540e\u7684\u9891\u8c31\u00a0Icompensated(f)，\u5176\u76f8\u4f4d\u5df2\u4e0e\u771f\u5b9e\u7535\u6d41\u00a0I(f) \u7684\u76f8\u4f4d\u5b8c\u5168\u76f8\u540c\u3002<\/p>\n

    3.3 \u5b8c\u6574\u7b97\u6cd5\u6d41\u7a0b：\u4ece\u8865\u507f\u5230\u6ce2\u5f62\u91cd\u5efa<\/h4>\n

    \u8be5\u65b9\u6cd5\u7684\u5f3a\u5927\u4e4b\u5904\u5728\u4e8e，\u5b83\u4e0d\u4ec5\u80fd\u4fee\u6b63\u76f8\u4f4d\u7528\u4e8e\u8ba1\u7b97，\u66f4\u80fd\u91cd\u5efa\u51fa\u5728\u65f6\u57df\u4e0a\u4e0e\u7535\u538b\u4e25\u683c\u5bf9\u9f50\u7684\u7535\u6d41\u6ce2\u5f62，\u4e3a\u6240\u6709\u540e\u7eed\u5206\u6790\u63d0\u4f9b\u7eaf\u51c0\u6570\u636e\u6e90\u3002\u5176\u5b8c\u6574\u7684\u6570\u636e\u5904\u7406\u94fe\u5982\u4e0b：<\/p>\n

    \"\"<\/p>\n

    3.4 STM32\u5b9e\u73b0\u5173\u952e\u4ee3\u7801（\u57fa\u4e8eCMSIS-DSP\u5e93）<\/h4>\n

    \/**
    \n * \u529f\u7387\u5206\u6790\u5668\u6838\u5fc3\u6570\u636e\u7ed3\u6784
    \n * \u6ce8：\u4e3a\u7b80\u6d01\u8d77\u89c1，\u7701\u7565\u90e8\u5206\u8f85\u52a9\u6210\u5458
    \n *\/
    \ntypedef struct {
    \n \/\/ \u6838\u5fc3\u914d\u7f6e
    \n uint32_t fft_size; \/\/ FFT\u70b9\u6570（2\u7684\u5e42）
    \n float32_t sampling_freq; \/\/ \u91c7\u6837\u9891\u7387<\/p>\n

    \/\/ \u6570\u636e\u7f13\u51b2\u533a
    \n float32_t *voltage_data; \/\/ \u7535\u538b\u91c7\u6837
    \n float32_t *current_data; \/\/ \u7535\u6d41\u539f\u59cb\u91c7\u6837
    \n float32_t *current_aligned; \/\/ \u8865\u507f\u540e\u7535\u6d41<\/p>\n

    \/\/ \u7cfb\u7edf\u53c2\u6570
    \n float32_t system_delay; \/\/ \u6807\u5b9a\u5f97\u5230\u7684\u7cfb\u7edf\u5ef6\u65f6
    \n bool is_calibrated; \/\/ \u6807\u5b9a\u72b6\u6001
    \n bool is_compensated; \/\/ \u8865\u507f\u72b6\u6001<\/p>\n

    \/\/ FFT\u5904\u7406\u5b9e\u4f8b
    \n arm_rfft_fast_instance_f32 fft_instance;
    \n} PowerAnalyzer;<\/p>\n

    \/**
    \n * \u9891\u57df\u65cb\u8f6c\u8865\u507f\u6cd5
    \n * \u539f\u7406：\u901a\u8fc7\u590d\u6570\u4e58\u6cd5\u5728\u9891\u57df\u6d88\u9664\u7cfb\u7edf\u5ef6\u65f6\u5f71\u54cd
    \n * \u6570\u5b66\u57fa\u7840：\u65f6\u57df\u5ef6\u65f6 \u03c4 \u2194 \u9891\u57df\u65cb\u8f6c\u56e0\u5b50 e^{-j2\u03c0f\u03c4}
    \n *\/
    \nbool PowerAnalyzer_Compensate(PowerAnalyzer *analyzer, float32_t *temp_buffer)
    \n{
    \n \/\/ \u53c2\u6570\u68c0\u67e5
    \n if (!analyzer || !analyzer->is_calibrated) return false;<\/p>\n

    \/\/ Step 1: \u65f6\u57df \u2192 \u9891\u57df（\u7535\u6d41\u4fe1\u53f7）
    \n arm_rfft_fast_f32(&analyzer->fft_instance, current_data, fft_buffer, 0);<\/p>\n

    \/\/ Step 2: \u9891\u57df\u76f8\u4f4d\u65cb\u8f6c\u8865\u507f（\u6838\u5fc3\u64cd\u4f5c）
    \n if (fabsf(analyzer->system_delay) > 1e-9f) {
    \n \/\/ \u5b9e\u6570FFT\u7279\u6b8a\u683c\u5f0f\u5904\u7406
    \n \/\/ fft_buffer[0]: DC\u5206\u91cf
    \n \/\/ fft_buffer[1]: \u5948\u594e\u65af\u7279\u9891\u7387
    \n \/\/ fft_buffer[2k], fft_buffer[2k+1]: \u9891\u7387k\u7684\u590d\u6570\u8868\u793a<\/p>\n

    \/\/ \u5904\u7406\u76f4\u6d41\u5206\u91cf（\u4e0d\u9700\u8981\u8865\u507f）
    \n \/\/ fft_buffer[0] \u4fdd\u6301\u4e0d\u53d8<\/p>\n

    \/\/ \u5904\u7406\u5948\u594e\u65af\u7279\u9891\u7387
    \n if (analyzer->fft_size >= 2) {
    \n float32_t nyquist_freq = analyzer->sampling_freq \/ 2.0f;
    \n float32_t phase = 2 * PI * nyquist_freq * analyzer->system_delay;
    \n fft_buffer[1] *= cosf(phase); \/\/ \u53ea\u6709\u5b9e\u90e8
    \n }<\/p>\n

    \/\/ \u5904\u7406\u5176\u4ed6\u9891\u7387\u5206\u91cf
    \n for (uint32_t k = 1; k < analyzer->fft_size\/2; k++) {
    \n float32_t freq = k * analyzer->sampling_freq \/ analyzer->fft_size;
    \n float32_t phase = 2 * PI * freq * analyzer->system_delay;<\/p>\n

    \/\/ \u751f\u6210\u65cb\u8f6c\u56e0\u5b50
    \n float32_t cos_factor = cosf(phase);
    \n float32_t sin_factor = sinf(phase);<\/p>\n

    \/\/ \u590d\u6570\u4e58\u6cd5：I_comp = I_raw * e^{j2\u03c0f\u03c4}
    \n uint32_t idx_re = 2 * k;
    \n uint32_t idx_im = idx_re + 1;<\/p>\n

    float32_t re = fft_buffer[idx_re];
    \n float32_t im = fft_buffer[idx_im];<\/p>\n

    fft_buffer[idx_re] = re * cos_factor – im * sin_factor;
    \n fft_buffer[idx_im] = re * sin_factor + im * cos_factor;
    \n }
    \n }<\/p>\n

    \/\/ Step 3: \u9891\u57df \u2192 \u65f6\u57df（\u83b7\u53d6\u8865\u507f\u540e\u6ce2\u5f62）
    \n arm_rfft_fast_f32(&analyzer->fft_instance, fft_buffer, current_aligned, 1);<\/p>\n

    analyzer->is_compensated = true;
    \n return true;
    \n}<\/p>\n

    \u56db\u3001\u5168\u6ce2\u6709\u529f\u529f\u7387\u7684\u7ec8\u6781\u8ba1\u7b97：\u65f6\u57df\u79ef\u5206\u6cd5<\/h3>\n

    \u901a\u8fc7\u4e0a\u8ff0\u8865\u507f，\u6211\u4eec\u83b7\u5f97\u4e86\u4e0e\u7535\u538b\u6ce2\u5f62\u5728\u65f6\u57df\u4e0a\u4e25\u683c\u5bf9\u9f50\u7684\u7535\u6d41\u5e8f\u5217ialigned[n]\u3002\u57fa\u4e8e\u6b64，\u8ba1\u7b97\u5168\u6ce2\u6709\u529f\u529f\u7387\u6700\u6743\u5a01\u3001\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u56de\u5f52\u5176\u7269\u7406\u5b9a\u4e49\u2014\u2014\u77ac\u65f6\u529f\u7387\u7684\u5e73\u5747\u503c\u3002<\/p>\n

    4.1 \u8ba1\u7b97\u516c\u5f0f<\/h4>\n

    \u5168\u6ce2\u6709\u529f\u529f\u7387\u00a0Ptotal\u7684\u5b9a\u4e49\u662f\u77ac\u65f6\u529f\u7387\u5728\u4e00\u4e2a\u5468\u671f\u5185\u7684\u5e73\u5747\u503c\u3002\u5bf9\u4e8e\u79bb\u6563\u7cfb\u7edf：<\/p>\n

    \"\"<\/p>\n

    \u5176\u4e2d：<\/p>\n

      \n
    • \n

      N \u4e3a\u4e00\u4e2a\u5b8c\u6574\u5468\u671f\u5185\u7684\u91c7\u6837\u70b9\u6570<\/p>\n<\/li>\n

    • \n

      u[n] \u4e3a\u7535\u538b\u91c7\u6837\u5e8f\u5217<\/p>\n<\/li>\n

    • \n

      ialigned[n]\u4e3a\u8865\u507f\u5bf9\u9f50\u540e\u7684\u7535\u6d41\u91c7\u6837\u5e8f\u5217<\/p>\n<\/li>\n<\/ul>\n

      4.2 \u5b8c\u6574\u529f\u7387\u8ba1\u7b97\u5b9e\u73b0<\/h4>\n

      4.3 \u5b8c\u6574\u7684\u529f\u7387\u8ba1\u7b97\u6846\u67b6<\/h4>\n

      \/**
      \n * \u6709\u529f\u529f\u7387\u8ba1\u7b97：\u65f6\u57df\u79ef\u5206\u6cd5
      \n * \u516c\u5f0f：P = (1\/N) * \u03a3(u[n] * i[n])
      \n * \u7279\u70b9：\u7269\u7406\u610f\u4e49\u660e\u786e，\u7cbe\u5ea6\u6700\u9ad8
      \n *\/
      \nvoid PowerAnalyzer_CalculatePower(PowerAnalyzer *analyzer)
      \n{
      \n float32_t sum_ui = 0, sum_u2 = 0, sum_i2 = 0;<\/p>\n

      \/\/ \u9009\u62e9\u7535\u6d41\u6570\u636e\u6e90：\u8865\u507f\u540e\u6216\u539f\u59cb
      \n float32_t *current = analyzer->is_compensated ?
      \n analyzer->current_aligned :
      \n analyzer->current_data;<\/p>\n

      \/\/ \u65f6\u57df\u79ef\u5206\u8ba1\u7b97
      \n for (uint32_t i = 0; i < analyzer->fft_size; i++) {
      \n float32_t u = analyzer->voltage_data[i];
      \n float32_t i_val = current[i];<\/p>\n

      sum_ui += u * i_val; \/\/ \u77ac\u65f6\u529f\u7387\u7d2f\u52a0
      \n sum_u2 += u * u; \/\/ \u7535\u538b\u5e73\u65b9\u7d2f\u52a0
      \n sum_i2 += i_val * i_val; \/\/ \u7535\u6d41\u5e73\u65b9\u7d2f\u52a0
      \n }<\/p>\n

      \/\/ \u8ba1\u7b97\u5404\u53c2\u6570
      \n uint32_t N = analyzer->fft_size;
      \n analyzer->power_active = sum_ui \/ N;
      \n analyzer->voltage_rms = sqrtf(sum_u2 \/ N);
      \n analyzer->current_rms = sqrtf(sum_i2 \/ N);
      \n analyzer->power_apparent = analyzer->voltage_rms * analyzer->current_rms;<\/p>\n

      \/\/ \u529f\u7387\u56e0\u6570\u8ba1\u7b97（\u542b\u4fdd\u62a4\u673a\u5236）
      \n if (analyzer->power_apparent > 1e-6f) {
      \n analyzer->power_factor = analyzer->power_active \/ analyzer->power_apparent;
      \n \/\/ \u9650\u5236\u5728[-1, 1]\u8303\u56f4\u5185
      \n analyzer->power_factor = fmaxf(-1.0f, fminf(1.0f, analyzer->power_factor));
      \n }
      \n}<\/p>\n

      \u4e94\u3001\u603b\u7ed3\u4e0e\u5c55\u671b<\/h3>\n

      \u81f3\u6b64，\u6211\u4eec\u5b8c\u6210\u4e86\u9ad8\u7cbe\u5ea6\u4ea4\u6d41\u8ba1\u91cf\u7cfb\u7edf\u7684\u95ed\u73af\u6784\u5efa：<\/p>\n

    • \n

      \u7cbe\u786e\u6d4b\u91cf：\u901a\u8fc7FFT\u9891\u8c31\u5206\u6790，\u7cbe\u786e\u6355\u83b7\u7535\u538b\u4e0e\u7535\u6d41\u4e4b\u95f4\u7684\u539f\u59cb\u76f8\u4f4d\u5dee\u3002<\/p>\n<\/li>\n

    • \n

      \u7cfb\u7edf\u6807\u5b9a：\u4f7f\u7528\u7eaf\u963b\u6027\u8d1f\u8f7d\u5efa\u7acb"\u96f6\u76f8\u4f4d\u5dee"\u57fa\u51c6，\u91cf\u5316\u7cfb\u7edf\u56fa\u6709\u5ef6\u65f6\u3002<\/p>\n<\/li>\n

    • \n

      \u667a\u80fd\u8865\u507f：\u5728\u9891\u57df\u6267\u884c\u76f8\u4f4d\u65cb\u8f6c，\u6d88\u9664\u7cfb\u7edf\u8bef\u5dee，\u91cd\u5efa\u7eaf\u51c0\u7684\u8d1f\u8f7d\u7535\u6d41\u4fe1\u53f7\u3002<\/p>\n<\/li>\n

    • \n

      \u6743\u5a01\u8ba1\u7b97：\u57fa\u4e8e\u65f6\u57df\u79ef\u5206\u6cd5，\u8ba1\u7b97\u5f97\u5230\u51c6\u786e\u7684\u6709\u529f\u529f\u7387\u548c\u80fd\u91cf\u503c\u3002<\/p>\n<\/li>\n","protected":false},"excerpt":{"rendered":"

      \u5f15\u8a00：\u4ece\u95ee\u9898\u5230\u89e3\u51b3\u65b9\u6848\u7684\u8de8\u8d8a\u5728\u4e0a\u4e00\u7bc7\u7684\u63a2\u7d22\u4e2d，\u6211\u4eec\u63ed\u793a\u4e86\u7406\u60f3\u529f\u7387\u6a21\u578b\u7684\u8106\u5f31\u6027：\u9762\u5bf9\u4e00\u4e2a\u7b80\u5355\u7684\u53f0\u5f0f\u98ce\u6247（\u611f\u6027\u8d1f\u8f7d），\u57fa\u4e8e P U\u1d63\u2098\u209b \u00d7 I\u1d63\u2098\u209b \u7684\u8ba1\u7b97\u7ed3\u679c\u7adf\u663e\u8457\u504f\u79bb\u771f\u5b9e\u503c\u3002\u6211\u4eec\u8ba4\u8bc6\u5230，\u5176\u6839\u6e90\u5728\u4e8e\u7535\u538b\u4e0e\u7535\u6d41\u6ce2\u5f62\u4e4b\u95f4\u5b58\u5728\u7684\u76f8\u4f4d\u5dee（\u03c6）\u3002\u7136\u800c，\u66f4\u6df1\u5165\u7684\u5256\u6790\u5e26\u6765\u4e86\u66f4\u4e25\u5cfb\u7684\u6311\u6218：\u6211\u4eec\u901a\u8fc7ADC\u91c7\u6837\u76f4\u63a5\u83b7\u5f97\u7684\\”\u76f8\u4f4d\u5dee\\”&#xff0<\/p>\n","protected":false},"author":2,"featured_media":62052,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[50],"topic":[],"class_list":["post-62062","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-50"],"yoast_head":"\n\u300a\u5f81\u670d\u76f8\u4f4d\u5dee\uff1a\u57fa\u4e8eFFT\u6807\u5b9a\u4e0e\u6570\u5b57\u8865\u507f\u7684\u9ad8\u7cbe\u5ea6\u8ba1\u91cf\u5b9e\u73b0\u300b - 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